Today's Image of the Day from the European Space Agency features Mount Fuji, Japan’s highest peak, where snow has finally returned after a record-breaking absence.



The Japan Meteorological Agency officially confirmed the presence of snow on Mount Fuji's peak on Thursday. The previous day, the snow could not yet be confirmed due to clouds obstructing the view of the summit.



“The Copernicus Sentinel-2 mission captured this image of Mount Fuji's iconic snowcap on November 7, a day after snow was first spotted by the Japan Mereological Agency’s Shizuoka branch,” noted <a href="https://search.app?link=https%3A%2F%2Fwww.esa.int%2FESA_Multimedia%2FImages&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">ESA</a>.



<h2 class="wp-block-heading" id="h-mount-fuji-with-no-snow">Mount Fuji with no snow</h2>



This year, Mount Fuji set a new <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fmount-fujis-snow-is-missing-for-first-time-in-130-years%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">record</a> for the latest date without snowfall since records began in 1894. By the end of October, the iconic peak remained bare, surpassing the previous records of October 26, held in 2016 and 1955. 



The snow delay is attributed to record-breaking high temperatures in Japan throughout the summer and early fall.&nbsp;



The heat was influenced by factors such as El Niño, unusually warm <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fpacific-ocean-temperatures-highest-in-650-years-greatly-harming-coral-reefs%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">sea surface temperatures</a>, and shifts in the jet stream - all of which contributed to sustained warmth and hindered the usual cooling needed for snowfall​​​​​​.



<h2 class="wp-block-heading" id="h-broader-climate-concerns">Broader climate concerns</h2>



This unusual absence of snow on Mount Fuji has raised concerns about broader impacts of climate change. Snow on Mount Fuji contributes to regional freshwater supplies, suggesting potential downstream effects on water availability if these trends continue.&nbsp;



Scientists are closely studying these seasonal shifts to understand their long-term environmental implications​​​​.



<h2 class="wp-block-heading" id="h-cultural-significance-of-mount-fuji-s-snow">Cultural significance of Mount Fuji's snow</h2>



Snow on Mount Fuji holds deep cultural significance for Japan, symbolizing purity, beauty, and spiritual presence. In Japanese art and literature, the snow-capped Mount Fuji is celebrated as a representation of the changing seasons, serenity, and natural perfection. 



For centuries, it has inspired countless artists, including Edo-period woodblock masters like Hokusai, whose famous series Thirty-Six Views of Mount Fuji highlights the mountain's snowy peak as a central theme.



The snow on Mount Fuji also holds spiritual significance. Many Japanese people view the mountain as sacred and associate its snow-covered peak with divine purity and tranquility. 



Shinto and Buddhist pilgrims have historically considered Fuji’s summit a place of spiritual connection, and its snowy cap enhances this reverence by emphasizing the mountain’s sublime, almost otherworldly beauty​​​​.



Mount Fuji and its snow cap have become a national symbol of resilience and identity, even influencing aspects of Japanese aesthetics. The snow represents harmony with nature and the cyclical beauty of life, which are core themes in Japanese cultural philosophy.



<h2 class="wp-block-heading" id="h-seasons-are-changing-with-the-climate">Seasons are changing with the climate</h2>



<a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fextreme-ocean-heating-signals-alarm-for-a-3c-warmer-world%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">Climate change</a> is shifting the timing and length of seasons worldwide. Rising global temperatures have led to significant changes in seasonal patterns, affecting when plants bloom, animals migrate, and weather patterns stabilize.



<h3 class="wp-block-heading" id="h-temperature-shifts">Temperature shifts</h3>



Warmer global temperatures have contributed to longer and more intense <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fsummers-seasons-warm-faster-than-winters-earths-climate-history%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">summers</a>. For instance, spring arrives earlier in many parts of the world, with evidence showing that plants are budding and blooming sooner than they did several decades ago​​.&nbsp;



This extended warmth shortens winter and affects the typical cycles that ecosystems depend on.



<h3 class="wp-block-heading" id="h-impact-on-ecosystems">Impact on ecosystems</h3>



The shift in seasons can disrupt ecosystems that have evolved to rely on consistent seasonal changes.&nbsp;



For example, migratory <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fbirds-produce-fewer-offspring-as-spring-arrives-earlier-across-our-warming-world%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">birds</a> often time their movements based on day length and food availability. If the seasons shift and food sources appear or disappear earlier than usual, these birds may struggle to adapt. 



Similarly, in agricultural systems, unpredictable frost dates and changing rainy seasons can reduce crop yields and impact food security​​​​.



<h3 class="wp-block-heading" id="h-water-cycles-and-weather-patterns">Water cycles and weather patterns</h3>



Seasonal shifts also affect water availability. Warmer winters with less snow impact water supplies, especially in regions dependent on snowpack for spring and summer water flow. This can lead to drier conditions and exacerbate droughts, as seen in many parts of North America and Asia​​.



Ultimately, the seasonal shifts driven by climate change have far-reaching effects on natural ecosystems, agriculture, and human infrastructure - making climate adaptation an urgent priority.



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Snow returns to Mount Fuji after record absence 

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

Today's Image of the Day from the European Space Agency features Messier 78 (M78), a reflection nebula located in the constellation Orion about 1,350 light-years away from Earth. 



This image was released as part of the initial series of observations from ESA's <a href="https://www.esa.int/Science_Exploration/Space_Science/Euclid" target="_blank" rel="noreferrer noopener">Euclid space mission</a>.&nbsp;



All data collected during these early observations, including a series of incredible <a href="https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_s_first_images_the_dazzling_edge_of_darkness" target="_blank" rel="noreferrer noopener">new views</a> of the nearby universe, is available to the public. 



<h2 class="wp-block-heading" id="h-image-of-messier-78">Image of Messier 78</h2>



Featured here is a high-resolution, detailed segment of a larger image showcasing Messier 78, a dynamic region of star formation obscured by cosmic dust.&nbsp;



This specific view highlights how young stars generate winds of charged particles, carving out “cavities” in the molecular clouds around them.&nbsp;



The blue hues in the image represent ionized atomic hydrogen, which is a primary component of the cloud, while the red indicates the absorption and scattering of light by dust particles.



The image captures hundreds of stars varying in brightness, illuminating their nebulous, purple surroundings. A dark, arch-like structure stretches from the upper left to the bottom right of the frame, merging into the densest, darkest clouds at the image’s base.



<h2 class="wp-block-heading" id="h-active-site-of-star-formation-nbsp">Active site of star formation&nbsp;</h2>



Messier 78 is not just a single nebula but part of a larger complex of stars and nebulous regions in <a href="https://www.earth.com/news/orion-nebula-destroys-an-oceans-worth-of-water-every-month/" target="_blank" rel="noreferrer noopener">Orion</a>, which includes various other objects like dark nebulae that are visible as patches blocking light from behind.



This region is an active site of star formation, featuring many young stars and protostars, which are stars in the early stages of formation.&nbsp;



<h2 class="wp-block-heading" id="h-viewing-messier-78">Viewing Messier 78</h2>



M78 is easily observable with small telescopes, and it appears as a hazy patch of light with two prominent stars near its center, which illuminate the surrounding dust.&nbsp;



The nebula is also a favorite among amateur astronomers for its beauty and relatively bright appearance.



<h2 class="wp-block-heading" id="h-subject-of-scientific-interest-nbsp">Subject of scientific interest&nbsp;</h2>



Messier 78 is fascinating not only for its visual beauty but also for its scientific interest, particularly in the study of <a href="https://www.earth.com/news/baby-stars-release-sneezes-of-gas-and-dust-as-they-develop/" target="_blank" rel="noreferrer noopener">star formation</a> and interstellar matter.&nbsp;



The nebula consists of dense, cold gas and dust, which are essential ingredients for the birth of new stars.&nbsp;



The intense blue light that characterizes M78 is due to the reflection of starlight off these dust particles, a process known as scattering.



<h2 class="wp-block-heading" id="h-region-surrounding-messier-78-nbsp">Region surrounding Messier 78&nbsp;</h2>



The region surrounding M78 includes several other interesting features. For instance, there are Herbig-Haro objects within it, which are small patches of nebulosity associated with <a href="https://www.earth.com/news/new-molecule-detected-in-space-where-stars-are-born/" target="_blank" rel="noreferrer noopener">newly born stars</a>.&nbsp;



These objects are formed when gas ejected by young stars collides with clouds of gas and dust at high speeds, creating shock waves that glow brightly.



<h2 class="wp-block-heading" id="h-earliest-stages-of-star-development-nbsp">Earliest stages of star development&nbsp;</h2>



Additionally, infrared observations of M78 have revealed much about the dust and colder objects in the area, which are not visible in optical light.&nbsp;



The observations have helped astronomers identify numerous young stars and brown dwarfs (objects that are too large to be planets and too small to be stars) within the nebula. 



This makes M78 a critical area for studying the earliest stages of star development and the properties of the interstellar medium.



<h2 class="wp-block-heading" id="h-euclid-space-mission-nbsp-0">Euclid space mission&nbsp;</h2>



The <a href="https://www.earth.com/news/new-batch-of-brilliant-images-from-the-euclid-mission-live-up-to-the-hype/" target="_blank" rel="noreferrer noopener">Euclid space mission</a> is a European Space Agency (ESA) mission designed to study the dark universe, particularly focusing on dark energy and dark matter, which are fundamental components that are believed to drive the accelerating expansion of the universe and shape its large-scale structure.&nbsp;



The mission aims to map the geometry of the dark universe and better understand the physics of the cosmos.



