Changes in seabird populations breeding on Small Island, Wadham Islands, Newfoundland / Gregory J. Robertson and Richard D. Elliot. : CW69-5/381E-PDF

"Numbers of breeding seabirds on Small Island, in the Wad ham Islands, off the northeastern coast of Newfoundland, were estimated in July 2001. Based on hole counts and their occupancy rates an estimated 6 190 ± 355 (5 453 - 6 939; 95% CI) pairs of Atlantic Puffin (Fratercula arctica) bred on Small Island in 2001; a reduction of 59% since 1984. Based on the densities of occupied burrows and the total occupied area, an estimated 1 038 ± 255 (506 - 1 571; 95% CI) pairs of Leach's Storm-petrel (Oceanodroma leucorhoa) bred in 2001; a 92% reduction since 1984. The appearance of a small Great Black-backed Gull (Larus marinus) colony on this island in the early1980s may explain the reduction in petrels and puffins. In contrast, Razorbills (Alcatorda) increased dramatically from 15 pairs breeding in 1984 to a minimum of 194 breeding in 2001. Razorbills are not susceptible to predation by gulls, and, as with Razorbill populations elsewhere, the population has increased on Small Island"--Summary, p. iii.

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