A new study from <a href="https://www.osu.edu/">Ohio State University</a> reveals what is going on inside of your <a href="https://www.earth.com/news/gut-brain-interactions-have-an-influence-on-diseases/">brain</a> when you get lost in a fictional fantasy. The experts discovered that the more immersed we become in the lives of our favorite characters of fiction, the more our brain activity reflects how much we identify with them.
&#8220;When they think about a favorite fictional character, it appears similar in one part of the brain as when they are thinking about themselves,&#8221; said study lead author Timothy Broom.
The research was focused on self-described fans of the HBO series &#8220;Game of Thrones.&#8221; The individuals were instructed to think about themselves, nine of their friends, and nine characters from the drama series. The participants also reported on which character they felt closest to and liked the most.
According to Broom, Game of Thrones was ideal for this study because it attracted a devoted fan base and the large cast presented a variety of characters that people could become attached to.
One of the key findings involved participants who scored highest on &#8220;trait identification.&#8221; These individuals agreed most strongly with statements like &#8220;I really get involved in the feelings of the characters in a novel.&#8221;
&#8220;People who are high in trait identification not only get absorbed into a story, they also are really absorbed into a particular character,&#8221; said Broom. &#8220;They report matching the thoughts of the character, they are thinking what the character is thinking, they are feeling what the character is feeling. They are inhabiting the role of that character.&#8221;
The researchers used an fMRI machine to measure activity in various parts of the brain through small changes in blood flow. As the participants&#8217; brains were scanned, they were evaluating themselves, their friends, and Game of Thrones characters. 
A part of the brain called the ventral medial prefrontal cortex (vMPFC) is known to show increased activity when people think about themselves and, to a lesser extent, when they think about close friends.
While in the fMRI, the individuals were shown a series of names &#8211; including themselves, friends, or characters &#8211; along with a trait, such as lonely, sad, trustworthy, or smart. The participants simply said &#8220;yes&#8221; or &#8220;no&#8221; to imply whether the trait fit the person.
As expected, the vMPFC was most active when people were evaluating themselves, less active when they evaluated friends, and least active when they evaluated characters from Game of Thrones.
However, among those who were high in trait identification, the vMPFC was more active when they thought about the fictional characters than it was for participants who identified less with the characters. This region of the brain was particularly active when the individuals evaluated the character they identified with the most.
Study co-author Dylan Wanger said the findings help explain how fiction can have such a big impact on some people.
&#8220;For some people, fiction is a chance to take on new identities, to see worlds though others&#8217; eyes and return from those experiences changed,&#8221; said Wagner.
&#8220;What previous studies have found is that when people experience stories as if they were one of the characters, a connection is made with that character, and the character becomes intwined with the self. In our study, we see evidence of that in their brains.&#8221;
The study is published in the journal <a href="https://academic.oup.com/scan">Social Cognitive and Affective Neuroscience</a>.
&#8211;&#8212;
By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

What happens in your brain while you're lost in fiction

The evolution of our <a href="https://www.earth.com/news/dozens-of-free-floating-planets-found-in-the-milky-way/">planet</a> is a story of gradual cooling. While 4.5 billion years ago, extreme temperatures and a deep ocean of magma prevailed on the surface of the Earth, the planet’s surface shifted to a cooling phase over the next millions of years that formed a brittle crust. However, the immense thermal energy emanating from the Earth’s core set various dynamic processes in motion, such as plate tectonics, volcanism, and mantle convection.



There is still no scientific consensus regarding how fast the Earth has cooled, or how long it will take until the heat-related dynamic processes mentioned above will stop due to cooling. By investigating the thermal conductivity of the minerals which form the boundary between the Earth’s core and mantle, a research team led by <a href="https://ethz.ch/en.html">ETH Zürich</a> has found that the Earth may in fact be cooling much faster than initially estimated.



Studying this boundary layer, formed mainly of a mineral called bridgmanite, is important since it is the place where the viscous rock of the Earth’s mantle is in direct contact with the hot iron-nickel melt of its outer core, causing significant heat flow.



The scientists used a recently developed optical absorption measurement system in a diamond unit heated with a pulse laser in order to measure the thermal conductivity of bridgmanite in the laboratory, under the pressure and temperatures prevailing inside the Earth.



“This measurement system let us show that the thermal conductivity of bridgmanite is about 1.5 times higher than assumed,” reported study lead author Motohiko Murakami, a specialist in Earth Sciences at ETH Zürich. This finding suggests that the heat flow from the Earth’s core into the mantle is higher than estimated, a phenomenon which increases mantle convection and accelerates the cooling of the Earth.



Moreover, Murakami and his colleagues also discovered that rapid cooling of the mantle will turn bridgmanite into the mineral post-perovskite which, once predominant, will further accelerate the cooling of the mantle due to its higher efficiency in conducting heat.



“Our results could give us a new perspective on the evolution of the Earth’s dynamics. They suggest that Earth, like the other rocky planets Mercury and Mars, is cooling and becoming inactive much faster than expected,” Murakami explained.



Further research is needed to find out how long it will take for convection currents in the mantle to stop. &nbsp;“We still don’t know enough about these kinds of events to pin down their timing,” concluded Murakami.



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/pii/S0012821X21005859?via%3Dihub#!">Earth and Planetary Science Letters</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Earth’s interior is cooling faster than previously thought

The evolution of our planet is a story of gradual...

After rising more than twentyfold in December due to the spread of the highly-contagious <a href="https://www.earth.com/news/did-the-omicron-variant-jump-to-humans-from-mice/">Omicron</a> variant, the number of <a href="https://www.earth.com/news/covid-19-can-prompt-the-creation-of-self-attacking-antibodies/">Covid-19</a> cases in New York City appears to start flattening. In other major cities first hit by the Omicron wave, such as Washington D.C., Newark, Cleveland, New Jersey, Maryland and Boston, case numbers have already started to decrease. The news offers hope to Americans that the Omicron wave may have started to peak and the infections will soon drop rapidly.



This pattern of fast rise and fall of Omicron cases was already noticed a few weeks ago in the case of the variant’s first epicenter, <a href="https://www.washingtonpost.com/world/2021/12/31/south-africa-omicron-coronavirus-peak/">South Africa</a>, and more recently in other countries such as the <a href="https://www.wsj.com/articles/omicron-peak-appears-to-have-passed-in-u-k-offering-hope-the-wave-is-receding-11642078349">United Kingdom.</a> The decline in hospitalizations and deaths in South Africa and the current flattening of the number of severe cases in certain European countries increases hope that Omicron’s toll may turn out to be less than Delta’s.



However, the situation in the United States appears more worrisome than in these other countries. With hospitalization numbers reaching all-time <a href="https://www.reuters.com/world/us/us-breaks-covid-19-hospitalization-record-omicron-surges-2022-01-10/">records</a> and deaths averaging over 1,800 per day in the past week (a 50 percent increase over the past&nbsp; two weeks), the U.S. is “very far from being out if the woods,” as Dr. Bruce Vanderhoff, the director of the <a href="https://odh.ohio.gov/wps/portal/gov/odh/home">Ohio Department of Health</a>, put it.&nbsp;



“If we’ve learned one thing about Covid it’s that it is extraordinarily unpredictable. And things can change dramatically and quickly,” he added.



Even if U.S.’s new case numbers have already peaked and the country will follow the same pattern of rapid descent as places where the Omicron wave has already peaked and is now falling sharply, rises in hospitalizations and deaths are still expected for a few more weeks, possibly even until mid-February. Moreover, U.S.’s rather low vaccine uptake (63 percent) leaves a large part of the population susceptible to more severe forms of illness.



However, the hope that Omicron may be a <a href="https://www.nytimes.com/2022/01/14/world/europe/uk-omicron-coronavirus-pandemic.html">turning point</a> in the pandemic - by offering a large amount of herd immunity at a bearable cost, due to high transmissibility but inherent mildness - increases in many places all over the world, with several countries in Europe starting to treat the variant more like the common flu, and let it become an inescapable, yet less dangerous part of our daily lives.



“At some point, we’ll be able to draw a line — and Omicron may be that point — where we transition from what is a catastrophic global threat to something that’s a much more manageable disease,” said Lauren Ancel Meyers, a professor of Integrative Biology and Statistics at the <a href="https://www.utexas.edu/">University of Texas</a>.



Yet, many public health experts are warning that it is too early to make this call. In a recent plea published in the <a href="https://www.bmj.com/content/376/bmj.o90">British Medical Journal</a>, an international team of scientists argued that there is still an urgent need to “reduce infections to avoid overwhelming health systems and protect public life and the economy.”



“Even under the most optimistic assumptions, letting Omicron run unfettered risks potentially devastating consequences,” they warned.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Omicron is starting to peak in the United States

After rising more than twentyfold in December due to the...

A new study led by the <a href="https://higgs.ph.ed.ac.uk/">Higgs Center for Theoretical Physics</a> in the United Kingdom has found that bacteria may have traveled from <a href="https://www.earth.com/news/scientists-shed-new-light-on-the-origins-of-life-on-earth/">Earth</a> into space after being blown into the atmosphere by high-speed vertical winds. The scientists estimate that particles the size of bacteria can be pushed at least 90 miles into the atmosphere by strong winds, and then carried further by hyper-fast space dust.&nbsp;



Researchers had previously estimated that the biosphere (the area of the Earth containing life) extends up to only 50 miles, but recent discoveries of terrestrial bacteria on the <a href="https://www.nasa.gov/mission_pages/station/main/index.html">International Space Station</a> (ISS) show that life can be found even 250 miles above the Earth’s surface.&nbsp;



According to study lead author Arjun Berera, a researcher at the Higgs Center, vertical winds blowing at up to 335 miles per hour, especially during geomagnetic storms near the poles, could have transported these bacteria into outer space.



“The cases in our paper did not show particles could reach quite as high at 150 km [90 miles], but we think it presents plausible evidence that this is possible, but more data and understanding of vertical winds is still needed,” said Professor Berera.



“Our estimates using reported observations of large vertical winds show that it is conceivable for such particles to be projected from near the highest measured altitudes in the mesosphere up to 120 km,” the study authors added. At this point, the particles have “enough momentum to facilitate the planetary escape.”



According to the scientists, these phenomena could help seed life on other planets, such as Mars. “If a biological particle escaped Earth and it landed on something that was conducive to life, biology tends to grow quite easily. Even if the probability of an escape event happening is quite low, like once every 50 years, if you think about long geological timescales there are a lot of events of potential life transfer that could happen from this mechanism,” explained Berera.



Moreover, these findings could also suggest that life on Earth may have originated through transfer of microorganisms from other planets (the so-called “<a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/panspermia">panspermia theory</a>”). &nbsp;“It is possible if there were say biological particles in early Mars, that they may have been propelled into space and possibly landed on Earth,” Berera said.&nbsp;



Further research is needed to understand what distances can micro-organism travel through space, and what are the factors that influence their journey.



The study is published in the journal <a href="https://royalsocietypublishing.org/doi/10.1098/rspa.2021.0626">Proceedings of the Royal Society A</a>.&nbsp;



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Life on Earth may have blown in from outer space

A new study led by the Higgs Center for Theoretical...

During the last year, people spent an average of 4.8 hours per day on their smartphones, thus nearly a third of their waking hours. Globally, consumers spent 3.8 trillion hours on mobile phones, paid $320,000 on apps every minute, and downloaded over 435,000 <a href="https://www.earth.com/news/health-exercise-apps-teens/">apps</a> per minute. These statistics are detailed in a new <a href="https://www.appannie.com/en/insights/market-data/state-of-mobile-2022/">report</a> from <a href="https://www.appannie.com/en/">App Annie</a>, the “State of Mobile in 2022."