<h3 class="wp-block-heading" id="h-observing-billions-of-galaxies-nbsp">Observing billions of galaxies&nbsp;</h3>



Euclid uses two primary scientific instruments: a visible light camera (VIS) and a near-infrared spectrometer and photometer (NISP).&nbsp;



These instruments will allow Euclid to measure the shapes and redshifts of galaxies at distances of up to 10 billion light-years. By surveying more than a third of the sky, the mission is expected to observe several billion galaxies.



<h3 class="wp-block-heading" id="h-studying-the-dark-universe-nbsp">Studying the dark universe&nbsp;</h3>



The data collected will help astronomers in studying the effects of dark matter and dark energy in depth, testing cosmological models, and exploring new theories about the nature of the universe.&nbsp;



The mission, named after the ancient Greek mathematician Euclid, seeks to address key questions related to the structure of the universe and the fundamental laws of physics governing its evolution and expansion.



Image Credit: European Space Agency&nbsp;



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Messier 78: Young stars shine through dense dust

Today's Image of the Day from the European Space Agency features the Cat's Eye Nebula (NGC 6543), located about 3,300 light-years from Earth in the constellation Draco.&nbsp;



The nebula's name comes from its eye-like appearance when viewed through a telescope. This particular image, which reveals the <a href="https://www.earth.com/news/horsehead-nebula-webb-telescope-captured-unprecedented-detail/" target="_blank" rel="noreferrer noopener">nebula</a> in stunning detail, was captured by the NASA/ESA Hubble Space Telescope.



<h2 class="wp-block-heading" id="h-planetary-nebulae-nbsp">Planetary nebulae&nbsp;</h2>



According to ESA, the Cat's Eye Nebula is one of the most complex planetary nebulae that has ever been discovered.



“A planetary nebula forms when Sun-like stars gently eject their outer gaseous layers to form bright nebulae with amazing twisted shapes," explained <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"Until recently, it was thought that shells around planetary nebulae were a rare phenomenon. However, astronomers have instead shown that these rings are likely to be the rule rather than the exception."



<h2 class="wp-block-heading" id="h-appearance-of-the-cat-s-eye-nebula-nbsp">Appearance of the Cat's Eye Nebula&nbsp;</h2>



The central focus of the Cat's Eye is a hot, dying star that has shed its outer layers to form the <a href="https://www.earth.com/news/dragons-egg-nebula-is-a-truly-stunning-sight-to-behold/" target="_blank" rel="noreferrer noopener">nebula</a>. It is surrounded by concentric gas shells, jets of high-speed gas, and unusual shock-induced knots of gas.



“Although the rings may be the key to explaining the final ‘gasp’ of the dying central star, the mystery behind the Cat’s Eye Nebula’s nested ‘Russian doll’ structure remains largely unsolved,” noted ESA.



<h2 class="wp-block-heading" id="h-rings-around-the-cat-s-eye">Rings around the Cat’s Eye</h2>



“This image, taken with Hubble's Advanced Camera for Surveys (ACS), reveals the full pattern of eleven or more concentric rings, or shells, around the Cat’s Eye. Each ‘ring’ is actually the edge of a spherical bubble seen projected onto the sky - which is why it appears bright along its outer edge.”



According to ESA, observations suggest that the star ejected its mass in a series of pulses at 1,500-year intervals. “These convulsions created dust shells that each contains as much mass as all of the planets in our solar system combined.”



Several explanations have been proposed for this phenomenon, including cycles of magnetic activity similar to our Sun's sunspot cycle, the influence of companion stars orbiting the <a href="https://www.earth.com/news/dying-stars-may-be-a-source-of-gravitational-waves/" target="_blank" rel="noreferrer noopener">dying star</a>, or stellar pulsations.&nbsp;



Another theory suggests that the material is ejected smoothly from the star, with the rings forming later due to the creation of waves in the outflowing material.



<h2 class="wp-block-heading" id="h-the-constellation-draco-nbsp">The constellation Draco&nbsp;</h2>



<a href="https://www.earth.com/news/extrasolar-ocean-planet-discovered-in-the-draco-constellation/" target="_blank" rel="noreferrer noopener">Draco</a> is a constellation in the northern sky that represents a dragon. It's one of the largest constellations, winding between the Big and Little Dippers.&nbsp;



In Greek mythology, Draco is often identified as the dragon Ladon, who guarded the golden apples in the garden of the Hesperides.



Draco is a circumpolar constellation for most northern hemisphere observers, meaning it never sets below the horizon and can be seen all year round.



<h2 class="wp-block-heading" id="h-famous-planetary-nebulae">Famous planetary nebulae </h2>



Planetary nebulae are some of the most beautiful and intriguing objects in the universe.&nbsp;



One of the most famous is the Ring Nebula, or M57, located in the constellation Lyra. This nebula is renowned for its nearly perfect ring shape, which is the result of a dying star shedding its outer layers.&nbsp;



Another well-known planetary nebula is the Helix Nebula, or NGC 7293, often referred to as the "Eye of God" due to its eye-like appearance. The Helix Nebula is one of the closest planetary nebulae to Earth, making it a popular target for amateur astronomers.&nbsp;



The Dumbbell Nebula, or M27, in the constellation Vulpecula, is another striking example. It is named for its resemblance to a dumbbell and is notable for being the first planetary nebula ever discovered, by Charles Messier in 1764.&nbsp;



The Butterfly Nebula, or NGC 6302, is located in the constellation Scorpius. Its name comes from its distinctive bipolar structure, resembling the wings of a butterfly. The nebula's central star is one of the hottest known, with a surface temperature of around 250,000 degrees Celsius.&nbsp;



The Eskimo Nebula, or NGC 2392, in the constellation Gemini, is known for its resemblance to a face surrounded by a fur parka, which gives it its name. Its intricate structure, including filaments and bubble-like shapes, makes it a fascinating object of study. 



These nebulae not only captivate us with their beauty but also provide valuable insights into the life cycles of stars and the processes that shape our galaxy.



Image Credit: NASA/ESA Hubble Space Telescope



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Cat's Eye Nebula in the constellation Draco

Today's Image of the Day from the European Space Agency features the barred spiral galaxy NGC 3783, which is located about 130 million light-years away in the constellation Centaurus. NGC 3783 is also the most prominent of a galaxy group (by the same name) that contains 47 galaxies. 



<h2 class="wp-block-heading" id="h-galaxy-groups">Galaxy groups</h2>



“Like galaxy clusters, galaxy groups are aggregates of gravitationally bound galaxies. Galaxy groups, however, are less massive and contain fewer members than <a href="https://www.earth.com/news/titanic-galaxy-cluster-collision-defies-all-current-understanding-of-the-universe/" target="_blank" rel="noreferrer noopener">galaxy clusters</a> do: where galaxy clusters can contain hundreds or even thousands of constituent galaxies, galaxy groups do not typically include more than 50,” noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



“The Milky Way is actually part of a galaxy group, known as the Local Group, which contains two other large galaxies (Andromeda and the Triangulum galaxy), as well as several dozen satellite and dwarf galaxies.”



<h2 class="wp-block-heading" id="h-hd-101274-a-blue-giant-star">HD 101274: A blue giant star</h2>



The bright object that appears to the right of the galaxy is the star HD 101274. “The perspective in this image makes the star and the galaxy look like close companions, but this is an illusion. HD 101274 lies only about 1,530 light-years from Earth, meaning it is about 85 thousand times closer than NGC 3783,” explained ESA.&nbsp;



The star is part of the NGC 3766 cluster, which is sometimes referred to as the Pearl Cluster, an open cluster known for its richness in bright stars and its relatively young age.



HD 101274 is categorized as a blue giant star, characterized by its high temperature and luminosity. 



Blue giants are massive stars that have left the main sequence phase of stellar evolution and are burning helium or heavier elements in their cores. These stars are known for their short lifespans relative to smaller stars due to their rapid consumption of nuclear fuel.



<h2 class="wp-block-heading" id="h-significance-of-blue-giants">Significance of blue giants</h2>



<a href="https://www.earth.com/news/dark-stars-scientists-discover-a-new-type-of-star-powered-by-dark-matter/" target="_blank" rel="noreferrer noopener">Stars</a> like HD 101274 are important for astronomers because they help in studying the properties of stellar populations in clusters and the dynamics of stellar evolution in different environments. 



The spectral and photometric observations of such stars can provide valuable insights into the characteristics of their atmospheres, internal structures, and the processes occurring within and around them.



<h2 class="wp-block-heading" id="h-bright-central-region-of-ngc-3783">Bright central region of NGC 3783</h2>



One of the most interesting aspects of NGC 3783 is that it harbors an active galactic nucleus, meaning its central region is exceptionally luminous, likely due to the presence of a supermassive black hole. This black hole is actively accreting material, which emits a substantial amount of radiation as it spirals inward and heats up.



