Just imagine a world where humans no longer exist, who would take over? Well, it may not be another mammal. Believe it or not, octopuses could be the ones to dominate Earth after humans. 



Scientists have recently made a riveting claim that these eight-limbed, marine invertebrates could become the dominant species on Earth should homo sapiens vanish from existence. It's an intriguing idea, but how is it possible?



<h2 class="wp-block-heading" id="h-hypothetical-world-without-humans">Hypothetical world without humans</h2>



What if humanity were utterly wiped out through wars or climate change? It's a grim concept but it is fascinating to wonder about the <a href="https://www.earth.com/news/octopus-arms-inspire-more-human-like-robots/" target="_blank" rel="noreferrer noopener">potential successors</a> of our civilization.



According to leading experts, octopuses possess the "physical and mental attributes necessary" to evolve into the next civilization-building species.



<h2 class="wp-block-heading" id="h-octopus-taking-over-humans">Octopus taking over humans</h2>



Tim Coulson, a professor at the <a href="https://www.ox.ac.uk" target="_blank" rel="noreferrer noopener">University of Oxford</a>, presents an interesting case for these eight-legged creatures. His argument hinges on the octopuses' "dexterity, curiosity, ability to communicate with each other, and supreme intelligence."



These traits, according to Professor Coulson, equip octopuses with the potential to develop complex tools and methodologies necessary to birth a vast Atlantis-like civilization under the ocean.



<h2 class="wp-block-heading" id="h-why-not-primates">Why not primates?</h2>



One might think that primates, our closest relatives, have the best shot at stepping into our shoes if we were to vacate the world. They have opposable thumbs, use tools, and walk on two legs, right? But according to Professor Coulson, it's not that simple. 



He reasons that primates would face the same threats that could potentially wipe out humanity and thus are also at risk of extinction.



<h2 class="wp-block-heading" id="h-octopuses-competing-with-humans">Octopuses competing with humans</h2>



In an interview with The European magazine, Professor Coulson, who has held positions at institutions like <a href="https://www.imperial.ac.uk" target="_blank" rel="noreferrer noopener">Imperial College London</a> and <a href="https://www.cam.ac.uk" target="_blank" rel="noreferrer noopener">Cambridge University</a>, elaborates on why octopuses are a strong contender.



He refers to them as "the most intelligent, adaptable, and resourceful creatures on Earth," lauding their abilities to solve complex problems, manipulate objects, and even camouflage themselves with near-perfect precision.



Their decentralized nervous system and advanced neural structure, coupled with their exceptional problem-solving skills, make octopuses uniquely suited for an unpredictable world. 



Professor Coulson sees these intelligent cephalopods as an underappreciated contender who could step up as the planet's next intelligent species after humans.



<h2 class="wp-block-heading" id="h-adaptable-survivalists">Adaptable survivalists</h2>



If humans were to go extinct, most scientists concur that the creature to "replace" us should be dextrous. Dexterity, in this context, pertains to the ability to modify their environment and colonize the planet using complex tools, much like humans.



Octopuses' abilities to distinguish between real and virtual objects, solve puzzles, manipulate their surroundings, and adapt to a broad range of environments make them a viable candidate for future rulers of Earth. 



They are also adept at surviving in harsh conditions and are formidable hunters with a wide variety of prey including clams, shrimp, lobsters, fish, sharks, and even birds.



<h2 class="wp-block-heading" id="h-octopuses-and-human-like-settlements">Octopuses and human-like settlements</h2>



With relatively short lifespans, from between 1.5 to five years, one could argue that <a href="https://www.earth.com/news/the-octopus-has-mastered-the-art-of-multispecies-hunting/" target="_blank" rel="noreferrer noopener">octopuses</a> are on the back foot for the long evolutionary race. But here's a counterintuitive thought. 



What if their hasty reproduction and quick intellectual maturity actually give them an advantage in rapidly changing environments, thereby accelerating their evolutionary progress?



According to our Professor Coulson, while octopuses are unlikely to evolve into land-based animals due to their lack of a skeleton and associated challenges with mobility out of water, they could potentially develop underwater cities and towns akin to human settlements on land.



<h2 class="wp-block-heading" id="h-possible-yes-probable-maybe">Possible? Yes. Probable? Maybe.</h2>



In the end, as Professor Coulson reminds us, these are all just speculations. "It's important to remember that these are just possibilities, and that it's impossible to predict with any degree of certainty how evolution will unfold over extended periods."



However, given the <a href="https://www.earth.com/news/octopus-suckers-the-future-of-underwater-adhesives/" target="_blank" rel="noreferrer noopener">octopuses</a>' remarkable intelligence, adaptability, and diverse range of survival strategies, they could indeed emerge as a potential successor to humanity.



