The recent finding that pasteurized milk in the United States is no longer suspected of harboring the <a href="https://www.earth.com/news/deadly-bird-flu-outbreak-requires-urgent-coordinated-response/" target="_blank" rel="noreferrer noopener">H5N1 avian influenza</a> virus has alleviated some public health concerns. However, the persistence of the bird flu virus in the U.S. cattle population is alarming experts who fear that cattle could become a lasting reservoir for the virus. 



This scenario provides the virus with more opportunities to mutate and potentially jump to humans. Research indicates that the virus can be transmitted between birds and cows, suggesting it could disseminate across extensive geographic regions. 



<h2 class="wp-block-heading" id="h-detecting-bird-flu-in-cattle">Detecting bird flu in cattle</h2>



Unlike other mammals that succumb to the <a href="https://www.earth.com/news/bird-flu-is-killing-thousands-of-seals-and-sea-lions-globally/" target="_blank" rel="noreferrer noopener">virus</a>, most cows carrying the virus do not show severe symptoms or die, making it difficult to detect infected animals without specific testing. 



Additionally, a single cow might carry multiple flu viruses, raising the possibility of these viruses exchanging genetic material and creating new strains more capable of infecting humans.



“Eventually the wrong combination of gene segments and mutations inevitably comes along. Whatever opportunity we may have had to nip it in the bud we lost by a really slow detection,” said Michael Worobey, an evolutionary biologist at the <a href="https://www.arizona.edu/" target="_blank" rel="noreferrer noopener">University of Arizona</a>.



<h2 class="wp-block-heading" id="h-escalating-concerns-about-human-transmission-nbsp">Escalating concerns about human transmission&nbsp;</h2>



The virus is not new; different forms of H5N1 have been in circulation since the 1990s, with a particularly lethal variant identified in 1996. While this variant has decimated millions of birds and affected various <a href="https://www.earth.com/news/bird-flu-is-killing-thousands-of-seals-and-sea-lions-globally/" target="_blank" rel="noreferrer noopener">mammals</a>, cows were not previously recognized as hosts until recently. 



Following the discovery of H5N1 in U.S. cattle on March 25, with 36 herds in 9 states testing positive by May 7, concerns have escalated.



“Every time it gets a new mammalian host species, like cows, there’s more risk of human transmission and reduced human immunity,” said Jessica Leibler, an environmental epidemiologist at <a href="https://www.bu.edu/" target="_blank" rel="noreferrer noopener">Boston University</a>.



<h2 class="wp-block-heading" id="h-effective-mixing-vessels-nbsp">Effective mixing vessels&nbsp;</h2>



Genomic analysis by the <a href="https://www.usda.gov/" target="_blank" rel="noreferrer noopener">U.S. Department of Agriculture</a> suggests that the virus transitioned from wild birds to cattle in late 2023. Thus, cows appear to be “effective mixing vessels” where the virus can exchange genetic material with other viruses, significantly enhancing the risk of developing a strain that can efficiently infect humans.



“If you have a virus that’s hopscotching back and forth between cows, humans and birds, that virus is going to have selective pressures to grow efficiently in all those species,” said Angela Rasmussen, a virologist at the <a href="https://www.usask.ca/" target="_blank" rel="noreferrer noopener">University of Saskatchewan</a>.



<h2 class="wp-block-heading" id="h-will-bird-flu-become-endemic-in-cattle">Will bird flu become endemic in cattle?</h2>



Gregory Gray, an infectious-disease epidemiologist at the <a href="https://www.utexas.edu/" target="_blank" rel="noreferrer noopener">University of Texas</a>, pointed out the potential for H5N1 to become endemic in cows, a situation complicated by the impracticality of culling infected cattle. 



The constant interaction between humans and these vast numbers of animals makes cattle an extremely concerning reservoir for bird flu.



<h2 class="wp-block-heading" id="h-airborne-transmission-nbsp">Airborne transmission&nbsp;</h2>



The transmission mechanisms of the virus remain under investigation, with wild <a href="https://www.earth.com/news/deadly-bird-flu-outbreak-requires-urgent-coordinated-response/" target="_blank" rel="noreferrer noopener">birds</a> suspected as a primary vector. Concerns also exist about airborne transmission, which could explain the spread between dairy farms. 



Current regulatory measures include mandatory testing of cows before interstate transport, which helps researchers track the virus's spread but may not halt it. However, given the potential for airborne transmission, vaccinating cattle against H5N1 might become necessary.&nbsp;



<h2 class="wp-block-heading" id="h-what-is-the-risk-to-humans-nbsp">What is the risk to humans?&nbsp;</h2>



Current information on the transmission of the virus between humans is limited. A recent study published in the <a href="https://doi.org/10.3201/eid3007.240508%20(2024)" target="_blank" rel="noreferrer noopener">New England Journal of Medicine</a> on May 3rd confirmed that a dairy worker in Texas was infected, showing only mild symptoms. However, tests have not been conducted on others who live and work with this individual.



