For centuries, humans have shaped the traits of domesticated animals to meet their needs. From larger cows producing more milk to dogs bred for specific temperaments, selective breeding has transformed species in remarkable ways. Recent research on German pigs has revealed just how quickly these changes can occur.



A team from Martin Luther University Halle-Wittenberg (<a href="https://www.uni-halle.de/?lang=en" target="_blank" rel="noreferrer noopener">MLU</a>) has found that German domestic pigs have experienced dramatic skull modifications within a century. 



Their snouts have shortened, and their foreheads have flattened, traits that were not intentionally selected. The findings provide fresh insight into the unintended <a href="https://www.earth.com/news/old-and-wise-animals-are-essential-for-the-survival-of-species/" target="_blank" rel="noreferrer noopener">consequences</a> of breeding practices.



<h2 class="wp-block-heading" id="h-a-century-of-change-in-pig-breeding">A century of change in pig breeding</h2>



Pigs have been an essential part of human agriculture for thousands of years. Over time, their appearance has shifted significantly, influenced by both natural and human-driven factors. 



In Germany, the early 20th century marked a turning point in pig breeding, as demand for pork increased dramatically. Farmers prioritized traits such as rapid growth, high fertility, and efficient meat production.



"The demand for pork in Germany increased significantly at the beginning of the 20th century, and breeders were encouraged to optimize their animals. They needed them to grow quickly, provide good meat, and be fertile," explained Dr. Renate Schafberg, Head of the Domestic Animal Collection at MLU.



To understand the impact of these breeding efforts, Dr. Schafberg worked with Dr. Ashleigh Haruda from Oxford University to analyze 135 pig skulls from different time periods.



The study included two domestic breeds - Deutsches Edelschwein and Deutsches Landschwein - as well as wild boars, which served as a control group. The results revealed a striking transformation in domestic pigs, while wild boars showed no comparable changes.



<h2 class="wp-block-heading" id="h-surprising-skull-modifications">Surprising skull modifications</h2>



One of the most significant findings of the study was the extent of skull changes in domesticated pigs. Their snouts became notably shorter, and their foreheads lost their outward curve. These modifications occurred in both domestic breeds, despite the fact that they were raised separately.



"We didn’t expect such pronounced differences to appear within a span of only 100 years," said Dr. Schafberg. The fact that both breeds experienced similar changes suggests that the modifications were not the result of direct selection for skull shape.



"These changes occurred even though breeders did not select the animals specifically for their skull shape, as this trait was not important for breeding. Instead, the changes appear to be an unintended by-product of selecting the desired traits," noted Dr. Schafberg.



This discovery highlights how the pursuit of specific breeding goals can lead to unforeseen alterations in an <a href="https://www.earth.com/news/what-animal-will-replace-humans-as-earths-dominant-species-this-scientist-has-an-idea/" target="_blank" rel="noreferrer noopener">animal</a>’s physical structure.



<h2 class="wp-block-heading" id="h-could-diet-play-a-role">Could diet play a role?</h2>



While breeding practices played a major role in shaping the skulls of domestic pigs, another factor may have contributed: diet. 



Nutrition is a key influence on the <a href="https://www.earth.com/news/sheep-have-been-intertwined-with-humans-for-over-11000-years/" target="_blank" rel="noreferrer noopener">growth and development</a> of animals. Modern pigs are primarily fed high-protein pellets designed to support rapid growth and efficient meat production.



By contrast, wild boars continue to consume a varied diet, including roots, nuts, and small animals. Their skulls have remained unchanged over the past century, suggesting that their natural feeding habits have helped maintain their original features. 



The study raises intriguing questions about the relationship between diet and physical evolution in domesticated animals.



<h2 class="wp-block-heading" id="h-power-of-human-influence">Power of human influence</h2>



The findings demonstrate the remarkable speed at which human intervention can shape animal species. While many assume that significant evolutionary changes take millions of years, selective breeding can accelerate these processes dramatically.



"Charles Darwin assumed that long periods of time - millions of years - are required for major changes to take place. Our work is further proof that humans can greatly accelerate this process through selective breeding," said co-author Dr. Frank Steinheimer, Head of the Central Repository of Natural Science Collections at MLU.



