Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features an astronaut view of the Tunupa Volcano, a dormant volcano in southwestern Bolivia. The volcano is located on a peninsula between two of Bolivia’s largest salt flats - Salar de Uyuni and Salar de Coipasa.



"Tunupa Volcano is located at the center of the Southern Altiplano, or the Andean Plateau, and rises as high as 5.3 kilometers (3.3 miles) in elevation," says NASA. "The volcano is a composite cone - a large, complex volcano that is often covered by lava flows, pyroclastic and mudflow deposits, and domes. Last active about 1.4 million years ago, Tunupa is now considered dormant."



"The flanks of the volcano’s cone are incised by valleys that were eroded by ancient glaciers and stream flows. Domes and lava flows appear on the eastern side of Tunupa, and the volcano is adjacent to other eroded volcanic fields and craters, including Jayu Khota and Titivilla."



According to NASA. the salt flats are typically a bright white color when viewed from orbit - but during Bolivia’s rainy season, rivers can carry sediment rich in microbes and dark-colored volcanic minerals onto the flats.&nbsp;



The image was captured on February 5, 2022 by a member of the Expedition 66 crew.



Image Credit: NASA Earth Observatory



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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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Tunupa Volcano in southwestern Bolivia

Today's Image of the Day from NASA Earth Observatory features...

Today's Image of the Day from the <a href="https://www.esa.int/ESA_Multimedia/Images/2023/09/Earth_from_Space_Southern_Patagonian_Ice_Field">European Space Agency</a> features the Southern Patagonian Ice Field in the Southern Andes. It is one of the world's largest continuous masses of ice outside the polar regions.&nbsp;



The Southern Patagonian Ice Field spreads across the border between Argentina and Chile and is an essential fresh water reservoir. Covering an area of about 12,363 square kilometers, it is home to numerous glaciers, including the well-known Perito Moreno and Upsala Glaciers in Argentina.



The ice field is situated within the Andes mountain range and is part of two national parks: the Los Glaciares National Park in Argentina and the Torres del Paine National Park in Chile.&nbsp;



"Ice fields form as a result of accumulations of snow that turn into ice through years of compression and freezing. Shaped by the underlying topography, glaciers often form at the edges of an ice field," explained ESA.



"In this image, the ice mass feeds several smaller and bigger glaciers, including the Argentinian Perito Moreno Glacier in the top right corner. Located on a narrow channel, Perito Moreno feeds Lake Argentino and forms an ice dam that separates the main body of the lake, visible on top in turquoise, from its southern arm, which appears grey."



The Southern Patagonian Ice Field is crucial for the study of climate change as it reacts sensitively to temperature variations. Over recent years, it has experienced significant retreat and thinning due to global warming, leading to concerns over rising sea levels and loss of freshwater resources.&nbsp;



"Glaciers are the largest reservoirs of freshwater on our planet. The rate at which they may be melting or growing is one of the best indicators of climate change," said ESA. "The demise of glaciers is one of the main causes of sea-level rise. Many glaciers in Patagonia have retreated over the last 50 years."&nbsp;



Image Credit: ESA&nbsp;



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The Southern Patagonian Ice Field in the Andes Mountains

Today's Image of the Day from the European Space Agency...

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA Earth Observatory </a>&nbsp;features a dust storm that moved across parts of Iran, Afghanistan, and Pakistan in mid-September.



"This image, acquired by the VIIRS (Visible Infrared Imaging Radiometer Suite) instrument on the NOAA-NASA Suomi NPP satellite, shows thick plumes of dust blowing hundreds of kilometers across the arid region on September 22, 2023," said NASA.



"The dust appears to emanate from the ephemeral Hamun wetlands, which partially surround the Iranian city of Zabol. When dry, this area becomes a hotspot for dust storms due to a persistent weather feature known as the Levar wind (or “120-day wind”), which blows out of the northwest from late-May to late-September."



Across the Sistan-Baluchistan province in southeastern Iran, three people were killed in accidents related to poor visibility and more than 1,300 others sought medical assistance for respiratory, heart, and eye ailments.



According to NASA, more than two decades of low water levels in the Hamun wetlands have led to a significant increase in dust storms. This has been especially the case during the 120-day winds, strong summer winds that occur from late May to late September.



"Water levels are influenced by rainfall and the flow of the Helmand river, which runs from the Hindu Kush mountains across Afghanistan before terminating at the wetlands. More frequent drought since 1999, along with increasing upstream demands on water resources for agriculture and other uses, have amplified the drying," said NASA.



Image Credit: NASA Earth Observatory&nbsp;



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Brutal dust storm sweeps across Southern Asia

Today's Image of the Day from NASA Earth Observatory &nbsp;features...

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features dust flowing through the Tokar Gap, where the easternmost extent of the African Sahel meets the Red Sea.



"Mountain chains border both sides of the Red Sea, the long narrow inlet of the Indian Ocean that separates Saudi Arabia to the east from Egypt, Sudan, and Eritrea to the west. One major exception is the Tokar Gap, a 100-kilometer (60-mile) break in the Red Sea Hills that serves as a conduit for both winds and dust," says NASA.



"In the summer, strong surface winds frequently stream through the gap from the southwest, often funneling narrow plumes of dust from the Tokar Delta over the Red Sea."



The photo was captured on June 24, 2023 by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite. The image shows a plume of dust from Sudan pushing through the Tokar Gap.



"In the winter, the winds reverse and winds typically gather over the Red Sea and move through the gap toward the southwest," says NASA.



"A 2019 analysis of weather conditions that fuel summer dust storms indicated that stronger winds moving through the Tokar Gap - and warmer air and soil temperatures - have increased the amount of airborne dust found in this area since 2002."



Image Credit: NASA Earth Observatory/ Wanmei Liang



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Dust from Africa streams through the Tokar Gap

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory </a>&nbsp;features a fjord in western Greenland as the ice was joined by a mysterious arc.



