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Turnover Rates in Insular Biogeography: Effect of Immigration on Extinction
Author(s) -
Brown James H.,
Kodric-Brown Astrid
Publication year - 1977
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.2307/1935620
Subject(s) - extinction (optical mineralogy) , ecology , insular biogeography , biogeography , immigration , biological dispersal , biology , geography , demography , population , paleontology , sociology , archaeology
Demographic and genetic contributions from conspecific immigrants tend to reduce extinction rates of insular populations. The MacArthur—Wilson model of island biogeography is modified to provide for this effect of immigration on extinction, which we call the rescue effect. This new model predicts that when immigration rates are high relative to extinction rates, turnover rate is directly related to the distance between an island and the source of colonizing species. A field study of the distribution of arthropods among isolated plants supports the model.