Gannets (Sula bassana) on Noss, Shetland, with an Analysis of the Rate of Increase of This Species

Abstract
An increase from 1 pair in 1914 to 1,518 breeding pairs in 1938 is noted. This rapid increase is largely due to new colonization from the outside, which lasted until, at least, 1935. A supposition is made that gannets first breed 4 years after hatching. Gannets prevent guillemots (Uria aalge) from nesting within "beak range" of their own nests.

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