"In summer, the fjords around Greenland are commonly littered with angular pieces of ice that have sloughed off from the island’s numerous outlet glaciers. But on August 3, 2023, the ice on a fjord in western Greenland was joined by a peculiar arc," said NASA.



"The thin, white feature spans much of Itilliarsuup Kangerlua, a tributary fjord of the Uummannaq Fjord system in Western Greenland. It extends about 2.6 kilometers (1.6 miles) from the front of Kangilleq glacier."



While the origin of the arc remains unclear, experts have proposed some possible theories. Dan Shugar, a geomorphologist at the University of Calgary, suggests that the arc may be the result of a large iceberg that broke off from the front of the glacier.



"An iceberg breaking from the glacier - above or below the water’s surface - would displace water, creating a wave," explained NASA.



"Josh Willis, an oceanographer at NASA’s Jet Propulsion Laboratory, and Mike Wood, a glaciologist at Moss Landing Marine Laboratories, agree that a newly formed iceberg is a likely explanation."



The scientists also pointed to a different phenomenon that is known to displace water in the fjords around Greenland. According to Willis, there could be water pushing ice away from the glacier face caused by an underwater plume.



The image was captured by the Operational Land Imager-2 (OLI-2) on Landsat 9.&nbsp;



Image Credit: NASA Earth Observatory&nbsp;



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Mysterious arc joins ice on a fjord in western Greenland

Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features the Sahara Desert on the afternoon of May 3, 2023, as the International Space Station passed above. An astronaut captured this striking image of hills and sand dunes in southern Mauritania.&nbsp;



"A line of dark, flat-topped hills known as mesas dominate the view," said NASA. "The small town of Guérou is a faint gray patch on the banks of a small stream. The faint line of a road can be seen cutting through the landscape and connecting with Guérou."



"The mesas are remnants of a large Paleozoic Era sandstone formation. They rise steeply 300 to 400 meters (1,000 to 1,300 feet) above the surrounding plain."&nbsp;



"Rocky surfaces in deserts often appear dark-toned as a result of a thin layer of black rock varnish that develops on rock surfaces enriched in manganese."



Southern Mauritania is part of the vast Sahelian region, which serves as a transitional zone between the Sahara Desert to the north and the more fertile savannahs of West Africa to the south.&nbsp;



The southern part of Mauritania is generally flatter and has a semi-arid climate. It receives more rainfall than the northern regions, but it's still quite sparse. The Senegal River, which forms the border between Mauritania and Senegal, is one of the major rivers in West Africa and is crucial for agriculture in this region.



The area around the Senegal River is the most agriculturally productive part of Mauritania. Rice, millet, and other grains are commonly cultivated. Fishing in the Senegal River is also a significant activity. Despite these resources, southern Mauritania remains relatively poor and underdeveloped.



The region is home to a mix of ethnic groups, including the Moors (both Arab-Berber Moors and Black Moors or Haratin) and various black African ethnic groups such as the Wolof, Pular (or Fulani), and Soninke.



Southern Mauritania faces a variety of challenges. Periodic droughts can devastate local agriculture. There are also socio-economic issues, including poverty, lack of infrastructure, and limited access to education and healthcare.



The Diawling National Park, located in the southwest corner of Mauritania near the Senegal River, is one of the country's premier protected areas. The park is known for its birdlife and serves as an important wetland habitat.



Image Credit: NASA Earth Observatory&nbsp;



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Hills and sand dunes of southern Mauritania

Native to Australia, the gouldian finch has distinctive green, yellow, red, and black markings. The males have a bright purple chest, while the female’s chest is a lighter shade of mauve.

Gouldian Finch

Red,Aurora,(northern,Lights),Over,Mono,Lake,In,A,Rare

This week, the world bore witness to a spectacular celestial display of red auroras, as a powerful solar storm collided with Earth’s magnetic field, painting the night sky with vibrant hues of red. 



Skywatchers from Europe to North America were treated to this stunning light show, particularly those in regions with clear skies. Some observers described the display as the '<a href="https://www.earth.com/wp-content/uploads/2023/09/aurora-borealis_red_green_1medium.jpg" target="_blank" rel="noreferrer noopener">Holy Grail of Northern Lights</a>', given the rarity of witnessing red auroras, especially as far south as France and Kansas.



<h2 class="wp-block-heading" id="h-collision-of-natural-forces">Collision of natural forces</h2>



Solar storms result from the expulsion of charged particles from the Sun, known as <a href="https://www.earth.com/news/the-solar-wind-which-creates-beautiful-auroras-on-earth-is-now-less-mysterious/" target="_blank" rel="noreferrer noopener">solar winds</a>. These winds interact with Earth's magnetosphere, and our planet’s <a href="https://www.earth.com/earthpedia-articles/earths-magnetic-field-origin-structure-and-impact-on-humanity/" target="_blank" rel="noreferrer noopener">magnetic field</a> captures and directs these particles toward high-latitude regions near the magnetic poles. 



The collisions between these charged particles and atoms and molecules in Earth’s atmosphere, like oxygen and nitrogen, energize them. This results in beautiful light shows in various colors, creating the mesmerizing phenomenon known as <a href="https://spaceplace.nasa.gov/aurora/en/" target="_blank" rel="noreferrer noopener">auroras</a>.



<h2 class="wp-block-heading" id="h-the-palette-of-the-skies">The palette of the skies</h2>



Different gases and altitudes result in the emission of different colors. Oxygen at higher altitudes emits red light, while at lower altitudes it produces green light. Nitrogen, on the other hand, can produce purples, blues, and pinks. 



Green is the <a href="https://www.earth.com/earthpedia-articles/catch-the-aurora-borealis-in-iceland/" target="_blank" rel="noreferrer noopener">most prevalent aurora color</a> due to the optimal conditions and altitudes for producing the green wavelength. This often creates a breathtaking spectacle as the lights ripple, dance, and shimmer across the night sky. However, during strong auroral displays, red, purple, and blue may also appear, adding to the splendor of the visual feast.