Now, whether the octopuses would build vast underwater cities or venture onto land to hunt terrestrial mammals is yet to be determined, and we may never really know.



For now, we will continue to marvel at these fascinating creatures and their potential for becoming the torchbearers of intelligent life on Earth, albeit in the far-flung future.



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Octopuses could dominate Earth if humans vanish

Just imagine a world where humans no longer exist, who would take over? Well, it may not be another mammal. Believe it or not, octopuses could be the ones to dominate Earth after humans. Scientists have recently made a riveting claim that these eight-limbed, marine invertebrates could become the dominant species on Earth should homo sapiens vanish from existence. It's an intriguing idea, but how is it possible? Hypothetical world without humans What if humanity were utterly wiped out through wars or climate change? It's a grim...

Proboscis monkeys are fascinating to tourists, and perhaps even more so than other monkeys due to their oversized noses. Areas along rivers are popular for tourists visiting Sabah Malaysia because they can approach monkeys and other <a href="https://www.earth.com/news/wildlife-may-be-the-answer-to-dwindling-fertilizer-ingredient/">wildlife</a> via motor boat.&nbsp;



Tour boats move quickly and loudly through the forest and toward the monkeys, approaching at close proximities. Now, new research led by the <a href="https://www.port.ac.uk/">University of Portsmouth</a> shows that proboscis monkeys are often stressed by the arrival of these tour boats.&nbsp;



“Our evidence shows that even a single motor boat moving slowly, with humans behaving calmly, can negatively affect the primate’s behavior and induce stress - an impact that is likely to be larger with tourist boats," said study lead author Dr. Marina Davila‐Ross. "The riparian area is an important habitat that has become increasingly popular to primate ecotourism, because it enables tourists to conveniently reach primates via motor boats.”



The scientists carried out the research by driving motorboats toward the monkeys at various speeds and distances. Under the conditions of fast and close, slow and close, or far and fast, the monkeys exhibited stress behaviors.



"Collectively, our findings suggest that the approach of a single motor boat induces stress in proboscis monkeys when approaching them as closely as 60 meters from the other side of the river, regardless of the speed of approach," said&nbsp;



Dr. Davila‐Ross.



"The findings match those obtained in studies on sea mammals and birds, suggesting that stress is a universal response across animals when a boat approaches - a large, loud, and artificial object moving toward them is likely to be threatening.”



The stress can potentially cause the monkeys to move into more dangerous territory. For example, a monkey leaving a safe spot close to nightfall might be more vulnerable to predators and other threats.&nbsp;



“Our study highlights the importance of keeping a distance from proboscis monkeys and perhaps also other primates in the riparian area when in motorboats, and preferably approaching them similarly as in the slow-far condition, where we observed no impact," said Dr. Davila‐Ross. "Such information might be helpful for tourists, allowing them to modify their behaviours when visiting the primates and when encouraging guides to follow the guidelines.”The researchers suggest that guidelines for tourist boats visiting proboscis monkeys should be enacted. Ideally, boats would move no more than 4 km/hr within 100 meters of monkeys and, most importantly, come no closer than 60 meters.&nbsp;&nbsp;



The study is published in the <a href="https://www.springer.com/journal/10764">International Journal of Primatology</a>.



---



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

Proboscis monkeys are stressed out by tourist boats

Proboscis monkeys are fascinating to tourists, and perhaps even more...

Vervet monkeys are clever enough to determine the optimal <a href="https://www.earth.com/news/study-uncovers-4000-years-of-foraging-behavior-among-albatrosses/">foraging</a> route that helps them to avoid stronger rivals, according to a new study. The experts found that the monkeys wait until their dominant group mates are too far away to interfere, selecting the shortest route to reach successive food sites and then leisurely snacking at each stop.&nbsp;



The vervets appear to assess the time that they will have before the more dominant monkeys return, and choose the best route to minimize their travel distance while maximizing food intake.&nbsp;



Study co-author Dr.&nbsp; Julie A. Teichroeb is an associate professor in the Department of Anthropology at the University of Toronto Scarborough.



“Here we show that vervet monkeys make foraging decisions that minimize travel time and distance, but also ensure they get access to their preferred food rewards when competitors are present," saps Dr. Teichroeb.



The results indicate that vervets have the cognitive ability to plan the ideal foraging route according to how much time they have. In humans, such strategies are related to rational thinking.&nbsp;



The researchers conducted experiments to study wild vervet monkeys in central Uganda. The experts were able to distinguish between 44 individuals based on their faces, fur color, and other natural markings.