By analyzing a vast amount of data, including downloads, consumer spending, and usage estimates, the App Annie company - a leading global provider of mobile data and analytics - has found that smartphones may be the leading technology of the present.



“Mobile is the greatest of all time and the go-to device of the future,' said Theodore Krantz, CEO of App Annie. “The big screen is slowly dying as mobile continues to break records in virtually every category – time spent, downloads and revenue.”



“Despite access to bigger screens, consumers are still watching content on mobile. Competition is heating up in the space and exclusive content is a way of drawing in new viewers.”&nbsp;



The data revealed that, globally, consumers spent $170 billion on apps (up to 19 percent from 2020), while app downloads have continued increasing at five percent each year, reaching a record of 230 billion in 2021. 



The greatest increases were seen in consumer spending on dating apps ($4.2 billion, marking a 55 percent increase from 2019), followed closely by food and drink apps, with a 50 percent yearly increase. Online advertising is also surging, topping $295 billion in 2021 (a 23 percent increase), and heading toward $350 billion within a year.&nbsp;



In terms of user engagement, TikTok, a newly established Chinese social media app, was the standout winner, ahead of previous leaders such as Facebook, Instagram, or WhatsApp. While TikTok and Facebook both registered 19.6 average monthly hours per user in 2021, TikTok witnessed an extraordinary growth, from only 13.3 average monthly hours in 2020.



“2021 was another blockbuster year in mobile, following a pandemic-induced catalyst to mobile habits in 2020. 2022 is set to blow past records in a transformed economy reliant on digital socialization, hybrid work, and entertainment from the palm of your hand. A mobile-first strategy is a prerequisite for success in our transformed economy,” App Annie said.



However, whether we should be as optimistic as this company regarding such life-changing transformations remains an open question. Research into smartphone technology should also take into account their negative impacts, such as the diminished need for real-life interaction, disruption of sleeping patterns, and the emergence or exacerbation of mental disorders, such as ADHD, depression, or anxiety.



&nbsp;---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

People spend nearly 5 hours a day on smartphones

During the last year, people spent an average of 4.8...

In a new study from the <a href="https://www.uc.edu/">University of Cincinnati</a>, researchers have discovered that a type of brightly colored jumping spider is <a href="https://www.earth.com/news/dinosaurs-may-have-had-pops-of-color-like-modern-ducks/">color</a> blind. The study was focused on Saitis barbipes, a common jumping spider found in Europe and North Africa. 



The males of this species have a furry red crown and legs. They are known for performing elaborate courtship dances.



“We assumed they were using color for communication. But we didn’t know if their visual system even allowed them to see those colors,” said study co-first author David Outomuro.



Using microspectrophotometry to examine jumping spiders collected in Slovenia, the team found no evidence of a red photoreceptor. The experts also looked for colored filters that might shift green sensitivity to red, but found that there were none.



The researchers ultimately determined that, most likely, bright red colors appear no different than black markings to these jumping spiders.



"To quantify and visualize whether females may nevertheless be capable of discriminating red from black color patches, we take multispectral images of males and calculate photoreceptor excitations and color contrasts between color patches," explained the study authors&nbsp;&nbsp;



"Red patches would be, at best, barely discriminable from black, and not discriminable from a low-luminance green."



“It’s a bit of a head-scratcher, what’s going on here,” said study co-author Professor Nathan Morehouse. “We haven’t solved the mystery of what the red is doing.”&nbsp;



Even though animals use color in all sorts of ways, including camouflage, it’s not always apparent what bright colors might signify, according to Professor Morehouse. “We spent a lot of time talking about it as a group. What else could it be? I feel there’s an interesting story behind the mystery."



Study senior author Cynthia Tedore, a research associate at the University of Hamburg, said the results of the research were surprising.



“Males have bold red and black coloration on their forward-facing body surfaces which they display during their courtship dances; whereas, females lack red coloration altogether. This initially suggested to us that the red color must play some role in mate attraction," said Tedore.



“Instead, we found that red and black are perceived equivalently, or nearly so, by these spiders and that if red is perceived as different from black, it is perceived as a dark ‘spider green’ rather than red."



The researchers believe that the spider’s red and black colors may possibly improve defensive camouflage.



“For predators with red vision, at natural viewing distances, the spider's red and black color patches should blur together to become an intermediate orangish-brownish color, which would help the spider blend in with its leaf litter habitat better than all-black coloration would,” said Tedore.



The experts noted that there are many colorful jumping spiders that see red perfectly well. There are also many dull-colored spiders that have great color vision.



The study is published in the journal <a href="https://www.springer.com/journal/114">The Science of Nature</a>.



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Scientists find a colorful jumping spider that is color blind

In a new study from the University of Cincinnati, researchers...

New research led by <a href="https://newbrunswick.rutgers.edu/">Rutgers University – New Brunswick</a> and funded by <a href="https://www.nasa.gov/">NASA</a> has discovered the structures of proteins that might have been responsible for the origins of life from the “primordial soup” of chemical elements of ancient <a href="https://www.earth.com/video/earth-humans-and-all-living-creatures-are-made-from-stars/">Earth</a>. By investigating how primitive forms of life on our planet originated from simple, non-living materials, scientists finally managed to address one of the mysteries of modern biology.



“We have very little information about how life arose on this planet, and our work contributes a previously unavailable explanation,” said study lead author Yana Bromberg, a professor of Microbiology and Bioinformatics at Rutgers.&nbsp;



According to Professor Bromberg and her colleagues, all living organism would have needed to collect and store energy from sources such as the Sun or hydrothermal <a href="https://www.earth.com/news/deep-sea-vents-are-favorable-to-the-formation-of-life/">vents</a>. In molecular terms, this would entail the ability to shuffle electrons. And since the best elements for electron transfers are metals and most activities connected to life are carried out by proteins, the researchers decided to investigate proteins that bind metals as potential precursors to living organisms.



By applying advanced computational methods, the scientists found that the majority of metal-binding proteins are similar regardless of the type of metals they bind to, the organism they come from, or their overall functionality.&nbsp;



“We saw that the metal-binding cores of existing proteins are indeed similar even though the proteins themselves may not be. We also saw that these metal-binding cores are often made up of repeated substructures, kind of like LEGO blocks,” explained Professor Bromberg. &nbsp;&nbsp;



“Curiously, these blocks were also found in other regions of the proteins, not just metal-binding cores, and in many other proteins that were not considered in our study. Our observation suggests that rearrangements of these little building blocks may have had a single or a small number of common ancestors and given rise to the whole range of proteins and their functions that are currently available - that is, to life as we know it.”&nbsp;



“This explanation could also potentially contribute to our search for life on other planets and planetary bodies. Our finding of the specific structural building blocks is also possibly relevant for synthetic biology efforts, where scientists aim to construct specifically active proteins anew,” she concluded.



The study is published in the journal <a href="https://www.science.org/journal/sciadv">Science Advances</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Study sheds new light on the origins of life on Earth

New research led by Rutgers University – New Brunswick and...

Dramatic,Spring,Scene,On,The,Tulip,Farm.,Colorful,Sunset,In

Body image refers to your perceptions about your own body, and whether you feel positive or negative about it. It is a complex phenomenon that is based on your attitudes, experiences and beliefs in relation to your own physical appearance and its attractiveness. This is influenced by social and <a href="https://www.earth.com/news/children-respond-to-rulebreakers-in-culturally-distinct-ways/">cultural</a> factors as well.&nbsp;



People with a negative body image feel that they will be judged for being unattractive, or for being less attractive than they should be. This can cause them anxiety, low self-esteem and a failure to value themselves, and may contribute to mental health issues. Many people employ coping strategies to manage their potentially distressing body-image experiences; these may include avoiding social situations in which they may be judged, and covering up parts of their bodies that they feel are “unacceptable” to others.&nbsp;



Growing evidence suggests that spending time in natural environments is associated with the development of a more positive body image and that this may also represent a way of coping with, or improving a person’s negative body image. Thus far, however, the mechanism by which exposure to nature helps improve body image has not been elucidated.&nbsp;



In new research, published recently in the journal <a href="https://home.liebertpub.com/publications/ecopsychology/300/overview">Ecopsychology </a>, scientists from the Anglia Ruskin University in the UK investigated a possible indirect pathway whereby time spent in nature is associated with increased body appreciation.&nbsp;



For the study, 401 participants were asked to complete a survey about their exposure to nature, their levels of body appreciation and the extent to which they use “positive rational acceptance” (PRA) as a coping mechanism. PRA is a cognitive approach that can be used to help avoid the stress induced by having a negative body image. It entails using strategies that emphasize acceptance of one’s physical appearance, along with positive self-care and rational self-talk about one's body.&nbsp;



The researchers used correlation analyses to find out whether the three variables were associated with one another. The analyses&nbsp;indicated positive, although weak-to-moderate, associations between all three constructs. This held true when all participants were lumped together, as well as when men and women were considered separately.



Furthermore, mediation analysis supported the hypothesis that PRA mediates the association between nature exposure and body appreciation. This implies that when people are exposed to nature, they are better at rationalizing and keeping in perspective any feelings of negative body image they may have. The results highlight the potential benefit of exposure to nature in terms of promoting adaptive body image coping strategies which, in turn, are associated with a more positive body image.



Although previous research has demonstrated the mental and emotional benefits of spending time in natural environments, this is the first study to suggest a mechanism whereby exposure to nature can help the mind cope with temporary feelings of negative body image. The authors state that spending time in natural environments provides opportunities for healthy body image coping strategies to develop and be employed.&nbsp;



This may be due, in part, to the fact that natural settings are away from the physical sources of body image threats, such as unrealistic appearance standards, mirrors, or social media. Being in nature may also help individuals focus on healthier and more rational thought processes that allow for more realistic appraisals of the value of their own bodies.



Lead author Viren Swami, Professor of Social Psychology at Anglia Ruskin University, said: “There is already evidence that being in nature in itself promotes positive body image, but this is the first study to look at how exposure to nature can help the mind cope with temporary feelings of negative body image that we all experience from time to time, and keep a sense of perspective.”



“Being in nature takes us away from some of the triggers for negative body image – Instagram posts, models on billboards, mirrors – that we find in urban environments, and gives us opportunities to put things into perspective. The restorative qualities of these natural environments may also promote healthier cognitive processes, including greater self-control and a feeling of time passing more slowly, giving us the chance to rationalize these threats,” explained Swami.



“We know that positive body image boosts mental health, and this study adds weight to the growing body of evidence about the importance of exposure to nature, and how we need to ensure, as a society, that everyone has as much access to natural environments as possible."



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Spending time in nature leads to a healthier body image

Body image refers to your perceptions about your own body,...

A new study led by <a href="https://www.tcd.ie/">Trinity College Dublin</a> has found that forgetting may be an important functional feature of the brain, allowing it to interact dynamically with the environment, and could ultimately be understood as a form of learning.



As we live our lives, we create an enormous number of memories, most of which we forget. While forgetting has usually been understood in negative terms, as a weakness of our cognitive system, a research team from Trinity College Dublin discovered that forgetting some memories could in fact be beneficial, as it can lead to more flexible behavior and better decision-making.&nbsp;



According to the scientists, if certain memories were gained in circumstances that are not fully relevant to the current environment, forgetting them may well be a positive thing, improving our well-being. In other words, we learn to forget some memories, while retaining others that are more important to our current situation.



