Articles tagged with Whales
Scientists from Woods Hole Oceanographic Institution analyzed antique whale oil samples from the Charles W. Morgan, discovering 11 halogenated organic compounds similar to toxic industrial HOCs.
Scientists recorded digitally-tagged narwhal vocalizations, revealing individually-distinctive pulsed/tonal signals and whistles. The findings suggest that these sounds may facilitate individual recognition or reunion with more distant group members.
A new study suggests that oceanic cold seep mollusks have an older evolutionary history than the marine mollusk community as a whole. Cold seeps may have protected these unique animals from mass extinctions and low oxygen levels, allowing them to thrive in challenging environments.
A new study from Woods Hole Oceanographic Institution found that relaxing the minimum legal size requirement for lobsters and reducing trap numbers can improve sustainability. This approach would also increase lobstermen's incomes and benefit regional economies.
Scientists used fossil and developmental data to pinpoint the genetic changes that led to whales losing their hind limbs. The gradual shrinkage of hind limbs was caused by slowly accumulated genetic changes, while the actual loss occurred when a drastic change inactivated the Sonic hedgehog gene.
Researchers tracked sperm whales using acoustic recording tags, finding that they produced 'buzzes' to locate cephalopods like squid during deep dives. This non-invasive method provides insight into the timing of prey detection and capture during dives.
Researchers found that ancient whales' hind limbs regressed over millions of years via small genetic changes, not a single dramatic event. This discovery highlights the complex process of evolution and developmental biology.
Researchers used information theory to analyze humpback whale songs and found a hierarchical structure with multiple layers of repetition. This study offers a new approach to studying animal communication and may inform research in evolutionary biology.
Scientists at Woods Hole Oceanographic Institution use ocean gliders to collect passive acoustic recordings of baleen whales, including right, sei, and humpback whales. The gliders' findings suggest a close correspondence between changes in sei whale calls and near-surface copepod abundance.
A study by British Antarctic Survey found a six-year time lag between sea temperature changes and whale breeding success. Sea surface temperatures in the Southern Ocean have increased by 1°C over the past 50 years, posing a threat to southern right whales' recovery.
Scientists use hydrophones to distinguish sounds made by different whale species, finding rare right whale sightings in the Gulf of Alaska and distinct 'dialects' among species. The study also reveals surprisingly robust populations of sperm whales during winter months.
The use of underwater listening devices has yielded surprising discoveries about the movements and calling behavior of endangered large whales in Alaskan waters. These devices have enabled scientists to detect and recognize whale calls over tens of miles, providing new insights into the seasonal habits of these marine mammals.
Researchers discover that the narwhal's tusk, measuring up to 9 feet long, contains up to 10 million nerve pathways, allowing it to detect changes in temperature and pressure. The unique structure of the tusk, with softer outer layers, may serve as a shock absorber to prevent breaks.
Harvard researcher Martin Nweeia discovers that the narwhal's tooth has hydrodynamic sensor capabilities, allowing it to detect salinity and particle gradients in Arctic waters. This unique adaptation enables the whales to survive in their icy environment and potentially discern prey.
A new technique uses a machine vision algorithm to identify individual whale sharks based on their spot patterns, allowing for better conservation efforts. The ECOCEAN Whale Shark Photo-identification Library has been established to store and analyze whale shark photographs.
A five-year study by University of Utah biologists reveals that giant whales split into three species around 5-6 million years ago, and all three were equally abundant before whaling reduced their numbers. The study used the genetics of whale lice to track the genetic evolution of whales.
The North Atlantic right whale population is critically low, with estimates suggesting only 350 individuals remain. Human activities such as shipping and fishing are major contributors to the decline, resulting in numerous deaths and entanglements that threaten the species' survival.
The North Atlantic right whale population is in a state of crisis, with 50 whales reported dead since 1986, mainly from human activities like ship collisions and entanglement in fishing gear. To prevent extinction, researchers recommend emergency measures such as reducing ship speeds and eliminating fixed fishing gear.
The North Atlantic right whale is facing extinction due to the failure of government protections, with at least 50% of deaths attributed to ship collisions and fishing gear entanglements. The species has seen a significant increase in mortality rates over the past 16 months, including six adult females with near-term fetuses.
Researchers uncover stories from native peoples describing seismic activity, shaking, and flooding, linking them to major earthquakes and tsunamis in the Cascadia subduction zone. Ancient artifacts and geological evidence support these findings, shedding light on the region's seismic history.
