Every living organism relies on a genetic blueprint encoded in its DNA, yet the amount of DNA - or genome size - varies dramatically across the tree of life.&nbsp;



In animals alone, genome sizes range from the minuscule genome of Intoshia variabili, a marine parasite - which is about 200 times smaller than the human genome - to the massive genome of the marbled lungfish (Protopterus aethiopicus) - which is over 40 times larger than ours.&nbsp;



Plants exhibit a similar range, with the fork fern (Tmesipteris oblanceolata) setting the record with a genome size over 50 times larger than that of humans.



This diversity in <a href="https://www.earth.com/news/genome-mapping-completed-for-dozens-of-common-animals/" target="_blank" rel="noreferrer noopener">genome</a> size reveals the vast variety of life forms on Earth, but it also raises a fascinating question: If smaller genomes lead to faster, more efficient growth, why do some species have larger genomes?



<h2 class="wp-block-heading" id="h-advantages-of-smaller-genome-sizes">Advantages of smaller genome sizes</h2>



The replication of DNA is essential for cell production and growth, making smaller genomes more efficient as they require fewer resources and time to replicate.&nbsp;



Smaller genomes demand fewer <a href="https://www.earth.com/news/excess-nutrients-are-creating-ocean-dead-zones/" target="_blank" rel="noreferrer noopener">nutrients</a>, especially the DNA-building elements nitrogen and phosphorus, making them ideal for rapid growth and reproduction.



Because of these advantages, it’s not surprising that most species have evolved with relatively small genomes.&nbsp;



However, large genomes persist in some organisms, suggesting that these genomes may confer certain benefits in specific environments, where the costs of carrying extra DNA are outweighed by unique growth advantages.



<h2 class="wp-block-heading" id="h-exploring-large-genome-benefits-in-grasses">Exploring large genome benefits in grasses</h2>



A research team led by the <a href="https://www.sheffield.ac.uk/" target="_blank" rel="noreferrer noopener">University of Sheffield</a> has recently studied the potential benefits of large genomes in grass species. 



<a href="https://www.earth.com/news/fairy-circles-kill-all-newly-planted-grasses-deepening-their-mystery/">Grasses</a>, a vast plant family found worldwide from arctic tundras to tropical savannas, vary in genome size, making them an ideal group to examine how genome size affects growth in different conditions.



The study, published in the journal <a href="https://doi.org/10.1111/nph.20150" target="_blank" rel="noreferrer noopener">New Phytologist</a>, examined the growth of various grass species under conditions mimicking their natural environments - high temperatures, low nutrients, and drought. 



The scientists compared growth rates to each species’ genome size and observed that while grasses with smaller genomes generally grew better across most conditions, larger genomes provided advantages in two specific scenarios.



<h2 class="wp-block-heading" id="h-large-genomes-thrive-in-nutrient-rich-environments">Large genomes thrive in nutrient-rich environments</h2>



The first scenario where larger genomes proved beneficial was in nutrient-rich soils. While low nutrient levels slowed down large-genome grasses, those with large genomes thrived in high-nutrient environments.&nbsp;



Here, the extra DNA content meant larger cells that produced more biomass, such as leaves, which allowed these plants to outgrow and overshadow neighbors with smaller genomes.&nbsp;



In nutrient-poor areas, however, the demands of replicating additional DNA outweighed these benefits, making smaller genomes more favorable.



<h2 class="wp-block-heading" id="h-growing-seasons-and-genome-sizes">Growing seasons and genome sizes</h2>



The second advantage for large-genome grasses occurred in cooler environments, such as temperate regions with lower growing season temperatures.&nbsp;



<a href="https://www.earth.com/news/how-do-plants-grow-more-branches-and-become-bushy/" target="_blank" rel="noreferrer noopener">Plant growth</a> typically has two stages: cell division, where new cells are generated, and cell expansion, where cells swell with water to help the plant grow taller or spread. 



Cool temperatures significantly slow down cell division, but they have less impact on cell expansion.&nbsp;



Consequently, grasses with larger cells, which accompany large genomes, can expand more rapidly by cell enlargement even in cooler weather, outpacing smaller-genome plants that rely on faster cell division in warmer temperatures.



This cell expansion process explains the early spring growth of plants like daffodils and bluebells, which also have large genomes.&nbsp;



These plants perform much of their cell division in warmer months, allowing them to use cell expansion to grow quickly in early spring, well before smaller-genome plants begin to compete for light and nutrients.



