Articles tagged with Whales
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A 16-year study reveals that the Azore islands are becoming a crucial part of the Atlantic whale shark's habitat due to rising ocean temperatures. The researchers found that increased sightings were correlated with higher water temperatures and seafloor features, such as slopes and seamounts.
New research reveals whales have a powerful impact on oceans, global carbon storage, and commercial fisheries. The recovery of great whale populations may buffer marine ecosystems from climate change threats by recycling nutrients and enhancing productivity.
A NOAA regulation has been effective in lowering ship speeds in areas with North Atlantic right whales, helping protect these critically endangered animals from collisions. The policy of notifying speeding vessels resulted in improved compliance rates, especially among cargo vessels.
The Panama government has implemented new traffic separation schemes to minimize overlap between commercial vessels and humpback whale migration routes. The changes are expected to reduce vessel speed four months a year and minimize vessel-whale collisions by up to 95%.
A genetic study has identified three distinct subspecies of humpback whales in the North Pacific, North Atlantic, and Southern Hemisphere. The findings suggest that these populations have been isolated for thousands of years, with some populations migrating only between warm equatorial waters.
Researchers at Northwestern University developed a new metric to measure energy consumption efficiency in animals of different sizes. Contrary to expectations, the study found that the gray whale and skipjack tuna are almost equally efficient, with the whale's higher fuel consumption being an unavoidable consequence of physics.
Researchers developed a way to simplify modeling of 'bistable' systems, involving two evolving species with different timescales. This new approach can accurately predict population dynamics and time to extinction in predator-prey models.
A new study re-describes the oldest species of dolphin, Eodelphis kabatensis, shedding light on their origins and evolution. The discovery resolves a discrepancy between fossil records and molecular-based studies, providing crucial insights into the evolutionary history of dolphins.
A new investigation in the Canadian Journal of Cardiology challenges the long-held recommendation to include oily fish in a heart-healthy diet. Researchers found that Greenland Eskimos, who were initially believed to have low rates of coronary artery disease, actually suffered from CAD at the same rate as other populations.
Researchers found the bio-duck sound is made by Antarctic minke whales, which stay in ice-covered waters year-round or migrate to lower latitudes. The discovery helps improve understanding of the species' distribution, abundance, and behavior.
Researchers analyzed stomach contents of pygmy and dwarf sperm whales to better understand their feeding ecologies. The study found that while the two species share similar foraging parameters, pygmy sperm whales consume a greater diversity and size of prey.
Researchers discovered fossils of Tamisiocaris, an early arthropod that evolved from large predators to gentle suspension feeders. This finding highlights the productivity of the Cambrian period and provides insight into ancient ecosystems.
Researchers monitored Cuvier's beaked whales' record-breaking dives to depths of nearly two miles below the ocean surface and some dives lasted for over two hours. The dives captured by this study exceed previous records, including the mammalian dive record previously set by southern elephant seals.
Researchers found that humpback whale skin bacterial communities consist mainly of Tenacibaculum and Psychrobacter spp., but differ by geographic location and metabolic state. The study suggests that these bacteria may act as an indicator of whales' health and the environment.
Researchers at Woods Hole Oceanographic Institution identified a core skin bacterial community shared by humpback whales across populations, suggesting a way to assess their overall health. The study's findings could aid in population health monitoring and conservation status of threatened or endangered marine mammals.
Researchers used remote acoustic monitoring to analyze North Atlantic right whale behavior and found that males produce a loud 'gunshot' sound mainly in autumn at night. The study confirms Roseway Basin as a vital habitat area for endangered whales, supporting conservation efforts to save this critically endangered species.
Scientists tracked 18 individual minke whales using passive acoustic monitoring, finding that each species uses a unique call sequence to interact with others. The findings provide insight into minke whale social interactions and migration patterns.
A study by the University of Washington's Applied Physics Laboratory reveals more detections of whales traveling through the Bering Strait. The research tracks Arctic beluga and bowhead whales as well as sub-Arctic humpback, fin, and killer whales using underwater microphones.
High-resolution satellite images successfully counted southern right whales off the Argentinian coast, using automatic detection methods that outperformed traditional manual detection. The study's findings suggest this new approach could be applied to other whale species and marine mammal populations.
Researchers from British Antarctic Survey demonstrated a new method using Very High Resolution satellite imagery and image processing software to automatically detect and count whales breeding in the Golfo Nuevo, Peninsula Valdes. This semi-automated technique has been shown to achieve 89% accuracy in identifying probable whales.
