Patrick J. Gould 1983 <p><span>Seabirds were observed between Alaska and Hawaii along 158°W longitude from 24 October to 6 November 1976. Their distributions and abundances corresponded remarkably well to oceanographic regions. Indices of seabird density dropped in a series of plateaus from 44 birds/km</span>²<span> in the Alaska Current System to less than 1 bird/km</span>²<span> in subtropic waters. Northern distribution records were found for six species. The Subarctic Boundary marked the center of the separation between subarctic and subtropic pelagic avifaunas.</span></p> application/pdf 10.2307/1367061 en Cooper Ornithological Society Seabirds between Alaska and Hawaii article