“Memories are stored in ensembles of neurons called ‘engram cells,’ and successful recall of these memories involves the reactivation of these ensembles. The logical extension of this is that forgetting occurs when engram cells cannot be reactivated. The memories themselves are still there, but if the specific ensembles cannot be activated, they can’t be recalled. It’s as if the memories are stored in a safe but you can’t remember the code to unlock it,” explained study lead author Dr. Tomás Ryan, an associated professor of Biochemistry at Trinity College Dublin.



“Our new theory proposes that forgetting is due to circuit remodeling that switches engram cells from an accessible to an inaccessible state. Because the rate of forgetting is impacted by environmental conditions, we propose that forgetting is actually a form of learning that alters memory accessibility in line with the environment and how predictable it is.”



Thus, according to Professor Ryan and his colleagues, forgetting is due to altered memory access rather than memory loss. This important insight could have a significant impact in explaining not only the structure of memory in general but also pathological conditions related to memory loss, such as <a href="https://www.earth.com/news/drinking-coffee-protects-against-alzheimers-disease/">Alzheimer</a>’s disease.



“We believe that this ‘natural forgetting’ is reversible in certain circumstances, and that in disease states – such as in people living with Alzheimer’s disease for example – these natural forgetting mechanisms are hijacked, which results in greatly reduced engram cell accessibility and pathological memory loss,” wrote the authors.



The study is published in the journal <a href="https://www.nature.com/articles/s41583-021-00548-3">Nature Reviews Neuroscience</a>.&nbsp;



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Forgetting may actually be a form of learning

A new study led by Trinity College Dublin has found...

A new study from <a href="https://www.anu.edu.au/">Australian National University</a> (ANU) creates a stark choice: step up conservation efforts or lose the regent honeyeater, a beautiful <a href="https://www.earth.com/news/songbirds-and-humans-use-similar-speech-patterns/">songbird</a>, within 20 years. The new study reveals that even the current intensive conservation efforts aren’t enough.



“The regent honeyeater population has been decimated by the loss of over 90 per cent of their preferred woodland habitats,” said study lead author Professor Rob Heinsohn.



"Less than 80 years ago, it was one of the most commonly encountered species, ranging from Adelaide to Rockhampton. Now it is on track to follow the dodo into extinction.”



There are currently less than 300 regent honeyeaters left, making it one of Australia’s rarest birds. Habitat destruction forces the remaining honeyeaters to compete with larger birds for less habitat.



In 2015 the ANU researchers began an intensive research project focused on gaining greater understanding of the regent honeyeater’s decline. After years of field work, the scientists discovered that the decline in nest success was due to predation by other bird species and possums.&nbsp;



In the new research, the scientists used their hard won field data to create a population model that predicts the bird’s future population.&nbsp;



“Our models show that current conservation efforts have provided essential life support for the regent honeyeaters, but do not go far enough," said study co-author Dr. Ross Crates. “We were able to isolate the three key conservation priorities necessary to secure the birds’ future."&nbsp;



The first conservation priority the research lays out is a doubling of nest success rates in both wild and zoo bred animals, facilitated by protecting the nests from predators.&nbsp;



Next captive breeding efforts releasing birds into the Blue Mountains must increase and remain steady for twenty years in addition to nest protection.&nbsp;



Lastly, the research emphasizes that the regent honeyeater can only survive into the future if more habitat is preserved and restored.&nbsp;



“Without more habitat, reintroductions and nest protection efforts will be futile, because the flock sizes will never reach the critical mass needed for the birds to breed safely without our protection," said Professor Heinsohn.&nbsp;&nbsp;



"Our study provides both hope and a dire warning - we can save these birds, but it will take a lot of effort and resources over a long time to pull it off.”&nbsp;



The study is published in the journal <a href="https://www.journals.elsevier.com/biological-conservation">Biological Conservation</a>.



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By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

How can we save the regent honeyeater from extinction?

A new study from Australian National University (ANU) creates a...

A new study led by scientists from the <a href="https://www.exeter.ac.uk/">University of Exeter</a> has found an increase in the diversity of <a href="https://www.earth.com/news/bacteria-can-help-sustainably-extract-rare-earth-elements/">bacteria</a> in the genus Vibrio in UK waters. Scientists discovered V. rotiferianus and V. jasicida, two species that have never been detected in the waste of this region before.&nbsp;



The increase in diversity of Vibrio bacteria may harm sea creatures such as shellfish, and can also be harmful to humans.&nbsp;&nbsp;&nbsp;&nbsp;



"Vibrio species can often be found in UK waters in summer, when temperatures are more favourable for them," said <a href="https://biosciences.exeter.ac.uk/staff/profile/index.php?web_id=sariqa_wagley">Dr. Sariqa Wagley</a>. "With sea-surface temperatures rising due to climate change, Vibrio activity in the waters is more common, and the diversity of Vibrio species is now increasing. We found Vibrio parahaemolyticus – the leading cause of seafood-borne gastroenteritis worldwide – at Chichester Harbour."Despite the potential health concerns, Dr. Wagley points out that there are easy ways to avoid sickness, even with the spread of bacteria from food.&nbsp;



"It is important to note that thorough cooking kills harmful Vibrio bacteria in seafood. However, increasing abundance and diversity of Vibrio bacteria creates health risks not only for people eating seafood, but for those using the sea for recreation purposes – either due to swallowing infected seawater or from the bacteria entering exposed wounds or cuts.”



Besides their direct impact on human health, Vibrio bacteria have significant indirect impacts, including harm to the shellfish industry.&nbsp;



"Vibrio bacteria are also a threat to a variety of marine species including shellfish themselves. Disease costs the global aquaculture industry £6 billion a year, and this burden of disease can be devastating," said Dr. Wagley.



"We have not seen mass mortality of shellfish due to Vibrio bacteria here in the UK yet, but this has occurred elsewhere – including in France and Australia."



The research highlights the need for careful monitoring of the situation, both for human health as well as marine biodiversity.&nbsp;



The study is published in the journal <a href="https://www.journals.elsevier.com/water-research">Water Research</a>.



Image Credit: Dr. Luke Helmer



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By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

New bacteria found in the UK linked to warming waters

A new study led by scientists from the University of...

According to current scientific knowledge, the history of life on Earth was marked until now by five mass <a href="https://www.earth.com/news/volcanic-fertilization-led-to-severe-mass-extinction-event/">extinctions</a>, which were caused by natural phenomena and resulted in great global losses of biodiversity. In a new study, a group of biologists from <a href="https://manoa.hawaii.edu/">University of Hawai‘i at Mānoa</a> and the <a href="https://www.mnhn.fr/en">National Museum of Natural History</a> in Paris, France, argue that we are currently experiencing a Sixth Mass Extinction which, in contrast to the previous ones, is caused entirely by human activities.



By extrapolating from estimates obtained through the analysis of snail and slug populations, the scientists have shown that, since 1500, the Earth could have lost between 7.5 percent and 13 percent of the approximately two million of known species, thus between 150,000 to 260,000 species.



“Drastically increased rates of species extinctions and declining abundances of many animal and plant populations are well documented, yet some deny that these phenomena amount to mass extinction,” said&nbsp;study lead author Robert Cowie, a research professor of Biosciences at the University of Hawai’i.



“This denial is based on a biased view of the crisis which focuses on mammals and birds and ignores invertebrates, which of course constitute the great majority of biodiversity. Including invertebrates was key to confirming that we are indeed witnessing the onset of the Sixth Mass Extinction in Earth’s history.”



According to Professor Cowie and his colleagues, the situation is not the same everywhere on Earth. Although increasingly more marine species are threatened, the crisis affecting the seas and oceans is not so severe as that impacting the land. Moreover, on land, island species are more affected than continental ones, and a much larger number of terrestrial animals are endangered in comparison to plants.



Unfortunately, this ongoing extinction is denied by most of the people, including key political actors and policy-makers, and while conservation initiatives have been successful for certain charismatic animals, they cannot target all endangered species and reverse the overall thread of extinction.



“Despite the rhetoric about the gravity of the crisis, and although remedial solutions exist and are brought to the attention of decision-makers, it is clear that political will is lacking,” said Professor Cowie. “Denying the crisis, accepting it without reacting, or even encouraging it constitutes an abrogation of humanity’s common responsibility and paves the way for Earth to continue on its sad trajectory towards a Sixth Mass Extinction.”



The study is published in the journal <a href="https://onlinelibrary.wiley.com/doi/10.1111/brv.12816">Biological Reviews</a>.&nbsp;&nbsp;&nbsp;



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

The Sixth Mass Extinction is currently in progress

According to current scientific knowledge, the history of life on...

When wild creatures gather at watering holes, they also bring along their parasites, according to a new study from <a href="https://www.ucsb.edu/">UC Santa Barbara</a>. The experts report that cattle and elephants have the highest increased risk of exposure to the <a href="https://www.earth.com/news/if-primates-go-extinct-so-will-their-parasites/">parasites</a>.&nbsp;



"We think about watering holes as being iconic centers of these majestic animals, but they are also hotspots for the parasites that infect these animals," said study co-author Georgia Titcomb.&nbsp;



The researchers set out to investigate how watering holes may influence the distribution of the parasites across savannas in central Kenya.&nbsp;



The study revealed that parasite density is much higher around water sources compared to the surrounding landscape. The exposure risk varied among animal species, and the results suggest that cattle and elephants have by far the greatest risk. In fact, potential parasite exposure for cattle was 143 times higher, and 67 times higher for elephants.&nbsp;



Titcomb said she expected watering holes to aggregate parasites, leading to higher exposure for hosts. "But we didn't expect quite the degree of variation among different wildlife species. The animals that were most strongly affected, and that really followed our expectations, were ones that are quite water dependent: elephants and cattle."



The researchers also surveyed 17 watering holes and 17 dry locations at the Mpala Research Centre, in central Kenya, as well as three wet and dry sites at Ol Pejeta Conservancy. The team found that in the driest areas and time periods, parasite density around water sources was more than 150 times higher than that of locations without water.



"If a cattle herder wants to reduce the chances that their cattle are exposed to parasites, they may want to avoid grazing their animals within 150 meters of water," said Titcomb.&nbsp;



Next, she hopes to investigate how parasite infections in cattle might affect wildlife. "Because cattle are so numerous, their infection patterns have really strong potential to affect less numerous wildlife in the area."



The study is published in the journal <a href="https://www.nature.com/ncomms/">Nature Communications</a>.



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

When animals flock to watering holes, so do their parasites

When wild creatures gather at watering holes, they also bring...

In the past, when climates changed, forests became distributed more to the north or to the south of their previous locations. This is not to say that the trees, themselves, moved. Rather, the ranges of the tree species changed. For example, fossil plant and pollen records show that the ranges of tree species shifted northward at a rate of 50km per century as the climate warmed after the retreat of the North American ice cap.&nbsp;



Tree range migration is facilitated by the movement of seeds. When the climate changes, trees begin to form more seeds; these get spread around by dispersal agents and may germinate in areas that are more favorable for growth. Although wind and water may carry some seeds, the vast majority of trees depend on animals to disperse them to new areas. But now, many of these seed-dispersing animals are themselves threatened, as climate changes and habitats are lost.



