Articles tagged with Whales
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A team of researchers from the University of New South Wales has discovered a new population of pygmy blue whales in the Indian Ocean, using data from underwater bomb detectors. The finding, published recently, confirms the existence of this smallest subspecies of blue whales, which can reach up to 24 meters long.
A study found that North Atlantic right whales are significantly shorter today than they were 30-40 years ago, with average length decline of 7%. The researchers suggest that severe entanglements in fishing gear may be the main cause of this decline.
Researchers developed a machine learning technique to detect North Atlantic right whales by listening for their sounds underwater. The technology can remove unwanted noises, increasing the reliability of detecting right whales in adverse conditions, and offers hope for the species' survival and population increase.
Researchers from Alfred Wegener Institute found that fin whales regularly inhabit waters surrounding Elephant Island, indicating a notable achievement in the fin whale population's recovery. The study suggests that protecting this habitat is crucial due to frequent visits by cruise ships and extensive krill fishing.
Researchers analyzed stable isotope analysis of skin, muscle, and bone tissue to study Sowerby's beaked whale spatial ecology. The results show that the species exhibits both short- and long-term habitat fidelity, with at least two subpopulations in the eastern and western Atlantic.
A new study on the 25 million-year-old fossil skull of Aetiocetus weltoni reveals that it had both teeth and baleen in adulthood. The discovery provides evidence of a major shift in feeding behavior from raptorial carnivory to filter-feeding, and sheds light on the evolution of modern baleen whales.
A study published in Environmental Toxicology and Chemistry reveals high levels of contaminants in killer whales near Norway, affecting their tissues and offspring. The findings also highlight the persistence and mobility of chemicals in marine ecosystems.
Two new studies show that whale-watching vessels frequently disregard legal guidelines, chasing whales, getting too close to calves, and forcing changes in behavior. Researchers also found that tourist boats surround a single mother and calf, highlighting the need for better conservation efforts.
A new study found significant variation in PCB concentrations among Icelandic orcas, with those eating mixed diets having up to 9 times higher levels. This contradicts earlier research and highlights the need for individualized assessments of health risks in killer whale populations.
A new study found that while man-made noise dominates in some Australian waters, the vast majority of regions remain unpolluted by ship noise. The research highlights the need to protect Australia's pristine oceans and set out proactive measures to manage marine environments.
Researchers observed shifts in nasal passage orientation in spotted dolphin and fin whale embryos and fetuses, revealing a complex evolution process. The study suggests that the two types of cetaceans may have developed their characteristic blowholes through different developmental processes.
Researchers found that Gray's beaked whales have high genetic diversity and flexible social systems, allowing them to adapt to changing conditions. The species' ability to thrive in the face of environmental shifts could provide insights into how other deep-sea animals respond to rapid ecological change.
Researchers attached an omnidirectional camera to a humpback whale to study its resting behavior. The whale was found to be inactive for half the recorded period, with active behavior in the latter half, suggesting it may have been recovering from foraging.
Researchers from Aarhus University found that harbor porpoises are drawn to decommissioned oil platforms in the North Sea, where they can find an abundance of fish and shelter. The installations act as artificial reefs, providing favorable living conditions for the whales.
A new analysis shows that Southern Resident killer whales prey on a variety of fish species throughout the year, including Chinook, steelhead, chum, and coho salmon. The researchers found that the whales' diet becomes less diverse during lean times, highlighting the need for strategies to support their food supply.
Killer whales in the Pacific Northwest are threatened by the decline of Chinook salmon, their primary food source. The study highlights the interconnectedness of these marine species and the need for conservation efforts to protect both predators and prey.
The report reviews available tools and current understanding of the health status and trends of individual whales and the species. It concludes with recommendations for additional information needs and necessary management actions to enhance the health of individual right whales.
A recent study published in Conservation Science and Practice found that known deaths of critically endangered North Atlantic right whales account for only 36% of the true death toll. The study analyzed data on whale encounters, animal health, serious injuries, and necropsies to determine undercounting of human-caused mortalities.
A new study found that whale sharks can heal from lacerations and abrasions within weeks, with partially removed dorsal fins re-growing. This knowledge provides a preliminary understanding of wound healing in this species, highlighting the importance of conservation management to minimize human impacts.