Although there have not been many reported deaths or severe cases among humans, suggesting that the virus may not be highly transmissible or lethal, exposure among farm workers may be quite common.&nbsp;



<h2 class="wp-block-heading" id="h-bird-flu-may-be-undetected-in-other-species">Bird flu may be undetected in other species</h2>



“When you see symptomatic patients, that’s the tip of the iceberg,” Liebler said. She fears that the <a href="https://www.earth.com/news/gentoo-penguins-are-the-latest-victims-of-bird-flu/" target="_blank" rel="noreferrer noopener">virus</a> could remain undetected in various species for an extended period, potentially mutating and setting the stage for a future <a href="https://www.earth.com/news/massive-global-failures-to-control-the-covid-pandemic/" target="_blank" rel="noreferrer noopener">pandemic</a>. “We have an awareness now from the COVID pandemic of how devastating that could be,” she added.



The experts are advocating for public health initiatives to commence testing on workers and their families to ensure any human transmission of the virus is promptly identified. “H5N1 is with us. It’s not a virus that’s going to disappear by any means,” Liebler concluded.



The continued presence of H5N1 in cattle poses significant risks, necessitating urgent and comprehensive measures to understand and mitigate its impact. As Leibler remarked, "H5N1 is with us. It’s not a virus that’s going to disappear by any means."



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Cattle may become a permanent host for bird flu

The recent finding that pasteurized milk in the United States is no longer suspected of harboring the H5N1 avian influenza virus has alleviated some public health concerns. However, the persistence of the bird flu virus in the U.S. cattle population is alarming experts who fear that cattle could become a lasting reservoir for the virus.  This scenario provides the virus with more opportunities to mutate and potentially jump to humans. Research indicates that the virus can be transmitted between birds and cows, suggesting it could disseminate across...

Speedbumps are helping to protect one of Africa's rarest primates, according to a new study from the <a href="https://www.wcs.org/">Wildlife Conservation Society</a>. The researchers found that there has been a drastic reduction in the number of deaths of red colobus monkeys after four speedbumps were installed along a stretch of road that the animals frequently cross. 

Red colobuses are Old World monkeys that are native to the forests of Unguja, the main island of Zanzibar. The monkeys are classified by the IUCN as endangered. 

For the study, the researchers assessed mortality from vehicle collisions - an increasing threat to primates living in fragmented habitats.

Around half of the Zanzibar red colobus population can be found in Jozani-Chwaka Bay National Park. Historical data from the road crossing through the park showed that one colobus was killed every two to three weeks by traffic. After speedbumps were installed, this number was reduced to one every six weeks.

"After the road at Jozani was surfaced but before the speedbumps were installed, a colobus was reported to have been killed every two to three weeks, resulting in perhaps about 12-17 percent annual mortality, according to one estimate," said study lead author Harry Olgun.

"The recent data show that speedbumps have made a huge difference for the safety of the colobus. Adding more speedbumps would help reduce the risk further."

According to the researchers, despite the great progress, the current mortality rate is still a significant threat to the species.  

"Cars are not selective in the animals they kill," noted study senior author Dr. Alexander Georgiev. "This means that while natural predators may target the very young and old more often, cars are equally likely to kill reproductively active young adults, who would contribute the most to population growth. And this may be a problem," 

Study co-author Dr. Tim Davenport is the director of Species Conservation &amp; Science in Africa at WCS. He led the first countrywide census of the Zanzibar red colobus a few years ago.

"As tourism grows in Zanzibar and habitat continues to shrink, using science to quantify and solve conservation problems has never been so important," said Dr. Davenport. "Understanding the impact of vehicles on wildlife within a park, and implementing practical solutions is exactly what we as conservationists should be doing."

The study is published in <a href="https://www.oryxthejournal.org/">Oryx - The International Journal of Conservation</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Speedbumps help protect endangered red colobus monkeys

Speedbumps are helping to protect one of Africa's rarest primates,...

Dogs get jealous at the mere thought of <a href="https://www.earth.com/news/arctic-plants-face-more-competition-for-pollinators-as-temperatures-rise/">competition</a> for their owner's affection, according to a new study from the <a href="https://www.psychologicalscience.org/">Association for Psychological Science</a>. 

Using a very realistic artificial dog, the researchers demonstrated that pet dogs exhibited jealous behaviors when they imagined their owner was interacting with a rival. 

In surveys, more than 80 percent of dog owners report that when when they give attention to other dogs, their pets display jealousy through vocalizations, pulling on their leash, or other agitated behaviors.

"Research has supported what many dog owners firmly believe - dogs exhibit jealous behavior when their human companion interacts with a potential rival," said study lead author Amalia Bastos of the University of Auckland. 

"We wanted to study this behavior more fully to determine if dogs could, like humans, mentally represent a situation that evoked jealousy."

Among humans, jealousy is closely linked with self-awareness. This is one reason that animal cognition scientists, who study the mental capacities of non-human animals, are interested in studying emotions such as jealousy. 

Dogs appear to display jealous behaviors similar to how a human child responds when their mother gives affection to another child. 

For the investigation, the researchers observed 18 dogs under conditions in which they could imagine a social interaction between their human companion and either a realistic fake dog or a fleece cylinder. The fake dog served as a potential rival for attention, while the fleece cylinder served as a control.

The experiment was designed so that the dogs could observe the artificial dog positioned next to their owner before a barrier was put in place to obscure their view. 

When the dogs thought their owners may be petting the artificial dogs, they forcefully pulled on their leash in an attempt to reach the other side of the barrier. The dogs had much less of a response when they observed their owners with a fleece cylinder.

"These results support claims that dogs display jealous behavior. They also provide the first evidence that dogs can mentally represent jealousy-inducing social interactions," said Bastos. 

