Sentences with phrase «on whale populations»

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.

Not exact matches

«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.»

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.

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.

Meanwhile, populations of certain species of Antarctic penguins such as the Adélie are dwindling, and Antarctic krill — the tiny crustaceans that feed whales and many other animals — are also on the decline.

«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.

The genetic data also revealed that the Antarctic minke whale population may be the oldest surviving whale population on Earth.

Finally, the team calculated that the dozen observed killer whale attacks on otters, extrapolated to the general population, could account entirely for the observed declines.

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.

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.

The research results build on previous regional studies of genetic diversity and will help scientists to better understand how humpback whale populations evolve over time and how to best advise international management authorities.

The International Whaling Commission calculates natural population sizes based on analysis of the logbooks of whaling captains and other historicaWhaling Commission calculates natural population sizes based on analysis of the logbooks of whaling captains and other historicawhaling captains and other historical data.

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

The new estimates suggest that proposals to lift the International Whaling Commission's 18 - year - old moratorium on commercial whaling are based on a faulty assessment of what constitutes natural populationWhaling Commission's 18 - year - old moratorium on commercial whaling are based on a faulty assessment of what constitutes natural populationwhaling are based on a faulty assessment of what constitutes natural population sizes.

The study highlights the need for more research on whale sharks as well as a multinational, cooperative effort to conserve populations in both the Red Sea and Indian Ocean.

In the largest study on the genetics of whale sharks conducted to date, researchers found that the world's biggest fish likely exist in 2 distinct populations with minimal connectivity between the Indo - Pacific and the Atlantic Ocean.

A massive genetic study of humpback whale populations will help inform ongoing conservation reassessments of humpback whale populations, and reaffirms the highly distinct nature of a small, non-migratory population of humpback whales living in the Arabian Sea in need on continued protection.

«Insights on whale shark populations and evidence for their historic rise, recent decline.»

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].

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

As a result, understanding changes in population size for social species — several of which, such as African wild dogs and southern resident killer whales, are endangered — requires understanding of what goes on within groups and how individuals fare when they strike out on their own.

We found that PCBs were at excessively high concentrations in the blubber of several marine apex predator species across Europe, including killer whales and bottlenose dolphins, and were associated with long - term and on - going population declines.

Most of the shore's meagre population — the Irish and West Country English and the bushborns of uncertain provenance — were camped on the grey sand, waiting to butcher a whale that had beached itself in the shallows on the feast day of St. Mark.

Prince Rupert is a marine city with a population of 15,000 that is situated on British Columbia's beautiful north coast — a place where eagle, bears and whales outnumber people.

Large quantities of ambergris nay have washed up on the shores of Ambergris Caye before intense whaling of the - 1800's and early 190O's decimated the sperm whale populations.

The future focus for field research will be to explore connections to populations of whale sharks found in more remote places on Earth.

An international ban on commercial whaling was instituted in 1964 and the whale population has since rebounded.

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.

Whale watching is a must on the south coast where the Blue Whale forms a distinct resident population.

Several whales seen off Sakhalin and on Kamchatka Peninsula are confirmed to migrate towards eastern side of Pacific and join the larger eastern population.

North Atlantic populations were extirpated (perhaps by whaling) on the European coast before AD 500 and on the American coast around the late 17th to early 18th centuries.

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.

Of particular interest is the possibility of a large population decline prior to whaling, as such a decline could explain the ∼ 5-fold difference between genetic estimates of prior abundance and estimates based on historical records.

The Gray Whale Census, an official Gray Whale migration census that has been recording data on the migration of the Pacific Gray Whale has been keeping track of the population of the Pacific Gray Whale since 1985.

Since that time the humpback population has made a remarkable comeback and we now see humpback whales almost every day on our kayak tours off northern Vancouver Island.

The North Island Kayak Three Day Orca Sea Kayaking Safari concentrates on the areas known to be the primary summer range of Northern Resident Orca (killer whale) population.

Dr. Mike Bigg and his colleagues were working to develop new techniques to study Killer Whales and would eventually conduct the first population census ever on these animals.

It provides breeding and feeding grounds for at least twenty - five endangered or threatened species; thirty - six marine mammal species, including blue, gray, and humpback whales, harbor seals, elephant seals, Pacific white - sided dolphins, and one of the southernmost U.S. populations of threatened Steller sea lions; over a quarter - million breeding seabirds; and one of the most significant white shark populations on the planet.

Some whale populations once on the brink of extinction, like blue whales, are beginning to recover.

Travel to the famed Khutzeymateen Provincial Park and view the resident grizzly and black bear populations in their natural environment or, depending on the season, take a whale - watching cruise and view orca whales, humpback whales, porpoises and seals.

«The unique location of the Sheraton Maui's Moana building, situated on top of the Black Rock, provides an unrivaled view of the Humpback Whales across the Maui Nui Basin where their population is amongst the highest,» continues Yamazaki.

Shore - based whaling stations near Victoria on Vancouver Island, using only row boats and hand - thrown harpoons, removed the entire population in less than a decade.

Our theory is that our large population of orca whales keeps great white sharks at bay, hence the title of this blog article «Orca Whales Prevent Shark Attacks on Kayaks in the San Juan Islands&rwhales keeps great white sharks at bay, hence the title of this blog article «Orca Whales Prevent Shark Attacks on Kayaks in the San Juan Islands&rWhales Prevent Shark Attacks on Kayaks in the San Juan Islands».

Research on minke whale populations off the Queensland coast show they have a complex language with a rich vocabulary.

Once the center of the sardine packing industry, today the small city on California's central coast is famous for its proximity to large populations of whales, seals, sea lions and sea otters as well...

The latest confirmed birth, recorded on February 21 in L - pod, brings the «southern resident» killer whale community population up to 89 whales.

The birth brings to 88 the population of southern resident killer whales that we enjoy seeing on our kayak tours in the San Juan Islands.

Blue whales can migrate big distances, but Sri Lanka's population tend to stick around for long periods in Mirissa on the south coast — with most sightings from November to April.

This years research on Whale Shark Populations along the coast of the Yucatan shows that the Largest aggregation of Whale Sharks in the World is off the coast of Isla Mujeres and about 18 miles north of Cancun.

However, what is critical is the extent of predation and what impacts are being visited on the Gray Whale population.