Large gulls such as the Herring Gull (Larus argentatus) and the Greater Black Backed Gull (Larus marinus) have long been considered negative influences on alcids, including the Black Guillemot (Cepphus grylle). Great Duck Island—a seabird nesting island off the coast of Maine—not only provides nesting sites to approximately 50 pairs of Black Backed Gulls and 1200 pairs of Herring Gulls, but also to an estimated 400 pairs of Black Guillemots. Our study compares the nest locations of gulls and guillemots on the island, in order to determine whether the presence of gulls affects the nesting distribution of the Black Guillemot.

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