"Previous studies confounded jealous behavior with play, interest, or aggression, because they never tested the dogs' reactions to the owner and the social rival being present in the same room but not interacting."

"There is still plenty of work to do to establish the extent of the similarities between the minds of humans and other animals, especially in terms of understanding the nature of nonhuman animals' emotional experiences."

According to Bastos, it is too early to say whether dogs experience jealousy as humans do, but it is now clear that they react to jealousy-inducing situations, even when those situations occur out of sight. 

The study is published in the journal <a href="https://journals.sagepub.com/home/pss">Psychological Science</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

Dogs appear to get jealous over their owner's affection

Dogs get jealous at the mere thought of competition for...

Each year, thousands of juvenile loggerhead turtles set out on a journey across the Pacific Ocean from Japan to Baja California, where they feed on red crabs. Little is known about this <a href="https://www.earth.com/news/study-of-peregrine-falcons-suggests-birds-have-a-migration-gene/">migration</a>, which involves thousands of miles and as much as two decades or longer. 

An international team of scientists led by <a href="https://www.stanford.edu/">Stanford University</a> has discovered new details about the epic migrations of loggerhead turtles. They have found evidence that intermittent passages of warm water allow sea turtles to cross inhospitably cold ocean barriers. 

The findings could help inform conservation measures to protect sea turtles and other migratory marine animals. 

"For decades, our ability to connect the migratory dots for this endangered species has remained elusive," said study lead author Dana Briscoe.

"This work builds on the backbone of exceptional research about these 'lost years,' and for the first time ever we are excited to provide evidence of a 'thermal corridor' to explain a longstanding mystery of one of the ocean's greatest migrants."

Six of the seven sea turtle species are listed by the IUCN as vulnerable, endangered, or critically endangered.

The researchers set out to understand why some loggerhead turtles travel to the western coast of North America while others remain in the central Pacific Ocean. In addition, they wanted to know how sea turtles can cross a frigid zone called the Eastern Pacific Barrier when they are extremely sensitive to temperature.

To investigate, the experts created the largest dataset on satellite-tagged loggerhead sea turtles ever compiled. They used sophisticated remote sensing techniques and collected one of the first detailed records of sea turtle aging and stable isotope testing. The research was built upon decades of research by the team.

The researchers identified a "thermal corridor" from unusually warm sea surface temperatures that allowed the turtles to cross the Eastern Pacific Barrier to coastal foraging grounds.

The experts report that the corridor was present during the late spring and summer, and was preceded by early ocean warming in the months before it opened. Warming conditions may provide key environmental cues to sea turtles that the thermal corridor is opening. 

As global warming continues, locations that were once impassable, like the Eastern Pacific Barrier, will open up to various species. This will increasingly shift the distribution and migratory patterns of creatures ranging from sea birds to white sharks, which will present new challenges. For example, loggerhead turtles could become more frequent victims of bycatch. 

"Understanding how and why species like the North Pacific loggerhead move among habitats is crucial to helping them navigate threats," said study senior author Professor Larry Crowder. "Emerging technologies and analyses can help illuminate these journeys."

The study is published in the journal <a href="https://www.frontiersin.org/journals/marine-science">Frontiers in Marine Science</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Loggerhead turtles migrate using a secret thermal corridor

Each year, thousands of juvenile loggerhead turtles set out on...

Rhesus macaques living on Cayo Santiago Island in Puerto Rico were drawn closer together by a natural disaster, according to a new study published by <a href="https://www.cell.com/">Cell Press</a>. 

After Hurricane Maria, a devastating <a href="https://www.earth.com/news/storms-in-alaska-will-become-much-more-frequent-and-severe/">storm</a> that killed than 3,000 people, the macaques became more tolerant of each other and sought new social connections. 

The researchers studied social connections among the macaques before and after Hurricane Maria. 

"The macaques built new relationships rather than strengthening existing ones and tended to adopt a 'path of least resistance' to forming new connections," said study first author Camille Testard, who is a PhD candidate at the University of Pennsylvania. 

"These findings are consistent with a strategy to gain tolerance and support from the greatest number of individuals and benefit from broader social integration rather than focusing on reinforcing relationships to key partners." 

"This increased tolerance toward others, including strangers, has also been observed in humans following catastrophic events that impact whole populations widely."

Rhesus macaques are sociable animals, but they are constantly competing for dominance and can be very aggressive to other members of their group.

The researchers were already studying macaques in the field when Hurricane Maria hit Puerto Rico. In the aftermath of the storm, the experts noticed that the animals suddenly seemed more tolerant of each other, and even of past competitors.

A social network analysis confirmed that the shift had taken place. The macaques had forged new social connections after the storm, resulting in a more tolerant society as a whole.

"We expected the monkeys would use their closest allies to cope with the ecological devastation of the hurricane and so would invest in their existing relationships," said study co-senior author Lauren Brent. "Instead, the macaques expanded their social networks and the number of individuals that they tolerated sharing limited resources, like a shady space to sit."

According to the researchers, their findings in Puerto Rico help to answer an outstanding question about what benefits social relationships provide. In future work, they plan to investigate the long-term effects of making new social connections, or failing to do so, in this extreme context. 

"Social relationships have a surprisingly large impact on human health and being in a poor social environment is a high risk factor for humans - remarkably, as high as other health risk factors such as smoking," said study co-author James Higham of New York University. 