The galaxy is particularly known for its bright central region and has been studied extensively in the ultraviolet and X-ray light spectra to understand better the properties of the accretion disk around the black hole and the complex dynamics of the material surrounding it. These studies are crucial for understanding the physics of active galactic nuclei and the role they play in <a href="https://www.earth.com/news/galaxies-like-our-own-milky-way-are-not-unique/" target="_blank" rel="noreferrer noopener">galaxy evolution</a>.



According to ESA, NGC 3783 is a&nbsp;Type I Seyfert galaxy. “In this image it is recorded by Hubble in incredible detail, from its glowing central bar to its narrow, winding arms and the dust threaded through them, thanks to five separate images taken in different wavelengths of light," noted ESA.



“In fact, the galactic center is bright enough to Hubble that it exhibits diffraction spikes, normally only seen on stars such as HD 101274.”



<h2 class="wp-block-heading" id="h-more-about-the-ngc-3783-galaxy-group">More about the NGC 3783 galaxy group</h2>



The NGC 3783 group is part of the larger Hydra-Centaurus Supercluster, which itself is a massive collection of <a href="https://www.earth.com/news/shapes-of-one-million-galaxies-hint-at-the-universes-origins/" target="_blank" rel="noreferrer noopener">galaxies</a> and galaxy clusters located primarily in the constellations of Hydra and Centaurus.



The NGC 3783 group consists of several galaxies that are gravitationally bound and interact with each other. These interactions can influence the galaxies' evolution through mechanisms like tidal forces and merger events, which can trigger star formation, fuel central black holes, and reshape the galaxies' structures.



Studying groups like the NGC 3783 group helps astronomers understand how <a href="https://www.earth.com/news/ceers-2112-ancient-galaxy-looks-strikingly-similar-to-ours/" target="_blank" rel="noreferrer noopener">galaxies</a> evolve together in a common gravitational environment, offering insights into the dynamics and evolution of structures on cosmic scales. 



Image Credit: ESA/Hubble &amp; NASA



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Luminous galaxy NGC 3783 and a blue giant star

Today's Image of the Day from NASA Earth Observatory features a 9.5-mile section of Pangong Lake on the western end of the Tibetan Plateau. The image was captured on by a crew member onboard the International Space Station.&nbsp;



“In this winter scene, a sheet of cracked ice tops part of the lake,” noted <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>. “On the left side, open water appears blue. Shallow water offshore of a delta, formed by a small, winding river, appears green."



"Parallel lines along the coastlines of bays are visible in the high-resolution version of this image. These lines indicate raised beaches, which formed in the past when lake levels were higher.”



NASA pointed out that several roads cut across the landscape, including one with switchbacks that ascends a steep slope. "These roads facilitate tourist travel from both India and China.”&nbsp;



<h2 class="wp-block-heading" id="h-migratory-birds-at-pangong-lake-nbsp">Migratory birds at Pangong Lake&nbsp;</h2>



Pangong Lake and its surroundings are home to numerous bird species, particularly <a href="https://www.earth.com/news/migratory-birds-burn-unexpected-amounts-of-protein/" target="_blank" rel="noreferrer noopener">migratory birds</a>. Visitors can spot various waterfowl and waders that are rarely seen elsewhere.



“During the summer, species such as bar-headed geese and Brahminy ducks attract bird watchers to the lake, which is a major breeding ground for migrating birds,” said NASA.



Pangong Lake is one of the few places in India where the endangered black-necked crane is found during its breeding season. 



Ruddy shelduck and brown-headed <a href="https://www.earth.com/news/gulls-are-shifting-their-habitats-to-urban-areas/" target="_blank" rel="noreferrer noopener">gulls</a> are also frequently spotted around the lake. The ruddy shelduck is known for its striking orange-brown body and creamy white head, while the brown-headed gulls are often seen flying or swimming in the lake.



<h2 class="wp-block-heading" id="h-pangong-lake-nbsp">Pangong Lake&nbsp;</h2>



Pangong Lake is a stunning high-altitude lake situated in the <a href="https://www.earth.com/news/temperatures-are-rising-unexpectedly-fast-on-the-tibetan-plateau/" target="_blank" rel="noreferrer noopener">Himalayas</a>, extending from India to the Tibetan Autonomous Region of China. It is renowned for its mesmerizing beauty and dramatic setting, with the lake lying at an elevation of about 4,350 meters.



One of the most distinctive features of Pangong Lake is its changing colors, ranging from shades of blue to green and even red, influenced by the sky's reflection and the lake's mineral content.



This saline water lake is approximately 134 kilometers long and 5 kilometers wide at its broadest point. Despite its considerable size, Pangong Lake is relatively shallow. 



The lake gained additional popularity after being featured in several Indian films - most notably the Bollywood hit "3 Idiots." Its remote location requires a permit for visitors, especially due to its proximity to the Line of Actual Control between India and China.



Despite the geopolitical sensitivities surrounding its location, Pangong Lake remains a favorite among tourists for its unparalleled natural beauty and serene environment.



<h2 class="wp-block-heading" id="h-high-altitude-lakes">High-altitude lakes</h2>



High-altitude lakes are unique bodies of water found at elevations typically above 3,000 meters (about 10,000 feet) in mountain ranges like the <a href="https://www.earth.com/news/himalayan-glaciers-retreating-threat-is-much-worse-than-previously-believed/" target="_blank" rel="noreferrer noopener">Himalayas</a>, Andes, and Rockies. 



These lakes are formed either by glacial activity, where glaciers erode the earth to create depressions that fill with melted snow and rainwater, or when natural dams created by landslides or moraines trap water in valleys.



<h3 class="wp-block-heading" id="h-extreme-environments">Extreme environments</h3>



The conditions at high altitudes make these lakes distinct in several ways. The climate is typically colder and harsher, with significant temperature variations between day and night. 



This extreme environment affects both the physical characteristics of the <a href="https://www.earth.com/news/alarming-study-most-of-the-worlds-largest-lakes-are-quickly-losing-water/" target="_blank" rel="noreferrer noopener">lakes</a> and the types of ecosystems they support. For example, due to lower atmospheric pressure, the boiling point of water is reduced, which can affect the type of life that can survive in these regions.



<h3 class="wp-block-heading" id="h-critical-habitats">Critical habitats</h3>



Biologically, high-altitude lakes often have limited biodiversity because only certain types of plants and animals can tolerate the cold temperatures and lower oxygen levels in the water. 



Despite this, these lakes are crucial habitats for some unique species of fish, birds, and other wildlife. They also serve as important indicators of climate change, as variations in their water levels and temperatures can reflect environmental shifts.



<h3 class="wp-block-heading" id="h-significance-of-high-altitude-lakes">Significance of high-altitude lakes </h3>



Lakes at high altitudes are often clear and pristine, due to the low density of human populations in these areas and minimal industrial activity, making them significant for ecological studies and attractive for tourism. 



However, they are sensitive ecosystems, and increased tourist activity brings challenges like pollution and habitat disruption.



High-altitude lakes are not only beautiful and scientifically significant but also hold cultural importance for local communities, often considered sacred and associated with historical and spiritual significance.



Image Credit: NASA Earth Observatory&nbsp;



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Pangong Lake on the Tibetan Plateau

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

Today's Image of the Day from the European Space Agency features the aftermath of devastating floods in the Valencia region of Eastern Spain.&nbsp;



On October 29, 2024, torrential rainfall unleashed nearly a year’s worth of precipitation in just eight hours, leading to catastrophic flash floods that affected a vast area from Málaga to Valencia. 



<h2 class="wp-block-heading" id="h-flash-floods-in-valencia">Flash floods in Valencia </h2>



<a href="https://www.earth.com/news/flash-floods-are-set-to-become-much-more-common-in-the-u-s/">Floodwaters</a> submerged entire neighborhoods and agricultural lands. Many roads and infrastructure were overwhelmed almost instantly, stranding vehicles and prompting widespread evacuations. Water levels rose faster than emergency services could respond.



One resident of Paiporta, near Valencia, told the BBC that when the water started to rise it was "like a tsunami wave."



“In a matter of minutes, flash floods caused by heavy downpours in eastern Spain swept away everything in their path. With no time to react, people were trapped in vehicles, homes and businesses,” reported the Associated Press.



More than 200 people were killed and thousands of people were rescued. According to SOS Desaparecidos, as many as 1,300 people remained unaccounted for on Friday, three days after the floods.



<h2 class="wp-block-heading" id="h-magnitude-of-the-tragedy-nbsp">Magnitude of the tragedy&nbsp;</h2>



Ángel Víctor Torres, the Minister for Territorial Policy and Democratic Memory, said: “The fact that we can’t give a number of the missing persons indicates the magnitude of the tragedy.”&nbsp;



Some areas, including the Spanish town of Alfafar, are completely cut off from communication.&nbsp;



Juan Ramón Adsuara, the mayor of Alfafar, said the aid isn't nearly enough for residents trapped in an "extreme situation."



"There are people living with corpses at home. It's very sad. We are organizing ourselves, but we are running out of everything," Adsuara told reporters. "We go with vans to Valencia, we buy and we come back, but here we are totally forgotten."



<h2 class="wp-block-heading" id="h-government-warning-was-not-issued-in-time">Government warning was not issued in time</h2>



On Tuesday morning, Spain's meteorological agency Aemet warned that torrential rains were forecast for the region of Valencia, before issuing a&nbsp; "maximum red alert.”



