Trophic Levels and Turnover Rates: The Avifauna of Santa Barbara Island, California

摘要: Author(s): Hunt, GL; MW | Abstract: With the study of equilibrium theory island biogeography pioneered by MacArthur and Wilson ( 1963, 1967), increasing attention has been paid to turnover rates (Mayr 1965; Diamond 1969, 1971; Power 1972; Terborgh Faaberg 1973). The failure bird species show predicted negative correlation with size in California Channel Islands (Diamond 1969) raises questions as what factors other than may be involved determining turnover. · Previous studies avifaunal have treated faunas a whole not differentiated for rare from those common species. Since very large birds at high levels on food chain often exist relatively low densities, these organisms would expected greater probability extinction small islands which maintain larger populations (Brown 1971). A theoretical basis this hypothesis can derived Gilpin 197 4). He shown pers. comm.) that should exponential function K, thus sensitive population size.