"How variation in the social environment gets under the skin and impacts our biology remains unclear. Our work on the impacts of changes in sociality following a natural disaster adds yet another element to this complex dynamic."

The study is published in the journal <a href="https://www.cell.com/current-biology/home">Current Biology</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Rhesus macaques were drawn closer together after Hurricane Maria

Rhesus macaques living on Cayo Santiago Island in Puerto Rico...

In a new study published by <a href="https://www.frontiersin.org/">Frontiers</a>, experts have discovered that bacteria in the gut of a horse communicate with cells to promote energy efficiency. The gut bacteria send chemical signals to the cells to regulate energy metabolism, ultimately improving the horse's athletic performance. 

"We are one of the first to demonstrate that certain types of equine gut bacteria produce chemical signals that communicate with the mitochondria in the horse's cells that regulate and generate energy," said study lead author Eric Barrey of the National Research Institute for Agriculture, Food, and Environment in France. 

"We believe that metabolites - small molecules created by breaking down bigger molecules for food or growth - produced by these bacteria have the effect of delaying low blood sugar and inflammation in the cells, which in turn extends the horse's athletic performance."

&nbsp;

Recent studies have shown that mitochondria, which generate large amounts of energy within cells, are interdependent with gut bacteria. Researchers have also linked many diseases associated with mitochondrial dysfunction, such as Parkinson's and Crohn's, to changes in the gut microbiome.

Study first author Dr. Nuria Mach is an expert at the National Research Institute for Agriculture, Food and Environment in France.

"Studying horses is a good way to assess the link between gut bacteria and mitochondria, because the level of exercise, and thereby mitochondrial function, performed by a horse during an endurance race is similar to that of a human marathon runner," explained Dr. Mach.

"For this study we gained permission for veterinary doctors to take blood samples from 20 healthy horses of similar age and performance level, at the start and end of the International Endurance Competition of Fontainebleau, an 8-hour horse race in France." 

"These samples provided information about the chemical signals and expression of specific genes, which is the process by which DNA is converted into instructions for making proteins or other molecules. To understand the composition of the horse's gut bacteria metabolites, we obtained fecal samples at the start of the race."

The researchers found that certain bacteria in the gut were linked to gene expression through mitochondria, and the genes that were "turned on" were associated with metabolism.

"Interestingly, mitochondria have a bacterial origin - it is thought they formed a symbiotic relationship with other components to form the first cell," said Barrey. "This may explain why mitochondria have this line of communication with gut bacteria."

"Improving our understanding of the intercommunication between the horse and the gut microbiome could help enhance their individual performance, as well as the method by which they are trained and dietary composition intake," said Dr. Mach. 

"Manipulating the gut microbiota with probiotic supplements as well as prebiotics, to feed the good bacteria, could be a way for increasing the health and balance of the microbiome and horses, to better sustain endurance exercise."

The study is published in the journal <a href="https://www.frontiersin.org/journals/molecular-biosciences">Frontiers in Molecular Biosciences</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Horse's gut bacteria "talk" to cells to regulate energy

In a new study published by Frontiers, experts have discovered...

In a new study published by the <a href="https://www.britishecologicalsociety.org/">British Ecological Society</a>, experts warn that there is much uncertainty regarding how mammals will respond to <a href="https://www.earth.com/news/climate-change-has-cut-agricultural-productivity-by-21-percent/">climate</a> change, especially in regions that are the most vulnerable. 

While it is known that nearly 25 percent of mammal species are threatened with extinction, the threats associated with climate change are complex and not well understood. This is because different environmental changes have multiple effects on the lives of animals, including survival and reproduction.

The current study, conducted by an international team of researchers from 15 institutions, has found that most research on terrestrial mammals has not investigated the full range of effects brought on by climate change.

Out of the 5,728 terrestrial mammal species reviewed by the researchers, only 106 studies were found that examined both survival and reproduction at the same time. These studies involved only 87 species, or less than one percent of all terrestrial mammals.

"Researchers often publish results on the effects of climate on survival or on reproduction - and not both. But only in rare cases does a climatic variable (say, temperature) consistently negatively or positively affect all studied rates of survival and reproduction." said study lead author Dr. Maria Paniw of the University of Zurich.

For example, hotter temperatures may decrease the number of offspring, but if those offspring have less competition they also have a better chance of survival. In this case, the population size would not necessarily be affected. 

However, if higher temperatures decrease both reproduction and survival, the potential impacts on a group of mammals would be underestimated.

The study also revealed that experts have learned very little about the potential climate impacts on mammals in the most vulnerable regions of the world. 

"We were surprised by the lack of data on high-altitude (alpine) mammals. Climate change is expected to be very pronounced in higher elevations." said Dr Paniw. 

"In our review, we had a few alpine species, such as yellow-bellied marmots and plateau pikas, but I was expecting a study or two on iconic species such as snow leopards.

"To inform evidence-based conservation, we need to prioritize more holistic approaches in data collection and integration to understand the mechanisms that drive population persistence."

"There are many reasons why this data isn't being captured. An important aspect is that collecting such data requires long-term investment without immediate returns, which has not been favored by many funding agencies and is also logistically challenging. These challenges are compounded in climate-vulnerable regions, which include many countries with underfunded infrastructure for long-term ecological research."