North Pacific right whales have been observed in the Southeastern Bering Sea slope and shelf, eastern Aleutian Islands, and Gulf of Alaska. The study refutes previous claims of a habitat shift and suggests these areas are crucial to their distribution.
DNA analysis of whale samples reveals a past with an ocean teeming with whales, contrary to recent surges in minke populations. The study also uncovers deep-sea communities thriving on whale carcasses, shedding light on life's diversification in specialized habitats.
Recent advances in genetics have revolutionized whale research, revealing surprising tales of population sizes. Marine biologist Steve Palumbi's work has sparked controversy, but also led to a deeper understanding of humpback whales' population history, estimated at 1.5 million before commercial whaling.
Researchers use underwater microphones to track whales' songs and calls in the North Atlantic, finding evidence of long-distance communication over thousands of miles. The findings suggest whales have acoustic memories analogous to visual memories, guiding their movements and distribution.
Researchers isolated compounds from whale blubber and used radiocarbon analysis to determine their source. The findings suggest that natural products also accumulate in animals, challenging the assumption that only industrial compounds do so.
Three scientists say current sanctuary plan lacks scientific basis, fails to consider migratory whale behavior and other threats. Refined conservation program using Revised Management Procedure (RMP) would be more effective in protecting whale populations.
Researchers propose that whales and hippos share a common water-loving ancestor 50-60 million years ago, which evolved into two distinct groups. The study reconciles the fossil record with molecular evidence, providing a new understanding of whale evolution.
The study aims to understand the complex linkages between environmental change, whale population dynamics, and human societies in Alaska's Arctic ecosystem. Collaborators will investigate climate variability, ice reduction, and its impact on local whaling practices and global commerce.
Research found lesions on sperm whale bones increase with age and size, suggesting chronic decompression damage. Nitrogen gas bubbles from sonar or seismic survey guns may cause acute problems in whales.
Krill populations in Antarctica have declined dramatically, with an 80% drop since the 1970s, primarily due to warming and reduced sea-ice. This decline has significant implications for commercial fisheries and the region's unique wildlife, which rely on krill as a food source.
Researchers have described the pattern of brain evolution in dolphins for the first time, revealing a significant increase in brain size relative to body size over 47 million years. This change is believed to be linked to changes in social ecology and the emergence of echolocation abilities.
Researchers studied fossil whales and found significant changes in their ear anatomy, which enabled them to transition from a land-based to a marine-based existence. The new sound transmission system allowed modern cetaceans to locate prey using echolocation, making it crucial for survival.
Researchers find two new species of worm that feed on whale bones, using symbiotic bacteria to digest fats and oils. The worms, Osedax frankpressi and Osedax rubiplumus, are closely related to hydrothermal vent worms and have unique features such as feathery plumes and green roots.
Researchers studied beaked whale responses to sound frequencies and decibel levels, revealing overestimated deep water impacts and new insights into shallow water reverberations. The study aims to improve safety guidelines for seismic operations in U.S. waters.
A team of scientists has successfully achieved the first live births of killer whales through artificial insemination. The study, led by Dr. Todd R. Robeck, used genome resource banking and artificial insemination to store sperm from male orcas for later use. This breakthrough may help maintain genetic diversity in captive marine mammals.
Researchers found that humpback whale flippers with tubercles exhibit nearly 8% better lift properties and 32% lower drag than sleek flipper designs. The study's findings have implications for improving airplane wing aerodynamics and reducing fuel consumption during flight.
Climate changes impact North Atlantic right whales by affecting zooplankton abundance, a crucial food source. Warmer conditions in the Gulf of Maine boost copepod populations, leading to improved reproductive success.
Research reveals that the removal of great whales from the North Pacific Ocean led to a domino effect of ecosystem impacts. Killer whales preyed on other marine mammals, causing devastating effects on ecosystems.
A study by geneticists from Stanford and Harvard Universities reveals that humpback, fin, and minke whale populations in the North Atlantic were much higher before commercial hunting. The researchers estimated that there were around 800,000 to 900,000 whales, contradicting previous whaling records.
A 3,360-acre marine protected area has been established off Belize's southeastern coast to safeguard the region's highest priority area for conservation. The area is home to over 25 reef fish species and is a key spawning ground for the endangered whale shark.
