Sentences with phrase «whale predation»

We are recruiting helpers for two periods; - late August to mid December: focus is elephant seal breeding, killer whale predation on weaned elephant seal pups, establishment of pairs and territories by skuas - mid December to late March: focus is elephant seal moulting, genaral killer whale activity and behavior, intensive study of skuas behaviour and communication, monitoring of breeding of marine birds and raptors, collection of general environmental data Only applicants who can stay for a whole period (about 3 months and a half) can be taken into consideration.

We are reasonably certain that killer - whale predation dramatically reduced sea otter numbers in southwestern Alaska, and we know that it could easily account for the seal and sea lion declines.

Our recently published paper attributing the pinniped declines to killer - whale predation provides an alternative hypothesis that we believe is more consistent with the available data.

In addition, a global theory of killer whale predation depends on educated — and far - flung — guesses of how many marine mammals may have been killed by orcas over a set period of time.

For the cascade theory of killer whale predation to stand up, there needs to be evidence that transient orcas, given the chance, would eat a whole lot of whale.

Not exact matches

According to a new theory of predation — published late last year in the Proceedings of the National Academy of Sciences (PNAS)-- humans sharply reduced the orcas» main source of food in the 1950s with the postwar explosion of industrial whaling.

Estes says that some of the opposition to his theory about marine mammal predation derives less from the behavior of killer whales than from the behavior — and beliefs — of human beings.

Pegging the trend toward giant sizes to the Plio - Pleistocene ruled out other hypotheses such as the threat of predation by the huge shark megalodon — which had already been around for millions of years before the whales» growth spurt — or the advent of filter feeding, which had been around for more than 15 million years at that point.

Poster on killer whale sociality during predation events, to be presented at the next meeting of the Italian Zoologist Union (PDF file)

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

As with so many issues impacting the Gray Whale, Orca predation is in the too hard basket.

The California Gray Whale Coalition can find no evidence to suggest that the US Government takes into account the very high mortality rates caused by Orca predation.

Now that man has killed a majority of the whale filter feeders there is little predation to keep this feed back at bay.

Tagged Arctic, baffin bay, beluga, climate, climate change, Clint Wright, Disko Bay, entrapment, facts, global warming, narwhal, polar bear, Pond Inlet, predation, prey, risk, sea ice, threatened, trapped, unicorn, Vancouver Aquarium, weather, whales