The researchers plan to conduct similar reviews on animal groups that are not as well-studied as mammals, such insects and amphibians. 

"I would like to foster collaborations that will jumpstart new research and 'repurpose' existing data in climate-vulnerable areas of the globe to fill the knowledge gaps we identified in our work," said Dr. Paniw.

The study is published in the <a href="https://besjournals.onlinelibrary.wiley.com/journal/13652656">Journal of Animal Ecology</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

It remains unclear which mammals can survive climate change

In a new study published by the British Ecological Society,...

Male baboons who achieve a high social rank do not live as long as males with lower social status, according to a new study from <a href="https://duke.edu/">Duke University</a>. The experts found <a href="https://www.earth.com/news/epigenetic-passed-future-generations/">epigenetic</a> marks associated with a struggle for dominance that speed up aging.

Using blood samples collected from 245 wild baboons in Kenya, the researchers examined chemical genetic modifications known as DNA methylation marks.

"Environmental stressors can make the clock tick faster, so that some individuals appear biologically older than their actual age and experience a higher risk of age-related disease," explained study co-first author Jordan Anderson.

"We sought to answer what social or early life experiences contribute to accelerated aging in baboons."

Methylation marks are found throughout the entire genome. The team measured about 400,000 of these sites and then narrowed that number down to about 500 sites which best predicted age.

Surprisingly, adversity in early life did not affect the rate of aging among male baboons. The strongest relevant factor was found to be social status. 

"Male baboons who compete successfully for high social status appear to age faster," said study senior author Professor Jenny Tung. "We repeatedly sampled some of these males and were able to show that the clock can speed up or slow down as males move up or down the social ladder."

Higher body mass index, which is associated with having more lean muscle mass in baboons, was also associated with accelerated aging. This is likely because of the physical demands that come along with maintaining high social status. 

The researchers found that aging speeds up as the animals climb the social ladder. By contrast, if a male drops in social status, there is a corresponding drop in his rate of aging.

The study authors explained that the reason the baboons work so hard to achieve a high-stress social status is for the sake of having offspring.

"If male baboons are going to have babies, they need to achieve high rank," said Professor Tung. "They will have very little chance to leave offspring if they don't achieve high rank, which creates a powerful evolutionary motivation."

"While the findings reveal how social pressures can influence aging for males, we don't see the same effect of rank in female baboons, who are born into their social rank rather than having to fight for it."

"Our results have important implications for research on the social determinants of health in humans and other animals because they show that 'high status' can mean very different things in different contexts. They also highlight the importance of examining the effects of both early life and current life environments on biological aging."

The study is published in the journal <a href="https://elifesciences.org/">eLife</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Male baboons age faster as they climb the social ladder

Male baboons who achieve a high social rank do not...

Scientists are seeking inspiration from plants and animals to create medical implants with antibacterial surfaces. The wings of insects and other natural surfaces have evolved the ability to kill bacteria on contact, and the experts hope these remarkable features can translate into healthcare materials.

In a new study from <a href="https://publishing.aip.org/">AIP Publishing</a>, an interdisciplinary team of researchers has turned its attention to surfaces like dragonfly wings and lotus leaves that have natural antibacterial properties to optimize medical implants.

"Objects in nature have such unique features, like spikes sharper than a bacterium, which give them the power of disturbing and killing a bacterium, making them antibacterial," said study co-author Saurav Goel of London South Bank University. "We can make these features with our ultraprecision engineering instruments."

Many studies have identified various mechanisms by which natural surfaces kill bacteria, including chemical reactions, the roughness of the surface, or the ability of bacteria to rest on the surface. However, the commercial exploitation of these discoveries has been virtually nonexistent. 

According to the researchers, the lack of real-world application is partially due to the need for suitable manufacturing techniques that can produce these nature-inspired features with controlled accuracy on a large scale. Goel describes this as one of the major puzzles faced by 21st-century applied physics.

The experts are developing a new laser-based technique that can modify the surface properties of a material by manufacturing the desired features in a freeform manner based on 3D computer models.

Once the new technique is fully developed and refined, the researchers plan to create a prototype of an implant with an antibacterial surface.

"The end goal is a prosthesis that I can implant with clinical evidence that it kills bacteria and reduces the infection rate," said study co-author Oliver Pearce of Milton Keynes University Hospital in Buckinghamshire, England.

The vast majority of infections associated with implants are caused by staphylococci and streptococci. Eradicating their effect would reduce infections by up to 90 percent, according to the study authors. The technology would be applicable to prosthetics in all parts of the body.

"It's simplistic to have an advanced surface that kills bacteria and to say that the infection problem is eradicated," said Pearce. "It won't eliminate all infections, but in my mind, it will make the rate significantly lower."

The study is published in the journal <a href="https://aip.scitation.org/journal/are">Applied Physics Reviews</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Dragonfly wings inspire antibacterial medical implants

Scientists are seeking inspiration from plants and animals to create...

Seafood is lacking in nutrients in ecosystems where the number of species have been reduced by overfishing, pollution, or climate change, according to a new study from <a href="https://www.yale.edu/">Yale University</a>. 

On the other hand, the experts report that high levels of biodiversity in marine environments supply a wide range of vitamins, minerals, and fatty acids to seafood.