A WCS-led satellite tracking study found humpback whales share breeding waters with offshore oil rigs, major shipping routes, and toxicants off the coast of western Africa. The researchers identified new parts of the whales' breeding range and migratory routes to sub-Antarctic feeding grounds.
Researchers have identified a new species of beaked whale, Mesoplodon hotaula, based on DNA analysis and physical characteristics of seven stranded specimens. The discovery sheds light on the elusive habits and low abundance of deep-diving whales in the world's oceans.
Research by Robert Boessenecker uncovers a record of 21 marine mammal species from the San Francisco Bay Area's Purisima Formation, dating back 5-2.5 million years. A new species of fossil whale, Balaenoptera bertae, is discovered, closely related to minke and fin whales.
A global decline in killer whale numbers occurred approximately 40,000 years ago during the last Ice Age, with a bottleneck and loss of genetic diversity. The South African population remained genetically diverse, suggesting it escaped the bottleneck due to a stable Bengeula upwelling system.
Researchers analyzed killer whale genomic data and found that populations declined during the last Ice Age due to a bottleneck effect, leading to low genetic diversity except in southern Africa's refuge population.
Experts developed a step-by-step guide to minimize seismic survey impacts on whales and other marine species. The study presents the most thorough approach to minimizing and monitoring risk of harm during intense sound surveys, primarily used by oil and gas companies.
A new study has identified five distinct humpback whale populations in the North Pacific Ocean, which could impact conservation efforts. The research used genetic analysis to determine population differences and migratory patterns.
Research suggests that killer whales eavesdrop on sounds generated by their marine mammal prey to locate and hunt them in dark waters. A two-year study in Alaska using acoustic recording tags found evidence of nighttime hunting, debunking previous assumptions about the animals' reliance on echolocation.
The study provided evidence of stress-responsive genes and anaerobic metabolism in whales, which helped them adapt to ocean environments. The researchers also found that baleen-forming genes were pseudogenes in whales, suggesting a unique evolutionary path.
A new study assesses the impact of offshore wind farm construction on marine mammals, providing a framework to mitigate potential harm. The research focuses on harbor seals and could inform climate change targets while protecting endangered species.
Researchers confirm that humpback whales in the southern Gulf of Maine are spending most of their time on the ocean floor, contrary to previous thought. The study revealed three distinct types of bottom-feeding behaviors, including simple side-rolls and seafloor scooping.
Researchers found that bats and toothed whales produce similar sounds for echolocation in the frequency range of 10-200 kHz. This convergent evolution helps them navigate and catch prey in their respective environments. The study reveals surprising similarities between these species, challenging traditional notions of adaptation.
A new study reveals areas of high human impact on marine predators such as whales, seals, and turtles along the US west coast. The research used tracking data and mapping to identify key habitats and areas for conservation efforts.
Scientists studied Yangtze finless porpoise hearing using medical technology to understand impact of constant shipping and construction on their critical sense of hearing. The research revealed variations in hearing sensitivity among different species, with implications for effective management strategies.
Researchers suspect that killer whale menopause is related to the animals' social structure, where older females help protect and care for offspring and grandoffspring. The study aims to uncover why these whales evolved this trait, which may also shed light on human menopause.
A 17-year study off New Zealand's coast found all 61 false killer whales were linked in a single social network and associated with bottlenose dolphins for up to 5 years. These partnerships may provide mutual protection against predators through increased detection ability.
A study by Wildlife Conservation Society and others confirms the existence of two subspecies of Bryde's whales, one coastal and one offshore, with distinct genetic characteristics. The research informs the need to designate both subspecies as separate conservation units with specific management needs.
New research on tagged humpback whales reveals three distinct bottom feeding techniques: simple side-rolls, side-roll inversions, and repetitive scooping. These behaviors are common in Stellwagen Bank National Marine Sanctuary and can lead to vulnerability to entanglement in fishing gear.
Researchers used blue whale earplugs to extract and analyze chemicals, hormones, and stress levels, enabling the study of lifetime chemical exposures and hormone profiles. The new method provides valuable information on human impact on individual whales and marine ecosystems.
Researchers found Pacific humpback whales increasing annually, doubling to 137 whales in 2011, with high survival rates among adults. The study highlights the importance of conservation efforts due to increased vulnerability during critical refueling stages.