<h2 class="wp-block-heading" id="h-red-auroras-a-scarlet-spectacle">Red auroras -- A scarlet spectacle</h2>



Red auroras are particularly enchanting, resulting from high-energy electrons colliding with oxygen atoms at altitudes above 200 miles. The longer wavelength of red light allows it to travel farther distances and often appear at the lower edges of an aurora. 



The red hue isn’t as common as green, occurring less frequently due to its reliance on collisions at higher altitudes. During active displays, the red dances above the green, creating an unparalleled natural light show.



<h2 class="wp-block-heading" id="h-unexpected-impact">Unexpected impact</h2>



Although experts had predicted a solar storm for September 24, the strength of the impact surpassed expectations. The flare from the Sun triggered a potent geomagnetic storm above Europe, illuminating the skies of Scotland, Iceland, and the Netherlands with bright green and red auroras. It later traveled across the Atlantic Ocean to North America, extending as far south as Kansas and Nebraska.



<h2 class="wp-block-heading" id="h-a-year-of-celestial-wonders">A year of celestial wonders</h2>



For aurora chasers, this year has been notably thrilling, with several astonishing displays of northern lights reaching unusually far south. The last red aurora observed was in February, and the frequency of such events is attributed to a surprisingly active <a href="https://spaceplace.nasa.gov/solar-cycles/en/" target="_blank" rel="noreferrer noopener">solar cycle</a>. 



Some eruptions were so powerful that they triggered radio blackouts in the US in June. As we are heading toward the peak of an approximately 11-year cycle of solar activity, more spectacular displays might be on the horizon.



Experts at <a href="https://earthsky.org/" target="_blank" rel="noreferrer noopener">EarthSky</a> noted on September 26, “Sun activity is back to low, but we saw filament eruptions all over the solar disk, particularly in the northeast and northwest. These filaments hurled ejecta into space, and we await the results of specialist analysis to determine if a component of those blasts is coming our way.”



<h2 class="wp-block-heading" id="h-more-red-auroras-expected">More red auroras expected</h2>



Aurora enthusiasts are indeed in eager anticipation for more of these celestial ballets in the sky, a vivid reminder of the dynamic and ever-changing nature of our universe. This extraordinary display of red auroras, historically perceived by some as ominous harbingers of war or tragedy, today unites people in wonder, illuminating the skies with its rare and ethereal beauty.



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Dazzling red auroras, the "Holy grail of northern lights," ignited the skies this week

This week, the world bore witness to a spectacular celestial...

During a recent deep-sea dive off the coast of Hawaii, scientists encountered a rare and mesmerizing ocean creature known as the “Dumbo octopus."&nbsp;



This remarkable sighting occurred approximately a mile below the ocean's surface, on an unnamed seamount located within the <a href="https://www.papahanaumokuakea.gov/" target="_blank" rel="noreferrer noopener">Papahānaumokuākea</a> Marine National Monument.



The expedition was funded by the <a href="https://nautiluslive.org/video/2023/09/27/cute-dumbo-octopus-eyes-rov-hercules">National Oceanic and Atmospheric Association</a> (NOAA).&nbsp;



<h2 class="wp-block-heading" id="h-dumbo-octopus">Dumbo octopus</h2>



The Dumbo octopus, also known as Grimpoteuthis, belongs to the umbrella <a href="https://www.earth.com/news/octopus-and-squid-senses-linked-to-human-brain-evolution/">octopus</a> family. The nickname "Dumbo" comes from its resemblance to the character in Disney's 1941 film, due to the prominent ear-like fins situated on top of its head. The octopus utilizes these fins to gracefully propel itself through the water, as it searches for food.



The Dumbo <a href="https://www.earth.com/news/secret-garden-thermal-springs-accelerate-octopus-egg-hatching-by-years/" target="_blank" rel="noreferrer noopener">octopus</a> is usually found in the deep waters of the central Pacific at depths ranging from 1,300 to 13,000 feet. However, some of these intriguing animals have been found as deep as 23,000 feet.&nbsp;



Because they live in such deep, dark environments, their coloration can vary, often appearing in shades of red, pink, brown, or white.



<h2 class="wp-block-heading" id="h-fascinating-footage-nbsp">Fascinating footage&nbsp;</h2>



The footage of the Dumbo octopus was captured by the Exploration Vessel (E/V) Nautilus, providing a unique opportunity to observe the creature as it effortlessly drifts in the ocean's depths.&nbsp;



<div class="wp-block-sendtonews-playerselector">[sendtonews key="9KGzHmAd5J-3029266-12187" type="single"]</div>



The crew aboard the E/V Nautilus was fortunate enough to witness not just one, but five of these creatures in a single night.



<h2 class="wp-block-heading" id="h-a-beautiful-experience">A beautiful experience</h2>



Jaina Galves, a video engineer intern who played a role in this discovery, shared her excitement about the experience.



“Each time, you’re kind of just roaming around with the ROV,” said Galves. “Somebody’s like, wait, what is that in the corner, and then everybody starts to gasp, everybody starts to freak out. And everybody’s like Dumbo octopus!"



"So we take the ROV over, we go, and we follow them. They move very slowly and very gracefully, so we get to follow them for quite a while.”



“It depends on what we’re doing and how long we can hang out. But for one of them, we just got to stay for quite a while. Just watched it kind of glide through the water, and it was beautiful.”



Galves told ABC News: “When I saw it on the screen, I couldn’t even say anything. My jaw was just on the floor.”



<h2 class="wp-block-heading" id="h-unique-characteristics">Unique characteristics</h2>



<h3 class="wp-block-heading" id="h-size">Size</h3>



Overall, scientists have discovered more than a dozen species of dumbo octopuses. The largest individual captured on film was nearly six feet long, according to the environmental group Oceana, but most are much smaller, with an average length of 8 to 12 inches.&nbsp;



<h3 class="wp-block-heading" id="h-appearance">Appearance</h3>



Dumbo octopuses are characterized by their unique umbrella-shaped appearance when their arms are spread. They possess a soft, gelatinous body, which is an adaptation to the deep-sea environment.