A new study by a University at Buffalo researcher challenges the cultural transmission hypothesis suggesting that whales learn their songs from others. Humpback whales' songs are changing in a precise manner, similar to beat-matching in music, contradicting existing research on cultural transmission and social learning.
Researchers used fin whale songs to create images of the Earth's crust layers by recording vibrations on seismometers. This method offers a novel approach to seismic research, particularly in areas where traditional methods are expensive or impossible to obtain.
Researchers use fin whale songs to probe Earth's crust at seafloor, producing lower-resolution results than traditional air-gun signals. The method complements conventional techniques and avoids harming ocean life caused by powerful blasts.
Researchers have developed a new DNA-based technique to determine the age and sex of living beluga whales in Alaska's Cook Inlet. The method uses DNA methylation data and machine learning to create an epigenetic clock for the species, providing accurate age estimates vital to conservation efforts.
A new international study suggests that starvation is contributing to the mortality of gray whales along the west coast of Mexico, USA, and Canada. The researchers used drone photogrammetry to measure the body condition of the whales, which showed a marked decline in juvenile and adult gray whales visiting Laguna San Ignacio.
Scientists have developed a method to track marine life in the Arctic using water samples, revealing insights into climate change impacts on bowhead whales and biodiversity. By analyzing environmental DNA in water bottles, researchers can monitor population diversity and patterns of migration.
A team of researchers has discovered a new population of blue whales in the western Indian Ocean, identified by their unique song. The population is thought to spend most of its time in the northwestern Indian Ocean, challenging previous assumptions about whale migration patterns.
A new study from Oregon State University uses fecal samples from Eastern North Pacific gray whales to assess endocrine levels and establish hormone baselines for stress and reproduction. The findings provide valuable context for understanding how human activities impact whales.
Researchers analyzed acoustic data from humpback whale songs to track population changes in the North Pacific. The study found a significant decrease in acoustic energy levels between 2014-15 and 2018-19, mirroring the declining number of whales during this period.
Research from the Alfred Wegener Institute reveals that Antarctic minke whales prefer to live in regions covered with sea ice, while humpback whales avoid them. The findings provide essential information for successful marine protection in the Antarctic and highlight the importance of long-term acoustic observations.
A study by Flinders University has tracked the movements of 13 pygmy blue whales along Southern Australia's foraging grounds and migratory routes. The research provided new insights into the ecological data, highlighting the importance of upwelling centers in mitigating human activities' impacts on the species.
Researchers found southern Australian long-finned pilot whales can mimic killer whale calls and engage in 'duetting' with other whales, revealing a complex acoustic communication system. The study's findings raise questions about the extent of home ranges for these whales.
A study analyzing necropsy reports of stranded killer whales found human activity as a cause of death for orcas across every age group. The study highlights the need to address human interactions, such as vessel strikes and fishing gear entanglement, to protect these vulnerable populations.
A decade-long analysis of necropsies reveals that killer whales are vulnerable to multiple human-caused deaths, affecting all age classes. The study underscores the need for improved conservation strategies and mitigation efforts to protect these endangered species.
A decade-long study of killer whale necropsies reveals widespread mortality linked to human activities, affecting all age classes. Human-caused deaths were found in healthy populations as well as endangered species, emphasizing the need for improved conservation strategies.
A new co-governance model aims to save species such as salmon and southern resident killer whales from extinction through a $381 million conservation plan. The study highlights the importance of urban biodiversity conservation and investment in strategies like habitat restoration and public land management.
After being wiped out by whaling, blue whales have made a comeback to South Georgia, with 58 sightings reported in a 2020 survey and numerous acoustic detections. The discovery is key evidence in learning how the species is recovering following a ban on commercial whaling.
A new study from the New England Aquarium improves species distribution models for predicting whale habitats by incorporating food availability, such as zooplankton. The prey-centric model suggests that protections are needed in areas where whales are currently found and may be migrating to due to climate change.
New research suggests fin whales sing multiple different songs, which may be picked up by migrating individuals and spread to different parts of the ocean. This complex behavior provides new insights into how fin whale populations move and change over time.
Researchers discovered that whale-surfing remoras use the cushion of slow-moving water carried by whales to stay attached. The fish can move along the whale's body and even skim across locations without being torn free.
Researchers captured the first ocean recordings of remoras hitchhiking on blue whales, revealing their refined skillset for navigating intense hydrodynamics. The study shows remoras select optimal regions, such as behind the blowhole, to reduce drag resistance and freely move around to feed and socialize.