Carlos Mazon, Valencia’s regional president, said the government sent out an SMS alert reserved for the “worst possible scenario.” But according to a report from CNN, that alert was sent hours too late.



“By 5 p.m., Valencia’s emergency services were swamped by hundreds of pleas for help throughout the region,” wrote Atika Shubert, a CNN Senior International Correspondent.



“It was at 8 p.m. that cell phones finally buzzed with the public alert telling residents to stay indoors. Much too little, much too late, even for those downstream of the raging water who might otherwise have had time to prepare.”



The BBC also noted that many people have questioned the timing of the government's warning, which arrived more than 12 hours after Aemet issued its first red alert.



<h2 class="wp-block-heading" id="h-extreme-weather-in-a-warming-climate">Extreme weather in a warming climate</h2>



The deadly floods in Valencia were primarily caused by an extreme weather event that brought record-breaking <a href="https://www.earth.com/news/extreme-rainfall-events-are-interconnected-around-the-globe/">rainfall</a>. The intense downpour was fueled by unusually warm Mediterranean Sea temperatures, which increased moisture in the atmosphere and intensified the rainfall.&nbsp;



Climate experts link this phenomenon to climate change, as warmer seas lead to more frequent, severe storms. The combination of heavy rain and the region's limited drainage capacity led to flash flooding, overwhelming local <a href="https://www.earth.com/news/predicting-floods-its-not-just-about-rainfall/">infrastructure</a>.



Rising ocean temperatures are largely driven by increased greenhouse gases that trap more heat in the atmosphere. Oceans absorb about 90% of this excess heat, leading to warmer waters, especially near the surface.&nbsp;



This warming disrupts marine ecosystems, contributing to coral bleaching and altering habitats for species like fish and marine mammals.



With the <a href="https://www.earth.com/news/can-we-outrun-the-flood-risks-of-climate-change/">climate crisis</a> intensifying, experts warn that warmer ocean temperatures will heighten the risk of rapid, destructive rainfall events.



<h2 class="wp-block-heading" id="h-second-deadliest-flood-in-europe-this-century-nbsp">Second-deadliest flood in Europe this century&nbsp;</h2>



Prime Minister Pedro Sanchez said the disaster was the second-deadliest flood in Europe this century and that Spain was carrying out its largest deployment of army and security force personnel in peacetime. The country was sending 5,000 soldiers and 5,000 police officers to the eastern region of Valencia on Saturday.



Four days after the devastating floods, rescuers are still searching for bodies. Thousands of volunteers are helping to clean up the thick mud that covers streets, homes, and businesses in the hardest-hit towns.&nbsp;



Prime Minister Sanchez responded to people who expressed they feel abandoned with no help or communication in the days following the tragic flooding.



“I am aware the response is not enough, there are problems and severe shortages… towns buried by mud, desperate people searching for their relatives.”



"For those who at this moment are still looking for their loved ones, the whole of Spain weeps with you."



According to <a href="https://www.esa.int/">ESA</a>, the Copernicus Emergency Rapid Mapping Service has been activated to provide satellite imagery that can support rescue and recovery efforts.



Image Credit: USGS, processed by ESA&nbsp;



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Valencia floods: A tragedy fueled by extreme weather

Of course, Shepard recognized that Big Bertha was an important specimen all those years ago, but it wouldn’t be until nearly half a century later that all its secrets were finally revealed. A piece of research published 48 years down the line put forth an incredible theory. Big Bertha, it seems, has an even stranger origin story than anyone could have predicted.

39. A Strange History

In the 1990s, a Japanese scientist, Shigeyuki Yamato, noticed an unusual species of shrimp swimming around in local intertidal waters. It was striking because it had unique black-and-white coloration, similar to the coat of the iconic giant panda. 



Decades later, this <a href="https://www.earth.com/news/new-deep-sea-crustacean-species-discovered-in-the-bahamas/" target="_blank" rel="noreferrer noopener">new species</a> has been officially named and introduced to science as Melita panda, the newest melitid amphipod. Its recognition highlights the importance of dedicated research and the fact that <a href="https://www.earth.com/news/marine-biodiversity-could-shift-rapidly-due-to-climate-change/" target="_blank" rel="noreferrer noopener">marine biodiversity</a> still holds many surprises for those who look carefully.



<h2 class="wp-block-heading" id="h-the-journey-of-crustacean-discovery">The journey of crustacean discovery</h2>



Before its unique coloring gave the Melita panda its name, there were already 63 recognized species of Melita <a href="https://www.earth.com/news/tiny-crustaceans-prey-on-jellyfish-to-survive-the-polar-night/" target="_blank" rel="noreferrer noopener">amphipods</a>, with 16 of them found in Japan.



Researchers Ko Tomikawa, from <a href="https://www.hiroshima-u.ac.jp/en/gshs" target="_blank" rel="noreferrer noopener">Hiroshima University's Graduate School of Humanities and Social Sciences</a>, and Hiroyuki Ariyama, from the Osaka Museum of Natural History, returned to the intertidal waters of Wakayama Prefecture where the original specimen had been found. 



There, they collected significant numbers of the black-and-white amphipods for detailed morphological and genetic analyses. These studies confirmed that the small, shrimp-like crustacean is indeed a new species.



The researchers suggest that there may be many more unidentified and undescribed species of Melita amphipods in Japan's coastal waters.



"Study on the amphipod Crustacea in the coastal zone of Japan is lagging behind," said Tomikawa. 



"In order to accurately assess species diversity, taxonomic studies are necessary. We hope the discovery of a new species of amphipod with the familiar coloring of the panda pattern will increase the public's interest in biodiversity and taxonomy."



<h2 class="wp-block-heading" id="h-melita-panda-a-tribute-to-species-taxonomy">Melita panda: A tribute to species taxonomy</h2>



In reality, our understanding of the world's species diversity, especially in marine ecosystems, is still in its infancy. Identification is an essential step in understanding the biological and conservation needs of species all over the world.



"Despite the fact that biodiversity conservation is a global issue, species diversity and other aspects of biodiversity are still not fully understood," said Tomikawa.



"As a first step toward species conservation, we conducted a taxonomic study of amphipod Crustacea, which boasts high species diversity around Japan."



<h2 class="wp-block-heading" id="h-understanding-melita-panda">Understanding Melita panda</h2>



The researchers conducted detailed morphological studies of the physical characteristics of body parts in the crustacean to ascertain their differences from other melitid amphipods. 



Unlike other familiar crustaceans, M. panda individuals are very small. The first male specimen collected was a mere 0.2 in (6 mm), with females being even smaller. 



The panda-like pattern was found to consist of black markings on a body that was white. The antennae, sides, head and posterior abdomen were all black, while the rest of the body was white.



<h2 class="wp-block-heading" id="h-distinctive-differences-in-melita-panda">Distinctive differences in Melita panda </h2>



The researchers also used nuclear and mitochondrial genes for phylogenetic analysis, hoping to gain deeper insights into the species' evolutionary relationships with other crustaceans and how it fits within the broader family tree.



Melita panda was found to be closely related to two other Melita amphipods, namely M. nagatai and M. koreana.



What clearly sets Melita panda apart from the other two species, however, are its distinctive coloring and its physical differences.



Melita panda boasts unique gnathopods - claws extending from the second thoracic segment - that are positioned more forward than in the other Melita amphipods.



It also features unique setae - bristles that look like hairs. These three species together form a monophyletic group, meaning that they share a common evolutionary ancestor, M. hoshinoi.



<h2 class="wp-block-heading" id="h-what-lies-ahead-for-crustacean-research">What lies ahead for crustacean research</h2>



As the researchers continue to study this newest Melita, they're optimistic about what lies ahead.



"Hopefully, a detailed study of the ecology and behavior of Melita panda will reveal the reason for its panda pattern," said Tomikawa. 



But, the research doesn't end with Melita panda. Tomikawa noted that further taxonomic studies on amphipods in uninvestigated areas are expected to lead to the discovery of additional new species. 



"Continued taxonomic studies are expected to elucidate the biodiversity in the coastal environments of the Japanese archipelago and provide important basic data for <a href="https://www.earth.com/news/pronghorn-lessons-conservation-crucial-preventing-species-extinctions/" target="_blank" rel="noreferrer noopener">species conservation</a>."



These discoveries remind us of just how much we have yet to learn about the biodiversity that surrounds us.



The study was published in the journal <a href="https://zookeys.pensoft.net/article/128858/" target="_blank" rel="noreferrer noopener">ZooKeys</a>.



Image Credit: Ko Tomikawa/Hiroshima University



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Meet Melita panda: The black-and-white crustacean shrimp

In the 1990s, a Japanese scientist, Shigeyuki Yamato, noticed an...

It's no secret that albatrosses are a mobile bunch. These birds don’t shy away from a little trip and, thanks to the wind, cover several hundred thousand miles to feast on fish and other creatures in the open ocean. 



Albatrosses are so attuned to the wind that some larger species have a difficult time taking off in calm weather.