Study co-author Joey Bernhardt is a G. Evelyn Hutchinson postdoctoral fellow in the Department of Ecology and Evolutionary Biology. He said that the research showed that biodiversity is crucial to human health.

The experts said that while humans can achieve their protein requirements with seafood from less-diverse systems, meeting their need for key nutrients such as calcium, iron, and zinc requires high levels of biodiversity. 

According to Bernhardt, seafood sourced from biodiverse ecosystems can help combat a phenomenon known as "hidden hunger," in which people have access to enough calories, but not enough micronutrients.

The impacts of low marine biodiversity on human health are especially pronounced in coastal populations that are heavily dependent on seafood in their diets.

In collaboration with study co-author Mary I. O'Connor of the University of British Columbia, Bernhardt analyzed more than 7,000 nutrient samples from 801 marine and freshwater finfish and invertebrates. 

The analysis revealed that different species have distinct and complementary nutrient profiles. There was little difference in the protein content among the marine species, but concentrations of micronutrients - such as iron, calcium and essential fatty acids - varied significantly.

The findings highlight the importance of monitoring and preserving biodiversity in changing aquatic ecosystems across the globe, noted the study authors.

"While we have known that biodiversity on land is important for benefits such as forest production, this study provides new evidence that the benefits of biodiversity in oceans and freshwaters are as great as on land," said Bernhardt. 

"Ecological concepts of biodiversity can deepen our understanding of nature's benefits to people and unite sustainability goals for biodiversity and human well-being."

The study is published in the journal <a href="https://www.pnas.org/">Proceedings of the National Academy of Sciences</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

Biodiversity supports healthier seafood

Seafood is lacking in nutrients in ecosystems where the number...

A new study from the <a href="https://www.caryinstitute.org/">Cary Institute of Ecosystem Studies</a> describes how wildlife diversity helps to protect human health. The experts report that restoring and preserving nature is critical for preventing future pandemics. 

The researchers note that a growing collection of evidence suggests that biodiversity loss increases our exposure to both new and established zoonotic pathogens.

"There's a persistent myth that wild areas with high levels of biodiversity are hotspots for disease. More animal diversity must equal more dangerous pathogens. But this turns out to be wrong. Biodiversity isn't a threat to us, it's actually protecting us from the species most likely to make us sick," explained study lead author Professor Felicia Keesing.

Zoonotic diseases like COVID-19 and Ebola are caused by pathogens that can jump from animals to humans. However, animal species vary in their ability to pass along infectious pathogens.

"Research is mounting that species that thrive in developed and degraded landscapes are often much more efficient at harboring pathogens and transmitting them to people," said study co-author and disease ecologist Rick Ostfeld.

"In less-disturbed landscapes with more animal diversity, these risky reservoirs are less abundant and biodiversity has a protective effect."

The mammals that are mostly likely to pass along infectious pathogens to humans include rodents, bats, primates, and carnivores. "The next emerging pathogen is far more likely to come from a rat than a rhino," said the researchers. 

This is because animals with fast life histories tend to be more efficient at transmitting pathogens, explained Professor Keesing, 

"Animals that live fast, die young, and have early sexual maturity with lots of offspring tend to invest less in their adaptive immune responses. They are often better at transmitting diseases, compared to longer-lived animals with stronger adaptive immunity."

As biodiversity is lost in an ecosystem, smaller species that live fast and die young tend to be more successful. Previous studies have shown that human development typically increases the abundance of zoonotic host species, bringing people and risky animals closer together.

"When we erode biodiversity, we favor species that are more likely to be zoonotic hosts, increasing our risk of spillover events," said Ostfeld. "Managing this risk will require a better understanding of how things like habitat conversion, climate change, and overharvesting affect zoonotic hosts, and how restoring biodiversity to degraded areas might reduce their abundance."

"Restoration of biodiversity is an important frontier in the management of zoonotic disease risk. Those pathogens that do spill over to infect humans - zoonotic pathogens - often proliferate as a result of human impacts," said Professor Keesing.

"As we rebuild our communities after COVID-19, we need to have firmly in mind that one of our best strategies to prevent future pandemics is to protect, preserve, and restore biodiversity."

The study is published in the journal <a href="https://www.pnas.org/">Proceedings of the National Academy of Sciences</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

Preserving nature is key for preventing future pandemics

A new study from the Cary Institute of Ecosystem Studies...

Researchers at <a href="https://english.tau.ac.il/">Tel Aviv University</a> are describing a potential new defense mechanism that fireflies use to protect themselves from <a href="https://www.earth.com/video/male-bats-have-a-secret-mating-weapon/">bats</a>. The experts have discovered that fireflies seem to create a "musical shield" to deter bats from attacking them. 

According to the study, fireflies produce strong ultrasonic sounds that are inaudible to the human ear, as well as to the insects themselves.  The researchers theorize that the ultrasonic sounds are meant for the ears of bats to keep them away.

The light flashes used by fireflies for mating also serve as a warning to potential predators that they are poisonous. However, bats have poor vision, which means that a flashing light would have little effect on them. 

Since bats are among the fireflies' most prevalent predators, the researchers believe the insects may have developed an alternative defense mechanism. 

Professor Yossi Yovel explained that the idea for this study came up accidentally, during a study that tracked bats' echolocation. 

"We were wandering around a tropical forest with microphones capable of recording bats' high frequencies, when suddenly, we detected unfamiliar sounds at similar frequencies, coming from fireflies," said Professor Yovel.

