Elasmosaurus,,Group,Of,Long-necked,Plesiosaurs,From,The,Late,Cretaceous,Period,

Scientists have pieced together evidence that ancient marine reptiles once swam in what is now central Colombia, and these creatures appear to have been more formidable predators than today’s mighty killer whales.&nbsp;



Their presence at an unexpectedly high level in the food chain has raised new questions about how ocean ecosystems evolve.&nbsp;



Paleontologists reconstructed the lives of giant reptiles and invertebrates that flourished in a lush environment roughly 130 million years ago, and uncovered a glimpse of life that sits outside what is considered standard for our modern seas.



<h2 class="wp-block-heading" id="h-marine-reptiles-ruled-over-killer-whales-nbsp">Marine reptiles ruled over killer whales&nbsp;</h2>



Experts discovered that some of these reptiles could exceed 33 feet (10 meters) in length, hinting at a way of life that appears to have been <a href="https://www.earth.com/news/ecosystem-behavior-earth-first-sea-creatures-stirring-water-drove-evolution/" target="_blank" rel="noreferrer noopener">remarkably powerful</a>.&nbsp;



According to their research, these creatures ruled the seventh level in a reconstructed Cretaceous food web, while present-day killer whales and great white sharks rarely pass the sixth.&nbsp;



At the heart of these findings is work by McGill University’s <a href="https://www.mcgill.ca/biology/" target="_blank" rel="noreferrer noopener">Department of Biology</a>, led by doctoral student Dirley Cortés and co-author Hans Larsson, who is a professor in the same department.



<h2 class="wp-block-heading" id="h-marine-reptiles-reached-the-pinnacle">Marine reptiles reached the pinnacle</h2>



Large predators typically dominate the top ranks in any oceanic food chain. Scientists often call these ranks "<a href="https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Introductory_Biology_(CK-12)/06%3A_Ecology/6.05%3A_Trophic_Levels" target="_blank" rel="noreferrer noopener">trophic levels</a>." 



Modern <a href="https://www.earth.com/news/ancient-sunken-oceans-discovered-between-earth-core-and-mantle/" target="_blank" rel="noreferrer noopener">marine</a> systems reach a natural limit around the sixth trophic (or feeding) level, where species like orcas hover at the pinnacle of the energy pyramid.&nbsp;



“Our study is the first to examine these possible ecological interactions,” said Cortés, who is lead author on the publication. 



By <a href="https://academic.oup.com/zoolinnean/article/202/1/zlad092/7275647?login=false" target="_blank" rel="noreferrer noopener">studying</a> fossil evidence in the <a href="https://www2.sgc.gov.co/LibroGeologiaColombia/tgc/sgcpubesp36201913.pdf" target="_blank" rel="noreferrer noopener">Paja Formation</a>, the team determined that Mesozoic reptiles had apparently gone one level higher. 



These ancient animals likely feasted on anything in their path, which explains how their food web stacked up so high.



<h2 class="wp-block-heading" id="h-reconstructing-a-lost-food-web">Reconstructing a lost food web</h2>



This investigation on ancient marine reptiles used body size, possible feeding tools, and comparisons with existing marine species to build a detailed framework for who ate whom in that vanished Colombian sea, where the warm climates of the Early Cretaceous allowed a surge in ocean diversity.&nbsp;



The Paja Formation’s fossil record reveals predators with robust jaws and swift movement, alongside an assortment of invertebrates that thrived in trophic levels beneath them.&nbsp;



Researchers drew upon modern <a href="https://www.earth.com/news/coral-disease-is-pushing-caribbean-reefs-toward-extinction/" target="_blank" rel="noreferrer noopener">Caribbean reef</a> networks to cross-check their results. 



By comparing these fossils to present-day communities, the study uncovered what one of the paper’s authors described as "intricate links among prehistoric animals" that pushed the boundaries of the marine hierarchy.



“Understanding this complexity helps us trace how ecosystems evolve over time,” said Cortés.



<h2 class="wp-block-heading" id="h-how-competition-shaped-the-seas">How competition shaped the seas</h2>



Marine food webs do not form overnight. Competition for resources tends to bring about new evolutionary strategies and unique feeding habits. 



During parts of the Mesozoic, <a href="https://www.pnas.org/doi/10.1073/pnas.0501562102" target="_blank" rel="noreferrer noopener">pressure</a> from marine predators and their potential prey made survival an ongoing challenge. 