“In previous work we have shown that vervets faced with a similar foraging problem immediately rush for preferred food sites when a competitor is present, but take the route that minimizes travel distance between food sites when foraging alone. In this feeding array, that would be to start at the nearest platform, then move along the outside of the array and only take the banana when it was encountered," explained Dr. Teichroeb.



“However, the large sample size in the present study allowed us to show that vervet foraging decisions were much more complex than the above simple dichotomy.”



The vervet monkeys selected the route that minimized travel distance when no group mates were near. When the stronger rivals were nearby, the monkeys quickly assessed the risk of competition and modified their route.&nbsp;



“When the competitor was at the array with them at the onset of the trial, the vervets took the hurried solution and immediately rushed to the banana, retrieving and eating it quickly. They also made a beeline for the banana when there was a high risk of competition," said study first author Dr. Jean Arseneau-Robar.



“This was the case if the dominant had short travel distance to travel time, or if the focal vervet was unskilled at retrieving the banana. But if the latter had a bit more time, he or she would stop to eat from a corn platform en route to the banana.”



Adults males who outranked the other members of the group did not bother to assess which food sites to visit, as they did not have to worry about competition.



“The adult males only needed to decide which food patches they wanted, and which patches they would let other group members have," said Dr. Arseneau-Robar.



According to Dr. Teichroeb, the findings show how incredibly complex foraging decisions can be in vervet monkeys.&nbsp;



"Decision-makers are taking in a lot of ecological and social information, while also considering their own current food-handling skill, and synthesizing this all very quickly before executing their route decision. And they are very good at making the best decisions, as they manage to get their preferred food in the vast majority of cases, even when under pressure.”



The study is published in the journal <a href="https://www.frontiersin.org/journals/ecology-and-evolution">Frontiers in Ecology and Evolution</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

Vervet monkeys use a clever strategy to outsmart their rivals

Vervet monkeys are clever enough to determine the optimal foraging...

In a new study from the <a href="https://www.utah.edu/">University of Utah</a>, researchers have found that some mammals drastically shift the timing of their daily activities in urban <a href="https://www.earth.com/news/baboons-behave-differently-in-urban-areas/">environments</a>. The experts say that this is likely to minimize encounters with humans.



"Wildlife are under continuous pressure to adapt to new environments as more land area is converted for human use and human populations continue to concentrate in suburban and exurban areas," wrote the study authors. "This is especially the case for terrestrial mammals, which are forced to navigate these habitat matrices on foot. One way in which mammals may occupy urbanized landscapes is by altering their temporal activity behavior."



In collaboration with community volunteers, the team set up a network of more than 300 trail cameras throughout urban sites in the Salt Lake Valley, as well in the Uinta-Wasatch-Cache National Forest. The cameras documented almost 20,000 sightings of mammals during the summer months of 2018 and 2019. The most abundant animals were coyotes, mule deer, raccoons, squirrels, and skunks.



The footage revealed that mammals in the city behaved very differently from their country relatives. Coyotes shifted their activities into the nighttime hours, while deer and squirrels moved their activity to daytime hours. In the forest, the squirrels, deer, and coyotes were most active at dawn and dusk.&nbsp;



According to the researchers, these behavioral shifts have consequences for interactions between species. Squirrels adopted a schedule that decreased their interaction with humans, but deer increased their human interaction. In addition, coyotes had less interaction with both deer and squirrels, reducing the availability of their prey.&nbsp;



"Typically, studies have found that mammals increase their nocturnal activity within urbanized environments to avoid overlap with humans," wrote the researchers. "However, to date, the majority of studies on this topic have focused on single species, and studying whether this trend holds across an entire community has important ecological implications."



"Specifically, understanding how differences in species temporal activity response alters predator-prey dynamics and sympatric interspecies competition can provide insight into urban wildlife community assembly and provide a mechanistic understanding of species co-occurrence within these systems."



The study is published in the journal <a href="https://www.journals.elsevier.com/global-ecology-and-conservation">Global Ecology and Conservation</a>.



---



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

Mammals change their schedules to adapt to city life

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

Around the world, bees are facing many threats, including toxic pesticides, climate change, disease, and habitat loss. An international research team led by <a href="https://www.uni-wuerzburg.de/en/home/">Julius-Maximilians-University</a> (JMU) Würzburg has investigated the impact of pesticides on the reproduction of wild bees. The experts have discovered that pesticide exposure interferes with <a href="https://www.earth.com/news/lunar-cycles-have-a-secret-influence-on-human-reproduction/">reproduction</a> among wild bees in the very earliest phase - the mating phase.&nbsp;



The results of the study revealed that exposure to agrochemicals reduces the fitness of both male and female bees. This indicates that the decline of wild bees in agricultural areas may be the result of their reduced fertility due to pesticides.