<h3 class="wp-block-heading" id="h-diet">Diet</h3>



The <a href="https://www.earth.com/earthpedia-articles/are-octopuses-smart/" target="_blank" rel="noreferrer noopener">octopuses</a> feed on crustaceans, benthic worms, and other small organisms found on the ocean floor. They often swallow their prey whole.



<h3 class="wp-block-heading" id="h-reproduction-nbsp">Reproduction&nbsp;</h3>



Unlike many other octopus species, Dumbo <a href="https://www.earth.com/news/do-octopuses-dream-a-recent-study-shows-octopuses-sleep-is-very-similar-to-humans/" target="_blank" rel="noreferrer noopener">octopuses</a> do not have a defined breeding season. They can lay eggs at any time, and the young are developed enough to survive on their own immediately after hatching. While their exact lifespan is unknown, it is believed to be about 3 to 5 years.



The species is known for its gentle and passive demeanor, and since it inhabits regions difficult for humans to access, it has not been extensively studied, and much about it remains a mystery.



The E/V Nautilus, owned by the nonprofit organization <a href="https://nautiluslive.org/" target="_blank" rel="noreferrer noopener">Ocean Exploration Trust</a>, is currently exploring the expansive Papahānaumokuākea Marine National Monument. This protected marine area spans over 500,000 square miles in the Pacific, making it larger than all U.S. national parks combined.



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Video and image credit: NOAA Ocean Exploration via the Ocean Exploration Cooperative Institute



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.

Rare and ghostly "Dumbo octopus" captured on film and video in Hawaii

During a recent deep-sea dive off the coast of Hawaii,...

In a recent study, scientists from the University of Florida have unveiled the mysterious process of how hammerhead sharks, renowned for their peculiar head shape, undergo dramatic changes during their gestation. 



“This is a look at how monsters form,” said Gareth Fraser, a UF professor of Biology who supervised the new study. “This is an insight into the development of a wonder of nature that we haven’t seen before and may not be able to see again.”



<h2 class="wp-block-heading" id="h-surprising-transformations-nbsp">Surprising transformations&nbsp;</h2>



The research highlighted the surprising transformations that bonnethead shark <a href="https://www.earth.com/news/baby-birds-can-learn-sounds-before-birth/">embryos</a>, a species of hammerhead, experience during their growth.&nbsp;



Approximately mid-gestation, these two-inch-long embryos begin to widen their heads drastically. This expansion pushes their developing eyes outwards, creating an eerie and unnatural appearance.&nbsp;



Subsequently, the front of this "hammer" shape continues to evolve, moving backward toward the gills until it takes on a shovel-like form. A few months post this transformation, a foot-long shark emerges into the world.



<h2 class="wp-block-heading" id="h-focus-of-the-study-nbsp">Focus of the study&nbsp;</h2>



Steven Byrum, a graduate student, teamed up with Professor Fraser to lead this detailed investigation of bonnetheads, which are abundant in the Gulf of Mexico and the Atlantic Ocean. Given their proximity to the shore, bonnetheads provide a unique opportunity for study.



What makes this study even more remarkable is the inherent challenges in studying the development of hammerheads. Unlike many fish and sharks that lay eggs, which can be studied in a controlled lab environment, hammerheads give birth to live young.&nbsp;



This natural process, combined with the endangered status of many shark species, prevents the harvesting of sharks for developmental research. To conduct this study without causing harm to additional sharks, Fraser’s team utilized preserved embryos from bonnetheads obtained during other biological research endeavors.



<h2 class="wp-block-heading" id="h-unique-opportunity-nbsp">Unique opportunity&nbsp;</h2>



"It’s the perfect qualities of the bonnethead that allowed us to do it with this species," said Byrum. "This was a unique opportunity we may not be able to get for very much longer with bonnetheads and may not be able to get in any other species of hammerhead.”



The study was a collaborative effort that involved Gavin Naylor, director of the Florida Program for Shark Research at the Florida Museum of Natural History, as well as scientists from the South Carolina Department of Natural Resources and Florida State University.



<h2 class="wp-block-heading" id="h-future-research-nbsp">Future research&nbsp;</h2>



This documentation now paves the way for future experiments. The researchers hope to uncover the mechanisms that govern the hammerhead's head shape evolution and to decipher the evolutionary reasons behind their unique features, which are believed to enhance their visual field and ability to detect the electrical movements of their prey.



"Documenting the development of hard-to-access vertebrates, like this viviparous shark species, offers important information about how new and diverse morphologies arise that otherwise may remain poorly studied," wrote the researchers.



"This work will serve as a platform for future comparative developmental research both within sharks and across the phylogeny of vertebrates, underpinning the extreme potential of craniofacial development and morphological diversity in vertebrate animals."



<h2 class="wp-block-heading" id="h-more-about-hammerhead-sharks-nbsp">More about hammerhead sharks&nbsp;</h2>



Hammerhead sharks are a distinctive group of sharks known for their unique, hammer-like head shape which is called a "cephalofoil." This unusual structure provides them with several advantages in their marine environment:



<h3 class="wp-block-heading" id="h-species">Species</h3>



There are nine recognized species of hammerhead sharks, including the well-known great hammerhead, scalloped hammerhead, and the bonnethead. Each species varies in size, habitat, and behavior.



<h3 class="wp-block-heading" id="h-physical-characteristics">Physical Characteristics</h3>



<h4 class="wp-block-heading" id="h-cephalofoil">Cephalofoil</h4>



The hammer-shaped head improves their maneuverability, allowing them to make sharp turns quickly.



<h4 class="wp-block-heading" id="h-eyes">Eyes</h4>



Their eyes are positioned on the ends of the cephalofoil, providing a wide field of vision and improved depth perception.



<h4 class="wp-block-heading" id="h-size">Size</h4>



Hammerheads range in size, with smaller species like the bonnethead measuring around 3 to 4 feet long, while larger species like the great hammerhead can grow up to 20 feet.



<h3 class="wp-block-heading" id="h-habitat-and-distribution">Habitat and distribution</h3>



Hammerhead sharks are found worldwide in warmer waters along coastlines and continental shelves. They typically prefer temperatures ranging from 20 to 30 degrees Celsius (68 to 86 degrees Fahrenheit).