A known surge in shell-crushing snails and other predatory invertebrates during this era has been labeled by paleontologists as the <a href="https://www.cambridge.org/core/journals/paleobiology" target="_blank" rel="noreferrer noopener">Mesozoic Marine Revolution</a>.&nbsp;



Ancient marine reptiles from the Paja Formation existed in this tense <a href="https://www.earth.com/news/looking-to-earths-ancient-climate-to-predict-our-future/" target="_blank" rel="noreferrer noopener">environment</a> of changing prey, leading them to develop massive body sizes and formidable hunting styles.&nbsp;



“These findings illuminate how marine ecosystems developed through intense trophic competition and shaped the diversity we see today,” said <a href="https://academic.oup.com/zoolinnean/article/202/1/zlad092/7275647?login=false" target="_blank" rel="noreferrer noopener">Larsson</a>.



<h2 class="wp-block-heading" id="h-why-this-matters-today">Why this matters today</h2>



The close study of creatures that roamed the ocean so long ago is not just about cataloging exciting fossils. Discoveries like this tell us that life’s history is packed with surprising adaptations.&nbsp;



Paleontologists see a chance to compare these ancient networks with modern ones, thus providing fresh insights into how ecosystems recover from challenges such as climate change or habitat loss.&nbsp;



Researchers also note that these fossil communities remind us of how species at the top of the food chain can alter their entire environment, often making space for additional biodiversity.



<h2 class="wp-block-heading" id="h-a-window-into-evolution">A window into evolution</h2>



One important lesson from this work is that <a href="https://www.earth.com/news/ancient-climate-shift-sheds-light-on-future-global-warming/" target="_blank" rel="noreferrer noopener">dramatic shifts</a> in ocean biodiversity occurred long before humans entered the picture. 



Marine reptiles vanished near the end of the Mesozoic, but the legacy of their top-heavy food webs is imprinted in the fossil record. 



Each puzzle piece from that record, from large jaws to specialized teeth, helps paint a more accurate picture of how Earth’s seas matured. 



The high trophic levels in the Paja Formation suggest that new habitats were emerging, allowing marine reptiles to reach body sizes and predatory niches that are rarely matched in modern times.



<h2 class="wp-block-heading" id="h-ancient-marine-reptiles-and-ecosystems">Ancient marine reptiles and ecosystems</h2>



Researchers plan to keep building models for other fossil sites. This work may reveal whether seventh-level predators were uncommon or if there were other pockets in Earth’s history where they thrived. 



In many regions, marine formations remain poorly understood, so there is every chance that the Paja Formation was not the only site containing marine reptiles with astonishing hunting powers.&nbsp;



More studies may show that, over millions of years, seas can produce predators more fearsome than anything we know today.



The study is published in the <a href="https://academic.oup.com/zoolinnean/article-abstract/202/1/zlad092/7275647?redirectedFrom=fulltext&amp;login=false" target="_blank" rel="noreferrer noopener">Zoological Journal of the Linnean Society</a>.&nbsp;



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Top predators in prehistoric oceans would have eaten killer whales as snacks

Scientists have pieced together evidence that ancient marine reptiles once swam in what is now central Colombia, and these creatures appear to have been more formidable predators than today’s mighty killer whales.&nbsp; Their presence at an unexpectedly high level in the food chain has raised new questions about how ocean ecosystems evolve.&nbsp; Paleontologists reconstructed the lives of giant reptiles and invertebrates that flourished in a lush environment roughly 130 million years ago, and uncovered a glimpse of life that sits outside what is considered standard for our...

A new study from <a href="https://www.osaka-cu.ac.jp/en">Osaka City University</a> has revealed, for the first time, that <a href="https://www.earth.com/news/eating-fish-lowers-risk-of-recurrent-cardiovascular-events/">fish</a> can show compassion for each other through prosocial behavior. A team of experts led by Shun Satoh and Professor Masanori Kohda used a series of experiments to demonstrate that male convict cichlid fish have altruistic tendencies.

"Proactive prosociality, the spontaneous unsolicited help of a recipient, is currently rarely documented outside humans,' explained the study authors. "Prosocial behaviors arise from psychological motivation known as 'other-regarding preference,' where the immediate reward of the helping action is not material but has been called a 'warm glow' in humans," wrote the study authors.

"Most of the evidence outside humans has been collected using observational and experimental approaches on primates. In the standard experimental paradigm, the prosocial choice task (PCT), subjects can choose between an antisocial option that rewards only the actor and a prosocial option that rewards both the actor and others. If subjects consistently provide food to the recipient, then they are considered to be prosocial, although the help is cost-free in this paradigm."