To identify the factors that may be contributing to the decline of wild bees, the researchers focused on the early stages of the insects' reproduction. They exposed horned mason bees to a non-lethal dose of the fungicide fenbuconazole. When choosing a partner to mate with, female mason bees evaluate males based on signals such as their odor and thoracic vibrations.&nbsp;



"If the fungicide has an effect on male quality signals, this should increase the likelihood that pesticide-exposed males will be rejected by females," explained study lead author Samuel Boff.&nbsp;



"We also found that the pesticide-exposed males vibrate their thoracic muscle less and also had a different odor composition than the un-exposed males. The decline in bee populations in agricultural landscapes could therefore be explained by the effect of pesticides on insect mating behavior."



According to the researchers, this study is the first to demonstrate that a fungicide with low toxicity disrupts the reproduction of bees in the mating phase.&nbsp;



"Our study shows that the early stages of bee reproduction must be included in the risk assessment of pesticides," said study co-author Professor Thomas Schmitt.



Boff hopes for broader testing of different pesticides on bee behavior and their chemical signals so that bees can be more effectively protected.



"The results provide evidence that can help to understand how pesticides might lead to reduced bee populations world-wide, especially in crop sites," wrote the researchers. "Our study on mating behavior and sexual signals sheds the light on a new path to explore the impact of environmental stressors on insect decline."&nbsp;



"Due to the importance of bees for pollination service provision, we stress the need for the inclusion of mating experiments on safety test programs of chemical products used in agriculture, to understand the effect of pesticides on the reproductive system of beneficial insects such as bees."



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



---



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

Pesticides make it harder for male bees to attract mates

Around the world, bees are facing many threats, including toxic...

A new study led by <a href="http://eng.hubu.edu.cn/">Hubei University</a> has found that, after males of the orb-weaving <a href="https://www.earth.com/news/scientists-explain-spiders-complex-mating-choreography/">spider</a> Philoponella prominens mate with a female, they use a joint in their first pair of legs to quickly undertake a split-second catapult. The spiders launch themselves away from their sexual partners at high speeds reaching up to 88 centimeters per second. According to the experts, they do this in order to avoid being eaten by the female in an act of sexual cannibalism.



“We found that mating was always ended by a catapulting, which is so fast that common cameras could not record the details clearly,” said study lead author Shichang Zhang, an associate professor of Life Sciences at Hubei University.



Professor Zhang and his colleagues made this fascinating discovery while studying sexual selection in this species of spiders, who live in rather large groups of up to 300 individuals. Of the 255 successful couplings that the scientists observed, 152 ended with male catapulting, which all managed to survive their sexual encounters. The other three males were killed and eaten by the females.



Using high-resolution cameras, the researchers calculated an average peak-speed of catapulting spiders of approximately 65 cm/s, and an acceleration of about 200 m/s2.&nbsp; While soaring through the air, the males spin around 175 times per second. In order to perform such impressive feats, the spiders initially fold their tibia-metatarsus joint against the female. At the moment they release it, hydraulic pressure allows for extremely rapid expansion.



“We observed that males that could not perform the catapulting were cannibalized by the female. It suggests that this behavior evolved to fight against female’s sexual cannibalism under strong predation pressure of females,” Professor Zhang explained.



“Females may use this behavior to judge the quality of a male during mating,” he added. “If a male could not perform catapulting, then kill it, and if a male could perform it multiple times, then accept its sperm.”



In future research, the scientists aim to explore the role that the catapulting abilities of male spiders may play to ensure mating success.



The study is published in the journal <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(22)00485-7">Current Biology</a>.



---



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

Male spiders catapult away from sex partners to avoid being eaten

A new study led by Hubei University has found that,...

Bacteria in the ocean are incredibly numerous and play important roles in the marine ecosystem, some of which we may not yet understand. Despite their plentitude, there are many gaps in our knowledge of <a href="https://www.earth.com/news/earth-day-is-the-perfect-time-to-support-the-ocean-decade/">ocean</a> microbes. New research sought to investigate one of the most basic aspects of the lives of marine bacteria - do they actively hunt or merely drift through the water consuming whatever they encounter? The science suggests the former.&nbsp;



An international group of scientists led by researchers at the <a href="https://www.uts.edu.au/">University of Technology Sydney</a> (UTS) used microchips to peer into the world of microbes. What they discovered is that bacteria move in ways comparable to larger animals when foraging.&nbsp;



“We had some idea that microbes could swim around their immediate environment to find and exploit food patches, but the only available evidence came from laboratory experiments, which are often not very realistic or representative of natural environments," said study lead author and microbial ecologist Dr. Jean-Baptiste Raina.