<h2 class="wp-block-heading" id="h-genome-size-diversity">Genome size diversity</h2>



The diversity in genome sizes among grasses may be one reason for their global success, as it allows them to adapt to a wide range of environmental conditions.&nbsp;



While smaller genomes typically support efficient growth, larger genomes offer unique advantages in specific environments, enabling certain species to thrive where others cannot.&nbsp;



This genetic diversity in grasses underscores the importance of variation in supporting species’ survival and adaptability across ecosystems.



<h2 class="wp-block-heading" id="h-genome-size-and-evolutionary-success">Genome size and evolutionary success</h2>



The relationship between genome size and survival is not limited to plants. Our own medium-sized genome has supported humanity’s adaptability, though we don’t face the same nutrient limitations as stationary plants.&nbsp;



Unlike grasses, humans can move to seek out food and resources, which may allow us to bear the metabolic costs associated with our DNA without significant limitation.&nbsp;



This mobility highlights how different species leverage their genetic make-up in conjunction with unique behaviors and environmental interactions to thrive across diverse habitats.



In summary, the role of genome size in evolutionary success is nuanced and complex.&nbsp;



From the efficient replication of small genomes to the adaptability enabled by larger ones, genome size continues to shape the ecological <a href="https://www.earth.com/news/asian-forests-proving-resilient-both-climate-change-human-actions/" target="_blank" rel="noreferrer noopener">resilience</a> and global distribution of life on Earth.



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How does genome size impact evolutionary success?

Every living organism relies on a genetic blueprint encoded in its DNA, yet the amount of DNA - or genome size - varies dramatically across the tree of life.&nbsp; In animals alone, genome sizes range from the minuscule genome of Intoshia variabili, a marine parasite - which is about 200 times smaller than the human genome - to the massive genome of the marbled lungfish (Protopterus aethiopicus) - which is over 40 times larger than ours.&nbsp; Plants exhibit a similar range, with the fork fern (Tmesipteris oblanceolata)...

Plants contain various bioactive compounds, or phytocompounds, that have disease-fighting properties such as antioxidant and anti-inflammatory effects. By gaining a better understanding of how phytocompounds interact with the body, experts could develop more effective treatments for a range of major <a href="http://www.earth.com/news/our-immune-system-may-protect-us-from-mental-health-issues/">immune</a> disorders.

A new study from <a href="https://www.tus.ac.jp/en/">Tokyo University of Science</a> has identified a polyphenolic compound found in blueberries called pterostilbene (PSB) that has strong immunosuppressive properties. This means that the phytocompound has the potential to treat chronic inflammatory diseases, including inflammatory bowel disease (IBD).

Pterostilbene was found to share many similarities with the powerful phytocompound resveratrol, which is known to have powerful anti-inflammatory effects. "RSV, a polyphenol, was known to have pronounced immunomodulatory and anti-inflammatory effects on animal models of colitis ulcer. Therefore, we investigated the possibility of other compounds structurally similar to RSV as a new type of treatment for IBD," explained study co-author Dr. Takuya Yashiro.

Inflammatory bowel disease is characterized by long-lasting ulcers that line the gastrointestinal tract. The ulcers are caused by chronic inflammation due to an elevated immune response in the body.

The heightened immune response involves the excessive production of molecules called cytokines, as well as two types of immune cells - dendritic cells (DCs) and T cells. 

When an immune response is triggered, the dendritic cells produce inflammatory cytokines and activate T cells to initiate a defense response. Collectively, these reactions form a complex pathway that promotes a potentially dangerous "hyper" immune response. 

The study authors set out to test various phytocompounds on the cells that are involved in a hyperactive immune response to determine which of these compounds may be capable of suppressing the immune activity. Right away, pterostilbene showed stronger immunosuppressive ability than the other candidates. 

Upon further analysis, the researchers found that PSB treatment prevents T cells from differentiating into Th1 and Th17, which elevate the immune response, while increasing their differentiation into regulatory T cells, which inhibit inflammation. The study also revealed that PSB treatment inhibits inflammatory cytokine production by dendritic cells.

Using a mouse model, the team demonstrated that orally-administered pterostilbene improved symptoms of inflammatory bowel disease.

"For disease prevention, it is important to identify the beneficial components in foods and to understand the underlying mechanism by which immune responses and homeostasis are modulated in the body," said Dr. Yashiro. "Our findings showed that PSB possesses a strong immunosuppressive property, paving the way for a new, natural treatment for IBD."

The study is published in <a href="https://faseb.onlinelibrary.wiley.com/journal/15306860">The FASEB Journal</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Compounds found blueberries could treat inflammatory disorders

Plants contain various bioactive compounds, or phytocompounds, that have disease-fighting...