These insights have broader implications for agriculture and animal husbandry. As selective breeding continues to shape domesticated animals, researchers must consider the potential consequences, both intended and unintended. 



The study serves as a reminder that even small changes in breeding practices can have <a href="https://www.earth.com/news/birds-are-moving-north-and-breeding-earlier-in-a-changing-climate/" target="_blank" rel="noreferrer noopener">lasting effects</a> on animal physiology.



<h2 class="wp-block-heading" id="h-pig-breeding-may-continue-in-the-future">Pig breeding may continue in the future</h2>



As the global demand for meat continues to grow, breeding practices will likely continue to evolve. Understanding how these methods impact animal development is crucial for ensuring sustainable and ethical farming. 



Scientists will need to explore the long-term effects of breeding choices, considering not only productivity but also the health and well-being of animals.



The study was funded by the German Federal Ministry of Education and Research (<a href="https://www.bmbf.de/EN/Home/home_node.html" target="_blank" rel="noreferrer noopener">BMBF</a>) and the European Research Council (<a href="https://erc.europa.eu/homepage" target="_blank" rel="noreferrer noopener">ERC</a>). 



The research offers a compelling look at the complex relationship between human influence and animal evolution, shedding light on the ways in which farming practices shape the very biology of domesticated <a href="https://www.earth.com/news/world-wildlife-conservation-day-2024-saving-species-from-extinction/" target="_blank" rel="noreferrer noopener">species</a>.



The study is published in the journal <a href="https://royalsocietypublishing.org/doi/10.1098/rsos.241039" target="_blank" rel="noreferrer noopener">Royal Society Open Science</a>.



-----



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Selective breeding has dramatically sped up the evolution of pigs

For centuries, humans have shaped the traits of domesticated animals to meet their needs. From larger cows producing more milk to dogs bred for specific temperaments, selective breeding has transformed species in remarkable ways. Recent research on German pigs has revealed just how quickly these changes can occur. A team from Martin Luther University Halle-Wittenberg (MLU) has found that German domestic pigs have experienced dramatic skull modifications within a century. Their snouts have shortened, and their foreheads have flattened, traits that were not intentionally selected. The findings...

Ceratopsian dinosaurs like the triceratops can be distinguished by their overstated horns and frills, and there have been many theories as to why these trademarks evolved. A new study led by Andrew Knapp of <a href="https://www.qmul.ac.uk/">Queen Mary University of London</a> has revealed that the exaggerated features most likely advanced for sexual signaling.

Ceratopsian dinosaurs were widespread across what is now North America, Europe, and Asia during the <a href="https://www.earth.com/news/pterosaurs-mass-extinction-event/">Cretaceous Period</a>. There were over 70 species of ceratopsians, all of which had large skulls and distinctive morphological features that the researchers refer to as “ornaments.”

“A number of hypotheses have been suggested for the presence and evolution of such ornaments, including predator defense, mechanical support, thermoregulation, social or sexual signaling, and species recognition,” wrote the study authors.

“The first three of these proposed explanations have been considered and ruled out in many analyses of specific systems, leaving species recognition and sexual selection as the two main competing hypotheses that could offer a more general explanation for the evolution of ornaments.”

To test the theory of species recognition, the experts looked at the differences in traits among sympatric species, which share the same location, and non-sympatric species, which do not overlap geographically.

“If species recognition is a driver of trait evolution, then morphological disparity in ornamentation should be significantly higher between sympatric species because species that are not sympatric have minimal selective pressure to evolve obvious visual differences,” explained the researchers.

The team compared traits across ceratopsians based on 350 defined characteristics. While the ornaments were likely used to distinguish between species, the researchers found no evidence that species recognition was the driving force behind their emergence.

“We find no support for the hypothesis that sympatry correlates with higher ornament divergence in ceratopsian dinosaurs, nor for the wider species recognition explanation for the evolution of horns, frills and other display traits in the Ceratopsia,” wrote the study authors.

The researchers concluded that the horns and frills of ceratopsians were likely developed to help them attract suitable mates. 

The experts explained that sexually selected ornaments are expected to show rapid evolution and characteristic patterns of growth, which have both been demonstrated in ceratopsians. Further research is needed, however, to confirm that the horns and frills were adapted for mating purposes.