"This kind of behavior had never been comprehensively examined in the environment among natural populations of microbes. Now, for the first time, we’ve been able to show that the swimming behaviour of microbes in the natural environment is governed by the attraction of bacteria to specific chemical cues, which dictates important processes and interactions that structure the base of the marine food web.”



The scientists created bacteria traps in order to investigate the microbes feeding preferences and found that certain chemicals that the bacteria consume create “feeding frenzies.” The scientists say that the behaviors and preferences of bacteria can have important implications.&nbsp;



“When we think about how small a bacterium is, it is easy to dismiss the consequences of its behavior," explained study senior author Professor Justin Seymor.



"However, because marine bacteria are so numerous and diverse, the way they find, consume and recycle chemicals in seawater can have a profound influence on processes that control global climate and the productivity of the marine food web."



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



---



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

Marine bacteria hunt with purpose

Bacteria in the ocean are incredibly numerous and play important...

In a new study from <a href="https://www.uu.nl/en">Utrecht University</a>, scientists have investigated the mental well-being of shelter dogs by examining stress hormones.&nbsp;



"Dogs can suffer from chronic stress in environments that are sub-optimal to their needs, such as in many kennel environments," wrote the study authors.&nbsp;



"Chronic stress may exceed the animals’ adaptive capacity and thus, threaten its welfare state. Chronic stress may even elicit medical and behavioral problems in the long term. Therefore, to improve canine welfare, reliable and feasible non-invasive indicators of long-term stress levels need to be evaluated."



It comes as no surprise that shelter dogs are stressed. They are exposed to lots of other dogs, strange humans and are more isolated from the outside world.



"We know that a shelter is not a stress-free environment for dogs, even though staff members do their best to achieve the highest possible welfare," said lead researcher Janneke Van der Laan. "Even if you organize a shelter in the best possible way, there are still stress factors, such as crowds of other dogs and not being able to go outside as often as usual. And most important: the dog is gone from their old, familiar environment.”



The scientists carried out the research by measuring levels of cortisol, a stress hormone that is found in humans as well as dogs. The cortisol levels can be measured from hair samples, so the research team collected hair from dogs at the beginning of their stay at a shelter, throughout the course of their stay, and after they were adopted out.  



"In addition to the cortisol measurements in hair, we also measured cortisol values in the dogs’ urine. This gives a short-term picture while the hair measurements show the long term," explained van der Laan.



"We took daily measurements in the shelter for over a year. After adoption, the new owners - after clear instructions - cut the dogs hair and sent it to us. They were helpful and enthusiastic, and were very interested in what their dog had experienced before adoption.”



The dogs' cortisol levels started at the same levels of other domestic dogs but rose during their time at the shelter, peaking after six weeks. Fortunately, these stress levels fell at about the same rate when dogs found new homes and ultimately returned to normal. One surprising (and so far unexplained) result was that smaller dogs exhibited higher cortisol levels than their larger counterparts.&nbsp;



The study shows that even a shelter like the one used, which does its best to improve welfare for animals, is a stressful place for dogs. The research highlights the need to get dogs adopted as soon as possible to good homes.&nbsp;



The study is published in the journal <a href="https://www.nature.com/srep/">Scientific Reports</a>.&nbsp;&nbsp;



---



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

Shelter dogs have high levels of stress

In a new study from Utrecht University, scientists have investigated...

A team of researchers from the <a href="https://www.exeter.ac.uk/">University of Exeter</a> in UK and Stellenbosch University in South Africa has recorded sounds made by <a href="https://www.earth.com/news/humpback-whales-travel-thousands-of-miles-to-mate/">humpback whales</a> at the Vema Seamount in the Atlantic Ocean, a few hundreds of miles west of the South African coast. The recordings revealed a variety of calls, including an “impulsive sound” – dubbed “gunshot” by the scientists – that has never been recorded before.



The researchers used moored hydrophones deployed during the Southern Hemisphere spring of 2019 to record the whales’ calls. These calls were detected during a period of 11 days, and were categorized into continuous “song” and shorter “non-song” calls. 



Among the over 600 non-song calls recorded, the most common one was a low “whup,” which is known to be used between mothers and calves to help them locate each other. Occasionally though, whales also “whup” while feeding. Other sounds included “grumble” calls – which are also emitted by whales while feeding – as well as a more mysterious “gunshot” call, whose significance is still unknown.