<h2 class="wp-block-heading" id="h-how-much-wind-can-albatrosses-handle">How much wind can albatrosses handle?</h2>



A recent study led by the University of Liverpool’s School of Environmental Science reveals a surprising discovery: there's a limit to how much wind these <a href="https://www.earth.com/news/shrinking-sea-ice-makes-it-harder-for-seabirds-to-find-food/" target="_blank" rel="noreferrer noopener">birds</a> can handle.



The researchers found that two species of albatrosses, despite being expert fliers, found it challenging to eat during very stormy weather. Under these conditions, finding food becomes risky or even downright dangerous.



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



The experts analyzed data collected at South Georgia in the southwest Atlantic Ocean. They used tracking devices from the British Antarctic Survey to measure when and where the birds were resting, flying, or eating. 



In addition, satellite measurements of wind, rain and water clarity were used to gauge when these birds encountered stormy conditions.



Study lead author Jamie Darby conducted the research while at the <a href="https://www.liverpool.ac.uk" target="_blank" rel="noreferrer noopener">University of Liverpool</a> and is now based at <a href="https://www.ucc.ie/en/" target="_blank" rel="noreferrer noopener">University College Cork</a>. 



“This combination of data is a very powerful tool for understanding how albatrosses behave, especially when they are so difficult to observe directly," noted Darby. 



“On several occasions, we tracked wandering albatross flying in very strong storm winds. During these times, the logger data tell us that the albatrosses barely fed at all. Not only did they not manage to eat, but they also landed and took off more regularly."



<h2 class="wp-block-heading" id="h-avoiding-extreme-weather">Avoiding extreme weather</h2>



“The <a href="https://www.earth.com/news/albatrosses-use-infrasound-for-long-distance-navigation-study-reveals/" target="_blank" rel="noreferrer noopener">albatrosses</a> seem to avoid severe winds by landing on the water, but then cannot rest for long, probably because such strong wind would cause waves to break over them regularly,” said study co-author Dr. Ewan Wakefield from Durham University.



Wandering albatrosses, with the largest wingspan of any bird (up to 12 feet), are adapted for efficient flight in Southern Ocean winds.



Despite this incredible feat, they are not immune to the adverse effects of extreme weather. Recent studies have documented several instances of albatrosses avoiding the strongest wind in storm systems.



<h2 class="wp-block-heading" id="h-wind-adapted-albatrosses">Wind-adapted albatrosses </h2>



“This study allows us to understand <a href="https://www.earth.com/news/shrinking-sea-ice-makes-it-harder-for-seabirds-to-find-food/" target="_blank" rel="noreferrer noopener">animal behavior</a> when they are in places and conditions that make it almost impossible for us to see them directly. This includes extreme weather, like Southern Ocean storms," said project principal investigator Dr. Samantha Patrick.



"Knowing what animals do in these conditions, and how they cope, is really important. It’s a way to figure out how they will be affected by changes in their environment.”



The research implies that wind-adapted albatrosses could be disadvantaged by more widespread extreme winds, as finding food becomes difficult or dangerous.



<h2 class="wp-block-heading" id="h-implications-for-conservation">Implications for conservation</h2>



The findings from this study hold important implications for the conservation of albatrosses, as climate change is predicted to increase the frequency and intensity of extreme weather events.



Understanding how these birds respond to such conditions is crucial for developing strategies to protect them. Conservationists can use this knowledge to inform marine protected area design and enforce policies that mitigate human impact on albatross habitats. 



By anticipating how future wind patterns might hinder their ability to feed, conservation efforts can be tailored to support the resilience of these magnificent creatures.



<h2 class="wp-block-heading" id="h-wind-s-impact-on-albatrosses">Wind's impact on albatrosses</h2>



This study opens the door for further research into the behavioral adaptations of albatrosses and other seabirds to extreme weather conditions.



As technology advances, more sophisticated tracking devices and environmental sensors will allow researchers to gather even finer-scale data on <a href="https://www.earth.com/news/seabirds-have-highly-sensitive-beaks-to-locate-food/" target="_blank" rel="noreferrer noopener">bird movements</a> and environmental conditions. 



Future studies could explore how juvenile albatrosses learn to navigate and respond to stormy weather or how changes in prey availability during storms impact albatross feeding strategies. 



Such research can deepen our understanding of how winds and climate change affect not only albatrosses but marine ecosystems as a whole.



The study was funded by the Natural Environmental Research Council (NERC) in the UK and the National Science Foundation (NSF) in the U.S.



The findings are published in the journal <a href="https://www.cell.com/current-biology/fulltext/S0960-9822(24)01372-1" target="_blank" rel="noreferrer noopener">Current Biology</a>.



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Strong winds make it difficult for albatrosses to feed

It's no secret that albatrosses are a mobile bunch. These...

COVID-19 presents a broad range of symptoms, varying in intensity from mild to severe and even life-threatening, especially among those with pre-existing health conditions. Despite current strains generally producing milder symptoms, individuals with underlying conditions still face heightened risks of severe illness. 



Now, researchers at <a href="https://www.emory.edu/home/index.html" target="_blank" rel="noreferrer noopener">Emory University</a> have made a breakthrough in predicting <a href="https://www.earth.com/news/air-pollution-can-increase-the-severity-of-covid-19-infection/" target="_blank" rel="noreferrer noopener">COVID-19 severity</a> by analyzing autoantibodies in the nasal cavity. 



The findings, published in the journal <a href="https://doi.org/10.1126/scitranslmed.adq1789" target="_blank" rel="noreferrer noopener">Science Translational Medicine</a>, offer a path to more tailored treatment plans that could benefit high-risk individuals by informing rapid treatment options, such as taking antiviral medications like Paxlovid within a week of symptom onset to reduce the risk of severe complications.



<h2 class="wp-block-heading" id="h-tracking-covid-19-through-antibodies">Tracking COVID-19 through antibodies</h2>



The study monitored 125 patients with COVID-19 ranging from mild to severe cases over nearly two years. The researchers tracked <a href="https://www.earth.com/news/antibodies-improve-in-quality-for-months-after-covid-19-vaccination/" target="_blank" rel="noreferrer noopener">antibodies</a> both in the blood and in the nasal airways and found that over 70% of individuals with mild or moderate COVID-19 developed specific autoantibodies in the nasal cavity. 



Surprisingly, these nasal autoantibodies were associated with milder symptoms, better antiviral responses, and quicker recovery times.



According to the study’s lead researcher, Eliver Ghosn, a faculty member at Emory’s Lowance Center for Human Immunology and Emory Vaccine Center, the presence of these autoantibodies in the nose appears to play a protective role by regulating the <a href="https://www.earth.com/news/how-do-deadly-molds-attack-the-immune-system-of-humans/" target="_blank" rel="noreferrer noopener">immune system</a>. 



“Generally, autoantibodies are associated with pathology and a negative prognosis, causing increased <a href="https://www.earth.com/news/long-covid-inflammation-damages-heart-cells/" target="_blank" rel="noreferrer noopener">inflammation</a> that would indicate more severe disease,” Ghosn said. “What’s interesting about our findings is that with COVID-19, it’s the opposite.”



<h2 class="wp-block-heading" id="h-distinct-immune-pathway">Distinct immune pathway</h2>



These nasal autoantibodies seem to latch onto inflammatory molecules produced by the patient’s own cells early in infection, potentially preventing excessive inflammation.&nbsp;



The autoantibodies then diminish as recovery progresses, suggesting they serve as an immune response mechanism to keep the inflammatory process balanced.&nbsp;



This nasal response, in contrast to autoantibodies in the blood, could mark a distinct immune pathway that guards against severe disease.



<h2 class="wp-block-heading" id="h-immune-responses-in-the-nasal-cavity-nbsp">Immune responses in the nasal cavity&nbsp;</h2>



Earlier studies showed that autoantibodies in the blood often predispose COVID-19 patients to severe illness. However, these studies have largely overlooked the nasal cavity, which is the actual entry and initial infection site for the virus.&nbsp;



This new study reveals that immune responses in the nasal cavity may function differently, with nasal autoantibodies potentially offering a layer of protection, unlike those found in the blood.



“The key to this puzzle was to look directly at the site of infection, in the nose, instead of the blood,” Ghosn explained.&nbsp;



“While autoantibodies in the blood were linked to bad prognosis, producing them only in the nose soon after infection is linked to efficient recovery.” This distinction underscores the potential for site-specific immune responses in respiratory illnesses.



<h2 class="wp-block-heading" id="h-new-tool-to-detect-local-antibodies">New tool to detect local antibodies</h2>



To analyze antibodies produced at the infection site in the nose, the Ghosn lab developed a new diagnostic tool called FlowBEAT.&nbsp;



This biotechnology allows for a more efficient, comprehensive measurement of antibodies in nasal swabs, which could soon have applications for other respiratory illnesses like <a href="https://www.earth.com/news/how-does-the-influenza-virus-hack-our-cells/" target="_blank" rel="noreferrer noopener">influenza</a> and RSV. 



Unlike traditional tests, which generally measure only a single antibody type, FlowBEAT can evaluate all human antibody types against dozens of viral and host antigens in one test.



“Historically, the technology to measure antibodies has low sensitivity and is inefficient since they are limited to measuring one or a few antibodies at a time,” Ghosn explained.&nbsp;



“With FlowBEAT, we can take any standard nasal swab and perform a combination test to simultaneously measure all human antibody types against dozens of viral and host antigens in a single tube.”&nbsp;



This new technology enables a more sensitive and scalable way to measure nasal autoantibodies, providing valuable insights into infection severity and improving diagnostic capabilities.



