Island Extinction Rates from Regular Censuses |
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| Authors: | Michael L Rosenzweig Colin W Clark |
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| Institution: | Department of Ecology and Evolutionary Biology University of Arizona Tucson, AZ 85721, U. S. A.Institute of Applied Mathematics University of British Columbia Vancouver, BC V6T 1Z2, Canada |
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| Abstract: | Regular censuses conducted over a long time allow the calculation of both extinction and immigration rates. We present formulae for estimation of those rates. We use them on bird censuses of three British islands. These formulae improve on previous estimators of extinction but reaffirm that smaller populations have a higher probability of becoming extinct. On the other hand, they suggest no correlation between extinction rate and either body size or migratory status among birds. |
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