This study is published in <a href="http://rspb.royalsocietypublishing.org/">Proceedings 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

Triceratops used its horns to attract mates

Ceratopsian dinosaurs like the triceratops can be distinguished by their...

A new study led by the <a href="https://le.ac.uk/">University of Leicester</a> is reporting that fossils may not always provide an accurate representation of what an animal was like when it was still alive. Animals decompose and often lose parts of their bodies as they deteriorate, and so the images projected by fossils can be distorted.


A research team comprised of paleontologists examined animal carcasses as they gradually decomposed to get a better understanding of the process. They found that, over time, the <a href="https://www.earth.com/news/preparing-fossils/">fossils</a> are reduced to incomplete specimens.

Scientists reconstruct fossils in order to answer fundamental questions about extinct animals. A more accurate conclusion can be drawn about ancient animals and their surroundings if paleontologists become aware of how much of a fossil is missing or what may have been altered during the decomposition process.

“As soon as an organism dies, it starts to decay, and this process of decomposition inevitably involves changes in how features or body parts look: they may collapse, alter their shape or position; all too soon they liquefy and are eaten by bacteria until nothing remains,” said Professor Sarah Gabbott.

“The more a body deteriorates over time, the more body-parts are missing - rather like modern representations of zombies in Game of Thrones and The Walking Dead,” said study lead author Mark Purnell.

Purnell explained that the key to working with incomplete fossils is having the ability to recognize partially-decomposed features and missing body parts.

The researchers used “laboratory decay experiments” to document every body part that decayed from a wide range of decomposing animals. These experiments gave the researchers new insight into the process of decomposition and fossilization.

The study authors emphasized the importance of determining how a fossil formed before it is reconstructed or analyzed.

Co-author Dr.Maria McNamara explained: “If we understand this we are better able to avoid producing incomplete restorations of animals with crucial parts missing or decayed, and to recognize and be aware of the gaps in our knowledge.”

The research is published in the journal <a href="http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1475-4983">Palaeontology</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Herschel Hoffmeyer

Incomplete fossils can provide a distorted view of ancient life

A new study led by the University of Leicester is...

Predators may be able to learn where prey can be found by observing others outside their species, according to a new study. 

Researchers from the <a href="https://stri.si.edu/">Smithsonian Tropical Research Institute</a> (STRI) in Panama conducted the research with bats to see if individuals from different species learned from one another. 

“We wanted to know if bats learn to recognize new foods from members of another bat species as quickly as they learn from their own species,” said Krista Patriquin, the study’s first author. “It turns out they do.”

The innovative study gives a possible explanation for why bats are so resilient and widespread. Their ability to find prey based on other bat species could help them adapt when traditional sources of prey are scarce. 

“This tells us how bats may cope with changes in food availability resulting from environmental changes and helps to explain how bats have become such successful and widespread mammals,” said Patriquin.

For the study, the researchers taught several fringe-lipped bats, Trachops cirrhosus, to associate a computer generated tone with a food reward of bait fish. 

“We previously taught the fringed-lipped bats to identify a frog call with the same food reward,” said Rachel Page. “It took them longer to recognize this artificially generated sound as a signal for food, presumably because it was not a sound that was familiar to them.”

Once the <a href="https://www.earth.com/news/bats-carry-dangerous-viruses/">bats</a> knew that the tone meant prey, the researchers tested to see if other bats unfamiliar with the tone could learn from those in their same species. 

The researchers then wanted to see if fringe-lipped bats could learn to identify a tone with prey from another species, the white-throated, round-eared bat, Lophostoma silvicolum.

The results showed that the bats could quickly pick up on the cues from other bats of different species.

The study shows how in critical situations where food is scarce, bats could use social learning skills and take cues outside their species to adapt and find new sources of prey. 

“These are highly intelligent bats!” said Jenna Kohles, an STRI intern when the study was done. “We've gained exciting insights into how not just one species may adapt to environmental changes and new food resources, but how whole communities of animals occupying similar ecological niches may adapt together as information and innovation spreads from one species to another.”

--

By<a href="mailto:kayvandette@gmail.com"> Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Some predators find food by learning from other species

Predators may be able to learn where prey can be...