<h2 class="wp-block-heading" id="h-combating-respiratory-infections-more-effectively-nbsp">Combating respiratory infections more effectively&nbsp;</h2>



The study also opens the door to examining whether this nasal autoantibody response is a common immune defense mechanism in other respiratory infections.&nbsp;



If similar responses are identified in cases of flu or RSV, this could represent a new understanding of how the body mounts protective immunity against a range of viral infections.



“If this nasal autoantibody response turns out to be a common mechanism to protect us against other viral infections, it can be a paradigm shift in how we study protective immunity,” Ghosn said.&nbsp;



He envisions this discovery sparking new research avenues and therapeutic strategies for combating respiratory infections more effectively.



<h2 class="wp-block-heading" id="h-more-precise-treatment-decisions-nbsp">More precise treatment decisions&nbsp;</h2>



Following the findings, Ghosn’s team is collaborating with Emory’s patent office to create a diagnostic tool that uses leftover samples from routine nasal swabs taken for COVID-19 tests.&nbsp;



Such a tool could help healthcare providers assess patients’ immune responses in real time, enabling timely, more precise treatment decisions.



Ben Babcock, a PhD candidate who led the study, emphasized the significance of real-time immune monitoring.



“Imagine if we could capture the immune response in real-time, right in the clinic. A just-in-time test could give physicians and patients the real-time information they need to make faster, smarter treatment decisions,” said Babcock.



If successful, this tool could redefine how respiratory infections are managed in clinical settings, providing patients and healthcare providers with more control over treatment timelines.



<h2 class="wp-block-heading" id="h-personalized-treatment-for-respiratory-infections-nbsp">Personalized treatment for respiratory infections&nbsp;</h2>



The potential for nasal autoantibodies to influence treatment strategies represents an important step toward personalized respiratory care.&nbsp;



As Ghosn notes, this discovery challenges traditional perspectives on autoantibodies and offers a promising pathway for real-time diagnosis and treatment options not only for COVID-19 but also for other respiratory infections.&nbsp;



With further development and clinical testing, FlowBEAT and similar technologies could make it possible to accurately predict disease progression and severity, giving patients a better chance of recovery with minimal complications.



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Nasal swab test can predict severe COVID-19 infections

COVID-19 presents a broad range of symptoms, varying in intensity...

A team of biologists has recently revealed the origins of a unique DNA duplication mechanism that grants plants additional ways to control genetic instructions.&nbsp;



This discovery, led by Xuehua Zhong from the <a href="https://washu.edu/" target="_blank" rel="noreferrer noopener">Washington University in St. Louis</a> (WashU), holds promise for innovations in agriculture, particularly in enhancing crop resilience to environmental challenges like heat and <a href="https://www.earth.com/news/droughts-and-extreme-weather-events-are-escalating/" target="_blank" rel="noreferrer noopener">drought</a>. 



The research, published in the journal <a href="http://dx.doi.org/10.1126/sciadv.adr2222" target="_blank" rel="noreferrer noopener">Science Advances</a>, delves into DNA methylation - a biological process that plays a key role in gene regulation, directly impacting how <a href="https://www.earth.com/news/how-do-plants-make-life-and-death-decisions/" target="_blank" rel="noreferrer noopener">plants</a> respond to environmental stressors.



<h2 class="wp-block-heading" id="h-complexity-of-plant-dna-methylation">Complexity of plant DNA methylation</h2>



DNA methylation involves adding small chemical groups called methyl groups to DNA. This modification determines which genes are turned on or off, shaping various plant traits.&nbsp;



A crucial part of this process involves silencing “<a href="https://www.earth.com/news/a-fungus-has-become-more-deadly-thanks-to-jumping-genes/" target="_blank" rel="noreferrer noopener">jumping genes</a>” or transposons, which are mobile DNA sequences that can disrupt normal genetic function if not controlled. In plants, this regulatory role is handled by specialized enzymes, distinct from those found in mammals.



“Mammals only have two major enzymes that add methyl groups in one DNA context, but plants actually have multiple enzymes that do that in three DNA contexts,” Zhong explained, highlighting the unique complexity of plant DNA methylation.&nbsp;



“The question is - why do plants need extra methylation enzymes?” This research could pave the way for advancements in agriculture by helping scientists to tap into plant systems that naturally regulate resilience-related traits.



<h2 class="wp-block-heading" id="h-the-role-of-enzymes-in-plant-dna">The role of enzymes in plant DNA</h2>



Zhong’s study focuses on two enzymes unique to plants: CMT3 and CMT2. Both enzymes are part of the chromomethylase (CMT) family, responsible for adding methyl groups to specific DNA sequences.&nbsp;



CMT3 specializes in methylating so-called CHG sequences, while CMT2 targets CHH sequences. Despite their differences, these enzymes share a common ancestry, having evolved through duplication events that provided plants with extra copies of genetic information.



<h2 class="wp-block-heading" id="h-evolutionary-history-of-the-enzymes-nbsp">Evolutionary history of the enzymes&nbsp;</h2>



Using the model plant Arabidopsis thaliana, also known as thale cress, Zhong’s team traced the evolutionary history of these enzymes.&nbsp;



The experts discovered that CMT2 lost its ability to methylate CHG sequences due to the absence of an amino acid called arginine, a change that occurred during the enzyme’s evolution.&nbsp;



“Arginine is special because it has charge. In a cell, it’s positively charged and thus can form hydrogen bonds or other chemical interactions with, for example, the negatively charged DNA,” explained co-author Jia Gwee, a graduate student at WashU.



CMT2, however, contains valine instead of arginine. Valine lacks the necessary charge to interact with CHG sequences, explaining why CMT2 no longer recognizes these DNA contexts as CMT3 does.&nbsp;



To test this theory, the research team introduced arginine back into CMT2, restoring its ability to methylate both CHG and CHH sequences.&nbsp;



This mutation suggests that CMT2 originally functioned as a duplicate of CMT3 - a backup enzyme with the potential to diversify its function as plant DNA complexity grew.&nbsp;



“But instead of simply copying the original function, it developed something new,” Zhong noted.



<h2 class="wp-block-heading" id="h-adapting-to-environmental-stress">Adapting to environmental stress</h2>



The study also uncovered structural features that set CMT2 apart. Notably, the enzyme has a flexible N-terminal region that influences its protein stability, a characteristic that may have helped plants adapt to various environmental conditions.&nbsp;



“This is one of the ways plants evolved for genome stability and to fight environmental stresses,” Zhong explained. This structural adaptation has likely allowed plants equipped with CMT2 to thrive in diverse climates across the globe.



A significant portion of the data for this study came from the <a href="https://1001genomes.org/" target="_blank" rel="noreferrer noopener">1001 Genomes Project</a>, which maps the genetic diversity of A. thaliana strains worldwide. 



By exploring samples from plants in the wild rather than just laboratory specimens, the researchers gained insights into how DNA methylation contributes to plants’ natural <a href="https://www.earth.com/news/arctic-ecosystem-stability-threatened-by-declining-plant-resilience/" target="_blank" rel="noreferrer noopener">resilience</a>.



<h2 class="wp-block-heading" id="h-jumping-genes-and-plant-adaptation">Jumping genes and plant adaptation</h2>



The study also highlights the adaptive potential of transposons, or “jumping genes,” in plant DNA. These mobile sequences are often silenced by methylation to maintain genomic stability, but their occasional movement can aid in environmental adaptation.&nbsp;



“One jump might help species deal with harsh environmental conditions,” Zhong said, explaining how these genetic shifts could help plants survive in challenging environments.



As plants navigate unpredictable climates, the diversification enabled by DNA methylation - particularly through enzymes like CMT3 and CMT2 - can provide the flexibility needed to withstand stressors like extreme temperatures and limited water availability.



<h2 class="wp-block-heading" id="h-future-implications-for-crop-resilience">Future implications for crop resilience</h2>



Understanding how CMT enzymes contribute to plant resilience opens exciting possibilities for agriculture.&nbsp;



By precisely targeting the genes and methylation processes responsible for drought tolerance, heat resistance, or other resilience traits, scientists could enhance crops’ ability to thrive under changing climate conditions.&nbsp;



“If we find precisely how they are regulated, then we can find a way to innovate our technology for crop improvement,” Zhong explained.



As the world faces growing agricultural challenges, insights into the DNA methylation processes that strengthen plants can provide a foundation for developing crops capable of withstanding increasingly severe environmental pressures.&nbsp;



This research marks a step forward in harnessing plants’ genetic systems to create resilient agricultural ecosystems, offering a promising path to sustainable <a href="https://www.earth.com/news/fungal-infections-are-threatening-global-food-security/" target="_blank" rel="noreferrer noopener">food security</a> in the face of climate change.



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Plants use DNA duplication to increase their resilience 

A team of biologists has recently revealed the origins of...

The fossilized remains of a giant "terror bird," recently discovered in the sandy landscapes of South America's Tatacoa Desert, tells the story of a formidable predator from the Phorusrhacid family.



A new study focuses on these giant, meat-eating predators, providing remarkable insights into the diverse wildlife that roamed the world in very ancient times.



