Killer Whales: The Natural History and Genealogy of Orcinus by Kenneth C. Ford John Graeme M.; Balcomb

By Kenneth C. Ford John Graeme M.; Balcomb

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Additional info for Killer Whales: The Natural History and Genealogy of Orcinus Orca in British Columbia and Washington

Example text

Whales from Kl and LI pods were recently encountered by our colleague, Nancy Black, in Monterey Bay, California, on 29 January 2000. This is the first sighting of residents in waters south of Washington. The known range of the southern residents overlaps with that of the northern residents in the waters off both the west, east, and north coasts of Vancouver Island. For example, both northern and southern residents have been observed in the central Strait of Georgia near Nanaimo, offshore of Barkley Sound on the west coast of Vancouver Island, and in Juan de Fuca Strait.

Travelling whales tend to move at speeds of 5 knots or more, compared to the more leisurely pace of 2-3 knots exhibited during foraging. It is not uncommon for a rapidly travelling group to surface and dive in unison, or for individuals to clear the water's surface as they come up to breathe. Travelling seems to be simply a means of transiting an area, perhaps to move from one good feeding spot to another. In western Johnstone Strait, travelling activity is fairly uncommon, apparently because the foraging routine of the whales in the area is confined to a small area.

Members of the community are most commonly seen during the months of June through October in the area of western Johnstone Strait and Queen Charlotte Strait, off northeastern Vancouver Island. It is in this region that salmon funnel into narrow channels on their way to spawning rivers, and the whales congregate here to intercept them. Whale researchers also tend to congregate in Johnstone Strait during summer, and, as a result, we know little of the whereabouts of whales outside of this area and season.

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