A new ocean-life zone has been identified between 400 and 1,000 feet deep in the Caribbean Sea. Fish that appeared to belong in shallow reefs were observed on a deep reef system in Curaçao just below the mesophotic reef zone.

The new zone, called the rariphotic, may have become a refuge for <a href="https://www.earth.com/news/fish-saving-coral-reefs/">reef fish</a> to escape warming ocean waters and deteriorating coral habitats. Many scientists have speculated that these deep reef areas, often referred to as the “coral reef twilight zone,” may serve as refuges for shallow-water fish.

The findings of the study reveal how little is actually known about the biodiversity of reef fishes.

Lead author Carole Baldwin is the Curator of Fishes at the <a href="https://naturalhistory.si.edu/">National Museum of Natural History</a> and the director of the Smithsonian's Deep Reef Observation Project (DROP).

“It's estimated that 95 percent of the livable space on our planet is in the ocean,” said lead author Carole Baldwin.

“Yet only a fraction of that space has been explored. That's understandable for areas that are thousands of miles offshore and miles deep. But tropical deep reefs are just below popular, highly studied shallow reefs--essentially our own backyards. And tropical deep reefs are not barren landscapes on the deep ocean floor: they are highly diverse ecosystems that warrant further study. We hope that by naming the deep-reef rariphotic zone, we'll draw attention to the need to continue to explore deep reefs.”

More than 40 researchers, including experts from the <a href="https://stri.si.edu/">Smithsonian Tropical Research Institute</a> (STRI), have extensively studied deep-reef fishes and invertebrates off Curaçao since DROP began in 2011.

Approximately 80 submersible dives provided depth observations of around 4,500 fishes representing 71 species. Most of the species found in the rariphotic zone turned out to be related to shallow reef fish rather than to deepwater fish.

The scientists named six new genera and about 30 new species as they examined the 0.08 square mile area of reef.

“About one in every five fish we're finding in the rariphotic of the Caribbean is a new species,” said study co-author D. Ross Robertson. “So far, my favorite is Haptoclinus dropi.”

The researchers found that shallow-water reef fish are equipped to live at least two times deeper in the ocean than previously realized.

“Reef ecosystems just below the mesophotic are globally underexplored, and the conventional view based on the few studies that mention them was that mesophotic ecosystems transition directly into those of the deep sea,” said Baldwin. “Our study reveals a previously unrecognized zone comprising reef vs. deep-sea fishes that links mesophotic and deep-sea ecosystems.”

The research is published in the journal <a href="http://www.nature.com/srep/">Scientific Reports</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Carole Baldwin, Smithsonian

New ocean-life zone discovered and named in the Caribbean

A new ocean-life zone has been identified between 400 and...

One benefit to long-term studies is that they can yield crucial results and show previously unobserved behavior in different species such as nesting birds. Even a study of nesting success that is conducted over a period of 3 to 5 years might miss patterns or the significant impact of climate variations. 

Researchers from the <a href="https://www.ubc.ca/">University of British Columbia</a> have conducted a study using data collected from 39 years of monitoring a population of Song Sparrows on Mandarte Island. The surprising results shed insight on how nesting behaviors can vary and change over a long span of time. 

The study was published in the journal The Auk: Ornithological Advances. 

The researchers chose the Song Sparrow data because the population on Mandarte Island has been monitored since 1975. The Mandarte population represents a unique research opportunity because the birds stay on the island year-round. 

“Researchers have been learning about the Song Sparrow population on Mandarte Island since 1960, and monitoring the population continuously since 1975,” said Peter Arcese, a co-author of the new study. “Because the population is semi-isolated, small, and resident year-round, we band all birds in the nest and have genotyped all nestlings since 1991.”

After analyzing the data, the results showed that of over 3,000 nesting attempts among the sparrows, 64 percent were successful. The researchers also noticed several patterns that emerged over the nearly four decades of data. 

For example, it was discovered that through the years, older female birds were less successful and this was consistent with all aging female <a href="https://www.earth.com/news/sparrows-decide-build-nests/">Song Sparrows</a> in the population. 

Other factors and their impact on the population were less consistent and more complex such as inclement weather and population numbers.

The results call into question shorter studies and how well they can determine the impacts of different external factors on a species. 