In&nbsp;<a href="http://www.science.org/doi/10.1126/science.abk3510?adobe_mc=MCMID%3D84587913426847399401258317155412422308%7CMCORGID%3D242B6472541199F70A4C98A6%2540AdobeOrg%7CTS%3D1641994662">a study</a>&nbsp;featured on the cover of this week’s issue of&nbsp;<a href="https://www.science.org/">Science</a>, U.S. and Danish researchers consider how the loss of species of birds and animals will impact the ability of plants to adapt to human-induced climate change in future. While animals can often fly, walk, run or swim to more suitable areas, trees cannot escape the heat. Tree species that need to move their offspring away from warmer temperatures will only be able to do so via the activities of seed-dispersal agents, such as mammals and birds.&nbsp;



“Some plants live hundreds of years, and their only chance to move is during the short period when they're a seed moving across the landscape,” said <a href="https://www.rice.edu/">Rice University</a> ecologist&nbsp;<a href="https://www.evanfricke.com/">Evan Fricke</a>, the study's first author. “If there are no animals available to eat their fruits or carry away their nuts, animal-dispersed plants aren’t moving very far."



In collaboration with researchers from the University of Maryland, Iowa State University and Aarhus University, the Rice team used machine learning and data from thousands of field studies to map the contributions of seed-dispersing birds and mammals worldwide. They compared maps of seed dispersal today with maps showing what dispersal would look like if there were no human-caused extinctions or species range restrictions.



The experts also used data synthesized from field studies around the world to train a machine-learning model for seed dispersal, and then used the trained model to estimate the loss of climate-tracking dispersal caused by animal declines.



Fricke explained that developing estimates of seed-dispersal losses due to animal and bird extinctions or changes in their ranges required two significant technical advances: “First, we needed a way to predict seed-dispersal interactions occurring between plants and animals at any location around the world."



For this, they used data on species interactions from over 400 field studies that detailed how many seeds are dispersed by particular species of birds and mammals, how far they are dispersed and how well those seeds germinate. Based on this data, the researchers could predict interactions between plants and seed dispersers.



“Second, we needed to model how each plant-animal interaction actually affected seed dispersal,” said Fricke. “For example, when an animal eats a fruit, it might destroy the seeds or it might disperse them a few meters away or several kilometers away.”



The results of the study showed that many seed-dispersing mammals and birds have already been lost, particularly in temperate regions across North America, Europe, South America and Australia. In addition, if currently endangered species go extinct, tropical regions in South America, Africa and Southeast Asia would be severely affected.&nbsp;&nbsp;



“We found regions where climate-tracking seed dispersal declined by 95%, even though they’d lost only a few percent of their mammal and bird species,” said Fricke.&nbsp;



The findings showed that the ability of animal-dispersed plants to keep pace with climate change has been reduced by 60% due to the loss of mammals and birds that help such plants adapt to environmental change.&nbsp;



“In addition to the wake-up call that declines in animal species have vastly limited the ability of plants to adapt to climate change, this study beautifully demonstrates the power of complex analyses applied to huge, publicly available data,” said Doug Levey, program director of the National Science Foundation’s (NSF) Directorate for Biological Sciences, which partially funded the work.



Fricke explained that the study is the first to quantify the scale of the seed-dispersal problem globally and to identify the regions most affected. He emphasized that declines in the populations of seed dispersers highlight an important intersection between the climate and biodiversity crises impacting natural environments today.



“Biodiversity of seed-dispersing animals is key for the climate resilience of plants, which includes their ability to continue storing carbon and feeding people,” he said, adding that restoration of ecosystem connections in natural habitats could counteract some declines in seed dispersal, but not all of them. People also rely, both economically and ecologically, on seed-dispersing birds and mammals to ensure the supply of important resources.&nbsp;



“Large mammals and birds are particularly important as long-distance seed dispersers and have been widely lost from natural ecosystems,” said Svenning, the study’s senior author. “The research highlights the need to restore faunas to ensure effective dispersal in the face of rapid climate change.”&nbsp;



“When we lose mammals and birds from ecosystems, we don’t just lose species. Extinction and habitat loss damage complex ecological networks," said Fricke. "This study shows animal declines can disrupt ecological networks in ways that threaten the climate resilience of entire ecosystems that people rely upon.”



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Some plants won't survive the loss of seed-dispersing animals

In the past, when climates changed, forests became distributed more...

Bald eagle populations have steadily increased in recent decades, after the use of DDT was banned in 1972. However, according to a new study led by <a href="https://www.cornell.edu/">Cornell University</a>, this rebound is currently weakened by the threat of lead <a href="https://www.earth.com/news/poisonous-frogs-warmer-temperatures/">poisoning</a> from gunshot ammunition.&nbsp;



Despite increasing numbers of bald eagles, lead poisoning from eating dead carcasses or parts contaminated by lead ammunition has reduced eagle population growth by 4 to 6 percent annually in the Northeast United States.



“Even though the population seems like it’s recovered, some perturbation could come along that could cause eagles to decline again,” said study senior author Krysten Schuler, an assistant professor in the <a href="https://www.vet.cornell.edu/departments/public-ecosystem-health">Department of Public and Ecosystem Health</a> at Cornell University.



Besides being potentially threatened by habitat loss, climate change, or the West Nile virus and other viral or bacterial outbreaks, bald eagles are increasingly affected by current hunting practices. Many hunters “field dress” game they shot with lead ammunition, leaving contaminated organs where the animal was killed. Bald eagles are scavenging such carcasses, often consuming bullet fragments that later on cause lead poisoning.



Although bald eagle numbers nearly <a href="https://news.cornell.edu/stories/2021/03/bald-eagle-count-quadruples-thanks-part-ebird-data-boost">quadrupled</a> in the lower 48 states between 2009 and 2021, reaching about 316,000, the current findings on the dangers of lead poisoning raise alarms among scientists and conservationists.



“Hopefully, this report will add information that compels hunters, as conservationists, to think about their ammunition choices,” said Professor Schuler. In her view, a better alternative would be the use of copper-based ammunition.



Bald eagles are not the only species endangered by these hunting practices. Trail cameras have repeatedly shown that owls, crows, bears, foxes, coyotes, or <a href="https://www.earth.com/news/fisher-populations-will-struggle-to-survive-increasing-wildfires/">fishers </a>also scavenge the remains left by hunters.



“We haven’t collected data on these other species in the same way that we pay attention to eagles," said Professor Schuler. "We’re putting eagles out there as a poster species for this issue, but they’re not the only ones being impacted."



The study is published in the <a href="https://dx.doi.org/10.1002/jwmg.22177">Journal of Wildlife Management</a>.&nbsp;



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Bald eagles are threatened by poisoning from lead ammunition

Bald eagle populations have steadily increased in recent decades, after...

The world's largest fish breeding area has been discovered in the Antarctic Weddell Sea. Using an advanced underwater camera system, a team of scientists led by the <a href="https://www.awi.de/en/">Alfred Wegener Institute</a> found what is estimated to be 60 million icefish nests near the Filchner Ice Shelf.&nbsp;



The colony represents a fish biomass of more than 60,000 tons, or over 135 million pounds. According to the study authors, their findings provide support for the establishment of a Marine Protected Area in the Atlantic sector of the Southern Ocean.&nbsp;



The researchers towed a camera system and photographed the massive breeding site. The photographs suggest that the icefish nests cover about 240 square kilometers, which is roughly the size of the island of Malta.&nbsp;



"The idea that such a huge breeding area of icefish in the Weddell Sea was previously undiscovered is totally fascinating," said study lead author Autun Purser, a deep-sea biologist at the AWI Helmholtz Centre for Polar and Marine Research.



Since the early 1980s, AWI scientists have been exploring the Weddell Sea with Polarstern, a German research icebreaker. Prior to this study, the team had only detected small clusters of nests.



The observations were made using the Ocean Floor Observation and Bathymetry System (OFOBS), a camera sledge built to survey the ocean floor in extreme conditions.&nbsp;



"After the spectacular discovery of the many fish nests, we thought about a strategy on board to find out how large the breeding area was - there was literally no end in sight. The nests are three quarters of a metre in diameter - so they are much larger than the structures and creatures, some of which are only centimeters in size, that we normally detect with the OFOBS system," said Purser.&nbsp;



"So, we were able to increase the height above ground to about three metres and the towing speed to a maximum of three knots, thus multiplying the area investigated. We covered an area of 45,600 square metres and counted an incredible 16,160 fish nests on the photo and video footage."



<figure class="wp-block-image size-large"><img src="https://www.earth.com/wp-content/uploads/2022/01/Low-Res_20210216_FishnestsWeddellSea_PS124_AWI_OFOBS_Team_003.jpg.png" alt="" class="wp-image-1900975"/><figcaption>Image Credit: AWI OFOBS Team</figcaption></figure>



Based on the images, the round fish nests were about 15 centimeters deep and 75 centimeters in diameter, and were clearly distinguishable from the muddy seafloor.



The team found several types of nests, including active nests that contained an average of 1,700 eggs. About 75 percent of the time, these active nests were guarded by an adult icefish. Overall, about 100,000 nests were captured on film, and many of them were unused.&nbsp;



Further research is needed, but the experts speculate that the colony is an important source of food for predators such as Weddell seals.



“A great many Weddell seals spend much of their time in close proximity to the fish nests,” said Purser. “We know this from historical tracking data and fresh tracking data from our cruise. The nests are exactly where the warmer water is upwelling. These facts may be coincidence, and more work is needed, but the recorded seal data show seals do indeed dive to the depths of the fish nests, so may well be dining on these fish."



The study is published in the journal <a href="https://www.cell.com/current-biology/home">Current Biology</a>.



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Scientists have found the world's largest fish breeding site

The world's largest fish breeding area has been discovered in...

Newborn dairy calves are most often housed separately from each other after being removed from their mothers. Farmers state that keeping calves separate reduces the risk of <a href="https://www.earth.com/news/fast-food-diets-linked-to-rise-in-autoimmune-diseases/">disease</a> transmission, prevents the calves from suckling on one another, and enables more careful feeding and monitoring of individual calves during the first weeks or months of their lives.&nbsp;



Approximately 75 percent and 60 percent of preweaning dairy calves in the United States and Europe, respectively, are housed individually, despite the growing criticisms of this practice in terms of its impacts on calf behavior, welfare and health. The alternative of raising young calves in social groups has, however, received increasing support from scientific quarters and from the concerned public.&nbsp;



A new study published this week in <a href="https://www.jdscommun.org/">JDS Communications</a>, the journal of the American Dairy Science Association, quantifies the motivation of socially naive calves to seek companionship with another calf, when they have the choice.&nbsp;



“Past behavioral studies have indicated that lack of social interaction can negatively affect calves’ feed intake, social skills, coping abilities, and cognitive performance,” stated lead investigator Dr. Marina von Keyserlingk. “However, previous studies on social motivation among young cattle have not addressed the first six to eight weeks of life, when individual housing is the most common.”&nbsp;



In the study, 10 male Holstein calves (average age 5.4 days) were separated into pairs, one of each pair being termed the “subject” while the other was the “partner.” Each pair was housed in a facility consisting of a central home pen with adjacent pens to the left and the right. Pens were separated by one-way push-gates made of plexiglass sheets. After the morning feed of milk, the subject was placed in the central pen, the partner was randomly allocated (by coin toss) to one of the side pens, and the other side pen was left empty.



For 15 days, the calves were checked twice daily at the time of milk feeding (approximately 0800 and 1600 h). At that time, the subject would be found in the central pen, or could have pushed his way through the door into a side pen, either the one containing the partner calf, or the one that was empty. The push-gates swung closed after a calf passed through and would not open in the opposite direction. The subject was returned to the central pen at feeding time.