Excess belly fat, also known as visceral fat, is a major risk factor for serious health complications such as <a href="http://www.earth.com/news/getting-a-flu-shot-may-protect-you-from-dangerous-heart-complications/">heart</a> disease and cancer. A new study published by <a href="https://www.bmj.com/">BMJ</a> goes a step further, suggesting that visceral fat is a strong predictor of death from any cause.

The experts found that excess belly fat is associated with a higher risk of premature death - regardless of an individual's overall weight or size. 

According to the researchers, the findings suggest that measuring central fatness could be used alongside body mass index to help determine the risk of premature death.

Individuals who are overweight or obese are known to be more susceptible to heart disease, certain cancers, kidney disease, and neurological disorders. Previous studies suggest that belly fat is more strongly linked to premature death than overall obesity, but the evidence has not been entirely conclusive. 

To investigate, an international team of researchers set out to examine whether measures of belly fat are associated with a higher risk of all cause mortality in the general population. The experts analyzed the results of 72 studies, which involved more than 2.5 million participants who were followed up with for anywhere between 3 and 24 years.

All of the studies estimated the health risks for at least three measures of midsection fatness, such as waist circumference, hip circumference, thigh circumference, and total body mass. 

A detailed analysis of the data revealed that most measures of belly fat were linked with a substantially higher risk of all cause mortality. The findings showed, for example, that each 10 centimeter increase in waist circumference was associated with an 11 percent higher risk of premature death from any cause. 

By contrast, the team identified a link between larger hips and thighs and a lower risk of all cause mortality. 

The researchers concluded that "measures of central adiposity could be used as a supplementary approach, in combination with body mass index, to determine the risk of premature death."

The study is published in the journal <a href="https://www.bmj.com/">The BMJ</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Excess belly fat is a reliable predictor of premature death

Excess belly fat, also known as visceral fat, is a...

A dangerous combination of droughts and heatwaves has substantially increased across the United States over the past 50 years, according to a new study from the <a href="https://www.aaas.org/">American Association for the Advancement of Science</a>. The regions that have been affected most by dry-hot <a href="http://www.earth.com/news/fruit-flies-reveal-why-we-sleep-more-in-cold-weather/">weather</a> extremes are located in the West and parts of the Northeast and Southeast.

The researchers also found that the areas experiencing more frequent droughts and heatwaves are becoming more and more connected. As a result, the larger impacted regions are placing enormous strain on relief efforts.

Study senior author Mojtaba Sadegh is a professor of Civil Engineering at Boise State University.

"Episodes of extreme dryness and heat are the recipe for large forest fires," said Sadegh. "These extremes are intensifying and extending at unprecedented spatial scales, allowing current wildfires to burn across the entire U.S. west coast." 

Up until now, climate risk analyses were not usually designed to focus on shifts in more than one climate parameter at the same time because coinciding severe weather events were rare. Climate change has already begun to increase the frequency of concurrent extreme events.

"Traditionally, probability of multiple extremes co-occurring was quite low, so many of the traditional risk assessment frameworks were focused on separate hazards," said Sadegh. "However, since climate change has escalated the probability of multiple extremes happening simultaneously, a paradigm shift is required to address these emerging threats."

To investigate how the frequency of concurrent droughts and heatwaves has evolved over time in the United States, the researchers analyzed simultaneous drought and heat extremes using 122 years of climate data based on ground observations. 

In the 1930s, a megadrought combined with poor farming practices led to the Dust Bowl. Concurrent droughts and heatwaves were primarily driven by a lack of precipitation at the time of the Dust Bowl, according to the study, but are now primarily driven by excess heat. 

The experts noted that the findings may be used to bolster risk assessment frameworks and inform climate adaptation and mitigation efforts.

"This study, and the 2020 fires that have burned and are burning the entire West Coast, show us that our infrastructure design frameworks may not be appropriate anymore in a warming climate," said Sadegh. 

"Our agriculture system is too vulnerable to dry-hot events, our housing codes are not proper for an era of megafires, and our wildlife is too fragmented and too stressed to tolerate a future of increasing extremes."

"We need to recognize the power of Mother Nature, and we need to respect it. We need to listen! The more we play deaf, the more Mother Nature will raise her voice."

The study is published in the journal <a href="https://advances.sciencemag.org/">Science Advances</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Droughts and heatwaves are coinciding more often

A dangerous combination of droughts and heatwaves has substantially increased across...

A new study from the <a href="https://missouri.edu/">University of Missouri Columbia</a> has found evidence that the gut microbiome has a powerful influence on <a href="http://www.earth.com/news/scientists-solve-the-mystery-of-why-we-need-sleep/">sleep</a>. When the researchers transplanted gut bacteria from mice with sleep apnea to healthy mice, the recipients exhibited increased sleepiness throughout waking hours.