“Most studies of plant and animal populations in nature last three to five years, but ecological processes are often dramatically affected by climate and community change, which plays out over decades,” said Arcese. “Long-term studies like ours provide an invaluable record of change in population processes, which can help interpret the results of short-term studies of species not as easily studied as Song Sparrows.” 

--

By<a href="mailto:kayvandette@gmail.com"> Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com </a>Staff Writer

Image Credit: D. Janus

Long term sparrow study reveals nesting struggles

One benefit to long-term studies is that they can yield...

Researchers at the <a href="https://stri.si.edu/">Smithsonian Tropical Research Institute</a> in Panama have discovered the earliest evidence that the Mayans raised and traded dogs and other animals, most likely for food and ceremonial use.

Archaeologist Ashley Sharpe and colleagues found that the ancient animal trade began in Maya around 2,500 years ago during the Preclassic Period, and became more widespread during the Classic Period. 

The experts believe that raising animals for food and organized ceremonies played a major role in the development of the <a href="https://www.earth.com/news/mayan-civilization-collapsed-twice/">Mayan civilization</a>.

“In Asia, Africa and Europe, animal management went hand-in-hand with the development of cities,” said Sharpe. “But in the Americas people may have raised animals for ceremonial purposes. The growth of cities doesn't seem to be directly tied to animal husbandry.”

The team analyzed the isotopes of animal remains from a Mayan dig site in Ceibal, Guatemala. Most of the bones and teeth they examined dated back to between 700 and 350 B.C., during the Maya Middle Preclassic period.

“The animal remains fall into two categories, those with lower carbon isotopes, indicating they were eating mostly wild plants, and those with higher isotopes, which were probably eating corn,” explained Sharpe.


Two northern turkeys, one large cat, and all of the dogs observed in the study had higher isotopes, indicating that they ate corn or other animals that fed on corn. Deer bones that showed butcher marks had lower carbon isotopes, which means that they were likely hunted and not domesticated.

The remains of both a large and a small cat analyzed by the team had lower carbon isotopes, suggesting that they lived in the wild as well.

Forty-four of the 46 animals had strontium isotope ratios that matched the southern lowlands region, but jaw bones from two dogs matched mountainous areas.

“This is the first evidence from the Americas of dogs being moved around the landscape,” said Sharpe. “Around 1000 A.D. there's evidence that dogs were moved out to islands in the Caribbean, but the Ceibal remains are dated at about 400 B.C.”

The bones and teeth of a large cat were found with the jaw bone of one of the dogs.

“The interesting thing is that this big cat was local, but possibly not wild,” said Sharpe. “Based on its tooth enamel, it had been eating a diet similar to that of the dogs since it was very young. Perhaps it was captured and raised in captivity, or it lived near villages and ate animals that were feeding on corn. We still have to look at the DNA to figure out if it was a jaguar or a puma.”


Sharpe is looking forward to analyzing human remains to see if they were all originally from this region.

“It's interesting to consider whether humans may have had a greater impact managing and manipulating animal species in ancient Mesoamerica than has been believed,” said Sharpe. “Studies like this one are beginning to show that animals played a key role in ceremonies and demonstrations of power, which perhaps drove animal-rearing and trade.”

The study is published in the <a href="http://www.pnas.org/">Proceedings of the National Academy of Sciences</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Ashley Sharpe

Ancient Mayans raised dogs for food and sacrifice

Researchers at the Smithsonian Tropical Research Institute in Panama have...

Renowned physicist Richard Feynman once said that biology can be explained by understanding the “wiggling and jiggling” of atoms. For the first time, a research team led by the <a href="http://www.bristol.ac.uk/">University of Bristol</a> is describing how this movement of atoms is strategically choreographed within enzymes to enable organisms to live at different temperatures.

<a href="https://www.earth.com/news/bacteria-cold-green-detergents/">Enzymes</a> are the proteins that act as catalysts to make biological reactions happen. This is the first study to link the subtle dance of an enzyme to its ideal temperature.

The findings of the study also suggest that proteins successfully evolved as catalysts because of their ability to control their own movement in response to chemical reactions.

Dr. Marc van der Kamp and colleagues observed that the heat capacity of enzymes changes during catalytic activity. They found that the extent of this change is the critical factor in determining the temperature at which the enzyme works best.