<h3 class="wp-block-heading" id="h-behavior">Behavior</h3>



Some species, like the scalloped hammerhead, often swim in schools, which is unusual for most shark species.



Despite their occasional schooling behavior, hammerheads usually hunt alone, using their cephalofoil to scan the ocean floor for prey.



<h3 class="wp-block-heading" id="h-diet">Diet</h3>



Hammerheads primarily feed on fish, including other sharks, as well as squid, octopus, and crustaceans. Their wide-set eyes give them a better visual range to locate prey, while the cephalofoil assists in trapping stingrays, one of their favorite meals, against the seafloor.



<h3 class="wp-block-heading" id="h-conservation">Conservation</h3>



Many species of hammerhead sharks are classified as endangered or vulnerable due to overfishing and the global shark fin trade. Conservation efforts are ongoing to protect these unique and important marine predators, including establishing shark sanctuaries and implementing fishing regulations.



<h2 class="wp-block-heading" id="h-reproduction">Reproduction</h2>



As mentioned previously, hammerheads give birth to live young. Depending on the species, a female can give birth to a litter ranging from 6 to 42 pups every two years.



<h3 class="wp-block-heading" id="h-hunting-behavior">Hunting behavior</h3>



The cephalofoil is also believed to house a large number of electroreceptors, allowing hammerhead sharks to effectively detect the electrical signals emitted by other marine organisms, making them highly efficient predators.



Understanding and protecting hammerhead sharks is crucial due to their role in maintaining the health and balance of their marine ecosystems. The study by the University of Florida offers valuable insights into their developmental process, adding to the body of knowledge necessary for their conservation and management.



The research is published in the journal <a href="http://dx.doi.org/10.1002/dvdy.658" target="_blank" rel="noreferrer noopener">Developmental Dynamics</a>.



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Making a monster: The bizarre development of hammerhead sharks

In a recent study, scientists from the University of Florida...

People are often learning from those around them without even being aware of it. Such social learning through imitation eliminates the need to start from scratch, ensuring progress is not repeatedly reset to zero.&nbsp;



But what is the origin of this intrinsic skill that underpins cultural learning and, by extension, humanity’s evolutionary trajectory?&nbsp;



A new study led by the Maximilian University of Munich (LMU) has recently found that this unique ability has its roots in early infancy.



“Children acquire their ability to imitate because they themselves are imitated by their caregivers,” said senior author Markus Paulus, the chair of the Developmental Psychology and Educational Psychology Department at LMU.



<h2 class="wp-block-heading" id="h-focus-of-the-study">Focus of the study</h2>



The experts examined the interactions between several pairs of mothers and children over an extended period of time. The research sessions commenced when the infants were six months old and concluded at 18 months.&nbsp;



Through a range of playful interactions, the researchers investigated the imitation patterns observed in these dyads.



<h2 class="wp-block-heading" id="h-reciprocal-imitation-nbsp">Reciprocal imitation&nbsp;</h2>



The analyses revealed a clear correlation: the more a mother sensitively interacted and imitated her six-month-old, the more proficient that child became at imitating others by 18 months.



This reciprocal imitation, apparent between parents and their children, acts as a communicative bridge. Caregivers often mirror the cues provided by their children, enhancing and amplifying them in the process, which leads to a shared imitation of movements and expressions.&nbsp;



“These experiences create connections between what the child feels and does on the one hand and what it sees on the other. Associations are formed. The child’s visual experience is connected to its own motor activity,” Paulus explained.



<h2 class="wp-block-heading" id="h-skill-acquisition-nbsp">Skill acquisition&nbsp;</h2>



Imitation plays a pivotal role in children’s skill acquisition journey – from object handling to cultural norms like hand gestures and even language acquisition.&nbsp;



“Children are incredible imitators. Mimicry paves the way to their further development. Imitation is the start of the cultural process toward becoming human,” Paulus said.&nbsp;



<h2 class="wp-block-heading" id="h-imitation-is-learned-nbsp">Imitation is learned&nbsp;</h2>



While historically the prevailing belief in psychology was that imitation was an innate skill, this new study provides evidence it is a learned rather than instinctual skill.



These findings suggest that the finesse with which children learn to mimic others is intimately tied to the responsive nature of their caregivers. In this context, sensitivity means the caregiver’s knack for recognizing and responding adeptly and swiftly to the child’s cues.&nbsp;



“The sensitivity of the mother is a predictor of how strongly she imitates her child,” said lead author Samuel Essler, a postdoctoral fellow in Developmental Psychology at LMU.



<h2 class="wp-block-heading" id="h-social-interactions">Social interactions</h2>



The research also unravels the essence of what makes us inherently social creatures: our unique abilities that are honed through interpersonal interactions. These human traits are largely influenced by the distinctive methods employed in child-rearing.



“By being part of a social interaction culture, in which they are imitated, children learn to learn from others. Over the course of generations and millennia, this interplay has led to the cultural evolution of humans,” Paulus said.&nbsp;



“Through social learning, certain actions or techniques do not have to be constantly invented anew, but there is a cultural transfer of knowledge. Our results show that the ability to imitate, and thus cultural learning, is itself a product of cultural learning, in particular the parent-child interaction,” he concluded.



The study is published in the journal <a href="https://doi.org/10.1016/j.cub.2023.08.084">Current Biology</a>.



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.

Cultural learning begins in infancy during parent-child imitation 

People are often learning from those around them without even...

As our planet faces escalating challenges from global warming, a group of international scientists will be recruiting a surprising ally in the fight against <a href="https://www.earth.com/news/greenhouse-gas-emissions-reach-another-all-time-high/">greenhouse emissions</a>: the cow.&nbsp;



At the University of Illinois Urbana-Champaign, experts in animal sciences are launching a novel venture aimed at cutting methane emissions due to rumen fermentation in beef and dairy cattle.&nbsp;



<h2 class="wp-block-heading" id="h-greener-cattle">Greener cattle</h2>



Spanning three years and backed by a $3.2-million budget, this undertaking falls under the umbrella of the <a href="https://foundationfar.org/consortia/greener-cattle-initiative/">Greener Cattle Initiative</a>, which is backed by the Foundation for Food and Agriculture Research (FFAR).