Previous studies have shown that obstructive sleep apnea (OSA) may alter gut bacteria in a way that promotes comorbid conditions such as diabetes, hypertension, and cognitive problems.

"Obstructive sleep apnea is a chronic prevalent condition characterized by intermittent hypoxia and sleep fragmentation," wrote the study authors."

"Evidence suggests that OSA can alter the gut microbiome diversity and composition that may then promote the occurrence of some of the OSA-associated morbidities." 

"However, it is unclear whether perturbations in the gut microbiome caused by intermittent hypoxia (IH) can elicit sleep disturbances that underlie the increased sleep propensity that occurs in IH-exposed mice."

According to study lead author Dr. David Gozal, the research shows that the gut microbiome plays a major role in sleep regulation. This could ultimately translate into therapies that target the gut microbiome in humans to treat OSA.

"By manipulating the gut microbiome, or the byproducts of the gut microbiota, we would be in a position to prevent or at least palliate some of the consequences of sleep apnea," said Dr. Gozal. "For example, if we combine continuous positive airway pressure (CPAP) with customized probiotics that change the patient's gut microbiome, we might be able to eliminate some of the tiredness and fatigue and reduce the likelihood of the comorbidities associated with OSA that affect cognition, memory, cardiovascular disease or metabolic dysfunction. If we can do any one of those things, then this is a major movement forward in the way we treat OSA."

The researchers exposed male mice to either room air or intermittent hypoxia - a condition in which the body does not get enough oxygen. After six weeks, fecal material was collected from all of the animals. 

A third group of mice received a fecal transplant from either the mice breathing room air or those exposed to intermittent hypoxia. This group underwent sleep recordings for three consecutive days. 

The mice who received transplants from the intermittent hypoxia group showed clear signs of increased sleepiness, such as sleeping longer and more often during their normal period of wakefulness.

"This is the first study that evaluated sleep in naïve mice subjected to a fecal microbiome transplant from mice exposed to intermittent hypoxia," said Dr. Gozal. "The fecal microbiome analysis showed profile differences between the mice transplanted from intermittent hypoxia donor mice versus those exposed to room air, indicating that the transplant altered the GM of the recipient mice."

There is a growing collection of evidence to suggest that the gut microbiome influences health and sleep quality through the brain-gut microbiome axis (BGMA). Further research is needed to identify the mechanism involved in the relationship between the brain and the gut.

The study is published in the journal <a href="https://www.journals.elsevier.com/experimental-neurology">Experimental Neurology</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Gut microbiome plays an unexpected role in sleep regulation

A new study from the University of Missouri Columbia has...

Male baboons live longer when they have female friends, according to a new study from <a href="https://duke.edu/">Duke University</a>. The researchers found that strong social bonds between members of the  opposite sex were linked to higher <a href="http://www.earth.com/news/contaminated-manure-dung-beetles/">survival</a> rates.

While it is easy to assume that males are friendly with certain females for reproductive benefits, the new findings suggest that having female friends may give males a better chance at survival.  

Among humans, previous studies have shown that making and keeping friends can be as important for longevity as losing weight and getting exercise. Similar patterns have been found in a wide variety of animals, ranging from monkeys and horses to dolphins and killer whales. 

However, most of this research was focused on females, who tend to stay with the same groups as the males come and go. As a result, the dynamics of male social bonds are much less understood.

The study was focused on data from more than 540 baboons in Amboseli National Park in Kenya. Since 1971, researchers have followed individual baboons on a near-daily basis as part of the Amboseli Baboon Research Project. The experts documented who the baboons socialized with and how they fared over their lifetime. 

The Duke team used statistical techniques to calculate mortality risk at each age, and to investigate whether the link between survival and friendship was the same for males and females.

Baboon friendships are reflected in the time they spend grooming one another. This is a give-and-take interaction that involves sitting close together and stroking and picking through each other's fur to remove parasites such as ticks.

"It's a baboon's way of bonding and relieving stress, as well as providing some help with hygiene," said study senior author Susan Alberts.

Males spend very little time grooming each other, but they do groom with females, and not just when the females are fertile, explained the researchers.

The team used more than 35 years of data to estimate the strength of the bonds in each baboon's inner circle by measuring how often they spent time grooming with their closest friends. The study revealed for the first time that "baboon males live longer lives if they're socially connected."

The experts found that males who maintained strong female friendships were 28 percent more likely to survive until their next birthday. By contrast, social isolation was found to be a bigger threat to male survival than the stress and dangers of social competition.

Alberts said further research is needed to confirm that the link in baboons is in fact a causal one, and if so, to figure out exactly how the bonds of friendship affect physiology to lengthen their lifespans.

