Sentences with phrase «whale population size»

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.

Not exact matches

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.

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.

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.

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.

It even reveals how population sizes of whales have changed during the last million years», summarizes Janke.

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.

Stable isotope results show only very slight differences between ancient and modern whales, indicating the hypothesis of population substructure in the past around the area of the Olympic peninsula / Vancouver Island remains a possibility and warrants further investigation using larger sample sizes.

The IWC Bowhead, Right and Gray Whale subcommittee in 2011 reiterated the conservation risk to western gray whales is large because of the small size of the population and the potential anthropogenic impacts.

Our results agree with previous genetic studies suggesting the historical size of the eastern gray whale population was roughly three to five times its current size.

Further south, in the Gulf of California, WWF supports a research team that is monitoring the population size and health of the gray whales that return each winter.

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.

Compared with other bodies of water its size, the Sea of Cortez supports the largest and most varied population of whales in the world: humpback, Bryde's, minke, orca, and sperm whales also live there.

We used sequence variation in the mitochondrial COI gene to ask (i) whether cyamid population structures might reveal associations among right whale individuals and subpopulations, (ii) whether the divergences of the three nominally conspecific cyamid species on North Atlantic, North Pacific, and southern right whales (Euba.laena glac.ialis, Eubal.aena jap.onica, Euba.laena aust.ralis) might indicate their times of separation, and (iii) whether the shapes of cyamid gene trees might contain information about changes in the population sizes of right whales....

While the International Union for Conservation of Nature lists the giant — second in size behind blue whales — as endangered, regional populations, including the fin population off Iceland, are healthy.

«an in - depth evaluation of the status of all whale stocks in the light of management objectives and procedures... that... would include the examination of current stock size, recent population trends, carrying capacity and productivity».

Although LeDuc et al. [15] did not consider their sample size to be sufficient for an analysis of geographic structure in the Antarctic blue whale, they were able to report the first estimate of mtDNA diversity in the population and a minimum census of 26 haplotypes among 46 individuals.