Abstract
The familiar dynamic equilibrium theory of island biogeography (MacArthur and Wilson 1967) predicts that the equilibrial number of species on an island is a function of rates of immigration and extinction, which in turn are dependent on area and distance from a source of colonizers. A large island would tend to have greater habitat diversity supporting more species and would tend to have larger populations less prone to extinction than would a small island. Likewise, an island that is farther from a source of propagules is likely to have a reduced immigration rate of new species and hence a lower equilibrial species number than an island close to a source of colonizers.
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