According to the researchers, their work on baboon social behavior suggests that the power of friendship may have deep evolutionary roots in the primate family tree.

"How do primate friendships get 'under the skin' to lengthen life?" said Alberts. "We still don't know; it's one of the most wonderful black boxes in my life."

The study is published in the journal <a href="https://royalsocietypublishing.org/journal/rstb">Philosophical Transactions of the Royal Society B</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 live longer when they have female friends

Male baboons live longer when they have female friends, according...

The Komodo dragon may completely vanish unless urgent action is taken to mitigate <a href="http://www.earth.com/news/dams-will-prevent-some-river-fish-from-surviving-climate-change/">climate</a> change, according to a new study from the <a href="https://www.adelaide.edu.au/">University of Adelaide</a>. These giant lizards already have restricted habitats, which are further threatened by global warming and sea level rise. 

"Climate change is likely to cause a sharp decline in the availability of habitat for Komodo dragons, severely reducing their abundance in a matter of decades," said study lead author Dr. Alice Jones. "Our models predict local extinction on three of the five island habitats where Komodo dragons are found today."

The Komodo dragon, which is the world's largest lizard species, has existed on Earth for more than a million years. Today, there are only an estimated 4,000 individuals remaining in the wild in southeast Indonesia.

"Current-day conservation strategies are not enough to avoid species decline in the face of climate change. This is because climate change will compound the negative effects of already small, isolated populations," said Dr. Jones.

"Interventions such as establishing new reserves in areas that are predicted to sustain high-quality habitats in the future, despite global warming, could work to lessen the effects of climate change on Komodo dragons."

The study is based on many years of fieldwork on the ecology and conservation status of Komodo dragons.

"Using this data and knowledge in conservation models has provided a rare opportunity to understand climate change impacts on Indonesia's exceptional but highly vulnerable biodiversity," said co-author Dr. Tim Jessop.

For their investigation, the researchers closely collaborated with the Komodo National Park and the Eastern Lesser Sunda Central Bureau for Conservation of Natural Resources.

Study co-author Deni Purwandana is the coordinator of the Komodo Survival Program. He said that the severity and extent of human impacts on Komodo dragon populations are only just being realized.

"Having an insight into future impacts of climate change provides new possibilities to work with conservation agencies and local communities to find on-ground solutions that will limit climate and other threats to Komodo dragons and their habitats," said Purwandana.

According to the researchers, climate-change-informed decisions should be a common part of conservation practice.

"Our conservation models show that Komodo dragons on two protected large islands are less vulnerable to climate change. However, even these island habitats might not provide an adequate insurance policy for the survival of the species," said Professor Damien Fordham.

"Conservation managers in coming decades may need to consider translocating animals to sites where Komodo dragons have not been found for many decades. This scenario can be tested easily using our approach."

"Our research shows that without taking immediate action to mitigate climatic change, we risk committing many range restricted species like Komodo dragons to extinction."

The study is published in the journal <a href="https://onlinelibrary.wiley.com/journal/20457758">Ecology and Evolution</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Komodo dragons are severely threatened by climate change

The Komodo dragon may completely vanish unless urgent action is...

The combination of two mosquito-borne viruses may lead to a <a href="http://www.earth.com/news/outdoor-air-pollution-increases-stroke-risk-almost-immediately/">stroke</a>, according to a new study from the <a href="https://www.liverpool.ac.uk/">University of Liverpool</a>. The team has been investigating the link between Zika and chikungunya infection and neurological disease. 

These two mosquito-borne viruses, which are most prevalent in the tropics, are responsible for large outbreaks of rash and fever in places like Brazil and India. 

Zika is known to cause brain damage in babies if expectant mothers are infected. According to the new findings, Zika also causes nervous system disease in adults.

The investigation was focused on 201 adults with new onset neurological disease, treated in Brazil during the 2015 Zika and 2016 chikungunya epidemics. The study is the largest of its kind to describe the neurological features of infection for several mosquito-borne viruses circulating at the same time.

The researchers found that each virus can cause a range of neurological problems. Zika was found to be more likely to cause Guillain-Barre syndrome, which is characterized by nerve damage in the arms and legs. Chikungunya is more likely to cause inflammation and swelling in the brain and spinal cord. 

While stroke can be caused by either virus on its own, the analysis showed that patients infected with both were more susceptible to stroke. 

"Our study highlights the potential effects of viral infection on the brain, with complications like stroke. This is relevant to Zika and chikungunya, but also to our understanding of other viruses, such as COVID-19, which is increasingly being linked to neurological complications," said study co-author Dr. Suzannah Lant.

Patients were recruited over a two-year period at Hospital da Restauração in Recife in Brazil, and the experts conducted omprehensive PCR and antibody testing for viruses.