“We still don’t fully understand what the “gunshot” call means, and it is fantastic to record it in humpback whales for the first time,” said&nbsp;study co-author Dr. Kirsten Thompson, a population biologist at the University of Exeter. “It really shows how much we still have to learn about these incredible animals.”



According to Dr. Thompson, the “whup” and “grumble” calls confirm that the whales passing through&nbsp;the Vema Seamount during their long migration to the polar regions are feeding. “Seamounts can provide rich habitat for all sorts of migratory species and we urgently need widespread protection of the global oceans to ensure these habitats can persist.”



Although the area around the Vema Seamount was heavily overfished after its discovery in 1959, it is now closed for fishing and recognized as a vulnerable marine ecosystem in need of protection due to its unique biodiversity. However, no legally binding international agreement exists to protect the network of seamounts in the high seas.



“50 years ago, governments came together to turn around the fate of humpback whales. Now they have a chance to secure the progress already made and protect the high-seas habitats that whales rely on. While such large areas of our oceans remain unprotected, these ecosystems are highly vulnerable. A coherent and connected network of Marine Protected Areas (MPAs) across our oceans is urgently needed to ensure seamounts like Vema are protected,” concluded Dr. Thompson.



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

Humpback whale calls reveal mysterious gunshot sound

A team of researchers from the University of Exeter in...

In Steven Spielberg’s iconic film Indiana Jones and the Kingdom of the Crystal Skull (2008), the lead character – played by Harrison Ford – warns of the dangers of small scorpions, claiming that “when it comes to scorpions, the bigger the better.” Now, a research team led by the <a href="https://www.nuigalway.ie">National University of Ireland, Galway</a> (NUI Galway) has confirmed Indiana Jones’ insights. By analyzing 36 species of scorpion, the scientists found that smaller species with smaller pincers have more potent venom compared to larger species with robust claws.



“When we look at the most potent, and dangerous, scorpion venoms we find they tend to be associated with species such as the deathstalker which are relatively small. In contrast, the biggest species such as rock scorpions have venoms that are likely to only cause slight pain,” said study senior author Kevin Healy, a lecturer of Zoology at NUI Galway. “Outside of entertaining movie trivia there are good evolutionary reason to expect the results and important medical implications for such patterns.”&nbsp;



Dr. Healy and his colleagues argued that, although scorpions use both their venomous sting and their pincers to capture prey and defend themselves, there is an evolutionary trade-off between these weapons. Energy used to make and maintain larger pincers means less energy is available for the scorpion’s chemical arsenal. Thus, larger scorpions that can use their physical size are less reliant on venom, while smaller ones have evolved more potent, deadly venoms.



“Not only did we find that bigger is better - when it comes to people being stung - we also found that bigger pincers are better when it comes to assessing the danger level of a scorpion. While species such as large-clawed scorpion might be small to medium in size, they mainly rely on their large pincers instead of their relatively weak venom,” explained study lead author Alannah Forde, a graduate student in Zoology at NUI Galway.



Since scorpion stings are a global health problem with over one million cases and thousands of deaths each year, identifying the attacking species is vital for treatment.&nbsp;



“As scientists, our job is also to put popular wisdom to the test. Most victims hospitalized with severe symptoms following scorpion stings are children below the age of 15. Identifying the species responsible is essential to administer the correct treatment, and a simple rule such as ‘bigger is better’ is a first small step toward saving lives,” concluded another senior author, Dr Michel Dugon, Head of the <a href="https://www.nuigalway.ie/zoology/research/venom/">Venom System Lab</a> at NUI Galway.&nbsp;



The study is published in the journal <a href="https://www.mdpi.com/2072-6651/14/3/219">Toxins</a>.&nbsp;



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

Indiana Jones was right, small scorpions are more deadly

In Steven Spielberg’s iconic film Indiana Jones and the Kingdom...

Colorful tropical <a href="https://www.earth.com/news/climate-change-has-destroyed-14-percent-of-the-worlds-coral-reefs/">coral reefs</a> are teeming with an amazing diversity of marine organisms, including over 8,000 species of fish. However, climate change and various human activities are causing these reefs to disappear at an alarming rate, making scientists largely unable to properly quantify how many species of reef fish there are and where they are distributed.&nbsp;



Besides the rapid pace of change that coral reefs are facing worldwide, there are several other reasons why scientists have difficulties in mapping marine ecosystems from specific areas. Most of these fishes lead rather secretive, hidden lives, are highly similar to one another, or live in the open sea and are thus difficult to detect.