Research data indicates that taking on methane might be a faster route to addressing climate issues than solely focusing on carbon dioxide (CO2). Methane’s heat-trapping ability is 28 times stronger than CO2’s, but it exits the atmosphere in roughly a dozen years, while CO2 can linger for centuries.



“What this means is that anything we do now with ruminant animals can have a huge impact on warming within decades, rather than centuries. Our challenge is to reduce enteric methane emissions by about 30 to 40 percent with the technologies we have,” said project leader Rod Mackie, a professor in the Department of Animal Sciences at U of I.&nbsp;



<h2 class="wp-block-heading" id="h-focus-of-the-study">Focus of the study</h2>



Connecting six research centers globally, this project zeroes in on enteric methane – a byproduct of microbial fermentation in the rumen. As a part of this strategy, Mackie and his colleagues aim to examine hydrogen’s role during fermentation.



During the fermentation process, the recycling of an energy-rich molecule, NADH, stands out. For the uninterrupted generation of energy, NADH must release its hydrogen and anticipate a replacement from the decomposition of carbohydrates. Generally, NADH’s surplus hydrogen aids in turning CO2 into methane. Yet, the scientists speculate that there are alternatives to use this type of hydrogen.



“In anaerobic fermentation in the rumen, you have to have some way of recycling hydrogen through the conversion of NADH to NAD. In that process, most of the excess hydrogen goes towards methane. If you shut down methane production, hydrogen builds up and inhibits glycolysis,” Mackie explained.&nbsp;



“We don’t want that to happen. Instead, we want to redirect hydrogen into other products, such as propionate and butyrate, reduced fatty acids that serve as the primary energy source for all ruminants.”



<h2 class="wp-block-heading" id="h-methane-reduction">Methane reduction</h2>



“There are a lot of groups working on inhibiting methane directly using dietary additives. Our focus is trying to figure out how we actually make it work in an animal and make it more energetically feasible. That’s really been the missing piece,” added Josh McCann, an assistant professor of Animal Sciences at the same university, who will also be involved in the project.&nbsp;



“If cows can’t metabolize the excess hydrogens for productive benefit and to improve growth, there will continue to be limited adoption of methane reduction strategies or additives. There’s no economic incentive.”



<h2 class="wp-block-heading" id="h-microbial-communities-nbsp">Microbial communities&nbsp;</h2>



The team’s strategy begins in the lab through a thorough investigation of hydrogen production and its utilization. By examining rumen microbial communities from diverse cattle, the researchers aim to uncover potential tweaks using inhibitor compounds. Their findings will eventually be tested on cattle.



“Most of the grant is focused on the basic and the mechanistic side, but once we make something that might work within a microbial community, it still has to work in an animal,” McCann explained.&nbsp;



<h2 class="wp-block-heading" id="h-methane-inhibitor-nbsp">Methane inhibitor&nbsp;</h2>



“We have complicating factors like diet components and how much they want to eat. Not to mention dairy cattle and beef cattle are eating different things, so the bugs in the rumen function differently. So, if we apply a methane inhibitor to a dairy microbial community, we might have to approach the hydrogen capture a little bit differently than in a beef rumen community.”



Mackie envisions this initiative as the starting point of a long-term quest to tackle enteric methane. By the conclusion of the three-year project, the experts aim to pinpoint precise inhibitor dosages that either maintain or even bolster production capacities.



“What we’d like is to have ruminants save the planet within 10 years. That would be amazing,” Mackie concluded.



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.

Greener cattle: Seeking ways to inhibit methane production in cows

As our planet faces escalating challenges from global warming, a...

A team of researchers led by Dartmouth College has recently used an innovative approach to solve the longstanding debate about what caused the mass <a href="https://www.earth.com/news/dinosaurs-were-in-a-state-of-decline-before-their-extinction/">extinction</a> of dinosaurs and many other species 66 million years ago: Did a colossal asteroid strike or volcanic eruptions lead to their demise? 



To remove potential biases, the experts took the scientists out of the equation and put the decision-making in the hands of computers.



<h2 class="wp-block-heading" id="h-interconnected-processors">Interconnected processors</h2>



The novel modeling technique they used employed interconnected processors to sift through extensive geological and climate data autonomously.&nbsp;



The processors were given the task of retroactively examining the fossil record to identify the sequences and conditions that culminated in the Cretaceous–Paleogene (K–Pg) extinction event. This event set the stage for mammals, including primates and eventually early humans, to rise.



<h2 class="wp-block-heading" id="h-focus-of-the-study">Focus of the study</h2>



“Part of our motivation was to evaluate this question without a predetermined hypothesis or bias,” said lead author Alex Cox, a graduate student in Earth Sciences at Dartmouth.&nbsp;



“Most models move in a forward direction. We adapted a carbon-cycle model to run the other way, using the effect to find the cause through statistics, giving it only the bare minimum of prior information as it worked toward a particular outcome. In the end, it doesn’t matter what we think or what we previously thought - the model shows us how we got to what we see in the geological record.”



This computational model tested over 300,000 potential scenarios spanning a million years around the K–Pg extinction, factoring in variables like carbon dioxide and sulfur dioxide emissions and biological productivity.&nbsp;



<h2 class="wp-block-heading" id="h-machine-learning">Machine learning</h2>



Relying on a machine learning technique known as the Markov Chain Monte Carlo, the processors functioned collaboratively yet independently, continuously refining their findings until a conclusion was reached that aligned with fossil records.



The traces left behind in fossils distinctly portray the catastrophic environment during the K–Pg extinction. There were significant ecological disruptions as food chains crumbled amidst an atmosphere that oscillated drastically due to airborne pollutants.