Each time the subject had pushed his way into one of the side pens, the weight of the gate into that side pen would be increased. This meant that gates were relatively light to push open at the start of the study, when calves were learning the system, but they became more difficult to push as the experiment continued. The maximum weight pushed and number of pushes by each subject calf over the 15-day trial were recorded separately for the two side pens.&nbsp;



“Each time the test calf pushed open the gate to access a side pen, he would remain in it until the next milk feeding (approximately 0800 and 1600 h), at which time he was returned to the central home pen,” explained Dr. von Keyserlingk. “After each successful pushing event, additional weight was added to the gate – initially a small amount, then incrementally higher.”&nbsp;



With this design, the researchers were able to quantify the motivation of the young calves to access company in the form of the partner calf. No prior training of the subject calf was necessary, and the calves learned quickly how to open the gates after first coincidentally pushing a gate open as they investigated it.



The researchers found that, of the 10 calves tested, 8 pushed more weight for the pen on the social side, 1 pushed more for the empty side, and 1 pushed the same weight for both sides. Over the 15-day trial, calves pushed gates weighing, on average 1.0 kg more in order to access the social pen. All calves but one opened a gate on the first day of testing, with the remaining calf pushing a gate open for the first time on the third day.&nbsp;



The results indicate that young calves are motivated to seek full social contact, even when they have to work harder to achieve this. They are clearly social animals and derive benefit from contact with other calves.&nbsp;



A recent U.S. survey found that approximately half the participants considered individual housing of calves unacceptable, often mentioning the lack of socialization as a major issue. The results of the current study add to the body of research evidence that highlights the importance of social contact for calves.&nbsp;



The authors also note that the testing method used in this study did not require training, but calves quickly learned to use the gates on their own, suggesting that this task could be readily used to assess spontaneous motivation in other situations as well.



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Dairy calves prefer to be housed with a companion

Newborn dairy calves are most often housed separately from each...

New research led by the <a href="https://www.columbia.edu/">University of Columbia</a> and the <a href="https://www.wild-tiger.org/">Wild Tiger</a> non-profit organization has found that the United States plays a much greater role in illegal tiger parts trade than previously thought. While most of the studies on tiger trafficking patterns focused on 13 Asian countries, the new findings show that the United States was responsible for almost half of the global illegal tiger trade between 2003 and 2012.



Tigers are an <a href="https://www.earth.com/news/switching-to-solar-energy-affects-endangered-florida-panthers/">endangered</a> species, with less than 5,000 specimens estimated to remain in the wild. Illegal trade in tiger parts (mostly for medicinal purposes) plays a significant role in threatening tiger populations worldwide.



While China has been and remains the main destination and consumer of tiger parts, data from the <a href="https://www.fws.gov/">U.S. Fish and Wildlife Services</a> shows that the United States’ import seizures of tiger parts between 2003 and 2012 represented a staggering 46.8 percent of total global seizures.



“People in the U.S. have this false notion that the illegal trade in tiger parts is half a world away. In reality, we in the U.S. are involved in and driving a large portion of the illegal trade,” said study lead author Sarika Khanwilkar, a Ph.D. candidate at Columbia University and the founder of the non-profit&nbsp;organization Wild Tiger. “This research is a step to better understand the role of the U.S. in the global tiger trade, which will improve policy and enforcement and direct future research efforts.”



According to Khanwilkar and her colleagues, there were 292 seizures of tiger parts illegally entering the United States between 203 and 2012, the majority of them being imported from China (34.2 percent) and Vietnam (29.5 percent). However, since the use of digital platforms to trade illegal wildlife products has increased, and economic prosperity has expanded demand, the current study may underestimate the full scale of illegal tiger parts trafficking in the United States.



In order to better monitor the source and trafficking routes of tiger parts, the researchers propose enhancing detection efforts in main hotspots for illegal tiger imports such as San Francisco, Dallas, and Atlanta. They also recommend using forensic DNA analysis to determine the origin and source (wild or captive) of the tiger parts and thus help providing guidance on where to focus conservation and enforcement efforts.



The study is published in the journal <a href="https://conbio.onlinelibrary.wiley.com/doi/10.1111/csp2.622">Conservation Science and Practice</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

The U.S. plays a major role in the illegal tiger trade

New research led by the University of Columbia and the...

A new study led by the <a href="https://www.rsmas.miami.edu/">University of Miami Rosenstiel School of Marine and Atmospheric Science</a> has found that the locations and timing of tiger <a href="https://www.earth.com/news/sharks-important-deserve-protections/">shark</a> movements in the western part of the North Atlantic Ocean have shifted due to rising ocean <a href="https://www.earth.com/news/marine-heatwaves-could-severely-affect-the-fishing-industry/">temperatures</a> caused by climate change. By pushing tiger sharks outside of protected areas, these climate-induced factors make the animals more vulnerable to commercial fishing.&nbsp;



The tiger shark (Galeocerdo cuvier) is the largest cold-blooded predator in tropical and warm-temperate seas and oceans. While waters off the United States’ northeast coast have historically been too cold for these fierce predators, recent increases in ocean temperatures have made them suitable.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag, the director of the University of Miami’s <a href="https://sharkresearch.rsmas.miami.edu/">Shark Research and Conservation Program</a>. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



Professor Hammerschlag and his colleagues analyzed nine years of tracking data from satellite-tagged tiger sharks, together with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) <a href="https://www.fisheries.noaa.gov/resource/document/cooperative-shark-tagging-program">Cooperative Shark Tagging Program</a>, in order to assess how changes in water temperatures affected shark habitats and movements.



They found that during the last decade (when ocean temperatures were the warmest on record), for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. Moreover, they also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



According to the scientists, these results have greater ecosystem implications. “Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



The study is published in the journal <a href="https://doi.org/10.1111/gcb.16045">Global Change Biology</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Tiger shark migrations are shifting as temperatures rise

A new study led by the University of Miami Rosenstiel...

Thailand is often overlooked in terms of its natural beauty and biodiversity, even as its natural environments face the threats of development that loom everywhere in the world. Illustrating this point is the discovery of a new genus of tarantula that lives inside of bamboo stalks.



Dr. Narin Chomphuphuang, an arachnologist at Khon Kaen University, explained the context of the discovery. “Few people realize how much of Thailand's wildlife remains undocumented. Thai forests now cover only 31.64% of the country's total land area. We are primarily on a mission to research and save the biodiversity and wildlife within these forests from extinction, especially species-specific microhabitats.”



The tarantula was first found by JoCho Sippawat, a famous Thai wildlife YouTuber, who later teamed up with Dr. Chomphuphuang. The pair also collaborated with Chaowalit Songsangchote of Kasetsart University, who formally described the newly discovered tarantula.



The scientists named the spider Taksinus bambus, the generic name honors the Thai king Taksin the Great, who was once governor of Tak province - where the tarantula was found. Bambus is in reference to the arachnids' curious way of living in bamboo, something never before seen in a tarantula.&nbsp;



The spiders themselves do not create holes or cracks in bamboo stalks but instead rely on other animals such as bamboo worms, carpenter beetles or rodents to do this work. Once the spider moves into a bamboo stalk, the animal lines the new home with silk.&nbsp;



There are other arboreal tarantulas found in southeast Asia, but this is the first to be discovered in northern Thailand. It’s also unusual because it specializes in one particular type of plant.



&nbsp;“We examined all of the trees in the area where the species was discovered. This species is unique because it is associated with bamboo, and we have never observed this tarantula species in any other plant. Bamboo is important to this tarantula, not only in terms of lifestyle but also because it can only be found in high hill forests in the northern part of Thailand, at an elevation of about 1,000 m. It is not an exaggeration to say that they are now Thailand's rarest tarantulas,” said Dr. Chomphuphuang.



The study is published in the journal <a href="https://zookeys.pensoft.net/">ZooKeys</a>.



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By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer



Image Credit: JoCho Sippawat

New tarantula found in Thailand lives in bamboo stalks

Thailand is often overlooked in terms of its natural beauty...

A study published in the journal <a href="https://www.nature.com/articles/s41598-021-03599-9">Nature Scientific Reports</a> reveals fascinating new details about Struthiosaurus austriacus, a relatively small nodosaurid from the Ankylosaur family that lived in the Late <a href="https://www.earth.com/news/tiny-pterosaurs-were-fierce-competitors-in-the-late-cretaceous/">Cretaceous</a>. The experts report that the dinosaur had a lonesome lifestyle due to its inferior sense of hearing and sluggish movement.&nbsp;



Ankylosaurs are a group of herbivorous dinosaurs that grew up to eight meters and had bodies cluttered with bony plates and spikes, resembling “living fortresses.” Some of their most representative members, such as ankylosaurids, has a club tail, while nodosaurids were famous for their elongated spikes on their necks and shoulders.



While many dinosaurs were rather gregarious creatures, living in social groups, at least some ankylosaurs seemed to prefer a lonesome life. By studying with a high-resolution computer tomograph the fossil braincase of a specimen discovered near Muthmannsdorf, a town south of Vienna, Austria, a team of paleontologists led by the <a href="https://www.uni-greifswald.de/">University of Greifswald</a> and <a href="https://www.univie.ac.at/en/">University of Vienna</a>, has found that Struthiosaurus austriacus most probably had significant difficulties in locomotion and audition, which made it less prone to social interaction.



The dinosaur’s flocculus, an evolutionary old part of the brain responsible for the fixation of the eyes during motions of the head, neck, and body was very small. Together with the extremely short lagena (the part of the inner ear where hearing takes place), this feature suggests that the dinosaur probably had an exceptionally sluggish lifestyle compared to other species.&nbsp;



“In contrast to its Northamerican relative Euoplocephalus, which had a tail club and a clear flocculus on the brain cast, Struthiosaurus austriacus may have rather relied on its body armor for protection,” said study lead author Marco Shade, a paleontologist at the University of Griefswald.



“The short anterior and angular lateral semicircular canals, combined with the relatively shortest dinosaurian cochlear duct known so far and the lack of a floccular recess suggest a rather inert lifestyle without the necessity of sophisticated senses for equilibrium and hearing in&nbsp;S. austriacus. These observations agree with an animal that adapted to a comparatively inactive lifestyle with limited social interactions,” concluded the study authors.



Image Credit: © Fabrizio De Rossi



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer&nbsp;

Late Cretaceous dinosaur was sluggish and nearly deaf

A study published in the journal Nature Scientific Reports reveals...

Florida is rapidly increasing the installation of utility-scale solar energy (USSE) facilities, aiming to decrease greenhouse gas <a href="https://www.earth.com/news/u-s-greenhouse-emissions-rebounded-in-2021/">emissions</a> and mitigate climate change. Over the next decade, the solar capacity of the state is expected to increase from 1,743 to 12,537 megawatts. However, the expansion of sustainable energy comes with a cost: the installation of USSE facilities may significantly impede the habitats and movements of an already endangered species, the Florida panther.



This magnificent animal once ranged throughout the entire southeastern United States. Today, it is restricted to roughly five percent of its historical range in South Florida. The panthers need corridors for dispersal and have extremely large home ranges of up to 200 square miles. Their survival relies on their ability to move unimpeded from one protected area to another through wildlife corridors.



By using panther radio-telemetry data collected by the <a href="https://myfwc.com/">Florida Fish and Wildlife Conservation Commission</a> (FWC) from 1981 to 2020, a research team led by <a href="https://www.fau.edu/">Florida Atlantic University</a> (FAU) analyzed the impact the installation of USSE facilities may have on panther habitat suitability and mobility. The scientists found nine facilities located within major corridors currently used by Florida panthers, as well as over 20 other facilities that may impede to some degree the animals’ core habitats and dispersal areas.