“Our computer simulations of the 'wiggling and jiggling' of enzymes at different stages in the reaction tells us how these structural fluctuations give rise to the difference in heat capacity, and thereby can predict the optimum temperature of an enzyme,” said Dr. Van der Kamp. “Our work demonstrated that we can do this accurately for two completely different enzymes, by comparing to experimental data.”

“What is fascinating to see is that the whole enzyme structure is important: the 'dance' does not only change close to where the chemical reaction takes place, but also in parts much further away. This has consequences for evolution: the combination of the enzyme structure and the reaction the enzyme catalyses will define its optimal working temperature. A subtle change in structure can change the 'dance'.”


The research may provide new insights for the development of improved biocatalysts used in industrial processes, such as the production of drugs.

The study is published in <a href="https://www.nature.com/ncomms/">Nature Communications</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Dr Marc van der Kamp and Michael Connolly

How organisms adapt to live at different temperatures

Renowned physicist Richard Feynman once said that biology can be...

Would you rather live longer and be unhealthy, or have a shorter life, but better health? Luckily that’s a conundrum we as humans don’t necessarily have the ability to determine. But if you’re a blackbird living in <a href="https://www.earth.com/news/risk-wildfires-europe-increase/">European</a> cities – and you have the ability to read a new study published in <a href="http://rsbl.royalsocietypublishing.org/">Biology Letters</a> – that may be a choice you can make, whether you know it or not.

Research led by <a href="https://www.rug.nl/?lang=en">University of Groningen</a> biologists has determined that blackbirds living in five European cities live longer than those living in the forests in proximity to those cities. However, this comes at a cost. Their research also found that the city birds have a significantly poorer health status than the rural birds. 

The researchers travelled to Granada, Seville, Madrid, Dijon, and Turku to obtain blood samples from the blackbirds living in these cities, as well as adjacent rural areas. They then compared the length of telomeres – the repetitive sequences of DNA that are the protective end caps of chromosomes – between city birds and rural birds. The length of telomeres is an unambiguous marker of health, as they protect DNA from deterioration over time. Through the natural processes of aging, telomeres become shorter, but stress can accelerate this shortening.

Age of each bird was also assessed, as scientists are able to distinguish older birds from yearlings through observing the moulting pattern. This allowed them to estimate the proportion of older birds in the populations. Their measurements found that the telomeres of city yearlings were substantially shorter than those of rural yearlings, and this difference was even more pronounced in older birds.

This means that city birds were showing signs of premature aging, signifying that they weren’t as healthy as rural blackbirds. However, the proportion of older birds was higher in the cities. “This means that mortality is lower in the cities, so the advantages of city life compensate for the negative health effects,” explains Juan Diego Ibáñez-Álamo, a <a href="https://www.rug.nl/?lang=en">University of Groningen</a> postdoc researcher and lead author of the study. 

The reasons behind why the city birds seem to live longer, but are less healthy, is unknown. But it could potentially be because there is less predation and more food in cities. The researchers explain that the reason could also be that birds with short telomeres ended up living in the cities, and simply created a population characterized by short telomeres. But more research must be done before the implications of this study are fully known.

--

By <a href="mailto:certz@earth.com">Connor Ertz</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Richard Ubels / University of Groningen

City blackbirds live longer but have worse health

Would you rather live longer and be unhealthy, or have...

Scientists are scrambling to save the northern white rhino species after the last known male of the subspecies died on Monday. Sudan, the 45-year old rhino, was located in Kenya with the only two remaining northern white rhino females named Najin and Fatu.

In the 1960s, there were at least 2,000 northern white rhinos in areas such as Chad, Sudan, and <a href="https://www.earth.com/news/food-abundance-conflict-africa/">Africa</a>. Years of conflict and poaching drove this number down to only around 15 by the mid-1980s.

There was hope that mating would be successful among the last three northern white rhinos, who were protected from poachers by armed guards 24 hours a day at the Ol Pejeta Conservancy in Kenya.

George Paul, the deputy veterinarian at the conservancy, spoke to <a href="https://www.cnn.com/">CNN</a> about the issue last year.

“There has been recorded mating between different pairs over the last few years, but not conceptions,” said Paul. “Based on a recent health examination conducted, both animals have a regular estrus cycle, but no conception has been recorded.”