The convict cichlids were given two choices: the antisocial option of receiving food for themselves alone or the prosocial option of receiving food for themselves and their partner.

The male cichlids were placed in an experimental tank next to a presentation tank. When a partner with whom the male fish had experience in raising children was in the presentation tank, the male fish actively made a prosocial choice so that both fish received food. When there was no fish introduced in the presentation tank, the male fish preferred neither the prosocial nor antisocial option. 

To investigate how this prosocial behavior may be influenced by the social context, the team changed the partners to rival males or females that the experimental male fish had never met before. 

The results showed the male cichlids actively chose the antisocial option of not feeding the rival male, yet selected the prosocial option of feeding the unknown female as if it was their own breeding partner. 

In a separate trial involved both the original paired female and the unknown female, the researchers found that in the absence of the paired female, the male fish made the prosocial choice to provide food for the unknown female. However, in the presence of the paired female, they made the antisocial choice.

"These PCT results mirror those from similar experiments with primates," said Dr. Satoh. "However, this is the first time that caring and misbehaving behavior has been observed in fish. No one had ever expected such delicate and exquisite social behavior from such a small fish."

According to Professor Kohda, the team will use more rigorous behavioral experiments in an effort to clarify whether the fish really have the intent to benefit others, and also to understand how the minds of the fish evolved to produce prosocial behavior. 

The study is published in the journal <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

Fish show they have compassion through prosocial behavior

A new study from Osaka City University has revealed, for...

In a new study from <a href="http://www.cnrs.fr/">CNRS</a>, experts describe winged sharks that lived in the Gulf of Mexico 93 million years ago. The newly discovered fossil species, Aquilolamna milarcae, had long and thin pectoral fins like manta rays.

"This previously unknown body plan represents an unexpected evolutionary experimentation with underwater flight among sharks, more than 30 million years before the rise of manta and devil rays, and shows that winglike pectoral fins have evolved independently in two distantly related clades of filter-feeding elasmobranchs," wrote the study authors.

The winged shark, nicknamed "eagle shark," was 1.65 meters long and had a span of 1.90 meters. It had a caudal fin with a well-developed superior lobe similar to a whale shark or a tiger shark. 

The anatomical features of A. milarcae give it a mythical appearance that combines both sharks and rays.

According to a team of researchers led by Romain Vullo, A. milarcae had a large mouth with very small teeth that were missing from the skeleton, which suggests that it fed on plankton. This is only the second group of large plankton feeders that are known to have lived during the Cretaceous Period. 

The study authors noted that the "bizarre" creature probably swam very slowly and was unlikely to have been able to hunt for food. "You could make the analogy of a glider... it wasn't at all adapted to swimming fast and following prey," said Vullo. 

The complete specimen of a winged shark was found in 2012 in Vallecillo, Mexico - a region that is known for remarkably preserved fossils. The site is famous for its many fossils of ammonites, bony fish and other marine reptiles. Vallecillo is very useful for documenting the evolution of oceanic animals.

The study is published in the journal <a href="https://www.sciencemag.org/">Science</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Bizarre, winged shark provides new clues about underwater flight

In a new study from CNRS, experts describe winged sharks...

In a new study published by <a href="https://www.wiley.com/en-us">Wiley</a>, experts have found that artificial light at night interferes with the courtship and mating of bioluminescent <a href="https://www.earth.com/news/tourists-who-are-flocking-to-see-fireflies-may-be-causing-them-harm/">fireflies</a>.

"Over the past century, widespread adoption of increasingly inexpensive and intense lighting technologies has significantly brightened urban and suburban environments, road networks, biodiversity hotspots, and even protected areas," wrote the researchers

"Artificial light at night (ALAN) significantly impacts the fitness of diverse nocturnal, crepuscular, and diurnal taxa - primarily by disrupting their orientation in space and time and by making it difficult for them to visually recognize predators, prey, or conspecifics."

According to the experts, bioluminescent insects that communicate through glowing lures, warning signals, or courtship displays may have their signals obscured by artificial illumination.

"Previous research has demonstrated that broad spectrum white light inhibits the production of courtship advertisements by male firefly beetles, yet the impact of varying wavelengths of artificial light on both members of the courtship dialogue is largely unknown," wrote the study authors. 

"We exposed courting pairs of Photinus obscurellus fireflies to five colors of downwelling illumination, at two intensities, and recorded changes in male flash rate and flash intensity, female responsiveness, and the flash pattern composition of both sexes."

