Sentences with phrase «whale population numbers»

The current gray whale population numbers 21,000.

In 2007, the US submitted a «field report» to the International Whaling Commission Scientific Committee asserting the Gray whale population numbered approximately 18,000.

Not exact matches

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.

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.

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.

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.

The earlier study also compared shark population numbers with other apex predators, such as polar bears and killer whales.

Without ship strikes as a big factor holding the population back — and no other readily apparent human - caused reason (although noise, chemical pollution and interactions with fisheries may impact them)-- it is even more likely that the population is growing more slowly because whale numbers are reaching the habitat limit, something called the carrying capacity.

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.

Populations globally remain at a fraction of their former numbers prior to whaling, and they appear regularly off the southern California coast, where they feed,» said John Calambokidis, one of the projectâ $ ™ s lead investigators of Cascadia Research.

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.

«After 50 years of international protection, a number of humpback whale populations are beginning to recover in the Southern Hemisphere and other regions,» said Dr. Howard Rosenbaum of WCS's Ocean Giants Program.

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.

As of 2012, both the East and West Coast whale populations had more than 63 % (East Coast) and 90 % (West Coast) of the number of whales estimated in each population before the whaling era (approximately 1912 - 1972).

Following the prohibition of commercial whaling, this population rebounded and now likely numbers more than 10,000 whales.

Canada worked hard to create the Right Whale Recovery Plan, and our federal government must take decisive action to protect this population before we again start seeing a downward trend in their numbers.

The Californian Gray whale population is around 26,000, and is now at the point where there are surplus numbers which could be transferred to the waters off Britain.

The North Island Kayak Four Day Orcas and the Humpbacks Sea Kayaking Adventure concentrates on the areas known to be the primary summer range of Northern Resident Orca (killer whale) population and the summer feeding grounds of an ever increasing number of Humpback Whales.

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 drop in population made it no longer profitable to hunt gray whales; they were left alone and their numbers recovered.

When you consider the annual number of deaths for the entire gray whale population, this really isn't an alarming number of deaths.

Because of the considerable scientific uncertainty over the numbers of whales of different species and in different geographical stocks, the International Whaling Commission decided in 1989 that it would be better not to give whale population figures except for those species / stocks which have been assessed in some detail.

This prediction is of interest because haplotype richness can be used in population dynamic modeling to inform a lower boundary on the minimum number of whales (Nmin) that survived the exploitation bottleneck caused by commercial whaling [18].

Scientists fear melting sea ice could one day make killer whales the Hudson Bay's top predator, a startling ecosystem shift and a blow for Inuit populations already reeling from dwindling polar bear numbers.

Yet, in its early attempts to regulate whaling, the IWC did nothing more than sanction whaling, even when the numbers of whales killed were clearly jeopardizing populations.

A number of scientists have proposed that western and eastern gray whale populations are not isolated and that the gray whales found in Russian waters are a part of an eastern population that is restoring its former range.

This leads to a number of ship and whale collisions every year that harm the population of gentle giants.