Abstract
The equilibrium theory of island biogeography proposes that the number of species on an island is the result of a dynamic equilibrium between immigration and extinction. Annual surveys of an island's fauna are the most direct evidence bearing on the theory, which predicts that while species number will remain nearly constant, species composition will change. We surveyed the land birds of Guana Island, British Virgin Islands, a small tropical island (299ha; 64°30'W l8°28'N), each year from 1984 through 1990. Earlier surveys of the island's birds were made in 1954 and 1976
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