The investigation revealed that all of the artificial light treatments significantly suppressed courtship activity, but bright amber light had the greatest impact. This indicates that artificial lights with colors similar to firefly bioluminescence may be the most disruptive to firefly courtship.

"It's definitely concerning, because many ecologically-minded people are pushing the use of amber lights to safely light up streets and parks. But we're finding that no color of light is safe for fireflies, they need the dark," said study co-author Avalon C.S. Owens.

The research is published in the journal <a href="https://onlinelibrary.wiley.com/journal/17524598">Insect Conservation and Diversity</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Artificial light interferes with firefly mating

In a new study published by Wiley, experts have found...

In the first study of its kind, an international team of scientists led by the <a href="http://www.reading.ac.uk/">University of Reading </a> has investigated insect pollinator stability over multiple years and sites worldwide. The experts found that crop pollination services are more stable in fields and farms with a greater variety of insect pollinators. 

The investigation showed that diverse communities of insect pollinators, and areas with stable populations of dominant species, can reduce year-to-year fluctuations in crop pollination.

The results suggest that supporting pollinator diversity could provide long-term benefits to food production.

"Most previous research into pollinator stability has focused on space, not time. However, year-to-year variations in pollination services cause boom and bust cycles in crop harvests, which can have a damaging impact on agriculture and livelihoods globally," explained study lead author Dr. Deepa Senapathi.

"Stable and consistent pollination services are therefore important in underpinning businesses and livelihoods, as well as providing a reliable supply of food for retailers and consumers."

"This study has revealed that the secret to consistent crop harvests could be to encourage pollinator diversity on or near farmland. If we want pollinators to help us, first we need to help them, through land management decisions that preserve and increase the number of insect pollinator species."

Insect pollinators support reproduction in at least 78 percent of wild plants, while contributing to the pollination of 75 percent of major crops. At the same time, wild insect pollinator populations are declining in areas of northwest Europe and North America, where crop production is widespread. 

It is becoming increasingly important to understand how plant pollinator populations change over time, as well as the associated impacts with their fluctuations.

For the current study, the researchers collected wild pollinator data from hundreds of field sites in 12 different countries across six continents over multiple years. The team studied populations of pollinating insects - including bees, hoverflies, butterflies, and beetles - in the vicinity of 21 different crop species.

The research confirmed that high pollinator diversity increases crop production. In intensive farming systems where there may be a reduced diversity of pollinators, the experts found that protecting the dominant species was also effective in providing long-term stability in pollination.

Further research is needed to determine which types of land management techniques are most effective for boosting insect diversity.

The study is published in the journal <a href="https://royalsocietypublishing.org/journal/rspb">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

Diverse insect pollinator communities boost crop production

In the first study of its kind, an international team...

In a new study from <a href="https://www.lancaster.ac.uk/">Lancaster University</a>, researchers have demonstrated that the <a href="https://www.earth.com/news/parasites-influence-mate-selection-and-evolution-of-barn-swallows/">parasite</a> Leishmania infantum can alter the scent of its host. The experts report that dogs infected with the parasite smell more attractive to female sand flies than males.

In Brazil, the parasite Leishmania infantum is transmitted by the bite of infected female Lutzomyia longipalpis sand flies. There are up to 300,000 new cases of leishmaniasis every year. 

Leishmania parasites are transmitted from infected dogs to people by sand flies when they bite. Visceral leishmaniasis affects the internal organs and can be fatal. In Brazil alone, approximately 4,500 people die each year from the visceral form of the disease.

"In this study we showed that infected dog odor is much more attractive than uninfected dog odor to the female sand flies. Only the females can transmit the pathogen and male sand flies, which do not transmit the parasite, are not affected by the changed odor," said study lead author Professor Gordon Hamilton. 

"This clear-cut difference in attraction of female and male sand flies suggests that the females are preferentially attracted by parasite infected hosts and this could lead to enhanced infection and transmission opportunities for the parasite."

The Lancaster team had previously determined that dogs infected with Leishmania parasites smelled different than uninfected dogs.

"Domestic dogs are the reservoir of infection, therefore understanding how the infection affects the attractiveness of dogs to the insect vector is important in understanding the epidemiology of the disease and offers opportunities for new control and diagnostic methodologies," explained Professor Hamilton.

The researchers collected odors from infected and uninfected dogs in a Brazilian city. The study revealed that female sand flies were more attracted to the odor of infected dogs compared to uninfected dogs. 

According to the study authors, the findings provide strong evidence that parasites manipulate the odor of their hosts, potentially enhancing infection and transmission opportunities for the pathogen.

