Turnover and Ecological Release in the Avifauna of Mona Island, Puerto Rico
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چکیده
Mor)• biogeographic theory states that the number of species in a class or other large taxonomic unit that inhabits an island is maintained within narrow bounds by a dynamic steady state between colonization and extinction s (MacArthur and Wilson 1967). Although a recent experimental test of the theory upheld most of its expectations (Simberloff and Wilson 1969), there remains a paucity of data on natural colonization and extinction rates from which to judge the time scale of faunal turnover on islands of varying geographic status. Two previous studies of avifaunal turnover on islands have come to our attention, one involving the California Channel Islands (Diamond 1969) and the other, Karkar, a volcanic island off the north coast of New Guinea (Diamond 1971c). Here we report on changes in the birdlife of Mona Island that have transpired since the turn of the century. Mona is especially well suited for the measurement of turnover for a number of reasons: its
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