Sentences with phrase «whale population in»

With the blue whale population in Antarctica down to 300 today from 125,000 a century ago, many representatives from anti-whaling countries say they distrust any whaling operation.

The warm waters provide a safe habitat for delivering and nursing their calves, contributing to the growing whale population in Australia.

Shane Gero of Dalhousie University in Halifax, Nova Scotia, Canada, and his colleagues tracked sperm whale populations in the Caribbean and Sargasso seas to see what happened when mothers dived for food.

The first comprehensive genetic study of humpback whale populations in the North Pacific Ocean has identified five distinct populations — at the same time a proposal to designate North Pacific humpbacks as a single «distinct population segment» is being considered under the Endangered Species Act.

At the same time, baleen whale populations in the Southern Ocean, which feed primarily on krill, are recovering from past exploitation.

The few remaining killer whale populations in European waters have very low, or zero rates of reproduction, and are close to extinction in industrialised parts of Europe.

The Aquarium has partnered with scientists from Woods Hole to monitor right whale populations in our state.

We've also learned in recent years how to track elephant seals, sea birds and some whale populations in ways that will change the map of wildlife protection, literally.

In the post, Monnahan stresses the big questions that remain about the more heavily hunted blue whale populations in the western North Pacific.

Not exact matches

Marine mammal toxicologist Peter Ross of the Vancouver Museum told Science News that he doesn't expect the chemicals to disappear from Pacific killer whales, another population in which the chemical contamination has been well documented, until the end of this century.

Despite the long gap since then, mean concentration of the chemicals in the blubber of some populations of Europe's killer whales exceeds — often by a lot — a high threshold for health damage.

«In sperm whales, and likely other whales and dolphins, culture has the potential to affect population biology, and so issues as diverse as genetic evolution and the impacts of global warming on the species.»

Other species like the American bison and many kinds of whales had once played central roles in important ecosystems but had been reduced to small remnant populations.

Laidre's team looked at what is known about marine mammal populations that play a key role in Arctic ecosystems and human communities, focusing on polar bears, beluga whales, narwhals, bowhead whales, walrus, and six different seal species.

The gulls that are now killing whale calves off Argentina weren't a big problem until an increase in fishing and urban waste drove an increase in the gull population.

«Though humpback whales are found in all oceans of the world, the North Pacific humpback whales should probably be considered a sub-species at an ocean - basin level — based on genetic isolation of these populations on an evolutionary time scale,» said Scott Baker, associate director of the Marine Mammal Institute at Oregon State University's Hatfield Marine Science Center and lead author on the paper.

And the whales are beginning to feed at various depths as well as along the sea floor, a shift that may have to do with changes in the population densities of their prey.

Palumbi used two different types of gene in the sampled whale meat to derive his estimated pre-whaling population estimate of between 500,000 and one million.

Japan's claim that these whales were originally much rarer than now is almost certainly not true, Palumbi told New Scientist, and «there is no evidence whatsoever that their population growth is inhibiting populations of other whales in Antarctica».

Most estimates of historic whale population size have been extrapolated from old whaling figures, but this method is often very inaccurate, argues marine biologist Steve Palumbi of Stanford University's Hopkins Marine Station in California, US.

The finding, experts say, has implications for conservation management, which often solely focuses on the number of animals in a population, and may extend to chimpanzees, dolphins, whales, and other species.

«It is this culture that isolates whales, leading to genetic differentiation — and ultimately, the five distinct populations identified in the North Pacific.»

European whalers hunted the whale off the coast of New Zealand in the last century, apparently reducing the population from 60 000 to around 3000.

Such a recovery in the whale population is under way among some species, but it still has a very long way to go.

• In the Northern Pacific and the southern Bering Sea, killer whales have been linked to collapsing populations of fur seals and harbor seals.

Estes calls the hunt the «first concrete and well - chronicled example of killer whales coming in and doing a significant amount of damage to a population.»

He later said that the minke whale population estimate was mistaken and noted that there was little compelling evidence showing that killer whales were significantly reducing minke whale numbers in that region.

Overall, the study's data from mitochondrial DNA — different from nuclear DNA in that it helps scientists trace maternal lineages — reveal that population structure in humpback whales is largely driven by female whales that return annually to the same breeding grounds and by the early experience of calves that accompany their mothers on their first round - trip migration to the feeding grounds.

In the largest study of its kind to date, researchers used mitochondrial DNA microsatellites from skin samples gathered from more than 3,000 individual humpback whales across the Southern Hemisphere and the Arabian Sea to examine how whale populations are related to one another, a question that is difficult to answer with direct observations of whales in their oceanic environmenIn the largest study of its kind to date, researchers used mitochondrial DNA microsatellites from skin samples gathered from more than 3,000 individual humpback whales across the Southern Hemisphere and the Arabian Sea to examine how whale populations are related to one another, a question that is difficult to answer with direct observations of whales in their oceanic environmenin their oceanic environment.

