Articles tagged with Aquatic Animals
A study published in the Journal of Experimental Biology found that manatees can probably hear which directions boats approach from. The animals were able to pinpoint sound sources, including both high- and low-pitched sounds, using a combination of time difference and intensity cues.
Researchers found that interglacial warming resulted in dramatic changes to the diets of animal groups, with some becoming mixed feeders that grazed on grasses. The study highlights the importance of the fossil record in understanding long-term ecological responses to climate change.
Historians from Census of Marine Life reconstructed ocean life in olden days, revealing past sea life was teeming with over 27,000 southern right whales around New Zealand. The findings are causing authorities to revisit marine baselines and provide a new context for contemporary ocean management.
Researchers at Scripps Institution of Oceanography describe a direct comparison between sperm whale clicking sounds and its physical features, including size and internal organ structure. The study provides a glimpse into a possible new approach for investigating the biology behind marine mammal sounds.
A study found high concentrations of pollutants in marine mammals' brains, including pesticides like DDTs and PCBs, as well as brominated flame retardants. The results have significant implications for the health of marine mammals, particularly their hearing and cognitive development.
Researchers will build an underwater virtual reality 'holodeck' to study cephalopod camouflage, measuring light fields and behavior in different environments. The goal is to understand the nature of their vision, color perception, and skin optical properties.
Researchers have documented the first known migration of blue whales from California to British Columbia and the Gulf of Alaska since commercial whaling ended in 1965. The whales' return suggests a re-establishment of historical migration patterns, possibly driven by changes in ocean conditions.
Basking sharks, the world's second-largest fish, migrate through tropical waters of the Atlantic Ocean during winter, defying previous notions of their habitat. This discovery highlights the need for coordinated conservation efforts to protect this threatened species.
Researchers tested two dolphins' cognitive performance after 5 days of continuous auditory vigilance, finding no signs of sleep deprivation. The dolphins remained alert and responsive to both sound and visual stimuli throughout the 120-hour experiment, with their blood showing no physical signs of fatigue.
Researchers at Duke University unify biological and geophysical principles of nature's design using the constructal law, which predicts flow systems' evolution to balance imperfections. This new perspective offers a powerful tool for understanding variation in both animate and inanimate nature.
Researchers from Carnegie Museum of Natural History and Canadian Museum of Nature discovered a carnivorous animal fossil, Puijila darwini, which is believed to be the 'missing link' between seals, sea lions, and walruses. The fossil provides evidence that pinnipeds went through a freshwater phase in their evolution.
Researchers at Uppsala University and colleagues analyze fossil upper arm bones from ancient vertebrates, revealing two distinct life histories. Ichthyostega, a more terrestrial animal, undergoes significant changes in limb shape and muscle attachments as it grows, while Acanthostega remains aquatic with less dramatic transformations.
A recent study published in Science found that Ichthyostega, a four-limbed animal with backbones, may have been the more primitive form, acquired terrestrial habits later in development. In contrast, Acanthostega's limbs showed more similarities to earlier fish fins, indicating it may have returned to an aquatic lifestyle.
Calculations suggest low-oxygen dead zones in the ocean will expand significantly over the next century. Marine animals will need more oxygen to survive as carbon dioxide levels increase, exacerbating the effects of 'dead zones'.
A new study by researchers from the University of Melbourne and others has found that all octopuses possess venomous capabilities, with a common ancient ancestor producing specialized proteins. The team's findings also highlight the importance of cephalopod venoms in drug development for conditions such as pain management and allergies.
A comprehensive study resolves decades-long debates on early animal relationships, revealing that sponges and comb jellies share a common group with bilaterians. The research also sheds light on the evolution of nervous systems, suggesting they developed only once in animal history.
Fossil fragments of Hurdia victoria reveal a 500-million-year-old predator with a unique body structure, including a massive three-part carapace and intricate gills. The discovery sheds light on the evolution of key features in modern arthropods.
A North Atlantic right whale was administered a sedation mixture, allowing rescuers to remove 90% of the entangling gear. The new sedation delivery system enabled the team to successfully free the animal in two days, improving the chances of its survival.
Researchers discovered that a deep-sea fish's tubular eyes can rotate within a transparent shield, allowing it to peer up at prey or focus forward to see its surroundings. This unique adaptation enables the 'barreleye' fish to capture small prey and navigate through the dark environment.
Research on seamounts reveals that many animals are not exclusive to these underwater mountains and can be found in other deep-sea areas. The study identifies distinctive groups of corals and sponges, as well as sea cucumbers, which are rare or absent on other seafloor areas.
