Sentences with phrase «whale populations from»

No Direct Competition For Food This new genetic analysis however shows that «direct competition for food is not keeping the large whale populations from recovering.»

Failure to account for the effects of climate change on these dynamics will undermine our ability to understand changes in the standing biomass of Antarctic krill and also to predict the recovery of whale populations from a century of mismanagement and overexploitation [37].

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.

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.

The old estimates were based on 20th - century data from the whaling industry itself, which estimated a worldwide sperm - whale population of about 1.8 million, a number that few scientists found credible.

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.

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.

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 environment.

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.

«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.

The occasional genetic interchange between populations also seemed to correlate with feeding grounds with high densities of krill, places where whales from different populations are likely to move vast distances and come into contact with other populations.

But adaptation takes time, and the whale's population has already dipped from roughly 26,000 to 17,000.

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.

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.

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

Researchers determined the whales» current population numbers by comparing photographic shots of humpbacks in their North Pacific feeding grounds (around the Pacific Rim from California to Kamchatka) to images taken of the whales in their southern, tropical breeding areas — some as far as 3000 miles away.

Their analysis indicated that «any removal of belugas from that population is not sustainable,» Payne says, because it adds yet another threat to the many that the whales already face.

But with bowheads, which are slowly recovering from intense whaling in the 19th century, conservations groups would be highly motivated to buy all the shares for 13 years, until the population grows to the carrying capacity.

The authors point out that the findings support previous observations of individual male whales moving between populations in different ocean basins, and that subpopulations from both regions could share the same feeding ground in Antarctic waters.

Using data generated from more than 3,000 skin samples from individual whales ranging from the South Atlantic to the Indian Oceans, the research team has uncovered previously unknown degrees of relatedness between different whale populations.

Already, northern right whales have a Potential Biological Removal (PBR) of less than 1, the number that can safely be removed from their population each year by human causes.

Furthermore, we must understand how changes in sea ice cover affect the feeding ecology of humpback whales and their competitors in the short - term and the dynamics of krill populations over the longer term, particularly given the increasing pressure from commercial krill harvests [36].

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

Also, why did traditional Eskimo populations, consuming up to 75 % of their total caloric intake from fat (mostly from whale blubber, seal fat, organ meats, and cold water fish), display superior health and longevity without heart disease or obesity?

Erzya and Moksha Mordvins; Total population; 843,350 (2002) Regions with significant populations; Mordovia, Ryazan Oblast, Ulyanovsk Oblast, Samara Oblast Diana Kuznetsova, 16, died after jumping from a nine storey building in Ryazan (Image: East2West) The lethal game called Blue Whale involves an

Every year at the start of Fall more than 60 % of the North Pacific Humpback Whale population will begin their migration from Alaska to Hawaii, with many of them choosing to stay in the waters off of Maui during their visit.

While there I head underwater to check out the local population of manta rays, whale sharks, and coral life; meet up with some new friends who make their living selling art in town; and recuperate from a bout of malaria I unfortunately caught while there.

In this video I head underwater to check out the local population of manta rays, whale sharks, and coral life; meet up with some new friends who make their living selling art in town; and recuperate from a bout of malaria I unfortunately caught while there.

Just over an hour's drive from PE it is home to one of the densest African elephant populations on earth, but also lays claim to Africa's Big 7, including the southern right whale and great white shark.

One key concern from environmental groups is that the Sakhalin - 2 project will harm the western gray whale population.

Cascadia Research senior biologist John Calambokidis discussed his work examining the trends of populations of blue, fin, humpback, and gray whales in southern California during the July From Shore to Sea lecture.

They state that «the most recent population estimate [from 2007] was approximately 19,000 whales, with a high probability (88 %) that the population is at «optimum sustainable population» size, as defined by the Marine Mammal Protection Act.

There is also a western North Pacific population of gray whales found along the coast of eastern Asia that is totally isolated from the eastern North Pacific population.

Research biologist, John Calambokidis, discused his work tracking the movements and estimating the populations of blue and humpback whales in the North Pacific at the May «From Shore to Sea» lecture.

[19][20] Although identity between the Atlantic and Pacific populations can not be proven by anatomical data, its skeleton is distinctive and easy to distinguish from that of all other living whales.

A population of about 200 gray whales stay along the eastern Pacific coast from Canada to California throughout the summer, not making the farther trip to Alaskan waters.

Over the last decade, dozens of collisions have seriously injured or killed whales off the California coast, and scientists think the population of about 2,500 blue whales that migrates along the West Coast each year may be especially at risk from ship strikes.

Jim Lecky, director of the Office of Protected Resources for the National Oceanic and Atmospheric Administration fisheries service, said blue whales do not face imminent danger as a population and that their numbers are slowly increasing from year to year.

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

Thanks to the Endangered Species Act, the humpback whale population has grown in the last 20 years from 6,000 whales in the North Pacific Ocean, with 4,000 coming to Hawaii, to more than 21,000 whales existing today with approximately 10,000 traveling to Hawaii each year.

Additionally, from December to April, the massive Humpback Whales join the local population to make Kona unbelievably magical.

Many whale biologists believe their population is now at 10 % of historical levels, having bounced back from a mere 1 % at their nadir less than fifty years ago.

Each winter, the East Australian humpback whale population migrate north from the Antarctic waters, along the eastern coastline of Australia to mate and give birth in the warmer waters of North Queensland.

The coastal population of minke whales from California through Washington is estimated at only 600-1000 individuals.

This is probably the world's only sedentary population of Humpback Whales, as over the last 70,000 years it separated from the rest of the Indian Ocean population and settled in Oman's waters.

By Al Zagofsky - Special to the Times News of Carbon County Pennsylvania April 17, 2004 petting whale Since whaling was banned in 1946, the California Gray Whale population has rebounded from near extinction to a population that has been estimated to be as high as 27whale Since whaling was banned in 1946, the California Gray Whale population has rebounded from near extinction to a population that has been estimated to be as high as 27Whale population has rebounded from near extinction to a population that has been estimated to be as high as 27,000.