"This demonstration of the parasite's manipulation of its host's odor, to potentially improve its transmission opportunity, will help us to understand the epidemiology of the disease, improve existing control strategies as well as develop new methodologies for control and diagnosis," wrote the researchers.

The study is published in the journal <a href="https://journals.plos.org/plospathogens/">PLOS Pathogens</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Parasites make dogs smell enticing to infectious sand flies

In a new study from Lancaster University, researchers have demonstrated...

A new study from <a href="https://www.dur.ac.uk/">Durham University</a> reveals evidence that two infant bonobos may have been adopted by adult <a href="https://www.earth.com/news/blue-orchard-bees-respond-to-fires-by-producing-more-females/">females</a> belonging to different social groups. This is the first time that bonobos, or any type of wild apes, have been known to adopt infants who were born outside of their social group.

According to the researchers, their findings give us greater insight into the parental instincts of one of humans' closest relatives and could help to explain the emotional reason behind why people readily adopt children who they have had no previous connection with.

Study lead author Dr. Nahoko Tokuyama of Kyoto University has spent more than ten years studying bonobos in the Democratic Republic of Congo. She said that bonobos never cease to amaze.

"Although cases of adoption were observed in non-human primates, the adoptive mother and adoptees almost exclusively belonged to the same social group," said Dr. Tokuyama.

"This may be because adoption is very costly behavior and because non-human primates form stable groups and have a good ability to recognize other group members.

"It's well known that groups of bonobos sometimes encounter and associate with each other, and that those belonging to different groups can interact tolerantly."

"However, I had never imagined that bonobos could adopt infants from outside of their groups, so these cases were quite surprising."

The experts observed four groups of wild bonobos between April 2019 and March 2020 in the Luo Scientific Reserve. The researchers identified two infants that appeared to have been adopted by female bonobos from separate social groups.

The adults, 18-year-old Marie and 52-57-year-old Chio, were seen providing maternal care to 2.6-year-old Flora and three-year-old Ruby. The adults were observed carrying, grooming, nursing,  and nesting with the young bonobos for periods longer than 12 months.

There was no aggression between members of Marie and Chio's social groups toward the young children. Furthermore, mitochondrial DNA samples revealed that the caregivers were not maternally related to the infants.

The researchers said this caring nature is evidence of bonobos' strong attraction to infants and high tolerance of individuals, including immature youngsters, from outside of their normal group.

"Usually in wild animals adoptive mothers are related to orphaned infants or sometimes young females will adopt orphans to improve their own care-giving behaviours, which increases the future survival chances of their own offspring," explained study co-author Marie-Laure Poiret.

"This means that adoption in non-human animals can usually be explained by the adoptive mother's own self-interest or pre-existing social relationships."

"The cross-group adoption we have seen in the cases of both Chio and Ruby, and Marie and Flora, is as surprising as it is wonderful and perhaps helps us explain adoption among humans, which cannot be explained purely by the benefits received by adoptive mothers."

"Instead it is fair to say from the examples we have seen in bonobos that adoption in humans can be explained by a selfless concern for others and an emotional desire to offer care to someone who we have no previous connection with."

The researchers suggest that the potential adoptions may have been driven by bonobos' altruism, strong attraction to infants, and high tolerance towards individuals outside of their own social group.

The study is published in the journal <a href="https://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

Wild bonobos adopt infants outside of their social group

A new study from Durham University reveals evidence that two...

Prior to the development of sophisticated tracking devices, the movements of animals in the <a href="https://www.earth.com/news/crystals-from-earths-magma-ocean-found-in-greenland-rocks/">ocean</a> were largely unknown. According to a new study from <a href="https://www.cell.com/">Cell Press</a>, tracking technology has revealed some unexpected circling behavior among marine mammals. 

The experts report that all types of marine mammals, ranging from green sharks to penguins, apparently swim in circles. At this point, the researchers do not have an explanation for this mysterious behavior.

"We've found that a wide variety of marine megafauna showed similar circling behavior, in which animals circled consecutively at a relatively constant speed more than twice," said study lead author Tomoko Narazaki of the University of Tokyo.

The experts first discovered the circling movements in homing green turtles during a displacement experiment. The tracking study was designed to test the navigational skills of the animals, and nesting green turtles had been transferred from one location to another.

"To be honest, I doubted my eyes when I first saw the data because the turtle circles so constantly, just like a machine!" said Narazaki. "When I got back in my lab, I reported this interesting discovery to my colleagues who use the same 3D data loggers to study a wide range of marine megafauna taxa."

