Articles tagged with Whales
Researchers challenge long-held 3/4-power law of metabolism with new paper, finding support for 2/3 exponent in geometry and network analysis. Empirical evidence from animal studies also aligns with 2/3 exponent, suggesting a potential universal scaling law for metabolism.
Two studies show that bats and toothed whales' echolocation abilities converge in the prestin gene, a hearing gene, leading to similar adaptations. The research suggests that convergence of complex traits like echolocation may be more common than previously thought.
A new study by researchers at the University of Michigan found that echolocating bats and whales share a similar molecular mechanism for this ability, overturning conventional thinking on convergence. The research focused on the prestin gene, which plays a crucial role in hearing and amplifying sounds.
A recent study published in Molecular Ecology suggests that Antarctic minke whale populations have not increased due to commercial whaling. The research estimates the long-term population size of Antarctic minke whales to be around 670,000 individuals, similar to current estimates from sighting surveys.
A new study published in Molecular Ecology suggests that minke whale populations are not preventing the recovery of larger whales due to competition for food resources. The research found that genetic diversity within the minke whale population is similar to pre-whaling levels, allowing large whale species to recover.
Researchers use new acoustic sensors to monitor endangered North Atlantic right whales and reduce ship strikes, a leading cause of their deaths. The tools improve monitoring capabilities and enhance management efforts to protect these whales.
A 25 million-year-old fossil from Australia has provided new insights into the evolution of baleen whales. The discovery confirms Charles Darwin's hypothesis that early whales may have been suction feeders, with a possible precursor to filter-feeding in modern blue whales.
A new method to identify priority areas for whale conservation has been proposed, suggesting that even small protected areas can benefit highly mobile marine predators like killer whales. The research highlights the importance of feeding behavior in conserving endangered southern resident killer whale populations.
Scientists unveil the story of a 4.5 million-year-old whale, shedding light on fossilization and taphonomic processes. The study provides insights into the ecological phases associated with whales in the past.
Scientists at UC San Diego discovered a downward curve in the pitch of blue whale songs across the globe. The decline may be due to an increase in population size, allowing males to sing lower frequency songs that don't need to travel as far.
Researchers have created a method using microphone arrays to estimate bird population density from recorded sounds, which may also be applied to tracking whales and dolphins. This innovative approach eliminates the need for observers to count birds, providing a more accurate index of abundance.
Researchers use X-ray scanners and advanced computing to create detailed replicas of a whale's hearing anatomy. The study suggests mid-frequency sonar sounds are largely filtered, while higher frequencies used by whales for hunting are amplified.
Researchers have discovered up to 15 species of boneworms in Monterey Bay, which feed on dead whales and exhibit unique life cycles. The worms' ability to adapt to different environments and find food sources has led scientists to estimate their evolutionary origins, suggesting they may date back to the time of dinosaurs.
A new initiative aims to sequence the genomes of 10,000 vertebrates, including whales, dolphins, and porpoises, to gain better understanding of species diversity, evolution, and conservation. The project, called Genome 10K, has the potential to revolutionize our knowledge of cetaceans and inform effective conservation strategies.
Researchers have developed a tool to analyze marine mammal calls, finding that whales adjust click intervals to prevent cluttering echoes. This strategy enables groups of whales to explore more efficiently, suggesting a 'polite listener' behavior.
A massive genetic analysis of over 1,500 whale DNA samples has revealed new insights into the population dynamics and relationships of Southern Hemisphere humpback whales. The study provides a detailed understanding of gene flow between populations and highlights the complex interactions within marine ecosystems.
Scientists have recorded the first observations of albatrosses feeding alongside marine mammals at sea. The miniature digital camera attached to four black-browed albatrosses shows them foraging in groups while collecting food for their chicks, and provides the first observation of an albatross feeding with a killer whale.
A comprehensive study sheds light on the origin of whales and dolphins by analyzing morphology, behavior, and genetics of living and fossil relatives. The findings suggest that cetacean ancestors transitioned to water before becoming carnivorous, with a 48-million-year-old semi-aquatic herbivore named Indohyus being a key discovery.