Study lead author and PhD student Ksenia Krivoruchku explained that the analysis of high-speed video footage revealed that the fireflies produce the sounds by moving their wings, and that the fireflies themselves cannot hear this frequency. "Consequently we hypothesized that the sound is not intended for any internal communication within the species," said Krivoruchku.

The researchers examined three different species of fireflies that are commonly found in Vietnam. They confirmed that all of the species produce the unique ultrasonic sounds, yet cannot hear them.

Professor Yovel explained that the study did not conclusively determine that fireflies have developed the special defense mechanism specifically for bats. At the same time, there are several findings that point to this conclusion. 

For example, the fact that the fireflies cannot hear the sounds themselves, while bats can both hear and use them to locate the insects, indicates that the noise is likely produced as a warning signal. 

Krivoruochku noted that the discovery that fireflies use ultrasonic sounds is, in itself, an important contribution to the study of predator-prey relations. 

"The idea of warning signals that the sender itself cannot detect is known from the world of plants but is quite rare among animals," said Krivoruchku.

"Our discovery of the 'musical battle' between fireflies and bats may pave the way for further research, and possibly the discovery of a new defense mechanism developed by animals against potential predators."

The study is published in the journal <a href="https://www.cell.com/iscience/home">iScience</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

Study hints at a secret "musical battle" between fireflies and bats

Researchers at Tel Aviv University are describing a potential new...

The environment in which humans and <a href="https://www.earth.com/news/dogs-help-children-improve-their-confidence-and-social-skills/">dogs</a> live has an effect on their reproductive health, according to a new study from the <a href="https://www.nottingham.ac.uk/">University of Nottingham</a>.

The researchers analyzed the link between geographical location and polluting chemicals present in dog testes, some of which are known to affect reproductive health. 

"In humans and dogs, a temporal decline in semen quality and increased incidence of testicular cancer is hypothesised to be associated with exposure to anthropogenic chemicals, particularly during fetal development," wrote the researchers.

"Human studies suggest that differential exposures to environmental chemicals may be associated with geographical differences in male reproductive health."

The experts chose to focus their study on dogs because they share the same environment as people and are effectively exposed to the same household chemicals as their owners.

The investigation revealed that the chemicals present, as well as any abnormalities in the testes, were different depending on where the dogs lived. 

"For the first time, we have shown that the profile of chemical pollutants found in dog testes depends on where they are from," said study lead author Dr. Rebecca Sumner.

"We have also shown that the same cohorts of dog testes also show geographic differences in testicular pathology and evidence of an imbalance in cells that are important for sperm production."

The researchers noted that for more than seven decades, the potential effects of anthropogenic chemicals on human male fertility have been of significant concern. 

"A series of widely cited meta-analyses have reported a temporal decline in human male semen quality and, over the same period, both increased incidences of testicular germ cell cancer in younger men and malformations of babies at birth have been reported," wrote the study authors. 

"This has led to the hypothesis that these abnormalities are linked to exposure to chemical pollutants and that these developmental and functional abnormalities have the same environmental origin."

Professor Gary England said the current study is of pivotal importance because it used dogs as a sentinel species for humans to focus directly on the testis, where chemicals are likely to influence male reproductive function.

"This work is significant since collectively, these findings indicate that environmental exposures are determined by location and this may underpin regional differences in male reproductive health."

The study is published in the journal <a href="https://www.nature.com/srep/">Scientific Reports</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

Reproductive health is impacted by geographic location

The environment in which humans and dogs live has an...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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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

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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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

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How does salt makes things taste better?

[sendtonews key="X0f6OHYoI4-2310561-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Santiago, Chile in South America

[sendtonews key="JRaP49ISmm-2357509-12187" type="single"] Today’s Video of the Day from the...

Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Interactive map of the universe includes 200,000 galaxies

[sendtonews key="e4ZG0Jawp3-2374785-12187" type="single"] Astronomers at Johns Hopkins University have created...

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Lesotho: Africa's "Kingdom in the Sky" Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features northwest Lesotho in South Africa.



According to ESA, Lesotho is the only nation in the world that lies completely above 1,000 m in elevation. The country is famous for its tall mountains and narrow valleys, and is known as Africa's "Kingdom in the Sky."



Out of a population of around two million people, about 80 percent live in rural areas. More than 75 percent of these people are engaged in <a href="https://www.earth.com/news/climate-change-will-have-a-global-impact-on-agriculture/">agriculture</a>, including rainfed cereal production and animal grazing.&nbsp;



ESA reports that the country’s agricultural system faces a growing number of issues, with climate-related vulnerabilities such as drought, floods and extreme temperatures occurring more frequently. 



Diamonds are amongst the minerals found in the mountains. Indeed, Lesotho can truly be called the Kingdom in the Sky. Beautiful, culturally rich, safe, affordable, and easily accessible from Durban and Johannesburg, mountainous Lesotho is a vastly underrated travel destination. the Kingdom of Lesotho (Sotho: 'Muso oa Lesotho) is an enclaved country in southern Africa. It is just over 30,000 km2 (11,583 sq mi) in size and has a population of around 2 million.