The study authors were stunned when they realized that various species of marine animals showed more or less the same circling behavior. The discovery is surprising, considering that swimming in a straight line is the most efficient way to travel. This indicates there must be some strategy involved in circling. 

The researchers observed some circling events at foraging areas, which suggests that the movements are somehow helpful in finding food. The team tracked a total of 272 circling events among four tiger sharks tagged off Hawaii. On the other hand, fur seals were found to use circling behaviors during the day, yet they feed mostly at night. 

There were also other circling events that appeared to be unrelated to foraging. For example, a male tiger shark circled around a female that he was approaching for courtship. Meanwhile, the evidence from the sea turtle study suggests that circling plays a role in navigation.

"What surprised me most was that homing turtles undertake circling behavior at seemingly navigationally important locations, such as just before the final approach to their goal," said Narazaki.

According to the researchers, it is possible the circling helps the animals to detect the magnetic field to navigate, just as submarines circle during geomagnetic observations. It is also quite possible that the circling serves more than one purpose.

The researchers noted that studies of such fine-scale movements, including circling, in more marine species might reveal important behaviors that have otherwise been overlooked. 

The study is published in the journal <a href="https://www.cell.com/iscience/home">iScience</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Mysterious circling behavior discovered among marine mammals

Prior to the development of sophisticated tracking devices, the movements...

Bottlenose dolphins adjust their <a href="https://www.earth.com/news/irregular-sleep-linked-to-depression-and-mood-issues/">behavior</a> to cope with coastal development, according to a new study published by <a href="https://www.frontiersin.org/">Frontiers</a>. The researchers found that dolphins adapted to the construction of a bridge by establishing feeding locations outside of the construction zone, and by shifting their activities to a time of day when construction was minimal.

Overall, 47 percent of coastal marine mammal species and 51 percent of their core habitats are exposed to human disturbances. Coastal development and other human activities can cause cumulative harm to wildlife through consequences such as pollution, vessel strikes, entanglement, and debris ingestion.&nbsp;

Two of the most harmful activities to marine life are dredging and pile driving. The removal of sediment and debris from bodies of water, or dredging, is lethal to fish eggs and larvae. Pile driving causes severe noise pollution, which disrupts animals that depend on sound to navigate, forage, dodge predators, and communicate.

Due to unprecedented levels of construction, coastal zones are becoming the noisiest and most endangered ecosystems on the planet, according to the study. Bottlenose dolphins are particularly vulnerable to the cumulative effects of human activities because they are strongly tied to their coastal habitats.

Dr. Ann Weaver set out to investigate how bottlenose dolphins were impacted by a bridge replacement project in John's Pass, St Petersburg in west central Florida. The bridge replacement project occurred in two phases over a five-year period.

The construction involved dredging and pile driving and caused both light and noise pollution. The study revealed two ways in which dolphins appeared to adapt to these human activities.&nbsp;

First, the dolphins stopped using John's Pass as a feeding ground, and shifted to areas outside of the construction zone. This led to a decrease in social interactions between dolphins in that region. The behavioral changes persisted five years after construction was finalized, and never recovered.

Furthermore, during the first phase of construction, the dolphins shifted certain activities to a time in the day when construction was minimal. By the second phase of construction, the dolphins appeared to have learned to cope with human disturbance, and their behavior returned back to normal.&nbsp;

"Adaptation may also have been related in part to the way construction was managed," said Dr. Weaver. "This two-phase exposure to construction may have allowed the dolphins to become familiar with construction in the first phase and perhaps enabled them to adapt a 'new normal' during the second phase."

"These results provide a two-sided key to managing future coastal construction projects by mandating the following conservation policies. First, study the wildlife before construction begins to learn their habits. Second, apply that knowledge: Plan coastal construction activities accordingly to give them a chance to adapt and help the dolphins maintain their historic habits as much as possible."

The study is published in the journal <a href="https://www.frontiersin.org/journals/marine-science">Frontiers in Marine Science</a>.

---

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

Dolphins change their behavior to adapt to coastal development

Bottlenose dolphins adjust their behavior to cope with coastal development,...

Seaweed supplements can reduce livestock <a href="https://www.earth.com/news/the-moon-controls-methane-emissions-from-the-arctic-ocean/">methane</a> emissions without affecting meat quality, according to a new study published by <a href="https://plos.org/">PLOS</a>. The researchers found that feeding red algae to beef cattle lowered methane emissions by more than 50 percent. 

Sheep and cattle produce methane as a byproduct of digestion, which makes livestock farming a major source of greenhouse gas emissions worldwide.