Researchers found that blue whales sing mainly at night during the summer feeding season, but switch to daytime singing when preparing to migrate. This discovery may explain inconsistencies in whale song patterns.
Researchers at Stanford University have identified patterns in blue whale songs that indicate migration from feeding grounds to breeding grounds. The study uses advanced recording technologies to analyze whale song wavelengths, revealing a distinct change over several months.
Researchers found vessel traffic and whale vocalizations contribute to ambient sound, with fluctuations by month and seasonal peaks. The study establishes a baseline for understanding the impact of human-made noise on the sanctuary's ecosystem.
A new international study led by Stony Brook University explores the role of climate change and tectonics in shaping mammalian evolution in East Africa. The research team will investigate ancient climate and habitats through fossil analysis and modeling studies, shedding light on the emergence of humans and their primate ancestors.
Researchers deployed 23 tags to track Cuvier's beaked whale dives, recording over 3600 foraging dives with some lasting up to 2 hours and 13 minutes. The whales' ability to exceed predicted diving limits suggests an exceptional low metabolism and larger oxygen stores.
Female whale sharks grow more slowly than males but eventually surpass them to reach an average adult length of 14 metres. The study found that only one pregnant whale shark had produced 300 young, highlighting the benefits of large size for female whales.
A study reveals genetic similarities between New Guinea highland wild dogs and captive NGSDs, suggesting a shared ancestry. The discovery could help bolster NGSD populations through conservation efforts.
A study by Florida Atlantic University's Harbor Branch Oceanographic Institute found high concentrations of atrazine, DEP, NPE, and triclosan in stranded dolphins and whales. The study revealed significant variations in toxin and element concentrations based on animal demographic factors and geography.
Researchers measured pollutants in stranded dolphins and whales to understand their impact on ocean life. The study found high levels of mercury and arsenic in some species, highlighting the need for marine mammal stranding response efforts.
The study revealed the Mediterranean sperm whale's widespread presence in the north-western Mediterranean Sea and identified a possible hotspot for habitat in the Gulf of Lion. Continuous day and night monitoring during winter months suggests different foraging strategies between areas.
Researchers found significantly less microbial diversity and richness in humpback whales' respiratory microbiota during the return leg of their migration, suggesting they were likely in poorer health. This study provides new insights into using airway microbiota as a non-invasive method for monitoring whale health.
Researchers tracked baleen whale movements using passive acoustic recordings, finding four species have changed their distribution patterns in the past decade. The Gulf of Maine is warming faster than other regions, resulting in changes in distribution for five out of six baleen whale species.
A study of beluga whale social behavior reveals that they form complex societies with multiple group types and dynamic membership. Like humans, belugas exhibit a wide range of grouping patterns and have long-term affiliations with unrelated individuals, indicating the importance of kinship in their social structure.
A nearly complete skeleton of an extinct large dolphin found in South Carolina reveals that this species was a top predator in its community. The findings suggest that modern baleen and toothed whales evolved similar features independently, driven by parallel evolution in the same aquatic habitats.
A study of thalattosuchians' inner ear morphology reveals a strikingly compact and reduced bony labyrinth reminiscent of whales. The evolutionary transition from land to water occurred after a prolonged semiaquatic phase, distinct from whales' rapid adaptation.
Researchers from Aarhus University found that boat engines can disturb humpback whales, causing them to change behavior and reducing their resting time. The team recommends a 150 dB noise emission standard to minimize disturbance, ensuring whales receive some peace and quiet.
Researchers found that changes in ocean temperature and krill abundance affect the whales' feeding grounds, with cooler waters providing nutrient-rich areas. Understanding these relationships can help reduce threats to New Zealand blue whales from climate change and human impacts.
A new study suggests that operating with fewer traps and a shorter season in the US lobster fishery may be more profitable for fishermen while also protecting endangered North Atlantic right whales. The research found that Massachusetts fishers have caught more lobster since implementing a three-month fishing closure, while Maine's lob...
Researchers found most southern right whales visiting South Georgia breed in South America, contrary to previous suspicion. This discovery will help track population recovery and inform conservation strategies.
A new study found that humpback whales are at risk of collision with vessels in the Magellan Strait, with some individuals encountering ships up to 18 times per season. The researchers propose speed limits and mandatory observers on commercial vessels to reduce the risk of injury or death.