<h2 class="wp-block-heading" id="h-what-caused-the-dinosaur-extinction">What caused the dinosaur extinction?</h2>



While the evidence of this devastation is clear, the root cause remains a topic of debate. Initial theories that pointed to volcanic eruptions have been overshadowed by the discovery of the Chicxulub impact crater in Mexico, attributed to a massive asteroid believed to be the primary catalyst for the dinosaur extinction.&nbsp;



However, recent findings suggest the asteroid might have struck an Earth already destabilized by powerful volcanic eruptions in India’s Deccan Traps.



Yet, there is still uncertainty about the relative contributions of each event to the extinction. This drove Cox and his advisor, Brenhin Keller, a Dartmouth assistant professor of Earth Sciences and co-author of the study, to “see what you would get if you let the code decide.”



<h2 class="wp-block-heading" id="h-the-deccan-traps">The Deccan Traps</h2>



Their model indicates that the emissions from the Deccan Traps could have alone instigated the global extinction. The Deccan eruptions began approximately 300,000 years before the asteroid’s impact, releasing staggering amounts of gases over nearly a million years.



“We’ve known historically that volcanoes can cause massive extinctions, but this is the first independent estimation of volatile emissions taken from the evidence of their environmental effects,” Keller explained.&nbsp;



“Our model worked through the data independently and without human bias to determine the amount of carbon dioxide and sulfur dioxide required to produce the climate and carbon cycle disruptions we see in the geologic record. These amounts turned out to be consistent with what we expect to see in emissions from the Deccan Traps.”&nbsp;



<h2 class="wp-block-heading" id="h-surge-in-gas-emissions-nbsp">Surge in gas emissions&nbsp;</h2>



While the model recognized a significant decline in organic carbon accumulation in deep-sea regions around the Chicxulub impact timeframe, it revealed no surge in gas emissions during the period, implying that the asteroid’s role in the extinction wasn’t primarily linked to gas emissions.



Comparing historical events to modern times, Cox noted that between 2000 and 2023, fossil fuel burning released roughly 16 billion tons of carbon dioxide annually, a rate 100 times more intense than the Deccan Traps’ highest yearly emissions. However, it would still take millennia for current emission levels to equal the total output of these ancient eruptions.



<h2 class="wp-block-heading" id="h-impressive-results">Impressive results</h2>



“Most heartening is that the results we achieved are broadly physically plausible, which is impressive given that the model could have technically run completely wild without stronger prior constraints,” Cox said.



The integration of processors sped up the data analysis, trimming what could have taken years down to mere hours. This method developed by Cox and Keller can be applied to other earth systems models, enabling researchers to delve deeper into well-documented geological events where the outcomes are clear but the preceding conditions remain elusive.



“This type of parallel inversion hasn't been done in earth sciences models before. Our method can be scaled up to include thousands of processors, which gives us a much broader solution space to explore, and it’s quite resistant to human bias,” remarked Cox.



“So far, people in our field have been more fascinated by the novelty of the method than the conclusion we reached. Any earth system for which we know the effect but not the cause is ripe for inversion. The better we know the output, the better we’re able to characterize the input that caused it.”



The study is published in the journal <a href="http://dx.doi.org/10.1126/science.adh3875" target="_blank" rel="noreferrer noopener">Science</a>.



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Violent volcanic eruptions likely caused dinosaur extinction

A team of researchers led by Dartmouth College has recently...

Experts have identified a fascinating new species of dinosaur, Garumbatitan morellensis, which inhabited the Iberian Peninsula approximately 122 million years ago during the Early Cretaceous period.&nbsp;



The remains were uncovered in the Morella region of Spain, highlighting the region's significant contribution to the understanding of dinosaur diversity in Europe. Sedimentary deposits in this region have been found to contain an abundant record of dinosaurs from the Early <a href="https://www.earth.com/news/scientists-shed-new-light-on-europes-enigmatic-dinosaurs/" target="_blank" rel="noreferrer noopener">Cretaceous</a>.



<h2 class="wp-block-heading" id="h-new-cretaceous-dinosaur">New Cretaceous dinosaur</h2>



Garumbatitan morellensis belongs to the <a href="https://www.earth.com/news/new-species-of-sauropod-dinosaur-discovered/">sauropod</a> group, characterized by their immense size, quadrupedal stature, herbivorous diet, and distinctive long necks and tails.&nbsp;



The new dinosaur was identified by a team of Spanish and Portuguese paleontologists, whose findings were recently published in the <a href="http://dx.doi.org/10.1093/zoolinnean/zlad124" target="_blank" rel="noreferrer noopener">Zoological Journal of the Linnean Society</a>.&nbsp;



<h2 class="wp-block-heading" id="h-historical-significance">Historical significance</h2>



Morella has a history of significant fossil discoveries, with the region yielding some of Spain's first dinosaur fossils. In recent years, there has been an upsurge in the discovery of relevant Mesozoic vertebrate fossils, including a notable collection of ornithopod dinosaurs like Morelladon beltrani and other sauropods.



One of the unique aspects of Garumbatitan morellensis is its distinct anatomical characteristics, separating it from other known sauropods. Its femur shares similarities with those of later sauropods from the Late Cretaceous, while the elements forming the foot exhibit unique morphologies.



“One of the individuals we found stands out for its large size, with vertebrae more than one meter wide, and a femur that could reach two meters in length," said Pedro Mocho, a paleontologist at the <a href="https://www.ulisboa.pt/en" target="_blank" rel="noreferrer noopener">University of Lisbon</a>. "We found two almost complete and articulated feet in this deposit, which is particularly rare in the geological record."



<h2 class="wp-block-heading" id="h-evolutionary-implications">Evolutionary implications</h2>



“Our study highlights the enormous complexity of the evolutionary history of sauropods from the European Cretaceous - in particular, from the Iberian Peninsula, with species related to lineages present in Asia and North America, as well as some groups related to forms from the African continent. Our results suggest the existence of periods of faunal dispersal between these continents," explained Pedro Mocho.&nbsp;



“The future restoration of all fossil materials found in this deposit will add important information to understand the initial evolution of this group of sauropods that dominated dinosaur faunas during the last million years of the Mesozoic era," noted study co-author Francisco Ortega of the Universidad Nacional de Educación a Distancia (UNED).