<h2 class="wp-block-heading" id="h-what-are-phorusrhacid-s">What are Phorusrhacids?</h2>



Phorusrhacid birds, better known as "terror birds," were some of the most impressive predators to ever walk the Earth. These flightless birds lived in South America from about 60 million to 2 million years ago. 



Standing up to 10 feet tall, they had massive, hooked beaks and really strong legs built for running, Basically, they were the top predators of their time.



Terror birds dominated their environment by hunting small to medium-sized animals. They could sprint at high speeds to chase down prey, using their powerful beaks to deliver lethal strikes. 



Some scientists believe they might have even hunted in packs, although that's still up for debate. Their reign lasted for millions of years, filling the gap left by the dinosaurs' extinction.



<h2 class="wp-block-heading" id="h-leg-bone-of-an-ancient-phorusrhacid">Leg bone of an ancient Phorusrhacid</h2>



At the center of this fascinating narrative is a leg bone. This relic from the <a href="https://www.earth.com/news/fossil-site-in-australia-indicates-abundant-life-during-the-miocene/" target="_blank" rel="noreferrer noopener">Miocene</a> epoch, a period dating back around 12 million years, holds within it stories about the ancient birds of prey that roamed the continent.



Dr. Siobhán Cooke is an associate professor of functional anatomy and evolution at the <a href="https://www.jhu.edu/" target="_blank" rel="noreferrer noopener">Johns Hopkins University</a> School of Medicine. 



He noted that the size of the bone indicates that this terror bird may be the largest known member of the species identified to date, approximately 5 to 20 percent larger than known Phorusrhacids.



The bone's physical attributes provide an intriguing subplot. It contains deep pits peculiar to Phorusrhacids and potential teeth marks of a prehistoric caiman, Purussaurus.



The physical evidence seems to point to a fatal altercation with a <a href="https://www.earth.com/news/differences-in-the-mammalian-and-reptilian-brain-revealed/" target="_blank" rel="noreferrer noopener">reptilian</a> adversary. 



"We suspect that the terror bird would have died as a result of its injuries given the size of <a href="https://www.earth.com/news/ancient-remains-shed-new-light-on-crocodilian-evolution/" target="_blank" rel="noreferrer noopener">crocodilians</a> 12 million years ago," said Dr. Cooke.



<h2 class="wp-block-heading" id="h-distribution-of-phorusrhacid-terror-birds">Distribution of Phorusrhacid terror birds</h2>



The unearthed fossil, found as far north as Colombia, expands our understanding of the geography of terror birds, which have been primarily associated with Argentina and Uruguay.



The research hints at a diverse and thriving ecosystem, markedly different from the landscapes we see now.



This ancient environment, now a desert, was home to <a href="https://www.earth.com/news/primates-face-an-uncertain-future-due-to-climate-change/" target="_blank" rel="noreferrer noopener">primates</a>, hoofed mammals, gigantic ground sloths, glyptodonts (essentially, gigantic armadillos the size of cars), and terror birds.



The seriema, a modern long-legged bird native to South America, is considered a distant relative of Phorusrhacids.



"It’s a different kind of ecosystem than we see today or in other parts of the world during a period before South and North America were connected," noted Dr. Cooke.



<h2 class="wp-block-heading" id="h-studying-phorusrhacid-terror-birds">Studying Phorusrhacid terror birds</h2>



The discovery opens a window of possibility that additional fossils of terror birds may lie unidentified in museum archives.



"It’s possible there are fossils in existing collections that haven’t been recognized yet as terror birds because the bones are less diagnostic than the lower leg bone we found," said Dr. Cooke.



The fossil also prompts us to envision an environment now lost to time, populated by <a href="https://www.earth.com/news/elusive-bird-night-parrot-pezoporus-occidentalis-thought-to-be-long-extinct-rediscovered/" target="_blank" rel="noreferrer noopener">long-extinct</a> creatures that once dominated the fauna. 



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/terror-bird_Phorusrhacid_leg-bone_tibiotarsus_credit-Degrange_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/terror-bird_Phorusrhacid_leg-bone_tibiotarsus_credit-Degrange_1s.webp" alt="The end of a terror bird's left tibiotarsus, a lower leg bone in birds equivalent to that of a human tibia or shin bone, dates back to the Miocene epoch around 12 million years ago. Credit: Degrange et al." class="wp-image-1949728"/></a><figcaption class="wp-element-caption">The end of a terror bird's left tibiotarsus, a lower leg bone in birds equivalent to that of a human tibia or shin bone, dates back to the Miocene epoch around 12 million years ago. Credit: Degrange et al.</figcaption></figure>



"It would have been a fascinating place to walk around and see all of these now extinct animals," noted Dr. Cooke.



This remarkable find, the first of its kind from the site, is a tribute to the rich biodiversity that once adorned our planet. 



It nudges us to view the past through a lens of awe and curiosity, and to appreciate the diversity and beauty of the life forms that populated Earth millions of years ago.



<h2 class="wp-block-heading" id="h-the-terror-bird-s-legacy">The terror bird’s legacy</h2>



The discovery of this massive terror bird sheds light not only on ancient ecosystems but also on the evolutionary story of apex predators. 



The physical characteristics of this bird - its powerful leg bones and sharp beak -- highlight the specialized adaptations that allowed it to thrive in its environment.



These adaptations may have provided the terror bird with the speed and agility to hunt effectively, filling a predatory role in the food chain much like large cats or raptors do today. 



By understanding the terror bird’s evolution, researchers hope to uncover insights into how apex predators adapt to environmental shifts, contributing valuable knowledge to evolutionary biology.



<h2 class="wp-block-heading" id="h-fossil-discoveries-on-the-horizon">Fossil discoveries on the horizon</h2>



This fossil, potentially one of the largest known of its kind, also serves as a reminder that more discoveries await in the Tatacoa Desert and beyond.



While Colombia is not typically recognized as a hotbed of fossil discovery compared to regions like Argentina or North America, recent findings like this highlight its hidden potential.



Paleontologists are hopeful that ongoing exploration of South American sites will yield further specimens, expanding our understanding of Miocene-era ecosystems. 



This research, along with improved fossil identification techniques, may pave the way for unearthing additional terror bird remains, helping scientists reconstruct the behaviors, habitats, and interactions of these ancient predators.



The study is published in the journal <a href="https://onlinelibrary.wiley.com/doi/epdf/10.1002/spp2.1601" target="_blank" rel="noreferrer noopener">Palaeontology</a>.



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New "terror bird" species ate meat and dominated the planet

The fossilized remains of a giant "terror bird," recently discovered...

Just when you thought you'd heard it all about the benefits of exercise, a study emerges that further endorses the power of physical activity.



The research suggests that adding just a short burst of physical activity - such as uphill walking or climbing stairs - into your daily schedule might just be the secret elixir to reducing your blood pressure.



<h2 class="wp-block-heading" id="h-physical-activity-and-blood-pressure">Physical activity and blood pressure </h2>



The study was conducted by a team of experts from the ProPASS (Prospective Physical Activity, Sitting and Sleep) Consortium, steered by the University of Sydney and University College London (UCL).



The findings offer a fresh perspective on how we could potentially manage blood pressure <a href="https://www.earth.com/news/study-reveals-over-2000-genetic-markers-that-affect-blood-pressure/" target="_blank" rel="noreferrer noopener">issues</a>.



The study revealed that as little as five minutes of moderate activity daily could potentially help reduce blood pressure levels. 



The researchers also found that replacing about 20-27 minutes of sedentary time with exercise such as walking, running, and cycling could also play a significant role in reducing blood pressure.



<h2 class="wp-block-heading" id="h-adding-exercise-to-daily-life">Adding exercise to daily life</h2>



“High blood pressure is one of the biggest health issues globally, but unlike some major causes of cardiovascular mortality there may be relatively accessible ways to tackle the problem in addition to medication,” said joint senior author&nbsp;Professor Emmanuel Stamatakis,&nbsp;director of the ProPASS Consortium from the&nbsp;<a href="https://www.sydney.edu.au/charles-perkins-centre/" target="_blank" rel="noreferrer noopener">Charles Perkins Centre</a>.&nbsp;



“The finding that doing as little as five extra minutes of exercise per day could be associated with measurably lower blood pressure readings emphasises how powerful short bouts of higher intensity movement could be for <a href="https://www.earth.com/news/drinking-from-plastic-bottles-raises-your-blood-pressure/" target="_blank" rel="noreferrer noopener">blood pressure management</a>.”&nbsp;



<h2 class="wp-block-heading" id="h-managing-blood-pressure-levels">Managing blood pressure levels</h2>



Hypertension, or consistently elevated blood pressure, remains one of the primary causes of premature death worldwide.



With nearly 1.28 billion adults affected globally, hypertension can lead to devastating health implications such as stroke, heart attack, heart failure, and kidney damage.



Often tagged as the "silent killer" due to the absence of visible symptoms, managing blood pressure levels evidently demands our urgent attention.



<h2 class="wp-block-heading" id="h-blood-pressure-after-exercise">Blood pressure after exercise</h2>



The research team analyzed health information from 14,761 volunteers across five countries. They aimed to examine how swapping one type of movement behavior with another over the day could influence <a href="https://www.earth.com/news/sleeping-less-than-seven-hours-high-blood-pressure-risk/" target="_blank" rel="noreferrer noopener">blood pressure</a> levels.