“Our study suggests that in the drive to shift our energy production to carbon neutral sources, while maintaining maximum profitability, wildlife outside human dominated landscapes with large ranges and dispersal potentials may be pushed into less favorable habitat or cut off completely from available habitat by degradation of corridors,” said study senior author Olena V. Leskova, a doctoral student in Geosciences at FAU.



“Formally protecting and enhancing the remaining corridors between core areas at the landscape-scale will potentially ameliorate, or mitigate, the impacts already evident after installation of some facilities, and may prevent foreseeable impacts with additional planned facilities,” added study co-author Scott H. Markwith, a professor of Geosciences at FAU.



“Restoring dispersal corridors and gene flow throughout Peninsular Florida is critical to the Florida panther, its prey, and ancillary species that benefit from a connected Florida ecosystem. This, in turn, will benefit biodiversity and species resiliency at the landscape-scale.”



The researchers expect other species, such as gopher tortoises, Florida scrub jays, eastern indigo snakes, Florida black bears, or Florida burrowing owls, to be affected by the building of these large facilities in parts of their territories too.&nbsp;



The study is published in the <a href="https://besjournals.onlinelibrary.wiley.com/journal/13652664">Journal of Applied Ecology</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Switching to solar energy affects endangered Florida panthers

Florida is rapidly increasing the installation of utility-scale solar energy...

On Monday, January 10, 2022, a new <a href="https://www.earth.com/news/invasive-species-are-arriving-with-ships-in-antarctica/">species</a> of rainfrog recently discovered on the sky island of Cerro Chucantí in eastern Panama has been named after the famous environmental activist Greta Thunberg. Pristimantis gretathunbergae was discovered by an international team of researchers funded by <a href="https://www.rainforesttrust.org/">Rainforest Trust</a>, a nonprofit environmental organization.



“Rainforest Trust is deeply honored to sponsor the naming of this exquisite and threatened Panamanian frog species for Greta Thunberg. Greta more than anyone reminds us that the future of every species on Earth depends on what we do right now to end climate change,” said Rainforest Trust CEO James Deutsch.



The research team that discovered this rainfrog was led by Abel Batista, a herpetologist at the <a href="http://www.unachi.ac.pa/">Universidad Autónoma de Chiriquí</a> (Panama) and Konrad Mebert, an independent researcher previously affiliated with the <a href="https://www.unibas.ch/en.html">University of Basel</a> (Switzerland). The two scientists have collaborated for more than ten years and described together 12 new species.



Discovering Pristimantis gretathunbergae has not been an easy task. Reaching the frog’s habitat on Cerro Chucantí, a sky island surrounded by lowland tropical rainforest in eastern Panama, required travelling on horseback through muddy trails, hiking on steep slopes, and camping above 1000 meters.&nbsp;&nbsp;&nbsp;



The rainfrog has distinctive, unusually prominent black eyes, a contrasting light upper lip, a large head, and a single conical tubercle on the upper eyelid. Its current habitats are severely fragmented and threatened by rapid deforestation aiming to replace the pristine region with plantations and cattle pastures. Moreover, rising temperatures caused by climate change are additional stressors for this frog’s small mountain habitat.



“Investigations on the ecology of the new species and its population status, especially at the type locality, are highly recommended. As a flagship species, this new frog can help to preserve the Chucantí cloud forest including several recently described species known only from this isolated area in eastern Panama,” wrote the study authors.



A scientific description of Pristimantis gretathunbergae and its habitat can be found in the journal <a href="https://zookeys.pensoft.net/article/63009/element/8/28012/">ZooKeys</a>.&nbsp;



Image Credit: Konrad Mebert



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

New rainfrog named after climate activist Greta Thunberg

On Monday, January 10, 2022, a new species of rainfrog...

A special issue of the journal Nature Reviews Earth &amp; Environment is shedding light on rapidly changing Arctic coasts. Scientists at the <a href="https://www.awi.de/en/">Alfred Wegener Institute</a> (AWI) describe the potential consequences of shifting Arctic shorelines for humans, animals, and the environment.



“The pace of changes in the Arctic is increasing, leading to accelerated coastal retreat,” said Dr. Anna Irrgang of the AWI Helmholtz Centre for Polar and Marine Research. “This affects both the natural and human environment, for example, by releasing carbon from the soil into the sea and atmosphere, or losing the land that supports communities and infrastructure.”



Arctic coastal regions are not uniform. For example, shorelines in Alaska, Canada and Siberia are made of heavy permafrost bluffs that are resistant to wave action under cold temperatures, but vulnerable as they warm up. Other shorelines, such as those found in Svalbard, are rocky and less fragile. With temperatures rising, however, scientists expect that all of these coastal systems will change to some degree.



“Predictions about this are often subject to large uncertainties because reliable oceanographic and environmental data for remote coastal zones are limited,” said Dr. Irrgang.



“Our current understanding of Arctic coastal dynamics is fragmented, with too few data with high spatial and temporal resolution on environmental factors and shoreline changes."&nbsp;



“While such datasets already exist for some regions such as northern Alaska, most of the Arctic coast is poorly mapped.”&nbsp;



The report highlights the urgent need for more observations and research on fragile Arctic coastal systems. This sort of work could greatly improve the accuracy of predictions and help scientists and policy makers prepare for the future.&nbsp;



The state of Arctic coasts have far-reaching impacts on water availability, erosion, plant and animal life as well as human well-being.&nbsp;



“For this, we need to develop adaptation methods that enable good and sustainable living conditions in Arctic coastal settlements. Close cooperation with local people is central to this,” said Dr. Irrgang.



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By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Rising temperatures are transforming Arctic coasts

A special issue of the journal Nature Reviews Earth &amp;...

A new study published in the journal <a href="https://esajournals.onlinelibrary.wiley.com/doi/10.1002/ecs2.3877">Ecosphere</a> has found that the recovery of the fisher, an endangered forest carnivore native to Canada and northern United States, will likely be hindered by the increasing frequency and severity of <a href="https://www.earth.com/news/wildfires-and-extreme-heat-waves-increase-air-pollution/" data-type="news" data-id="1900604">wildfires</a>. Scientists led by <a href="https://oregonstate.edu/">Oregon State University</a> (OSU) discovered that fisher abundance declined significantly after three mixed-severity wildfires from the summers of 2014 and 2016.



A fierce and secretive animal, the fisher is a member of the Mustelidae family, which also includes badgers, wolverines, minks, and otters. They are roughly the size of a large house cat. With hind feet that rotate almost 180 degrees, fishers can not only scale trees, but can also climb down head first. These abilities help them attack prey from above or carry offspring in their mouths as they climb up and down trees.



Fisher populations have persistently declined during the 19th and 20th centuries due to fur trapping and logging. With the recent wildfires affecting the Klamath-Siskiyou Ecoregion, a 50,000-square-kilometer area straddling the Oregon-California border and hosting the largest fisher populations, their numbers have dwindled even more.



“The fisher has a limited distribution, and rapid changes to forest structure could threaten its long-term persistence,” said study lead author David Green, a conservation ecologist at OSU. “We estimated a 27 percent reduction in the total number of fishers within our study area following the fires.”&nbsp;



Strangely, Dr. Green and his colleagues have found that, while fisher density decreased regardless of wildfire intensity, gray fox populations showed a significant decline after medium-severity wildfires, but actually increased after high-severity fires.



“Our results suggest that increased severity, extent and frequency of wildfires in the western United States will have negative impacts on fisher populations and change community composition for medium-size predators. We found that the wildfires that occurred in the Klamath-Siskiyou Ecoregion affected fisher density negatively regardless of burn severity, while gray fox density decreased in areas that burned at medium severity and increased in areas that burned at high severity.”



Further research is needed to understand why the different wildfire severity levels had different impacts on the two species of animals studied.



“Understanding the effects of wildfire on the species that live in forests, and the interactions among species, is important for making the most effective conservation and management decisions. The short- and long-term consequences are unclear for wildlife amid the calls for restoring forests to their natural regimes of frequent, low-severity fires,” Dr. Green concluded.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Fisher populations will struggle to survive increasing wildfires

A new study published in the journal Ecosphere has found...

Ecological interactions are often not simple or straightforward in nature. Instead, they commonly represent trade-offs between different processes so that the best compromise is reached in the end.&nbsp;This is exactly what scientists from the <a href="https://www.ice.mpg.de/">Max Planck Institute for Chemical Ecology</a> found when they investigated the choices made by female tobacco hawkmoths (Manduca sexta) when laying their eggs. 



The hawkmoths did not always make the obvious choice when placing their eggs on the leaves of <a href="https://www.earth.com/news/invasive-plants-cause-a-global-loss-of-floristic-uniqueness/">plants</a> that would provide food for the larvae, once they hatched. Previous research had shown that tobacco hawkmoths avoid laying their eggs on plants where they smell the feces of other hawkmoths. “This is apparently their way of avoiding food competition. Therefore, we wondered whether the moths also avoid plants infested by other herbivorous insects,” explained study first author Jin Zhang.



In the lab, the researchers gave female hawkmoths a choice between laying their eggs on sacred Datura plants (Datura wrightii) that were infested with three-lined potato beetles (Lema daturaphila) or Datura plants that had no potato beetles. Both adult and larval potato beetles feed on the leaves of this plant, and the researchers hypothesized that the hawkmoths would avoid plants where potato beetles were present in order to ensure the maximum supply of food for their offspring.&nbsp;



But the hawkmoth females surprised the researchers by laying their eggs, preferentially, on the leaves of Datura plants that already hosted numerous potato beetles.&nbsp;&nbsp;



“To be honest, we were a little frustrated at first because we had expected the experiments to confirm our initial hypothesis, namely that egg-laying tobacco hawkmoths avoid food competitors,” explained study leader Markus Knaden.



“In our case, however, the unexpected observation suddenly made sense when we realized that beetle-infested plants smell quite differently and that parasitoid wasps, which often use plant odors to find their host insects, are less efficient at detecting tobacco hornworms on beetle-infested plants."



Tobacco hornworms, the larvae or caterpillars of tobacco hawkmoths, are heavily parasitized by the wasp&nbsp;Cotesia congregate, which lays its eggs in the caterpillars. Up to 90 percent of these caterpillars are parasitized by wasps and die shortly after the wasp larva hatches. Female hawkmoths therefore need to consider not only the available food supply for their larvae, but also their potential exposure to this parasitic wasp species.



The experts analyzed the odor given off by Datura&nbsp;plants when they carry an infestation of three-lined potato beetles compared to the odor emitted when there is no infestation. They found that infested plants produce more alpha-copaene in the in their odor when the beetles and their larvae are present. Interestingly, these three-lined potato beetles coat themselves with their own feces, possibly as a means of deterring would-be predators and parasites.&nbsp;



The research team then tried to establish how exactly the tobacco hawkmoth females detect the presence of the molecular substance alpha-copaene. Of the 70 potential chemical receptors present in the hawkmoths, the researchers identified a single one, Or35, as the odorant receptor activated by alpha-copaene. They suggest that this receptor is probably involved in the moth’s choice of where to deposit its eggs.



Next, the experts tested the choices made by the wasps (Cotesia congregate) that parasitize tobacco hawkmoth caterpillars. They found that the wasps preferred the odor of plants on which tobacco hornworms were feeding, but they also avoided the odor of plants that were infested with potato beetles. These results were confirmed by assays in an experimental tent containing&nbsp;Datura&nbsp;plants infested by tobacco hawkmoths only, or by tobacco hawkmoths and potato beetles together. Wasps also avoided plants with beetles in this setting.