<h2 class="wp-block-heading" id="h-garumbatitan-morellensis">Garumbatitan morellensis</h2>



The name Garumbatitan morellensis carries significant meaning. “Garumbatitan” translates to “the giant of Garumba,” referencing the base of Mola de la Garumba where the specimen was found.&nbsp;



Meanwhile, “morellensis” pays homage to the location of the deposit, Morella. These fossil remains are now part of the extensive collection of the Iberian Mesozoic at the Temps Museum of Dinosaurs in Morella, contributing to the Valencian Community Museum Network’s offering.



<h2 class="wp-block-heading" id="h-study-implications-nbsp">Study implications&nbsp;</h2>



The introduction of Garumbatitan morellensis to the scientific community not only emphasizes the rich dinosaur diversity in the Early Cretaceous but also provides crucial insights into their evolutionary history.&nbsp;



With the promise of future restoration and study of these fossils, the discovery may ultimately help to clarify the initial evolution of the sauropod group that dominated the dinosaur landscape of the Mesozoic era.



<h2 class="wp-block-heading" id="h-more-about-the-cretaceous-period">More about the Cretaceous period</h2>



The Cretaceous period spanned from approximately 145 to 66 million years ago. It ushered in a diverse array of dinosaurs that dominated the land, air, and sea. This era, last of the three periods of the Mesozoic Era, saw the rise of iconic dinosaurs like the <a href="https://www.earth.com/news/an-estimated-2-5-billion-tyrannosaurus-rexes-lived-and-died-on-earth/" target="_blank" rel="noreferrer noopener">Tyrannosaurus rex</a>, the <a href="https://www.earth.com/news/triceratops-horns-attract-mates/" target="_blank" rel="noreferrer noopener">Triceratops</a>, and as mentioned above, Garumbatitan morellensis. The Cretaceous ended with one of the most significant mass extinction events in Earth's history.



<h3 class="wp-block-heading">Diversity and adaptation</h3>



Cretaceous dinosaurs exhibited remarkable diversity and adaptability, populating every continent and evolving a myriad of forms, sizes, and ecological roles. Small, feathered theropods like Velociraptor roamed the lands, showcasing the link between dinosaurs and modern birds. Larger predators like Spinosaurus, with its distinctive sailback, pursued prey in aquatic environments.



<h3 class="wp-block-heading">Herbivorous giants</h3>



Massive herbivores such as the long-necked sauropods also marked the landscapes of the Cretaceous. Titanosaurs, the last surviving group of long-necked sauropods, roamed the Southern Hemisphere, revealing the evolutionary success of herbivorous dinosaurs. Triceratops, recognized by their prominent frills and horns, browsed the lush vegetation. They represented a group of herbivorous dinosaurs known as ceratopsians.



<h3 class="wp-block-heading">Flora and climate</h3>



Rich and diverse flora characterized the Cretaceous landscapes. Flowering plants, or angiosperms, made their first appearance, rapidly diversifying and providing new food sources for herbivorous dinosaurs. The global climate was warmer, with higher sea levels creating shallow seas and dividing continents. These conditions shaped the distinct dinosaur faunas in different regions.



<h3 class="wp-block-heading">Birds and flight</h3>



The Cretaceous period witnessed the evolutionary transition from non-avian dinosaurs to birds. Archaeopteryx, often regarded as the first bird, illustrated the morphological changes from theropod dinosaurs to modern avian species. Pterosaurs, with their membranous wings, dominated the skies, showcasing various adaptations for flight and feeding.



<h3 class="wp-block-heading">Cretaceous–Paleogene extinction event</h3>



The fascinating journey of the Cretaceous dinosaurs concluded with the <a href="https://www.earth.com/news/natures-true-survivors-flowering-plants-lived-through-the-dinosaur-extinction/" target="_blank" rel="noreferrer noopener">Cretaceous–Paleogene extinction event</a> around 66 million years ago. A colossal asteroid impact, combined with extensive volcanic activity, dramatically altered the Earth’s climate. This ultimately led to the demise of the non-avian dinosaurs. The remnants of this impact form the Chicxulub crater, located on the Yucatán Peninsula.



In summary, the Cretaceous period illuminates the adaptability and diversity of dinosaurs in a dynamically changing world. The dinosaurs of this era, from the fearsome T. rex to the soaring Pterosaurs to Garumbatitan morellensis, showcase the evolutionary innovations and ecological roles that these creatures occupied. 



The advancements in paleontology continue to uncover new dinosaur species and provide deeper insights into their lives, behaviors, and environments. This ongoing research enhances our understanding of the intricate tapestry of life during the Cretaceous period. The fossil record from this time not only serves as a window into our planet’s past, but also as a reminder of the ever-present possibility of change and adaptation in the natural world.



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Image Credit: Grup Guix



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Massive new dinosaur discovered in Spain's Early Cretaceous fossil collection

Experts have identified a fascinating new species of dinosaur, Garumbatitan...

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



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



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



Video/ Image Credit: ESA



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

Nushagak Bay in southwest Alaska

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



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



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



Video/ Image Credit: American Chemical Society&nbsp;



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



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Flu viruses are more flexible than expected

[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

[sendtonews key="3upvlAaHgO-2256633-12187" 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> 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.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&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.

Kainji Lake in north central Nigeria

[sendtonews key="iuA5mpp3jv-1641775-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



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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.

Designing crops that can beat the heat

[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"] Today’s Video of the Day from Carl...

Featuring a green body with orange, blue, and black spots, the mandarin fish is easy to identify. These small fish live in the coral reefs of the Western Pacific.

Mandarin Fish

This hummingbird is native to the Talamancan montane forests of Costa Rica. The birds are a rainbow of color with a shiny green body, blue tail, brilliant blue crown, yellow-boardered bright orange throat, and violet blue chest patch.