Researchers have recorded the earliest evidence of animal life using Hydropyrolysis technology, dating fossil steroids 635-750 million years old. This discovery suggests that simple multicellular animals existed in shallow waters before the Cambrian explosion.
A team of scientists has found the oldest evidence for animal life in fossil record, with steroids from sponges dating back 635 million years. The discovery suggests that multicellular animal life may have evolved earlier than previously thought, around 100 million years before the Cambrian explosion.
A tropical, freshwater turtle fossil discovered in Arctic Canada supports the idea of animals migrating from Asia to North America across a freshwater sea floating on top of the warm, salty Arctic Ocean. The find suggests a rapid influx of carbon dioxide led to a super-greenhouse effect creating extraordinary polar heat.
Researchers have identified three broad classes of camouflage body patterns in animals, including uniform, mottled, and disruptive coloration. These patterns are used by cephalopods to dynamically produce a wide range of visual disguises, making them one of the most changeable animal groups on earth.
A recent study published in Frontiers in Ecology and the Environment reveals that polarized light pollution can trigger animal behaviors leading to injury and death. Artificial light sources can attract or repulse animals, causing them to migrate incorrectly, choose poor nesting sites, or become trapped by reflective surfaces.
The four-eyed spookfish uses mirrors to focus light in its eyes, producing bright and high-contrast images. This unique adaptation gives the fish an edge in the deep sea, where spotting brief flashes of bioluminescent light can mean the difference between eating and being eaten.
A comprehensive 'inventory' of life in Antarctica has revealed over 1200 known marine and land species, including sea urchins, free-swimming worms, crustaceans, and birds. The study found surprising high biodiversity in the region, with many temperate and tropical species present.
Marine biologists propose that animals learn the unique magnetic signature of their home area early in life and retain it to navigate back to their birthplace for reproduction. The theory suggests that magnetic imprinting helps animals distinguish their home location from others, allowing them to return years later.
Researchers have discovered that sea slugs can survive and thrive using a process similar to photosynthesis, harnessing solar power from tiny organelles called plastids. The slug's ability to retain these plastids allows it to convert sunlight into food, enabling it to make its own sustenance like plants.
Scientists discovered giant deep-sea single-celled organisms leaving complex tracks on the ocean floor near the Bahamas. The finding questions the fossil record and suggests that single-celled protists may have been the precursors to bilateral symmetry in animals.
Scientists studying the larvae of a marine ragworm discovered that nerve connections between the photoreceptor cell and cilia regulate swimming motion. This finding sheds light on how early eyes evolved to sense direction and drive phototaxis in marine plankton.
A team of scientists has discovered a new green fluorescent protein in a deep-sea creature, which can be used as a marker in living cells and tissues. The protein, named cerFP505, has similar brightness and stability to existing fluorescent proteins, making it an ideal lead structure for super-resolution microscopy.
Researchers from the University of Leicester and Cambridge have solved the mystery of how soft tissues in 500-million-year-old fossils were preserved. The team found that deep heating transformed delicate organic tissues into mineral-rich sites, revealing intricate details such as gills, guts, and eyes.
Researchers have discovered a crucial mechanism behind the formation of sea urchin spicules, which can inform the development of new superhard materials and microelectronics. The study reveals how amorphous calcium carbonate transforms into calcite through an unusual process involving crystallinity propagation.
A new study published in Nature sheds light on the complex changes that occurred during the transition from aquatic to terrestrial lifestyles, including the evolution of limbs and internal head skeleton. The research reveals that Tiktaalik roseae, a transitional fossil, exhibits features of both fish-like and tetrapod characteristics.
Researchers reveal Tiktaalik roseae's internal head skeleton, showing key intermediate steps in the transformation of the skull that accompanied the shift to life on land. The study demonstrates that the gradual transition from aquatic to terrestrial lifestyles required significant changes in the head and neck structures.
Researchers found fossilized tracks of an aquatic creature, suggesting animals walked on legs at least 30 million years earlier than thought. The discovery pushes the timeline for complex life on Earth back to the Ediacaran period.
A billion-year-old history of microRNAs has been discovered in ancient animal lineages, including sponges and starlet sea anemones. This finding suggests that these tiny molecules have evolved rapidly across various species, potentially playing a key role in the emergence of multicellular life.
The analysis of Trichoplax adhaerens' genome sheds light on the ancestral relationship between placozoans and other animals, revealing a complex suite of genes and signaling pathways. The findings also suggest that placozoans may have played a more significant role in animal evolution than previously thought.