The findings indicate that female tobacco hawkmoths, when choosing where to lay their eggs, weigh up the benefit for their larvae of having no food competition against the disadvantage of being parasitized by the wasps. Although tobacco hornworms develop more slowly on plants that are additionally infested by beetles, the mother moths accept this disadvantage when laying their eggs. The advantage of protecting their offspring from parasitic wasps must therefore outweigh the disadvantage of food competition. Such cost-benefit trade-offs play a significant role in many ecological interactions.&nbsp;



“Our results show that in nature, simple explanations are often not sufficient. Tobacco hawkmoths do not only have to take into account whether a plant is a good food substrate for their offspring, but also whether potential competitors are already present, and whether the presence of these competitors could even help to hide [their offspring] from predators,” concluded study co-author Bill Hansson.



The researchers will focus future studies on the reasons why&nbsp;Datura&nbsp;plants emit different odors depending on the insects that feed on them. They plan to use interdisciplinary approaches that also consider, for example, the role of microorganisms in these complex interactions, and hope to uncover further exciting aspects of the multifaceted interactions between living organisms.



The study is published in the journal <a href="https://www.cell.com/current-biology/home">Current Biology</a>.



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Complex factors determine where hawkmoths lay their eggs

Ecological interactions are often not simple or straightforward in nature....

The sexual anatomy of marine <a href="https://www.earth.com/news/small-mammals-are-vanishing-in-the-uk/">mammals</a> is difficult to understand fully because we cannot be present when these animals mate underwater in the world’s oceans. And when scientists do get hold of dead specimens, their sexual organs are usually shriveled and not in a life-like state.&nbsp;



However, in a study published today in the journal <a href="https://www.cell.com/current-biology/home">Current Biology</a>, researchers from Mount Holyoke College, the University of Florida and Texas A&amp;M University report on their detailed examination of the structure and neurology of the clitoris in female bottlenose dolphins. They explain that female dolphins have a very obvious clitoris that sits at the entrance to the vagina but that there has been little study of this organ or of female sexual pleasure in nature, in general. 



The researchers became curious about the function of the clitoris while studying the evolution of vaginas in dolphins. The position of the clitoris in a dolphin’s vagina would make stimulation during copulation likely, and thus the researchers questioned whether the structure of the organ in dolphins would reveal evidence that it functions to produce sensations of pleasure.



“Every time we dissected a vagina, we would see this very large clitoris, and we were curious whether anyone had examined it in detail to see if it worked like a human clitoris,” said study&nbsp;first author Professor Patricia Brennan. “We knew that dolphins have sex not just to reproduce, but also to solidify social bonds, so it seemed likely that the clitoris could be functional.”



Dolphins are among the few mammalian species that are involved in sexual behavior at times when they cannot conceive. This has led to the hypothesis that dolphins may be sexually active not only in the name of reproduction, but also because this brings them pleasure.&nbsp;



Brennan and colleagues examined the clitoris from each of 11 female dolphins that had died naturally. They analyzed the shape and configuration of erectile bodies within the organ, as well as the nature and pathways of nerves that ran through the tissues. Their results supported the hypothesis that female dolphins have a functional clitoris that helps to make the sexual experience pleasurable.&nbsp;



“Just like the human clitoris, the dolphin clitoris has large areas of erectile tissue that fill up with blood,” said Professor Brennan.



The erectile tissue changes shape as dolphins mature, which suggests that it acquires a function that is associated with being an adult. Their studies also show that the clitoris body has large nerves and many free nerve endings right underneath the skin, which is much thinner there than in the adjacent skin. They also found genital corpuscles much like those previously described in the human clitoris and penis tip, which are known to be involved in the pleasure response.



Overall, Professor Brennan says that the erectile bodies in dolphins are “surprisingly similar” to the shape of the erectile bodies in humans.



“Since the entire pelvis of dolphins is so different to humans, it was surprising to see how similar the shapes were. Also, the size of the nerves in the clitoris body was very surprising. Some were larger than half a millimeter in diameter.”



This research helps to remedy the situation that the general anatomy of the clitoris in female mammals has often been inadequately or inaccurately described in the past, and the deep structures of the organ have historically been overlooked. In fact, even the human clitoris wasn’t fully described until the 1990s.&nbsp;



“This neglect in the study of female sexuality has left us with an incomplete picture of the true nature of sexual behaviors,” said Professor Brennan. “Studying and understanding sexual behaviors in nature is a fundamental part of understanding the animal experience and may even have important medical applications in the future.”



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By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer&nbsp;

Female dolphins have a clitoris that provides sexual pleasure

The sexual anatomy of marine mammals is difficult to understand...

New research led by the <a href="https://www.exeter.ac.uk/">University of Exeter</a> has found that pheasants’ heads cool rapidly as they prepare to <a href="https://www.earth.com/news/hyenas-make-faces-when-they-want-to-play-fight/">fight</a> due to a stress response during which blood runs to the body’s core. Their heads then heat up again afterward, as normal blood flow is restored.



The researchers used thermal cameras to watch juvenile pheasants (six or seven weeks old), and see how their temperature changed during aggressive interactions that often occur in order to establish the “pecking order” - a term coined by the Norwegian zoologist Thorleif Schjelderup-Ebbe over a century ago to describe the dominance hierarchy characterizing many animal species.&nbsp;



"Thermal cameras provide a unique opportunity to non-invasively measure dynamic changes in physiological state over a short period of time," explained study co-author Dr. Mark Whiteside, a behavioral ecologist and applied ethologist at the <a href="https://www.plymouth.ac.uk/">University of Plymouth</a>. "Using this technique we were able to measure responses to aggressive interactions, in semi-natural environments, in real time."



The researchers found that both the instigator and the recipient of the aggression grew more cool-headed before a fight due to a stress response common in multiple animal species, which is crucial in relocating the blood flow in parts of the body core where it is more useful during a fight.



"We were surprised that both individuals in these aggressive encounters followed a similar pattern of cooling and heating," said&nbsp;study lead author Dr. Tim Fawcett, an expert in Animal Behavior, Evolution, and Behavioral Ecology at the University of Exeter.



"We expected that a fight would be more stressful for the pheasant on the receiving end of the aggression, and therefore that we'd see a stronger response in them. We can't say for certain what causes this pattern, but it could be that maintaining a place at the top of the pecking order is just as stressful as being at the bottom."



While both male and female pheasants followed a similar pattern of cooling and heating before and after a fight, the scientists found that females were cooler on average. Further research is needed to fully understand these gender differences.



The study is published in the journal <a href="https://royalsocietypublishing.org/journal/rstb">Philosophical Transactions of the Royal Society B</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Pheasants’ heads literally cool off as they prepare to fight

New research led by the University of Exeter has found...

Ocean warming, acidification, <a href="https://www.earth.com/news/lakes-are-losing-oxygen-much-faster-than-oceans/">oxygen</a> depletion and other changes are impacting marine animals, and these impacts include the displacement of some fish species. To understand these changes, an international team of scientists led by <a href="https://www.uni-kiel.de/en/">Kiel University</a> (CAU) has created an environmental model of the warm period 125,000 years ago (Eemian interglacial) using sediment samples from the Humboldt Current system off the coast of Peru.&nbsp;



The research shows that the warming of the Humboldt Current could have far-reaching consequences, and that ocean warming is a major threat to the world's fish supply.&nbsp;



The experts found that under warmer conditions, smaller goby-like fish dominated the environment, while important food species such as anchovies were pushed back. The results are independent of management or fishing practices in the region.&nbsp;&nbsp;



"The conditions of this past warm period that we were able to reconstruct from our samples can definitely be compared to the current development and put in context with future scenarios," said study first author Dr. Renato Salvatteci.&nbsp;



"According to this, there is a clear regime shift towards smaller fish that feel more comfortable in the warm, lower-oxygen conditions. We conclude from our results that the effects of human-induced climate change may have a stronger influence on the evolution of stocks in the region than previously thought."



The area off the coast of Peru is one of the world’s most important fisheries, supplying roughly eight percent the total global catch of marine species. Around ten percent of the world’s anchovies are caught in this region, with much of them being processed into fish meal for aquaculture projects abroad. Smaller fish are better able to survive in warmer, less oxygenated water. The research shows that ocean warming in the Humboldt Current upwelling area may soon reach an irreversible tipping point. Beyond this threshold, commercial fisheries that are an important part of the global food supply chain could start to collapse.&nbsp;&nbsp;&nbsp;



"In contrast to the present-day anchovy-dominated state, the last interglacial was characterized by considerably smaller (mesopelagic and goby-like) fishes and very low anchovy abundance," wrote the study authors.



"These small fish species are more difficult to harvest and are less palatable than anchovies, indicating that our rapidly warming world poses a threat to the global fish supply."



The study is published in the journal <a href="https://www.science.org/">Science</a>.



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By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Ocean warming threatens the global fish supply

Ocean warming, acidification, oxygen depletion and other changes are impacting...

The Omicron variant has already spread all over the world, causing an enormous number of infections in many countries, including all-time records in the US, UK, Australia, and many places in Europe. Although it appears to be <a href="https://www.earth.com/news/omicron-is-surging-but-may-cause-less-severe-illness/">milder</a> than previous coronavirus variants, its high <a href="https://www.earth.com/news/omicron-high-transmissibility-and-chance-for-reinfection/">transmissibility</a> - as well as its ability to partly <a href="https://www.earth.com/news/omicron-partial-immune-evasion-after-vaccination/">evade</a> antibodies gained after prior infection or vaccination - could still lead to high rates of hospitalization and deaths.



One of the most puzzling aspects of this variant is the high number of mutations that it acquired compared to previous strains such as the wild-type virus first found in Wuhan in 2019. Since Omicron is clearly not a direct descendent of other variants of concern such as Alpha, Beta, or Delta, scientists want to know where this variant originated and how it managed to gain such an extraordinary contagiousness.



One of the hypotheses regarding Omicron’s origin is that it started circulating in mid-2020 in a location without much genetic monitoring or testing capacity (possibly an African country), and that a year and a half later it managed to pick up so many mutations that it practically “exploded onto the scene” in November, in South Africa’s Gauteng province. However, this theory is unlikely considering that such a contagious coronavirus strain would have probably been noticed much earlier.



Another hypothesis is that one of SARS-CoV-2’s previous variants (or perhaps even the Wuhan wild-type) has infected a severely immunocompromised person (possibly an untreated HIV patient). The virus was not lethal, but remained in the individual's body long enough to acquire a vast number of mutations. The most troubling question with this theory, however, is how the variant was not spread by this person sooner.



A new study published in the <a href="https://www.sciencedirect.com/science/article/pii/S1673852721003738">Journal of Genetics and Genomics</a> is offering a fascinating alternative hypothesis. According to a research team led by the <a href="https://english.cas.cn/">Chinese Academy of Sciences</a>, the rapid accumulation of mutations in the Omicron variant that enabled its fulminant global outbreak suggests that its proximal origin may have been an animal rather than a human host - most likely mice.



“The molecular spectrum of mutations acquired by the progenitor of Omicron was significantly different from the spectrum for viruses that evolved in human patients&nbsp;but resembled the spectra associated with virus evolution in a mouse cellular environment,” the study authors wrote.



“Furthermore, mutations in the Omicron spike protein significantly overlapped with SARS-CoV-2 mutations known to promote adaptation to mouse hosts, particularly through enhanced spike protein&nbsp;binding affinity&nbsp;for the mouse cell entry receptor.”&nbsp;



Thus, it seems highly possible that, at some point during 2020, the virus jumped from humans to mice, where it rapidly accumulated this staggering number of mutations, then jumped back into humans towards the end of 2021, “indicating an inter-species evolutionary trajectory for the Omicron outbreak.”