A team led by Breanna Roque at the <a href="https://www.universityofcalifornia.edu/">University of California</a> set out to investigate whether red seaweed supplements could potentially reduce methane emissions produced by beef cattle.

The study was focused on 21 Angus-Hereford beef bullocks, who were fed their usual diet of hay, grains, and corn. The diets were supplemented with either zero, low, or high concentrations of red seaweed. 

The experts periodically measured the levels of methane, hydrogen, and carbon dioxide released by the young bulls for 21 weeks. The study revealed that the supplements reduced methane emissions by between 45 percent and 68 percent. 

The greatest reductions were associated with a high seaweed-supplemented, low-forage diet. This diet was found to reduce methane production by as much as 80 percent.

Testing showed that the seaweed supplements had no effect on the quality or flavor of the meat. In addition, the bulls sustained normal growth rates while consuming less food. This indicates that red seaweed supplemented diets could help farmers improve efficiency, reduce costs, and reduce methane emissions simultaneously, explained the researchers.

"There is more work to be done, but we are very encouraged by these results," said Roque. "We now have a clear answer to the question of whether seaweed supplements can sustainably reduce livestock methane emissions and its long-term effectiveness."

The study is published in the journal <a href="https://journals.plos.org/plosone/">PLOS ONE</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

Seaweed supplements reduce livestock methane emissions

Seaweed supplements can reduce livestock methane emissions without affecting meat...

Elephant seals take more risks when their body <a href="https://www.earth.com/news/women-who-are-physically-fit-burn-fat-faster/">fat</a> is lowest, and strategically change their behavior as their body condition improves, according to a new study from <a href="https://www.ucsc.edu/">UC Santa Cruz</a>. The research shows that when they have more fat stored up, the seals prioritize safety over feeding.

The investigation is the first of its kind to continuously measure changes in behavior relative to body fat, and provides new insight into how wild animals balance risks and rewards.

"Theory predicts that fat animals take fewer risks, but it's very difficult to measure body condition continuously in wild animals," said study first author Professor Roxanne Beltran. "Our results show that fat seals prioritize safety, and skinny seals prioritize feeding."

Each year in May, female elephant seals leave the beaches in California where they gove birth and nurse their young to set out on a seven-month foraging trip across the Pacific Ocean. As they hunt for fish and squid, the seals must avoid becoming prey themselves.

The researchers used satellite tags and time-depth recorders to track the movements and diving patterns of 71 adult female northern elephant seals. Their intense migration covers about 6,000 miles, and invloves an uninterrupted series of dives. The seals average 23 minutes per dive with just two minutes at the surface between dives.

The elephant seals minimize their time at the surface to avoid attacks by sharks and killer whales. Because these are visual predators, the seals are safer in water depths that light does not penetrate. The researchers refer to this phenomenon as "lightscapes of fear" that shape animal behavior in the open ocean.

"We don't know a lot about predator-prey dynamics in the open ocean because there are so few sightings of attacks, but we regularly observe elephant seals on the beach with shark bites," said Professor Beltran.

The tracking data revealed several different types of dives, including foraging dives, when the seals pursue prey; transit dives with no feeding activity; and rest dives, when the seals drift passively at the bottom of the dive and are presumably sleeping.

During the drift dives, the researchers can calculate how much body fat the seals have based on their buoyancy in the water.

"It gives us a nearly continuous record of how fat they are, which is unparalleled for any wild animal other than elephant seals," said Professor Beltran. "At the beginning of the migration, they are really skinny and they sink through the water column. As the feeding migration progresses, they slowly gain weight and their buoyancy becomes less negative until, at some point, they switch to positive buoyancy and stay positive for the rest of the trip."

The timing of the resting dives were found to change as the seals' body condition improves. Seals in poor condition started their drift dives just after sunrise, while seals in good condition started their drift dives just before sunrise. As a result, the amount of time the seals rested during the dangerous daylight hours decreased from 80 to 30 percent.

The drift dives occurred progressively earlier with respect to sunrise as the seals' body condition improved throughout the migration. This indicates a shift in their priorities from feeding to safety. 

"Light is a fundamental environmental constraint that these animals are using strategically to maximize rewards and minimize risks," said Professor Beltran. "In the ocean, light is an interesting way to look at risk-reward tradeoffs because it integrates time and space, especially for a migratory species that travels across time zones and latitudes with constantly changing day lengths."

The study is published in the journal <a href="https://advances.sciencemag.org/">Science Advances</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

Elephant seals take more risks when they are low on body fat

Elephant seals take more risks when their body fat is...