Researchers at the University of Gothenburg have discovered nine new bristleworm species that feed on dead whales, highlighting a previously unknown food source in marine ecosystems. The study reveals these specialized organisms play a significant role in nutrient cycling and ecosystem balance.
Researchers discovered that whale falls create persistent chemosynthetic habitats in surrounding sediment for over seven years. These habitats are comparable to those found at deep-sea cold seeps and hydrothermal vents.
Researchers have discovered that dolphins' flippers exhibit aerodynamic properties similar to modern delta wing aircraft. The study found that swept-back flippers are the most efficient at generating lift, with the bottle nose dolphin's triangular flippers being the most efficient overall.
A new form of unregulated whaling is emerging along Japan and South Korea's coastlines, threatening minke whale stocks. DNA analysis reveals that up to 300 whales may be killed annually through bycatch whaling, equivalent to Japan's scientific whaling program.
A 700,000-year-old fossil bone bed in California has been found to be a record of normal life and death, rather than a catastrophic event. The bone bed, which features shark teeth and seal bones, was formed under unusual climatic conditions that kept sediment at bay.
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 team of scientists from Oregon State University and NOAA has documented the presence of endangered North Atlantic right whales in an area off Greenland, contrary to previous belief. The discovery highlights the importance of identifying key habitats for these fragile species as shipping lanes expand.
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.
Researchers used Google Earth to locate a quarry site in Egypt where they discovered fossilized remains of small mammals from the early Miocene Epoch. The finds may provide insights into the migration of animals from Asia to Africa and the evolution of African wildlife.
The 157th ASA Meeting explores various disciplines and unique sounds. Wimps hear dangerous noises differently due to physical fitness, while fish living in darkness have exceptionally sensitive ears. Researchers also study medical devices using sound to treat disease, a long-gone whale's comeback, and cowards' evolution.
A new study found that whale sharks from different oceans are genetically similar, indicating migration and interbreeding among far-flung populations. This suggests that conservation efforts must consider the sharks' global habitat usage to effectively protect them.
Researchers dispute a recent study that creates a different family tree for the hippo, arguing that it ignores important DNA data. Hippos are closest living relatives of whales, according to most DNA evidence from the last 12-13 years.
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.
Young southern right whales learn from their mothers where to feed in the ocean, but researchers worry they may not be able to adapt if food sources become scarce due to global warming.
The discovery of a 47.5 million-year-old fossil whale in Pakistan provides evidence that early whales gave birth on land, contrary to the long-held assumption that they gave birth at sea. The fossils reveal that these ancient whales had well-developed teeth and could fend for themselves from an early age.
Researchers found that older killer whales nearing menopause have a 10% higher survival rate for their calves compared to younger females. This suggests that these older mothers may be more successful in rearing their young due to maternal experience and increased allocation of effort.
NOAA researchers have identified a wintering ground for North Atlantic right whales in the Gulf of Maine, with 44 individual whales spotted in December. The sightings suggest that the region may also be a potential breeding ground for the endangered species, which is critical for their protection.
Humpback whales use a high-speed diving technique called lunge-feeding to catch prey, but this method comes with significant energy costs. The study found that lunge-feeding requires more energy and time than other behaviors, such as singing.
A recent paper by George Mason University professor Chris Parsons highlights the link between US Navy sonar and mass whale strandings worldwide. The study reveals that sonar is killing more whales than previously known, emphasizing the need for stricter environmental policies.
Scientists have discovered that whale flippers and dolphin tails influence the shape of wind turbine blades, creating a more efficient design. The new design has been shown to reduce drag and increase lift, defying traditional engineering theories.
A new study reports finding persistent organic pollutants in deep-sea cephalopods, including octopods and squids. The presence of these chemicals suggests contamination of the deep-ocean food web is occurring, with significant implications for marine life.
A new system of smart buoys installed along Massachusetts Bay's busy shipping lanes is helping to reduce collisions between right whales and ships. The buoys recognize the whales' distinctive calls and provide real-time warnings to ships, allowing them to avoid deadly encounters.