If this hypothesis will turn out to be true, it will add to the evidence that the hope of a final eradication of SARS-CoV-2 becomes increasingly less probable the more we learn about this virus. While animal populations remain susceptible to SARS-CoV-2 infection, there is always the possibility that the virus will spill back into humans at some point, probably in highly mutated forms. And whether these new strains will turn out to be more or less pathogenic will most likely be a matter of pure luck (or bad luck), an evolutionary gambit.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Did the Omicron variant jump to humans from mice?

The Omicron variant has already spread all over the world,...

A recent statement from the Bureau of Land Management (BLM) laid out a plan to permanently remove 19,000 wild horses and burros from public land, The <a href="https://americanwildhorsecampaign.org/">American Wild Horse Campaign</a> (AWHC) issued a response, criticizing the Biden administration for utilizing an "unscientific" management plan.&nbsp;



The AWHC points out that there are already 58,000 wild horses and burros in government holding pens, and adding to this number is unlikely to help matters.&nbsp;



The National Academy of Sciences (NAS) has already concluded that roundup removals are counterproductive. Instead of lowering populations, these roundups lead to artificial population growth. Instead, the NAS recommends birth control vaccines to control equid populations. “It is extremely disappointing that the Biden Administration has chosen to pursue the unscientific policy of mass roundups for the management of our nation’s iconic, federally protected wild horse and burro populations," said the AWHC statement.



"The mass removal of these cherished animals from our public lands won’t solve any of the pressing environmental problems facing our public lands today, but it will cost taxpayers billions of dollars - and the lives of far too many horses and burros.”



As it now stands, wild horses occupy a mere 12 percent of BLM managed land, outnumbered by commercial grazing livestock. These farm animals damage the land and contribute to climate change as well as compete with wild horses and other animals for resources.&nbsp;



AWHC and other organizations such as the Sierra Club push for removal of these animals as a way to combat climate change and make room for other creatures.&nbsp;



The statement by AWHC ends on a high point, wishing that the BLM will change its tactics under the new leadership of Tracy Stone-Manning.



“As part of the FY22 House and Senate Interior Appropriations bills, a portion of BLM’s annual budget was allocated toward fertility control vaccines and directed the BLM to implement fertility control as a step away from costly and inhumane roundups," said the statement.



"We hope that the new leadership at the BLM will take this opportunity to change course toward truly scientific and sustainable management that will protect and preserve America’s wild horses and burros and the public lands they call home.”



---By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

America's wild horse removals are counterproductive

A recent statement from the Bureau of Land Management (BLM)...

A recent study published in the <a href="https://onlinelibrary.wiley.com/doi/epdf/10.1111/jfb.14970">Journal of Fish Biology</a> has found that <a href="https://www.earth.com/news/as-oceans-warm-up-smaller-species-of-fish-will-dominate/">fish</a> become sexually active and spawn for the first time in response to growth-induced respiratory stress. Thus, the prevailing predictor of maturation in fish appears to be a redirection of energy from growth to reproduction.



Researchers from the <a href="https://english.cas.cn/">Chinese Academy of Sciences</a> and the <a href="https://www.ubc.ca/">University of British Columbia</a> (UBC) estimated the ratio of oxygen consumption at maximum size and mean size at first maturity in 200 fish populations spanning 133 species of fishes. They found that fish reach adulthood when this ratio is approximately 1.40.



“The consistency of this ratio across the species we looked at – and other species studied in the past or now being studied – supports the idea that reproduction is initiated by changes in the balance between oxygen supply and demand,” explained study senior author Dr. Daniel Pauly, the principal investigator of UBC’s&nbsp;<a href="https://www.seaaroundus.org/">Sea Around Us&nbsp;</a>initiative.



“Maturation and spawning appear to be induced when the supply of oxygen relative to the weight of individual fish declines. Thus, growing fish gradually become oxygen-limited, and there is a threshold, now identified, which tells them that it’s time to respond to external stimuli for maturation and spawning.”



According to Dr. Pauly’s “Gill Oxygen Limitation Theory (GOLT),” the oxygen supply of fish gradually declines as their weight increases because their gills (the organs used to extract oxygen from the water) are two-dimensional surfaces which cannot keep up with the development of their three-dimensional bodies. At a certain point, fish’s growth leads to a decline in gill surface area, which causes a critical level of oxygen supply. “This triggers the hormonal cascade that pushes fish to respond to environmental stimuli to mature and spawn,” said Dr. Pauly.



“Being able to corroborate with empirical evidence that respiratory stress is what prompts fish to reach first maturity when they do is a nice achievement,” added study co-author Dr. Cui Liang, a researcher in Oceanography at the Chinese Academy of Sciences. “This has important implications for aquaculture practitioners, who have long known the importance of dissolved oxygen in fish production.”&nbsp;



Moreover, according to the scientists, the study findings can also be used explain why fish stressed by rise in sea temperature and deoxygenation caused by climate change may tend to reproduce at smaller sizes.&nbsp;



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Respiratory stress is linked to the sexual maturation of fish

A recent study published in the Journal of Fish Biology...

A new study led by <a href="https://www.psu.edu/">Pennsylvania State University</a> has found that dairy farmers from the Northeast U.S. can reduce the environmental impact of their practices and maximize their revenues by double cropping and injecting manure into the soil instead of broadcasting it. These findings are particularly important in the context of ongoing <a href="https://www.earth.com/news/plants-can-slow-global-warming-but-they-cannot-stop-it/">global warming</a> which exacerbates nutrient pollution and lengthens the growing season.



According to scientists, warmer conditions will induce increased ammonia volatilization from manure, as well as more frequent and severe storms that will cause phosphorous runoff. Thus, new strategies are urgently needed to limit nitrogen and phosphorous losses from crop fields, and subsequent environmental pollution.



By using the <a href="https://www.ars.usda.gov/northeast-area/up-pa/pswmru/docs/integrated-farm-system-model/">Integrated Farm System Model</a> developed by C. Alan Rotz, an agricultural engineer at the <a href="https://www.usda.gov/">U.S. Department of Agriculture</a>, scientists simulated several farm management strategies under different climate conditions in order to determine their possible effects on crop yields, nitrogen and phosphorous losses, feed production, sediment erosion, fossil energy use, and production costs.&nbsp;



The researchers found that double cropping and subsurface injection of manure reduced nitrogen losses by 12 to 18 percent and phosphorous losses by 16 to 19 percent, while maintaining and potentially even reducing farm-production costs.



“There’s a lot of interest in double cropping among Northeast dairy farmers,” said study co-author Heather Karsten, an associated professor of Crop Production and Ecology at Pennsylvania State University. “I think farmers are realizing they have a longer growing season, and there are more precipitation events in spring that make getting into the field to do any operation more challenging. Our results demonstrate that adoption of these strategies can help mitigate dairy farm environmental impacts now and even more in the future.”



According to Professor Karsten and her colleagues, reducing projected increases in soluble phosphorous runoff and ammonia emissions caused by warmer temperature and increased levels of precipitation provides a feasible adaptation and mitigation approach for current and future climate change.&nbsp;



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/abs/pii/S0308521X21002791?via%3Dihub">Agricultural Systems</a>.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Dairy farmers can use strategies to adapt to climate change

A new study led by Pennsylvania State University has found...

Many animal species exhibit behaviors that are linked to moon phases. A new study led by <a href="https://www.lsu.edu/">Louisiana State University</a> (LSU) and the <a href="https://www.ufl.edu/">University of Florida</a> is one of the first to investigate the connections between lunar phases and shark attacks. The findings suggest that more shark attacks occur during fuller phases of the moon.



The researchers analyzed a global shark attack record (<a href="https://www.floridamuseum.ufl.edu/shark-attacks/">The International Shark Attack File</a>) collected during over half a century (from 1960 to 2015) and discovered an unmistakable correlation between a large number of these attacks and periods with higher lunar illumination. However, it is not yet clear what the precise cause of this phenomenon is.&nbsp;



“It’s not a matter of more light at night for sharks to see. Most shark attacks occur in the daylight. However, the moon can exert other forces on Earth and its oceans in ways that are much more subtle—for example, the gravitation pull that we see affect the tides,” explained study co-author Steve Midway, an associate professor of Fisheries Ecology and Statistics at LSU.



According to Professor Midway and his colleagues, it is still too early to claim that lunar illumination is a causative factor for shark attacks. Since the relationship between moon phases and shark attacks may not be causal, scientists are not necessarily claiming that there are any immediate risk management benefits arising from these findings. Yet, the study contributes to a better understanding of shark behavior, which could help risk management in the future.



“Ultimately, moon phase and lunar illumination will not likely be a strong predictor that alone can forecast risk of shark attack. Local environmental variables are expected to continue to be more practical information for assessing risk.”&nbsp;



“However, the results here strongly support the idea that moon phase does play a role in overall risk of shark attack, and if future studies are able to consider local and regional environmental conditions along with lunar illumination, both understating shark attacks and forecasting risk may improve,” the authors concluded.



The study is published in the journal <a href="https://www.frontiersin.org/articles/10.3389/fmars.2021.745221/full">Frontiers in Marine Science</a>.



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By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Shark attacks linked to phases of the Moon

Many animal species exhibit behaviors that are linked to moon...

Eyes are important. They help <a href="https://www.earth.com/news/some-plants-wont-survive-the-loss-of-seed-dispersing-animals/">animals</a> find food and avoid becoming a meal themselves. Eyes also help animals scope out potential mates and watch out for rivals.&nbsp;



Looking into the eyes of a fossil can thus tell you a lot about how the creature once lived. Was the animal nocturnal or diurnal? An active hunter or shy and retiring? Unfortunately, however, eyes are rare fossils and scientists don’t often get an opportunity to look at them.&nbsp;



A research team spent years examining the eyes of a 95-million-year-old fossil crab,&nbsp;Callichimaera perplexa, found in the Colombian Andes. The crab was first described in 2019 by Harvard postdoctoral fellow Javier Luque. The fossil had preserved unusual elements of both the outer eye and internal structures.&nbsp;



In a new study led by Luque and scientists at Yale University, it is suggested that Callichomaera perplexa was a rare, active swimming predator. Much of this conclusion comes from examination of the eyes, which are quite large for those of an adult crab.&nbsp;



To make sure that they were in fact looking at an adult crab rather than an immature stage where eyes appear larger, Yale PhD candidate Kelsey Jenkins examined more than 1,000 crab specimens, both living and extinct. The research involved looking at crabs at different stages of development to finally determine that indeed, Callichomaera perplexa was an adult with exceptionally large eyes.&nbsp;&nbsp;&nbsp;



“Having such big and unprotected eyes implies that they were exposed at all times, plus eyes that big impose a huge investment of energy and resources to maintain them. Thus, this animal must have relied considerably on vision,” said Luque.



&nbsp;“If something has eyes this big, they're definitely very highly visual. This is in stark contrast to crabs with tiny, vestigial eyes where they may only be 1 to 3% of the animal's body size,” said Jenkins.



Further research showed that the crab had high visual acuity, comparable to other predators such as dragonflies and mantis shrimp. Its vision was adapted to high light environments, meaning the animal was probably most actively hunting during the day.&nbsp;



“Even though it’s the cutest, smallest crab, the big eyes of Callichimaera and its overall body form with unusually large oar-like legs indicate that it might have been a fierce, swimming predator, rather than a bottom-crawler as most crabs are,” said Luque.



Image Credit: Masato Hattori



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By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Secrets of a big-eyed crab fossil revealed

Eyes are important. They help animals find food and avoid...

species in Corambidae