Researchers found that every slice of toothed whale red meat exceeded Japan's mercury limit, with some samples containing almost 200 times the maximum value. Mercury levels were higher in whales caught off the southern coast of Japan.
Scientists find that northern right whales in Grand Manan Basin are exposed to substantial amounts of paralytic shellfish poisoning toxins, which can cause chronic impairment and death. The toxins may affect diving capabilities, leading to poorer condition, reduced calving rates, and increased susceptibility to disease.
A new test for cyanobacteria toxins in freshwater systems could simplify testing, but results show the survival probability of female northern right whales is declining. The model suggests that preventing two female deaths per year could prevent extinction by 2202, with only about 300 northern right whales remaining.
Researchers discovered that fin whales sing low-frequency songs during krill feasts, which could be hampered by human-made noise. The study suggests that human activities like sonar and shipping may interfere with whale communication and reproduction, threatening population recovery.
Researchers have found that blue whales travel rapidly from one feeding area to another and continue to feed throughout the year. These blue whales move fast, adapting to survive events like El Nino by moving to high-productivity areas quickly.
Researchers studied right whales' feeding grounds, finding they use prior experience, environmental cues, and tactile clues to locate dense zooplankton patches. This understanding may help address the decline of North Atlantic right whale populations by revealing key mechanisms for their survival.
A new specialty license plate will fund whale research in Florida waters, with $25 registration fees going towards conservation efforts. The license plate will be unveiled at a ceremony in Destin, Florida, on October 17th and is expected to raise funds for whale-related research and conservation.
A new report on primitive whales found in Pakistan provides well-preserved ankle bones, allowing scientists to change their conclusions on closest relatives. The findings unify the scientific perspective on whale evolution, supporting a closer relationship between cetaceans and artiodactyls.
New fossils found in Pakistan have revealed a close kinship between whales and hippos, with the discovery of artiodactyl ankles suggesting that hippos may be a side line of artiodactyls. The findings, published in Science, use immunological, molecular, and genetic techniques to explore relationships among groups of animals.
Researchers are collecting data on the behavior of Puget Sound's orca whales using novel tools such as a small radio-controlled catamaran and a fish finder. The study suggests that the whales are declining due to a drop in salmon runs and increasing contamination from PCBs.
Historical records show that humans exploited coastal resources thousands of years ago, leading to the decline of top predators and smaller species. Wise management strategies, such as restoring native oysters and promoting aquaculture, can help conserve water quality and create habitats for fish and shellfish.
A female Northern Right Whale has been tracked every step of her journey between northern feeding grounds and southern breeding grounds using a satellite tracking tag sponsored by the Office of Naval Research. The successful tracking demonstrates a critical tool in the conservation efforts of this endangered species.
A Texas A&M University research team is counting Bowhead whales in the Okhotsk Sea to estimate their population size and understand the impact on the ecosystem. By using photo identification and genetic testing, researchers hope to gather information on the whales' feeding behavior and determine if their food supply is dwindling.
Scientists have identified a new species of right whale in the North Pacific Ocean, which is genetically distinct from other populations. The discovery was made using DNA analysis of historical specimens and suggests that there may be fewer than 300 individuals remaining in this population.
Researchers analyze three whale species to assess their recovery status and develop novel approaches to understanding decline. The study highlights the difficulties in determining when a population has recovered, emphasizing the need for data-driven conservation policy.
Researchers found that tiny mussels on whale bones and wood fragments are closely related to giant vent mussels, suggesting they could be evolutionary intermediates. The study suggests rotting whales may provide a missing link between vent and shallow-water mussel species.
Researchers analyzing humpback whale calls with information theory claim the animals may have a hierarchical grammar. The study measured entropy in the songs, finding predictable sequences of sounds that hint at complex communication.
Killer whales have begun preying on sea otters in western Alaska, leading to a decline in sea otter populations and an increase in sea urchin numbers. This chain of events is linked to the collapse of seals and sea lions, which are the killer whales' usual prey.
Researchers attribute sharp declines in sea otter numbers to killer whale predation, linked to changes in oceanic and nearshore ecosystems. The study highlights the impact of ecological chain reactions on coastal food webs and species populations.
Penn State researchers develop a finite difference method to simulate sonic boom noise for both simple and complex ocean surfaces. The new technique allows for accurate predictions of underwater noise, paving the way for the development of supersonic passenger aircraft with minimal impact on marine life.