Biologists have discovered that a part of the Southern Hemisphere humpback whale population spends its entire winter in Antarctic waters. The whales use ice-free areas to survive the harsh winter months.
Researchers found that some whale species darken their skin with UV exposure, accumulating DNA damage, similar to humans. Fin whales, however, were resistant to sun damage, offering insights into evolutionary adaptations to counteract UV radiation.
Researchers developed an infrared camera system to automatically spot whales in the surrounding sea. The system uses a thermal sensor to detect temperature differences and software to analyze video streams for whale spouts.
Scientists have found evidence that North Atlantic right whales mate in the Gulf of Maine, with a high proportion of potential mates aggregating there between November and January. The study used aerial surveys and genetics data to identify individuals and determine mating grounds, shedding light on the species' life history.
A recent study by NOAA scientists reveals that distinct groups of killer whales gather seasonally and exhibit low levels of gene flow, indicating separate subpopulations. Genetic evidence suggests a revision to the current stock designations for killer whales in the western Gulf of Alaska and Aleutian Islands.
Researchers found that some blue whales changed their diving behavior or temporarily avoided important feeding areas when exposed to simulated mid-frequency sonar sounds. The responses were complex and depended on various factors, including the whales' depth of feeding and location.
Scientists analyzed DNA from a New Zealand museum specimen to determine if it represents a new type of killer whale. The study found that the specimen separated from other killer whales approximately 390,000 years ago, suggesting it may be a separate subspecies or species.
Researchers at the University of Liverpool identified a distinctive molecular signature in myoglobin that allows diving mammals to store oxygen. This adaptation enables elite divers like sperm whales to hold their breath for over an hour, while land mammals can only hold theirs for a few minutes.
Researchers analyzed North Pacific killer-whale strandings, finding 88% fatal and 12% surviving, providing clues on species' overall life history, genetics, and health. The standardized necropsy system increased data collection from 2% to 33%, shedding light on the causes of death and human impact on orca populations.
Scientists attached a device to entangled whales, showing how fishing lines change their behavior and deplete energy. The study highlights the dangers of added drag and buoyancy from fishing gear, posing significant threats to whales' ability to eat, migrate, and survive.
A study published in the Journal of the Acoustical Society of America uses seafloor seismic data to analyze fin whale calls, revealing new information on their movement patterns and communication habits. The research also sheds light on the animals' feeding behaviors and potential collisions with ships.
Bone-melting acid secreted by Osedax worms dissolves whale bones to access collagen and lipids, a process similar to how mammals repair and remodel bone. The symbiotic relationship between the worms and bacteria involved in this process is still not fully understood.
A new study published in PLOS ONE tracks the movements of individual humpback whales to their singing patterns on a Northwest Atlantic feeding ground. The researchers used passive acoustic tracking to localize whale songs and relate them to specific behaviors, providing valuable insights for marine mammal conservation and management.
A study found that humpback whales can learn new feeding techniques by observing others, with a new technique called lobtail feeding spreading to 40% of the population. This demonstrates the importance of cultural transmission in shaping whale behavior and cognition.
Research reveals many marine mammal populations are increasing, with some recovering to near carrying capacity. The MMPA's strong protections against commercial and accidental killing have contributed to these recoveries.
A new study published in PLOS ONE reveals unique social interactions among great white sharks while scavenging on dead whales in South Africa. The team observed 40 different sharks feeding on a carcass over a single day, suggesting that shark populations may rely on scavenging to supplement their regular feeding activities.
Research reveals Ganges river dolphins produce low-intensity echolocation signals at surprising frequencies, while freshwater dolphins look for prey closer to home. The study provides a new perspective on the evolution of echolocation among toothed whales.
A new study published in Conservation Biology analyzed data on marine mammal and ecosystem research surveys in the Southern California Bight to identify areas with high whale densities. The researchers found that certain shipping routes pose a higher risk to fin whales, while others may be safer for humpback whales.
A new study questions the role of kinship in mass strandings of pilot whales, finding that related and unrelated individuals were present at each event. The separation of mothers and calves suggests strong kinship bonds are being disrupted prior to stranding.
A recent study challenges the hypothesis that mass strandings of pilot whales are driven by family relationships. The research found that stranded groups are not necessarily members of one extended family and that many calves have no identifiable mother among the other beached whales. This suggests that social bonds among kin may actua...