Sentences with phrase «whale populations over»

The partial recovery of a few whale populations over the past 30 years can not be responsible for the decline in fisheries worldwide.

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.

Not exact matches

Researchers identified the unique feeding pattern by studying food availability and the whales» population over the past 120,000 years.

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.

«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 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.

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].

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.

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.

That episode rekindled debate over what should be done to reduce threats to the estimated 2,000 blue whales of an overall global population of 10,000 that feed off California each summer.

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.

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.

«The gray whale population has gotten bigger over the last 20 years and the killer whales have gotten better at hunting the gray whale calves,» she said.

«We have typically counted births and deaths to assess population status, but photogrammetry gives us a new tool to better assess the whales» condition between years and to look for changes over the course of the year,» said NOAA's Lynne Barre.

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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.

Had such catch levels continued, more than 360,000 whales would have been killed over the last 30 years — however, that might not have been the case because populations may have crashed, and demand for products was reducing.

Whale Fact: Pre-whaling population estimates were over 350,000 blue whales, but up to 99 % of blue whales were killed during whaling efforts.

Genetic analyses refute the hypothesis that an overly abundant population of minke whales is creating too much competition over food for populations of other whale species to rebound, according to a new study supported by...