The distribution of the Pacific subspecies of great blue heron, Ardea herodias fannini, is confined to the Pacific coast of North America from Prince William Sound, Alaska, south to Puget Sound, Washington, where it resides year-round. About 4,000–5,000 pairs are estimated to occupy this range, of which about 2,000 reside in British Columbia. There are about 20–30 colonies of herons around the Strait of Georgia and about 80% of the herons nest in 4 colonies near urban areas. The Strait of Georgia population has declined about 3–5% per year since the 1960s. The decline is thought to be a consequence of delayed and failed breeding arising from disturbance by humans and bald eagles (Haliaeetus leucocephalus).
Butler, Robert W., Baudin, Philip D.. 1999. Status and Conservation Stewardship of the Pacific Great Blue Heron in Canada (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks; University College of the Cariboo. Proceedings - Conference Biology & Management
Topic: Species and Ecosystems at Risk
Keywords: Ardea herodias fannini, great blue heron, population trend, status, Strait of Georgia
Scientific Name: Ardea herodias
English Name: Great Blue Heron
Other Identifier: University College of the Cariboo
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