In order to circumvent such difficulties, a research team from <a href="https://ethz.ch/en.html">ETH Zurich</a> has applied a new method that is currently advancing the field of ecology - environmental DNA (eDNA) analysis. The idea behind this new approach is that organisms leave their genetic material or parts of it in the environment.&nbsp;



By using this method, the scientists only need to take water samples at one location, isolate the DNA fragments they contain, sequence them, and compare these sequences with reference DNA sequences coming from reliably identified specimens in order to determine whether a particular species occurs at the location in question.



“Thanks to the eDNA method, we can detect many fish species and families much faster than with observations alone,” said study senior author Loïc Pellissier, a professor of Ecosystems and Landscape Evolution at ETH Zurich.



In 2017 and 2019, Professor Pellissier and his team collected 226 water samples at 26 sites in five tropical marine regions. The eDNA analysis of these samples revealed a 16 percent higher diversity of reef fishes than what conventional survey methods such as visual observations during dives have previous managed to detect.&nbsp;



With the eDNA method, the scientists discovered more pelagic (swimming in open water), reef-bound, and cryptobenthic (inhabiting caves and crevices in reefs) species than divers are generally able to see or identify. The discovery of these species is highly important because they are actively involved in the function of the coral reefs through their pelagic larval stages or their nocturnal migrations to the reefs.



The findings suggest that the composition of species varies significantly among marine bioregions. Fish diversity was found to be exceptionally high in the “Coral Triangle” between Borneo, Papua New Guinea, and the Philippines (five times higher than in the Caribbean, for instance).&nbsp;



According to Professor Pellissier, this has to do with the fact that, historically, the Coral Triangle was very tectonically active, producing a wide range of habitats. Moreover, the more stable surface temperatures of this area during the ice ages allowed the fishes to diversify considerably.



Although this new method is extremely efficient for mapping reef biodiversity, it has its limitations. Since some species – such as wrasses (Labridae) or blennies (Blenniidae) - are poorly detected through eDNA analysis, direct visual observations remain important. In addition, these more traditional methods can help gather supplementary information, such as fish sizes or biomass, which cannot yet be recovered through eDNA analysis.



The study is published in the journal <a href="https://royalsocietypublishing.org/doi/10.1098/rspb.2022.0162">Proceedings of the Royal Society B: Biological Sciences</a>.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;



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

Experts use eDNA to measure reef fish diversity

Colorful tropical coral reefs are teeming with an amazing diversity...

In celebration of Earth Day today, <a href="https://nature.disney.com/">Disneynature</a> will be releasing an all-new documentary film, “Polar Bear,” which will be available to view on the Disney+ streaming service as part of an Earth Day celebration. The feature, filmed over three years in and around Svalbard, gives a glimpse into the life of a mother polar bear as she navigates the challenges of life for her young family. The story follows the mother bear’s memories of her youth and how these prepare her to face the changes occurring in the <a href="https://www.earth.com/news/brown-carbon-released-from-wildfires-is-warming-the-arctic/">Arctic</a> world due to global warming.&nbsp;



The filmmakers had to overcome enormous challenges in order to film this documentary. Svalbad, a Norwegian archipelago between Norway and the North Pole, is a place of glaciers, frozen tundra, mountains and fjords. Some filming had to take place during the icy winter and early spring when the seas are frozen over and the polar bears begin to hunt. At times, the filmmakers had to work in bitterly cold conditions and total darkness. Add to this the fact that the iconic stars of the show are white against a white background and wander around at will, and the amazing feat of the filmmakers becomes even more impressive.&nbsp;



The directors, Alastair Fothergill and Jeff Wilson, admit that they would not have been able to make this film ten years ago, but advances in technology – including drones – allowed them and members of their team to get closer than ever to the bears. Apart from using drones to film at a distance, the use of long lenses allowed the filmmakers to witness but not to disturb the natural behavior of the polar bears.



The result is a remarkable and awe-inspiring portrait of polar bears and the habitat in which they live. The visual feast is provided by the polar bears themselves, when they exhibit playful, resilient and tender behavior. The film’s musical score, composed by Harry Gregson-Williams, sensitively conveys these varied emotions using specific themes for each storyline. The narrator, two-time Academy Award nominee Catherine Keener, uses spare narration and measured intonations to characterize the mother bear as “thoughtful, courageous, and resilient.”&nbsp;



Film sequences of the Arctic habitat are more sobering, however. They show the deteriorating state of the polar ice and relate this state of affairs to the bears’ decreased chances of survival. As the ice melts, they have to make more dangerous journeys and travel further to find the food they need. In this way, the documentary highlights the plight of this remarkable species in a world beset by climate change.&nbsp;



In keeping with the Disney philosophy to care for wildlife and their habitats, the Disney Conservation Fund has committed to providing support to Polar Bears International to help their efforts to protect polar bears and their sea ice habitat.