Video Credit: ESA&nbsp;&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Lesotho: Africa's "Kingdom in the Sky"

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The city of Dublin on Ireland's east coast

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The province of Zaragoza in northeast Spain

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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



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The rapid retreat of the Columbia Glacier

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The Pyrenees Mountains in southwest Europe

[sendtonews key="6HyfrAJTBI-1831843-12187" type="single"] Today’s Video of the Day from the...

Earth,Like,Exoplanet,3d,Render

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “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.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“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.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> is focused on the melt ponds that emerge during the spring and summer on the Greenland Ice Sheet, which is the largest ice mass in the northern hemisphere.



"Melt ponds are vast pools of open water that form on both sea ice and ice sheets and are visible as turquoise-blue pools of water in this Copernicus Sentinel-2 image," says ESA.



"When snow and ice melts atop glaciers, water flows in channels and streams and collects in depressions on the surface. These melt ponds can speed up the melting of the surrounding ice since they greatly reduce the ice’s ability to reflect sunlight."



"This can create a positive feedback where an increasing number of melt ponds absorb more heat which causes ice cover to melt even faster."



According to ESA, Greenland has been hit with a late-season heatwave that began in early September. This caused the type of melt event that usually occurs in the middle of summer.



"In a recent paper published in Nature Climate Change, scientists found that major sea-level rise from the melting of the Greenland ice cap is now ‘inevitable’ even if the burning of fossil fuels were to halt overnight," says ESA. "Using satellite observations of Greenland ice loss and ice cap from 2000 to 2019, the team found the losses will lead to a minimum rise of 27 cm regardless of climate change."



Video Credit: ESA&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Melt ponds on the Greenland Ice Sheet

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes a new map of Mars that is providing insight into the planet’s watery past. The map also reveals where future missions could safely land on Mars.&nbsp;



The map has been created over the last decade using observations of water-rich rocks and mineral deposits. The images were captured by ESA’s Mars Express and NASA’s Mars Reconnaissance Orbiter.



"A big surprise is the prevalence of these minerals, with the map revealing hundreds of thousands of water-affected locations in the oldest parts of the planet," says ESA. "The new data will help answer exciting questions about Mars’ climate history, whether water was globally persistent or confined to short, intense episodes, and whether the conditions were ever suitable for life."



"Specifically, the map shows the locations and abundances of aqueous minerals. These are from rocks that have been chemically altered by the action of water in the past, and have typically been transformed into clays and salts."



According to John Carter of the Institut d’Astrophysique Spatiale (IAS), our collective understanding of Mars has been oversimplified. He explained that planetary scientists have tended to think that only a few types of clay minerals on Mars were created during its wet period, then as the water gradually dried up, salts were produced across the planet.



The new map shows that the composition of Mars is much more complicated than what we thought. For example, while many salts formed after Martian clays, there are some salts that are presumed to be older than some of the clays.&nbsp;



“The evolution from lots of water to no water is not as clear cut as we thought, the water didn’t just stop overnight. We see a huge diversity of geological contexts, so that no one process or simple timeline can explain the evolution of the mineralogy of Mars. That’s the first result of our study. The second is that if you exclude life processes on Earth, Mars exhibits a diversity of mineralogy in geological settings just as Earth does,” said Carter.



Video Credit: ESA



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The history of Mars is much more complex than we thought

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Today's Video of the Day from the <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes how cavefish adapted to a sedentary lifestyle over tens of thousands of years. 



The experts found that the muscle metabolism of cavefish has been genetically reprogrammed over time. As a result, the animals have experienced major changes in their morphology and behavior. Despite these changes, however, the cavefish remain healthy and fit.



The research may provide new clues about the evolutionary consequences of prolonged physical inactivity in humans.&nbsp;



“It’s no surprise that people are moving less and less as technology has advanced,” said Rohner. “With cavefish, we have a unique system where we can study what might happen if people remained couch potatoes over very, very long periods of time.”



Video Credit: Stowers Institute for Medical Research



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Cavefish are healthy despite their sedentary lifestyle

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> some of the most incredible waves in the world, as seen by Landsat satellites.



"With more than 370,000 miles of coastline on Earth, there are plenty of places where epic waves build up, curl over, and hurtle toward the shore.- much to the thrill of surfers," says NASA. "There are some places where these waves are so magnificent that they can be seen from space."



"With the broad perspective of satellites, we can see how these iconic waves develop into the world’s tallest, longest, fastest, and heaviest."



Video Credit: NASA Earth Observatory&nbsp;



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



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites capture the world's biggest and fastest waves

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes why satellite images and measurements of our planet have become "essential to our survival, offering a new outlook of our world."&nbsp;



Rising sea levels pose one of the biggest societal threats associated with climate change. According to ESA, satellite altimeter missions such as Copernicus Sentinel-6 are essential in monitoring global and regional changes in sea level.



"Unbeknown to many, the island of Crete, Greece, plays an important role in the Copernicus satellite altimetry constellation and on an international stage," reports ESA.



"Satellite altimetry data have to be continuously monitored at the ESA’s Permanent Facility for Altimetry Calibration where different techniques have pioneered the use of transponders to provide the best measurements to validate satellite altimeters in space soon after launch."



Dr. Craig Donlon explains that, by understanding planet Earth through satellite measurements, we are able to find evidence of change.&nbsp;



Video Credit: European Space Agency&nbsp;



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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

Satellites have become essential to our survival

[sendtonews key="761m2QQvR1-2035772-12187" type="single"] Today’s Video of the Day from the...