Scientists conducting the first circum - global assessment of mitochondrial DNA variation in the Southern Hemisphere's humpback whales (Megaptera novaeangliae) have found that whales faithfully returning to calving grounds year after year play a major role in how populations form, according to WCS (Wildlife Conservation Society), the American Museum of Natural History, and a number of other contributing organizations.

* Correction, 22 November, 12:19 p.m.: The story has been changed to reflect that the population estimate of whale sharks corresponded to individuals in one genetically similar group.

Using only the DNA from sloughed - off cells floating in the ocean, scientists have been able to determine the population size and genetic properties of one of the world's largest and most mysterious animals: the whale shark.

Ben G. Saroy, Head of Cendrawasih Bay National Park Authority, agreed, «Cendrawasih Bay, home to the biggest whale shark population in Indonesia, requires comprehensive information to manage this endangered species.

«Our findings give us insights into how fidelity to breeding and feeding destinations persist over many generations, resulting in differences between whale populations, and why some populations are more genetically differentiated from the rest.

«Our increased understanding of how whale populations are structured can help governments and inter-governmental organizations like the International Whaling Commission improve management decisions in the future,» said Dr. C. Scott Baker of Oregon State University's Marine Mammal Institute and a member of the South Pacific Whale Research Consortium that contributed to the swhale populations are structured can help governments and inter-governmental organizations like the International Whaling Commission improve management decisions in the future,» said Dr. C. Scott Baker of Oregon State University's Marine Mammal Institute and a member of the South Pacific Whale Research Consortium that contributed to the sWhale Research Consortium that contributed to the study.

«Understanding the context under which blue whales make calls is a critical step in developing non-invasive, non-lethal acoustic methods to study population trends and recovery status of this endangered species,» Širovi?

They included perilous falls in the populations of several whales and porpoises, the dysfunctional relationship between the science community and the administration of President Donald Trump and continuing revelations of sexual harassment in science.

In one year, a Soviet expedition took 1200 right whales, the most endangered of large whales, from a world population estimated at only 2500 animals.

From an initial population of roughly 250 000 blue whales, there remain no more than 2250 and possibly as few as 225 of them in the Southern Ocean; the best estimate is around 700.

This is intended to take account of some of the uncertainties inherent in data on whale populations, and requires only two kinds of data: current estimates and their statistical error; and historical details of catches.

IWC enacted the ban in 1986 after commercial whaling drove many whale populations to the brink of extinction.

Seeking to establish links between populations of blue whales in the Gulf of Corcovado and other regions, the researchers examined DNA collected from the skin of blue whales with biopsy darts fired from crossbows across the eastern South Pacific.

For the work published in PLOS ONE, the scientists then used acoustic calls produced by the whales to separate — for the first time — the catches taken from the California population from those whales taken in the western Northern Pacific near Japan and Russia.

In the subsequent Marine Mammal Science paper just out, the catches were among the key pieces of information used to model the size of the California blue whale population over time — a model previously used by other groups to estimate populations of hundreds of fish and various other whale species.

The paper reviews population sizes and trends over time, if known, for each group, ranging from millions of ringed seals to fewer than a hundred beluga whales in Northern Canada's Ungava Bay.

In the case of Arctic whales, the changes in sea ice might benefit their populations, at least in the short term: the loss and earlier retreat of sea ice opens up new habitats and, in some areas of the Arctic, has also led to an increase in food production and the length of their feeding seasoIn the case of Arctic whales, the changes in sea ice might benefit their populations, at least in the short term: the loss and earlier retreat of sea ice opens up new habitats and, in some areas of the Arctic, has also led to an increase in food production and the length of their feeding seasoin sea ice might benefit their populations, at least in the short term: the loss and earlier retreat of sea ice opens up new habitats and, in some areas of the Arctic, has also led to an increase in food production and the length of their feeding seasoin the short term: the loss and earlier retreat of sea ice opens up new habitats and, in some areas of the Arctic, has also led to an increase in food production and the length of their feeding seasoin some areas of the Arctic, has also led to an increase in food production and the length of their feeding seasoin food production and the length of their feeding season.

To dive deeper into that issue, researchers examined 43 years» worth of demographic data on two populations of killer whales in the Pacific Northwest.

«In light of our finding, current populations of humpback or fin whales are far from harvestable,» he says.

Norway will itself update its population estimates in July with a «sighting survey», an approved method of extrapolating whale populations from the number spotted from ships.

Roman and his colleagues modeled how that conveyer belt of nutrients has slowed due to the huge declines in whale, seabird and fish populations.