To ensure accuracy, each participant used a wearable accelerometer device on their thigh. This device kept track of their activity levels and blood pressure throughout day and night. 



The team divided daily activity into six distinct categories: sleep, sedentary behavior (such as sitting), slow walking, fast walking, standing, and more vigorous exercise such as running, cycling or stair climbing.



<h2 class="wp-block-heading" id="h-every-step-counts">Every step counts</h2>



Based on the data, the team realized that switching sedentary behavior with 20-27 minutes of physical activity daily could potentially slash the risk of cardiovascular disease by as much as 28 percent at a population level.



“Our findings suggest that, for most people, exercise is key to reducing blood pressure, rather than less strenuous forms of movement such as walking," said first author&nbsp;Dr. Jo Blodgett&nbsp;from the&nbsp;<a href="https://www.ucl.ac.uk/surgery/" target="_blank" rel="noreferrer noopener">Division of Surgery and Interventional Science</a>&nbsp;at UCL and the&nbsp;<a href="https://www.iseh.co.uk/" target="_blank" rel="noreferrer noopener">Institute of Sport, Exercise and Health</a>.



“The good news is that whatever your physical ability, it doesn’t take long to have a positive effect on blood pressure. What’s unique about our exercise variable is that it includes all exercise-like activities, from running for a bus or a short cycling errand, many of which can be integrated into daily routines."



Dr. Blodgett noted that for those who don’t do a lot of exercise, walking still had some positive benefits for blood pressure. "But if you want to change your blood pressure, putting more demand on the cardiovascular system through exercise will have the greatest effect.”&nbsp;



<h2 class="wp-block-heading" id="h-implications-for-daily-life">Implications for daily life</h2>



Integrating physical activity into one's routine does not have to be a daunting task. This study highlights that even minor modifications to daily habits can foster meaningful health improvements.



For instance, opting for the stairs instead of the elevator or a brisk walk during lunch breaks can accumulate significant health benefits over time. 



Such changes are not only practical but provide an accessible and engaging approach to managing health, promoting a proactive stance toward reducing hypertension risks. 



<h2 class="wp-block-heading" id="h-managing-blood-pressure-with-exercise">Managing blood pressure with exercise</h2>



The implications of this research extend beyond individual action, hinting at a potential shift in public <a href="https://www.earth.com/news/high-blood-pressure-can-be-detected-in-voice-recordings/" target="_blank" rel="noreferrer noopener">health strategies</a>. 



Encouraging urban planning that incorporates more walkable spaces, investing in community fitness programs, and raising public awareness about the benefits of integrating activity into daily life could positively influence public health.



Policymakers may consider these findings as a call to implement initiatives that promote environments conducive to physical activity. 



Such measures align not only with health benefits but also with sustainability goals, fostering healthier lifestyles in conjunction with environmental stewardship.



The key takeaway? Incorporating more physically demanding activities in your daily life can have the greatest effect on your blood pressure. It doesn’t matter if you are running for a bus or cycling to the nearby grocery store - every bit of effort counts.



The study is published in the journal <a href="https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.124.069820" target="_blank" rel="noreferrer noopener">Circulation</a>.



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Just 5 minutes of daily exercise can lower blood pressure

Just when you thought you'd heard it all about the...

Modern ecologists now have more data than ever to help monitor biodiversity, yet this increase in data isn’t always enough to address the nuanced challenges species face.&nbsp;



As global biodiversity declines, animal ecologist Scott Yanco from the <a href="https://umich.edu/" target="_blank" rel="noreferrer noopener">University of Michigan</a> explains that more specific data is crucial to identify the causes behind population declines, which, left unchecked, could lead to <a href="https://www.earth.com/news/local-species-extinctions-are-often-underestimated/" target="_blank" rel="noreferrer noopener">species extinction</a>. 



In a recent study co-authored with U-M evolutionary ecologist Brian Weeks and an international team, Yanco highlights the growing role of animal tracking <a href="https://www.earth.com/news/nasa-is-tracking-endangered-animal-habitats-from-space/" target="_blank" rel="noreferrer noopener">technology</a> in revolutionizing conservation efforts.



<h2 class="wp-block-heading" id="h-the-vital-role-of-biodiversity">The vital role of biodiversity</h2>



Biodiversity is essential for supporting human health and ecosystems. It underpins food, water, air quality, and recreation.&nbsp;



Biodiversity isn’t only vital in remote ecosystems like tropical rainforests; Yanco points out that local biodiversity, such as what’s found in our backyards, plays a key role too. Understanding <a href="https://www.earth.com/news/what-are-the-biggest-drivers-of-biodiversity-loss/" target="_blank" rel="noreferrer noopener">biodiversity</a> is essential for developing effective policies. 



Protecting ecosystems helps prevent crises like pandemics and agricultural failures, which ultimately support human well-being. Yanco’s work focuses on applying data to anticipate and prevent these issues.



<h2 class="wp-block-heading" id="h-the-evolution-of-animal-tracking">The evolution of animal tracking</h2>



Tracking animals is not a new practice in ecology. Traditionally, animals were fitted with simple markers, such as aluminum leg bands for birds or collars for mammals.&nbsp;



However, these methods required researchers to repeatedly locate the animals, which was often challenging and time-consuming. This limited the amount of detailed, continuous data available on individual animals.



In recent years, electronic tracking devices have provided more precise information, similar to the GPS technology found in smartphones.&nbsp;



These new tracking devices allow researchers to monitor the location and behavior of animals on a much larger scale and over extended periods.&nbsp;



This influx of data has revealed previously unknown details about animals’ movements and interactions with their environments, creating an opportunity to study the behaviors and environmental factors that drive population declines.



<h2 class="wp-block-heading" id="h-animal-tracking-data-and-conservation">Animal tracking data and conservation</h2>



Animal tracking technology provides insights that go beyond monitoring population numbers. While researchers can often track overall trends in population levels, they need more specific information to determine the exact causes behind these changes.&nbsp;



Detailed data from animal tracking can help scientists understand the precise impact of <a href="https://www.earth.com/news/scientists-climate-change-and-biodiversity-loss-are-one-indivisible-global-health-crisis/" target="_blank" rel="noreferrer noopener">climate change</a>, pollution, habitat fragmentation, and other stressors. This level of detail is essential for developing targeted conservation interventions.



With precise tracking data, conservationists can move beyond general explanations and address specific challenges.&nbsp;



For example, rather than simply noting habitat loss as a cause of population decline, tracking data can help researchers pinpoint particular areas where fragmented habitats are directly impacting survival rates.&nbsp;



By identifying these localized issues, ecologists can design interventions that address the specific conditions that impact wildlife populations.



Tracking technology offers a unique opportunity to gather such detailed information, which is especially valuable in studying species that are difficult to observe in the wild.&nbsp;



With this data, scientists can examine biodiversity on a global scale, focusing on species that are particularly vulnerable to human impacts.



<h2 class="wp-block-heading" id="h-emerging-animal-tracking-technologies">Emerging animal tracking technologies</h2>



Modern animal tracking technology now includes lightweight GPS devices, which provide precise location data for larger animals like elk or elephants.&nbsp;



For smaller animals, researchers use miniaturized tracking devices that store data for later retrieval, as these species cannot support the weight of GPS-enabled devices.&nbsp;



Systems such as ICARUS are developing smaller, satellite-based tags, which enable researchers to track smaller species without needing to recapture the animals.



Advanced tracking devices also include additional sensors that measure environmental factors like temperature, humidity, and air pressure. Some devices even include mortality switches that send alerts if the animal has been motionless for too long.&nbsp;



This innovation allows researchers to understand animal behavior and responses to environmental changes with high precision.



With these technologies, researchers can collect detailed information about animal movements, behavior, and survival conditions.&nbsp;



This data provides new insights into the causes behind biodiversity declines, giving ecologists valuable tools for addressing these challenges.



<h2 class="wp-block-heading" id="h-building-a-targeted-approach-to-conservation">Building a targeted approach to conservation</h2>



Yanco sees these developments as paving the way for more targeted conservation strategies. By pinpointing the causes behind population declines, tracking technology enables conservationists to develop interventions that address specific threats to individual species.&nbsp;



This precise approach allows researchers to recommend specific actions that help wildlife populations thrive while minimizing human impact, creating potential for sustainable, coexisting ecosystems.



With this influx of detailed tracking data, Yanco and his team are hopeful for a future where <a href="https://www.earth.com/news/effective-conservation-efforts-key-to-saving-biodiversity/" target="_blank" rel="noreferrer noopener">conservation efforts</a> are more informed and effective. 



As tracking technology continues to evolve, ecologists are better equipped to combat the challenges facing biodiversity worldwide, with data-driven insights shaping the path forward.



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Animal tracking is crucial for preserving biodiversity

Modern ecologists now have more data than ever to help...

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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

[sendtonews key="0ynNMYkMKa-2340414-12187" 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> (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...

One Big Rock This particular piece of space rock was officially called 14321, but it is more commonly known as Big Bertha. And we can see just how it picked up this moniker if we consider its size. The stone was much larger than any other collected during this mission – weighing in at almost 20 pounds.

40. One Big Rock