“Polar Bears International is an exceptional organization doing exceptional work for both the polar bears and the environment in which they live,” said Roy Conli, who is a producer of “Polar Bear.” “They bring essential awareness to the general populace of what’s going on in the Arctic, the realities polar bears face today, and hope for how we can all take action to positively change the future for this species. I’m so proud that we’re working with their incredible team.”&nbsp;



“The reason we wanted to make the film is people talk a lot about climate change but it's hard to show it. In this film, through the eyes of our female bear, you certainly see it," said film director Alastair Fothergill. "And I think Earth Day is a very good time to question. You should question your own footprint on the planet, your own use of energy, as individuals we can do an enormous amount.”



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

Disney documents the plight of polar bears in remarkable film

In celebration of Earth Day today, Disneynature will be releasing...

Dirty fossil fuels, burned to create electricity or just to transport us across town, get a lot of headlines. But there are other sources of destructive greenhouse gases, such as animal agriculture. Not only that, but animal agriculture contributes to habitat destruction, competition with wild animals, and cruelty to domestic animals.&nbsp;



Animal agriculture is also a major contributing factor to climate change. In fact, <a href="https://assets.ciwf.org/media/7447656/breaking-the-taboo-why-diets-must-change-to-tackle-climate-emergency.pdf?_gl=1*1ykctxr*_ga*MTIwNDU0MDAxNi4xNjMyMjM5MzYw*_ga_QHTMX95D1M*MTYzODIyMTUzNi42NC4wLjE2MzgyMjE1NDMuMA..">a study</a> by <a href="https://www.ciwf.org/">Compassion in World Farming </a>shows that meeting the Paris 1.5 °C target is impossible without tackling the issue. The food industry contributes somewhere between a quarter and a third of greenhouse gases. The livestock industry is responsible for 75 percent of agriculture’s greenhouse gas emissions, or 14.5 percent of global greenhouse gas emissions as a whole.&nbsp;



Animal agriculture contributes to deforestation, including the destruction of the Amazon Rainforest in South America. Not only is land cleared for the animals raised for food, but more land is cleared to grow food for those animals in a parody of inefficiency. Besides ruining the beauty of forests and other habitats and killing wildlife, habitat destruction also releases carbon stores, contributing even more to climate change. Soils and water are polluted with excess animal waste directly from livestock as well as pesticides, herbicides and fertilizer for animal feed.&nbsp;&nbsp;



Furthermore, livestock contribute to greenhouse gases and pollution, and animal agriculture is decidedly bad for wildlife as well. Cattlemen’s associations in the US have been all too willing to promote<a href="https://www.biologicaldiversity.org/news/press_releases/2012/wolves-01-31-2012.html"> killing wolves</a> and other predators as well as <a href="https://biologicaldiversity.org/w/news/press-releases/appeals-court-upholds-habitat-protections-for-new-mexico-meadow-jumping-mouse-2022-04-18/">challenge habitat protections</a> for <a href="http://www.oklahomafarmreport.com/wire/news/2021/09/02794_CattleGroupsChallengeESAListing_LPC09032021_162343.php#.YmLjjy1OKhA">endangered species</a>. There are a finite amount of resources on the planet and when they’re all used to feed livestock, there’s less for other animals to survive on.&nbsp;&nbsp;&nbsp;&nbsp;



The good news is that it’s within your power to contribute to a solution. By cutting out or cutting down on animal products - meat (including fish), dairy and eggs - you can help. You can also help by supporting government programs aimed at reducing meat consumption. Today, fees for grazing on public lands are at their <a href="https://www.hcn.org/issues/54.5/north-bureau-of-land-management-cows-coal-and-climate-change-a-q-a-with-the-new-blm-director">lowest legal limit</a> and much of it is <a href="https://www.hcn.org/articles/north-bureau-of-land-management-there-are-millions-of-acres-of-failing-rangelands-data-shows">overgrazed</a>.&nbsp;



“Reducing meat, egg, and dairy consumption is one of the easiest and strongest levers we can use to combat climate change, pollution, and animal abuse," said Ben Williamson, the US Executive Director of Compassion in World Farming.



If you care about the climate, wildlife, public lands, basically anything Earth Day stands for, now is the time to think hard about what’s on your plate, because dinner could be the change we need.&nbsp;



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

Eat for a healthy planet - reduce the demand for animal agriculture

Dirty fossil fuels, burned to create electricity or just to...

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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

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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

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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

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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

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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



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 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

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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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