Of the 201 patients admitted with suspected neurological disease linked to Zika, chikungunya or both, 148 had confirmation of infection through lab testing. Approximately one-third of these individuals were found to be infected by more than one virus.

Among the stroke patients, about two-thirds had infection with more than one virus. There was evidence to suggest that stroke following Zika and chikungunya viral infection most often occurs in patients who already have risk factors, such as high blood pressure.

Study senior author Professor Tom Solomon is the director of the National Institute for Health Protection Research Unit in Emerging and Zoonotic Infections at the University of Liverpool.

"Although the world's attention is currently focused on COVID-19, other viruses that recently emerged, such as Zika and chikungunya, are continuing to circulate and cause problems," said Professor Solomon. "We need to understand more about why some viruses trigger stroke, so that we can try and prevent this from happening in the future."

The study is published in the journal <a href="https://www.thelancet.com/journals/laneur/issue/current">Lancet Neurology</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Mosquito-borne viruses can trigger a stroke

The combination of two mosquito-borne viruses may lead to a...

Scientists solve the mystery of why we need sleep. In the first couple years of life, sleep helps build the brain's infrastructure. After the age of two and a half, sleep takes on an entirely new decluttering role, according to a new study from <a href="https://www.ucla.edu/">UCLA</a>.

While it is known that sleep deprivation can lead to severe <a href="http://www.earth.com/news/our-immune-system-may-protect-us-from-mental-health-issues/">health</a> problems, much about the purpose and function of rest has remained a mystery. The UCLA team has discovered for the very first time that the purpose of sleep takes a dramatic shift early in life.

Before the age of 2.5 years, the brain grows very rapidly. As vivid dreams occur during the REM phase, the young brain is building and strengthening synapses, which are the structures that connect brain cells together so they can communicate.

"Don't wake babies up during REM sleep - important work is being done in their brains as they sleep," said senior study author Professor Gina Poe, who has conducted sleep research for more than 30 years.

The researchers report that after the age of 2.5, the primary purpose of rest switches from building the brain to maintaining and repairing it, and this becomes its permanent role.

A certain amount of neurological damage naturally accumulates during waking hours, including damage to genes and proteins within neurons. Over time, this debris can build up and cause brain disease. Sleep helps repair this damage, essentially decluttering the brain and eliminating the debris that can lead to serious illness.

According to study senior author Professor Van Savage, nearly all of this brain repair occurs during sleep. "I was shocked how huge a change this is over a short period of time, and that this switch occurs when we're so young. It's a transition that is analogous to when water freezes to ice."

For the investigation, the researchers conducted the most comprehensive statistical analysis of sleep to date. The analysis was focused on data from more than 60 studies involving humans and other mammals. 

The evidence was very consistent that all species experience a dramatic decline in REM sleep when they reach the human developmental equivalent of about 2.5 years of age. The fraction of time spent in the REM phase after this point was found to be roughly the same across all humans and animals studied.

While newborns spend about 50 percent of their rest time in the REM phase, this drops to 25 percent by age 10 and continues to decline with age. The significant dropoff in REM sleep at about 2-and-a-half happens just as the major change in the function of sleep occurs, said Professor Poe.

"Sleep is as important as food. And it's miraculous how well sleep matches the needs of our nervous system. From jellyfish to birds to whales, everyone sleeps. While we sleep, our brains are not resting."

Chronic sleep deprivation likely contributes to long-term health problems such as dementia and other cognitive disorders, diabetes, and obesity, to name a few, said Professor Poe. When you start to feel tired, she said, don't fight it - go to bed.

"I fought sleep and pulled all-nighters when I was in college, and now think that was a mistake," said Professor Savage. "I would have been better off with a good night's sleep. Now when I feel tired, I don't have any guilt about sleeping."

According to Professor Poe, a regular seven-and-a-half hours of rest a night is normal, and time lying awake doesn't count. "A good night's sleep is excellent medicine. And it's free."

The study is published in the journal <a href="https://advances.sciencemag.org/">Science Advances</a>. 

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Scientists solve the mystery of why we need sleep

Scientists solve the mystery of why we need sleep. In...

The immune system may not only be guarding our physical health, but our <a href="http://www.earth.com/news/resilience-training-can-help-address-mental-health-crisis/">mental health</a> as well. Experts led by <a href="https://www.yale.edu/">Yale University</a> came to this conclusion while they compared immune system cells in the spinal fluid of MS patients and healthy subjects.

In the spinal fluid of healthy patients, the team discovered an inflammatory autoimmune response that is typically associated with neurodegenerative diseases such as multiple sclerosis (MS).