A Russian-American research team has made significant discoveries about the origins of whaling culture in the Arctic region. The findings suggest that prehistoric cultures were hunting whales at least 3,000 years ago, with evidence found at the Un'en'en site on the Chukotka Peninsula.
Researchers are developing a global monitoring network for ocean noise to protect endangered species like the North Atlantic right whale. The project uses 3-D buoys to record sounds from whales, fish, ships, and other sources in the Stellwagen Bank National Marine Sanctuary.
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.
Scientists have discovered Antarctic krill thriving in deep waters, down to 3000 meters, contrary to earlier assumptions about their surface-dwelling nature. This finding sheds light on the complex behavior of marine organisms and highlights the importance of exploring the deep sea to understand our planet.
A team of scientists has discovered a new pathway for sound transmission in Cuvier's beaked whales using finite element modeling and computed tomography scanning. This finding challenges the long-held assumption that noise vibrations travel through the lower jaw to reach the ear complex, instead revealing a unique fatty channel.
A new study suggests whale shark populations are healthy and growing in Ningaloo Reef due to regulated ecotourism. The research used computer-assisted photographic identification to track individual sharks and found two-thirds of the sharks were repeat visitors.
A study by researchers at the University of California, Santa Cruz, found that certain marine mammals have evolved to protect their brains from conditions of low oxygen. The amounts and kinds of globins in the brain correlate with physical activity patterns of various wild mammals.
The AAAS Science Journalism Awards recognize outstanding work in science reporting, including a series on ocean disturbances and stories on mysterious elk deaths. Winners include Jennifer Frazer and Kenneth Weiss for their coverage of these topics.
A fossilized whale skeleton found on California's Año Nuevo Island is the youngest and most complete known example of a whale fall in North America. The 11- to 15-million-year-old skeleton was home to multiple mollusks, challenging previous theories that large whales were necessary for these deep-sea communities to thrive.
A new study reveals that gray whale populations are significantly lower than their historical estimates, suggesting a reduced food supply due to climate change and altered Arctic ecosystems. The findings also indicate that the current population is too small to play its natural role in ocean ecology.
Toothed whales developed sonar to track squid in surface waters at night, allowing them to follow cephalopods as they migrated downwards into darkness. This led to the refinement of echolocation systems, enabling whales to hunt squid in deep ocean depths.
A study on bowhead whale population dynamics has helped maintain a quota for Eskimos to harvest 56 whales per year, supporting their traditional food source. The research suggests that the whale's population is increasing, allowing it to thrive under sustainable management.
Scientists found a new species of sea anemone, Anthosactis pearseae, living on the carcass of a dead whale 1.8 miles below sea level. The anemone is small and white, with roughly uniform tentacle length, and may provide clues about human impact on deep-sea ecosystems.
A study analyzing whale meat sold in Korean markets suggests the number of whales being sold for human consumption is much higher than reported to the International Whaling Commission. The researchers estimate that nearly twice as many minke whales passed through Korean markets between 1999 and 2003 as were officially reported.
Researchers found humpback whales migrating up to 8,300 kilometers to warmer waters during winter, with the longest distance recorded at 5,100 miles from Central America to Antarctica. The study validates a long-held assumption about humpback whale migration patterns.
Researchers successfully tag sperm whales and jumbo squid swimming together, providing new insights into the diving behavior of both species. The study, published in Marine Ecology Progress Series, raises questions about the feeding habits and hunting strategies of sperm whales and their prey.
By analyzing lobster fishing operations in American and Canadian waters, researchers found that reducing fishing efforts can substantially decrease entanglement risks. Implementing a 6-month lobster fishing season and decreasing trap numbers could greatly benefit the critically endangered species while providing benefits to fishermen.
A team of scientists has observed bizarre deep-sea communities living around methane seeps off New Zealand's east coast, including tube worms, shell beds, and coral. The expedition discovered four types of chemosynthetic habitats in close proximity, providing valuable insights into the distribution patterns of biological life.
Researchers have found that beaked whales can dive as deep as 1,900 meters in search of food, with a maximum duration of 85 minutes. The team's analysis suggests that the whales' extreme diving behavior does not pose a decompression risk from naval sonar exercises.