Paul explained to CNN that Sudan may have been unable to naturally mate with a female in his older age.

When the rhinos were moved to the conservancy in 2009, there was also one other northern white male named Suni, who passed away in 2014. 

At the time of Suni’s death, experts examined the remaining three rhinos and discovered that Sudan had a low sperm count and that both of the females had complications which would prevent them from reproducing naturally.

A <a href="http://createsend.com/t/r-6E48170C904A696A2540EF23F30FEDED">press release</a> which followed the examinations stated: “Artificial techniques of reproduction could provide the last chance of survival for the world’s most endangered mammal – the northern white rhino.”

Now, four years later, experts are still hoping that artificial reproduction may enable them to save the subspecies. 

Dr. Steve Ngulu, the veterinarian who was in charge of Sudan, told <a href="https://www.npr.org/">NPR</a> that scientists have sperm that was collected from Sudan and other northern male white rhinos.

According to Dr. Ngulu, the major challenge is to find an alternative to artificial insemination, since the female rhinos are unable to carry a baby to term.

He explained to NPR: “The only other option that we have to have a pure northern white rhino baby is to retrieve or to do something we call ovum pick-up, collect eggs from the females.”

The eggs would then be implanted into a healthy southern white rhino. There is also a chance of mating one of the two remaining females with a southern white male, if necessary, to salvage what is left of the northern white rhino species.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Earth’s last male northern white rhino has died

Scientists are scrambling to save the northern white rhino species...

Many people still seem surprised to learn that <a href="https://www.earth.com/news/agriculture-higher-methane-emissions/">methane emissions</a> from <a href="https://www.earth.com/news/cowspiracy-film-review/">cows</a> are a major contributor to climate change. But now, a new study has revealed that meat-heavy diets account for almost half of the food-related greenhouse emissions in the United States. 

Researchers from the <a href="https://umich.edu/">University of Michigan</a> and <a href="http://tulane.edu/">Tulane University</a> examined the carbon impact of typical diets in the United States and found that just 20 percent of Americans are actually responsible for half of diet-related greenhouse gas emissions.

“Previous studies of diet-related greenhouse gas emissions have focused mainly on the average diet in a given country,” said Diego Rose, the principal investigator on the project. “This study is the first in the United States to look instead at self-reported dietary choices of a nationally representative sample of thousands of Americans.” 

The study was published in the journal Environmental Research Letters.

For the study, the researchers created a database that calculated the environmental impacts involved in producing more than 300 types of foods.

The database was then linked to the findings of a nationally representative one-day dietary recall survey of more than 16,000 U.S adults. 

With both the database and survey, the researchers were able to rank different types of diets by their carbon footprint and the greenhouse gases they produced.

Diets that included a lot of beef or dairy had the highest impact and produced more greenhouse gases than the other diets. 

In total, 20 percent of the diets with highest carbon footprint produced 46 percent of total diet-related greenhouse emissions.

“A big take-home message for me is the fact that high-impact diets are such a large part of the overall contribution to food-related greenhouse gases,” said Martin Heller, the first author of the paper. 

The results show the high levels of emissions from the meat and dairy industry, and the researchers recommend that people with high impact diets reduce the amount of meat they consume as an easy and sustainable solution for reducing emissions. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Meat-heavy diets are a major contributor to greenhouse emissions

Many people still seem surprised to learn that methane emissions...

Researchers are describing how ancient creatures adapted arms and legs. The study demonstrates that fish, mice, and modern-day vertebrates share a genetic advantage that was used to build limbs.

Experts at the <a href="http://www.uchospitals.edu/index.shtml">University of Chicago Medical Center</a> are reporting that the unpaired dorsal fin in ancient fish was duplicated to produce paired appendages, like pelvic fins, arms, and <a href="https://www.earth.com/news/dinosaurs-evolved-running/">legs</a>.


“The unpaired dorsal fin is the first one you see in the fossil record,” said study co-author Neil Shubin. “Here we show that the genetic mechanisms that pattern all the fins and other paired appendages originally arose there and were redeployed to others.”

The research team performed genetic testing in mice and fish to examine the expression of Sonic hedgehog (Shh), which is a gene that is critical in the formation of limbs.

