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1 March 2011 Bald Eagle Population Surveys of the North Pacific Ocean, 1967–2010
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Abstract

Bald Eagle (Haliaeetus leucocephalus) populations along the north Pacific coast from southern British Columbia to the Alaska Peninsula have been monitored since 1967 with aerial surveys using a universal random plot design. This survey consisted of 233 plots, each 168.3 km2. The expanded population estimate for adults totaled 58,000 after applying a visibility correction factor of 2.0. This accounted for roughly half of the world's population. With multiple surveys, I determined that populations in southeast Alaska, Prince William Sound, and the Alaska Peninsula increased until the late 1980s and remained stable thereafter. All possible plots, under this survey design, can be delineated for future replication or modification using 2 simple equations.

John I. Hodges "Bald Eagle Population Surveys of the North Pacific Ocean, 1967–2010," Northwestern Naturalist 92(1), 7-12, (1 March 2011). https://doi.org/10.1898/10-03.1
Received: 29 January 2010; Accepted: 1 September 2010; Published: 1 March 2011
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