Rare birds are being pushed out of their habitats in Colombia, which is home to more bird species than any other place on the planet. A new study from the <a href="https://www.uq.edu.au/">University of Queensland</a> shows that <a href="https://www.earth.com/image/deforestation-continues-across-indonesian-islands/">deforestation</a> is increasingly destroying the historical habitats of hundreds of types of birds. 

The investigation was focused on the impact of deforestation on 550 bird species, including 69 species that are only found in Colombia.

"Our study has shown an astonishing reduction in bird species habitat," said study lead author Dr. Pablo Negret."One third of the forest bird species in Colombia have lost at least a third of their historical habitat, and that's just using the most recent data we have available - from 2015."

"Moreover, 18 percent or 99 species have lost more than half of their historical habitat to date. By 2040, we expect this will increase to 38 percent or 209 species."

"Sadly, many of those species are endemic to the country and are not currently classified as threatened by the International Union for Conservation of Nature, suggesting that there are many unlisted species that face an imminent extinction threat from ongoing habitat loss."

Dr. Negret said the results are concerning but not surprising, as deforestation is one of the main drivers of habitat loss for many species in the tropics.

"We know that deforestation affects thousands of species in these ecosystems, but our attention is usually focused on a tiny fraction - threatened and charismatic species," explained Dr. Negret.

"This study provides more data on species previously thought abundant that are actually dwindling - hopefully we can shine a light on them, so they can be recognized as under threat and don't fall through the cracks."

The researchers used historical and present satellite data to analyze changes in forest cover. They also looked at geographic information on other variables associated with deforestation patterns.

According to study co-author Professor Martine Maron, the research will help predict future habitat loss for already-threatened species.

"This methodology, and the technologies behind it, allow us to identify places where future habitat loss is predicted," said Professor Maron.

"This means that we can reveal the locations where threatened species are most likely to lose precious habitat, and prioritise their protection. And, in a country with growing threats to rich bird diversity, it pays to be ahead of the game."

The researchers hope the Colombian government and NGOs working in this region will use their findings to guide conservation and provide protection for Colombia's birds.

The study is published in the journal <a href="https://www.journals.elsevier.com/biological-conservation">Biological Conservation</a>.

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

"Astonishing reduction" in bird habitats found in Colombia

Rare birds are being pushed out of their habitats in...

In a new report from <a href="https://www.ucdavis.edu/">UC Davis</a>, experts have discovered that "total eradication" is not the best approach to target <a href="https://www.earth.com/news/invasive-species-are-driving-rapid-evolution/">invasive species</a>. According to the researchers, lessons learned from a failed experiment are leading to more successful strategies for controlling non-native species. 

"A failure in science often leads to unexpected directions," said study lead author Professor Edwin Grosholz. "We slapped our foreheads at the time, but with thought and understanding, it's told us a lot about what we shouldn't be doing and provided a way forward for us. The world should get less focused on total eradication and work toward functional eradication."

The researchers consider functional eradication to be a much more effective approach to invasive species management. This technique was described in a previous study led by the University of Alberta and co-authored by Professor Grosholz.

In 2009, intensive efforts were focused on fully eradicating the European green crab from Stinson Beach's Seadrift Lagoon in California. This crab costs the U.S. commercial shellfish industry about $20 million in losses every year. 

By 2013, 90 percent of the crabs had been removed from the estuary, and the population had dropped from 125,000 to fewer than 10,000 individuals. A year later, however, the population had exploded to about 300,000 green crabs - nearly triple the pre-eradication population size.

The scientists were monitoring four additional neighboring bays, and no such population explosions of the green crab were observed at those sites. This finding indicates that the increase in crabs was the result of eradication efforts and not environmental changes.

The experts determined that the population explosion in the Seadrift Lagoon was due in part to the fact that the adult crabs typically cannibalize younger individuals. With most of the adults removed, juveniles grew unchecked and overcompensated for the loss of adults.

The study serves as a precautionary tale for natural resource managers. "Don't try to get them all, or it could come back to bite you," said Professor Grosholz.

"Instead of a one-size-fits-all approach, this study highlights the need to evaluate possible unintended consequences in selecting management strategies and tailoring these to the particular context and expected outcome," said study co-author Greg Ruiz.

Just as researchers described in the Alberta-led study, the UC Davis team recommends a "Goldilocks level" approach, where the population is low enough to protect native species without risking a population explosion of the invasive species.

The study is published in the journal <a href="https://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

Total eradication is not the best approach to invasive species

In a new report from UC Davis, experts have discovered...

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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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