Climate models predict a nearly ice-free Arctic Ocean by 2050, which will restore conditions that allowed Pacific shellfish to invade the Atlantic three million years ago. Several north Pacific species have relatives in the North Atlantic and are expected to resume their invasion when cold conditions return.
Massive underwater volcanic eruptions occurred 23 thousand years before a global oceanic anoxic event, leading to the extinction of ocean life. The eruptions released nutrients and oxygen-depleting gases, causing a chain reaction that ultimately led to the mass extinction.
A decade-long study published in Science reveals that most diversification occurred early on, with local ecological communities changing relatively little over time. The researchers used a fundamentally new analysis to conclude that the increase in species diversity was less dramatic than previously believed.
Researchers discovered a record number of tyrosine kinase genes in Monosiga brevicollis, a single-celled microbe. The microbe's signaling network is more diverse and elaborate than found in any multicellular organism.
Scientists have identified marine species that produce compounds interfering with NF-kB, a protein linked to cancer and other diseases. These compounds may allow normal cell death in cancerous cells, while also improving drug delivery to tumors and other targeted areas.
A symposium in the Biological Bulletin highlights the powerful advantages of using gene catalogs to infer biological function in marine animals, including the sea urchin and tubeworm. By comparing their genomes with those of other organisms, researchers can gain new clues about how physiological systems evolved.
Scientists at Harvard University have discovered that bdelloid rotifers can capture and incorporate genetic material from plants, fungi, bacteria, and animals into their genomes. This finding challenges traditional notions of sexual reproduction and may provide insight into the animals' ability to adapt to new environments.
Researchers found that mantis shrimp can see colours from ultraviolet to infrared and measure four linear and two circular polarisations, enabling them to detect subtle changes in light. This unique talent presents a new concept of polarisation vision, allowing shrimps to navigate and find food more effectively.
A PLOS study highlights key conservation areas for threatened frogs and toads in Latin America, emphasizing the importance of considering life-history traits. The research reveals that regions with aquatic larval stages are crucial for species like Phyllomedusa ayeaye, while those without tadpoles require targeted conservation efforts.
A new study by the University of New South Wales reveals that contaminated seaweeds in Sydney Harbour are killing up to 75% of small crustacean offspring. The harbour's seaweeds have been found to contain high levels of copper, lead and zinc, posing a threat to marine life.
A UC Riverside-led study tracked biogeochemical signatures in ancient sedimentary rocks to establish the nature and timing of oxygenation in Earth's atmosphere. The research suggests that a molybdenum-depleted ocean may have retarded the development of complex life for nearly two billion years.
Researchers found a significant delay in the evolution of animal life due to low levels of oxygen and molybdenum in ancient deep oceans. This discovery provides new insights into the environmental conditions that led to the emergence of animal life.
Researchers at Harvard University discovered that bdelloid rotifers are extremely resistant to ionizing radiation, surviving doses much higher than other animal species can tolerate. The findings could lead to new research into the role of free radicals in inflammation, cancer, and aging.
Researchers discover ancient organism with multiple reproductive strategies, including sexual reproduction, dating back to the Neoproterozoic era. The findings suggest that ecosystems were complex and interconnected hundreds of millions of years ago, providing insights into early life evolution and potential extraterrestrial life.
A study published in PNAS reveals that evolution drives animals to become more complex, with most branches evolving in the same direction. The researchers found that complexity increases as organisms adapt to their environments and compete for resources.
Researchers discovered that alligators use a combination of muscles to shift their lungs and maneuver in the water. This unique ability allows them to dive, surface, and roll sideways without creating disturbance. The study highlights the importance of specialized muscles in aquatic animals for navigation and stealth.
Northern right whales migrate to Florida waters from November to April to give birth, while NOAA researchers collect DNA samples to identify individuals and monitor the population's genetic variation. The project helps assess the population's composition and condition, improving prospects for their survival.
Two oxygenation events in ancient oceans between 635 and 551 million years ago led to the increase and spread of complex life, including animals. This finding supports the growing view that life and environment co-evolved during this tumultuous period of Earth history.
Geologists at the University of Leicester solved a 100-year-old mystery by analyzing the Burgess Shales rocks. They found that the rocks were instantly buried, preserving soft tissue in exquisite detail.
Scientists warn that small sea creatures like pteropods, which are eaten by many species, may go extinct due to ocean acidification and warming. This could have catastrophic effects on the food chain, as these organisms play a vital role in marine ecosystems.
A team of scientists from NOAA and Oregon State University have discovered widespread areas of low-oxygen water off the northwest coast, which may be causing deaths of marine animals that cannot escape. The study suggests that these conditions are associated with coastal upwelling and plankton production.