The findings support an emerging theory that gamma interferons, a type of immune cell that helps induce and modulate a variety of immune system responses, may also help to prevent depression in healthy people.

"We were surprised that normal spinal fluid would be so interesting," said study senior author Professor David Hafler.

Previous studies have shown that blocking gamma interferons, along with the T cells they help produce,  can cause depressive symptoms in mice. Professor Hafler noted that depression is also a common side effect in patients with MS treated with a different type of interferon.

The investigation was made possible through a powerful new technique which allows individual cells to be examined in great detail. Using this technology, the researchers determined that while the characteristics of T cells in the spinal fluid of healthy people share similarities with those of MS patients, they lack the ability to replicate and cause the damaging inflammatory immune system response seen in autoimmune diseases such as MS.

In the brain of all people, the immune system is prepared to make an inflammatory response and may have another function than defending against pathogens, said Professor Hafler. "These T cells serve another purpose and we speculate that they may help preserve our mental health."

According to Professor Hafler, his lab and colleagues at Yale plan to explore how immune system responses in the central nervous system may affect psychiatric disorders such as depression.

The study is published in the journal <a href="https://immunology.sciencemag.org/">Science Immunology</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

Our immune system may protect us from mental health issues

The immune system may not only be guarding our physical...

Hundreds of thousands of <a href="http://www.earth.com/news/river-damming-threatening-fish/">migratory</a> birds have been found dead over the last few weeks across New Mexico, Arizona, Texas, and Colorado, and the cause remains a mystery. The first signs of the mass die-off emerged on August 20, when about 200 dead birds were found at the White Sands Missile Range in southern New Mexico.

Soon after the discovery at White Sands, dead birds began turning up in alarming numbers in other regions of New Mexico like Jemez Pueblo, Roswell, and Socorro.

A team of wildlife biologists, including Professor Martha Desmond of <a href="https://www.nmsu.edu/">New Mexico State University</a>, now faces the somber task of examining hundreds of birds that have perished in an effort to identify the cause of death. 

"It's just terrible," Professor Desmond told <a href="https://www.cnn.com/">CNN</a>. "The number is in the six figures. Just by looking at the scope of what we're seeing, we know this is a very large event, hundreds of thousands and maybe even millions of dead birds, and we're looking at the higher end of that."

Professor Desmond speculates that the deaths are tied to the ongoing wildfires that have devastated millions of acres across several western states. She explained that the fires may have pushed some birds into early migrations that they were not physically prepared for, while others likely died from lung damage tied to smoke inhalation.  

"Birds who migrated before they were ready because of the weather might have not had enough fat to survive," Professor Desmond told CNN. "Some birds might have not even had the reserves to start migrating so they died in place."

Many different types of migratory birds have been found deceased, including bluebirds, sparrows, blackbirds, flycatchers, and warblers. There were many reports from people who have witnessed strange behavior among birds in the last few weeks. For example, individuals that are typically seen foraging in shrubs or trees were observed chasing insects on the ground.

In her interview with CNN, Professor Desmond said that many birds were lethargic and unresponsive, and were getting struck by cars in larger numbers than ever before. She added that at the missile range golf course, swallows were sitting on the ground letting people approach them.

Tristanna Bickford, a representative of the New Mexico Department of Game and Fish, told the New York Times that state officials have provided specimens to the National Wildlife Health Center in Wisconsin for examination. She said it could take months for biologists to conclusively determine what has caused the die-off.

According to the US Forest Service in Santa Fe, citizen scientists can help collect dead birds by following these guidelines: wear gloves; document the date, location, and number of birds collected at each site; store the birds in plastic bags; and deliver the specimens directly to wildlife authorities or double bag and store them in the freezer.

Professor Desmond pointed to the role of climate change in this shocking event. "We have lost three billion birds in the U.S. since 1970 and we've also seen a tremendous decline in insects," she told CNN, "so an event like this is terrifying to these populations and it's devastating to see."

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

The number of dead migratory birds in the western U.S. may climb into the millions

Hundreds of thousands of migratory birds have been found dead...

An <a href="http://www.earth.com/news/invasive-plant-seeds-are-traveling-to-the-u-s-in-shipping-containers/">invasive</a> beetle that has been destroying Guam's coconut trees for more than a decade has made an unexpected "host shift" to the endangered cycad tree, Cycas micronesica. The coconut rhinoceros beetle (CRB), which first appeared on the island in 2007, could potentially wipe out the last remaining native cycad trees in Guam.

Researchers at the <a href="https://www.uog.edu/">University of Guam</a> explained that prior to the beetle's arrival, coconut trees were the second most abundant tree on the island, which helped the beetles to become established and thrive. Efforts to control the invasion have not been effective, and the beetles have exploded in numbers.

