Sentences with phrase «population of killer whales»

We've long speculated that the scarcity of sharks in the San Juan Islands is due to our concentrated population of killer whales.

STILL POLLUTED Some of Europe's fragile populations of killer whales and other dolphins still carry high concentrations of PCBs decades after the toxic substances were banned.

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

Not exact matches

Marine mammal toxicologist Peter Ross of the Vancouver Museum told Science News that he doesn't expect the chemicals to disappear from Pacific killer whales, another population in which the chemical contamination has been well documented, until the end of this century.

Despite the long gap since then, mean concentration of the chemicals in the blubber of some populations of Europe's killer whales exceeds — often by a lot — a high threshold for health damage.

• In the Northern Pacific and the southern Bering Sea, killer whales have been linked to collapsing populations of fur seals and harbor seals.

Estes calls the hunt the «first concrete and well - chronicled example of killer whales coming in and doing a significant amount of damage to a population.»

Though Estes can't prove it, he thinks the killer whales subsequently turned to other populations of marine mammals, first decimating seals and sea lions before doing the same to otters.

It is fundamental for evaluating the status of killer whale populations.

Some researchers think that a similar process is occurring in the killer whale populations of the Northeast Atlantic.

«Killer whales have been thought of by some as something like the poster child» for the process, «because there are multiple genetically distinct populations [which have not yet been formally described as separate species] with different prey preferences in the North Pacific and Antarctic,» says Phillip Morin, a cetacean biologist at the Southwest Fisheries Science Center in San Diego, California, who was not involved in the new study.

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.

The few remaining killer whale populations in European waters have very low, or zero rates of reproduction, and are close to extinction in industrialised parts of Europe.

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.

During the months of July through September, the Johnstone Strait has the largest population of Orcas (Killer Whales) in North America.

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.

British Columbia has the largest population of Orcas (Killer Whales) in the world so Canada whale watching tours in BC are a favourite for fans of the incredible Killer Wwhale watching tours in BC are a favourite for fans of the incredible Killer WhaleWhale.

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.

The Pacific - herring population collapsed after the spill, and one pod of killer whales had its population cut by 40 percent.

The menace of an oil spill from new Texas - bound tankers has nature - loving British Columbians rising up in opposition to expanded ocean traffic along the coast, that, amongst other environmental threats, endangers the killer whale population, the iconic Orcas.