Mice have a type of on-and-off switch called ZRS that controls the expression of Sonic hedgehog. If ZRS is inhibited in a mouse, the limbs cannot properly develop.

The team used gene editing tools to knock out ZRS in a well-known aquarium fish that is known as a Japanese rice fish. Instead of influencing the development of the paired fins, the fish did not grow unpaired dorsal fins. Meanwhile, the paired pelvic and pectoral fins developed as expected.

The researchers examined potential other genetic enhancers and found a related "shadow enhancer" called sZRS that was a critical component working alongside the ZRS switch.

When ZRS and sZRS were suppressed in the medaka, both the dorsal fin and paired fins were lost. The researchers have determined that it is likely that ZRS was first used to develop dorsal fins, and later copied and reused as sZRS when paired fins first emerged about 475 million years ago.

“It's very ancient, and the sequence and function are conserved across all vertebrates,” said Shubin. “It turns out the primitive role for the ZRS was involved with the dorsal fin. It's only later that its activity in the paired fins required this other shadow enhancer.”

Shubin said that understanding the activity of these enhancers helps to identify the traces of evolutionary ancestors present in all vertebrates, including humans.

“A number of human maladies are based on mistakes in the ZRS that can lead extra or missing fingers, or changes in the shape of hands,” said Shubin.

“Humans probably have this shadow enhancer too, so if we want to study the dynamics of how this affects limb patterning, what we see in these fish models is a great place to start.”

The study is published in <a href="https://www.nature.com/ng/">Nature Genetics</a>.

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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, Earth.com Staff Writer

Dorsal fin marked the start of vertebrates growing arms and legs

Researchers are describing how ancient creatures adapted arms and legs....

More than 500 million years ago, a strange-looking sea creature – Kerygmachela kierkegaardi – roamed the Earth’s oceans. Now, researchers have found more than a dozen fossilized brains and eyes of the ancient ancestor of lobsters, spiders and other modern creepy crawlies.

The newly discovered fossils held a surprise for researchers, however. Until now, many scientists suspected that the common ancestor of vertebrates and arthropods – which would have been an ancestor of K. kierkegaardi, too – had a three-segmented brain, a trait most modern insects share with humans. 

But a research team led by Dr. Jakob Vinther of the <a href="http://www.bristol.ac.uk/">University of Bristol</a> and Dr. Tae-Yoon S. Park of the <a href="https://www.uarctic.org/member-profiles/non-arctic/28245/korea-polar-research-institute">Korea Polar Research Institute</a> discovered that this was not the case.

The collection of 15 fossilized brains, discovered in Greenland in 2011 and 2016, show that K. kierkegaardi’s brain had only one segment. That means the three-segmented brains seen in its modern relatives likely evolved later. It also means the shared ancestor of humans and insects probably didn’t have a three-segmented brain, either.

“It has been surmised, based on developmental evidence, that the ancestor of vertebrates and arthropods had a tripartite brain, which is refuted by the fossil evidence presented here,” the researchers wrote in their study, published in the journal <a href="https://www.nature.com/articles/s41467-018-03464-w">Nature Communications</a>.

K. kierkegaardi was about 10 inches long, oval-shaped, with 11 flaps for movement on each side, two long appendages on its head and a long tail. It lived between 521 and 514 million years ago, during the Cambrian explosion. It’s simple “protocerebral” brain may have helped it to survive the time period, when a large number of new animal species began to evolve, the scientists said.

The researchers also believe the fossils demonstrate a middle stage between simpler eye structures and the complex eyes found in modern insects like flies and spiders.

“You can call it a missing link as it contains feature that exists in living creatures, but not in previous fossils,” Vinther told the <a href="http://www.dailymail.co.uk/">Daily Mail</a>.

—

By <a href="mailto:kcathey@earth.com">Kyla Cathey</a>, <a href="http://www.earth.com">Earth.com</a> staff writer

Image credit: Rebecca Gelernter, <a href="http://www.nearbirdstudios.com/">Near Bird Studios</a>

The surprising fossilized brains of ancient sea creatures

More than 500 million years ago, a strange-looking sea creature...

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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



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Flu viruses are more flexible than expected

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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



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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



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How does salt makes things taste better?

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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



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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



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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 



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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



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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



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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

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