"Our initial alarm after documenting the CRB burrowing activity on cycad trees was the fact that Guam's cycad species was actually the most abundant tree on the island only 20 years ago," said study co-author Irene Terry. "Where else have the most abundant and second most abundant forest species been threatened by the recent invasion of one non-native herbivore?"

Based on direct measurements, the researchers discovered that the plant tissues of the heavily damaged coconut trees have declined in starch content. The experts theorize that this is what motivated the host shift, considering that large amounts of starch are available in the cycad stems.

"The CRB behaviors that we documented fit the 'ecological fitting theory,' which states that shifting to a new host species is due to compatible resources or signals in the new host," said Terry.

Before the beetle shifted its attention, the cycad population in Guam had already been hit hard from damage by other invasive insects and mammals. In the last 15 years, 96 percent of the trees have been lost.

"When the CRB damage in our managed gardens began showing up on several cycad species, we knew that it was only a matter of time before the CRB host shifts included Guam's native cycad," said Benjamin Deloso, who curates the University of Guam's interpretive cycad garden.

The beetle had been observed burrowing into a diverse range of cycad species that are raised in the garden originating from Asia, Australia, Central America, and the Caribbean regions. "The damaged species included two families and four genera, so the dietary needs of the coconut rhinoceros beetle appear to be met at the cycad Order level," said Deloso.

With the list of herbivorous cycad predators growing, there is a need for continued monitoring of the cycad population so that experts can understand which of the threats require the most urgent mitigation. 

According to the researchers, the ongoing absence of international experts from funded conservation projects will increase the probability that Guam's native cycad trees will vanish.

The study is published in the journal <a href="https://www.tandfonline.com/loi/kcib20">Communicative &amp; Integrative Biology</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Invasive beetle turns its attention to Guam's endangered cycad trees

An invasive beetle that has been destroying Guam's coconut trees...

The Arctic climate is shifting away from its frozen state much faster than what can be projected, according to the <a href="https://ncar.ucar.edu/">National Center for Atmospheric Research</a> (NCAR). The experts report that <a href="http://www.earth.com/news/global-warming-is-changing-insect-communities-in-the-arctic/">warming</a> is progressing so rapidly that future climate changes are no longer predictable based on past fluctuations.

Arctic weather patterns have always experienced seasonal variability from year to year, with levels of precipitation and sea ice that are dependent on colder or warmer winters. However, the comprehensive new NCAR study reveals that Arctic temperatures have increased to the point that year-to-year variability no longer reflects historical patterns.

"The rate of change is remarkable," said study lead author Laura Landrum. "It's a period of such rapid change that observations of past weather patterns no longer show what you can expect next year. The Arctic is already entering a completely different climate than just a few decades ago."

In collaboration with study co-author Marika Holland, Landrum found that the extent of Arctic sea ice retreat in recent decades is so drastic that even an unusually cold year will no longer be able to produce the amount of summer sea ice that existed as recently as the mid-20th century. 

The experts determined that air temperatures in the fall and winter will warm up enough for the Arctic to enter a statistically distinct climate by the middle of this century. The transition will be characterized by major changes in precipitation, where rainfall will replace snowfall for months out of the year.

For the investigation, the researchers used five of the world's leading climate models, hundreds of detailed computer simulations, and direct observations of Arctic climate conditions. By analyzing this massive dataset, the researchers were able to clearly define the climate boundaries of the "old Arctic," or the amount of natural variability each year. They were also able to pinpoint when human-caused warming will push the Arctic beyond these natural boundaries and into an entirely new climate. 

According to the study, the changes in the Arctic climate are so pronounced that the average extent of sea ice in September has dropped by 31 percent since the first decade of the satellite era.

Each of the five models used in the study showed that a new climate for sea ice already emerged in the late 20th and early 21st centuries. Over the next several decades, the Arctic will likely begin to experience frequent ice-free conditions. 

Based on a high emissions scenario, several of the climate models indicated that the Arctic will become mostly ice free for 3 to 10 months out of the year by the end of this century.

"The Arctic is likely to experience extremes in sea ice, temperature, and precipitation that are far outside anything that we've experienced before," said Landrum. "We need to change our definition of what Arctic climate is."

If greenhouse gas emissions and global warming continue at the current rate, the seasonal cycle of precipitation will soon change dramatically. Most continents will experience an increase in the rainy season by 20 to 60 days within the next three decades, according to the study authors.

The research is published in the journal <a href="https://www.nature.com/nclimate">Nature Climate Change </a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

The Arctic is transitioning into an entirely different climate

The Arctic climate is shifting away from its frozen state...

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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

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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"

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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

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