Document Type

Article

Journal/Book Title/Conference

American Naturalist

Volume

172

Publisher

University of Chicago Press

Publication Date

2010

First Page

35

Last Page

43

Abstract

It is generally accepted that local species richness at a site reflects the combined influence of local and regional processes. However, most empirical studies evaluate the influence of either local environmental variables or regional enrichment but not both simultaneously. Here we demonstrate the importance of combining these processes to understand continental scale richness patterns in breeding birds. We show that neither regional enrichment nor the local environment in isolation is sufficient to characterize observed patterns of species richness. Combining both sets of variables into a single model results in improved model fit and the removal of residual spatial autocorrelation. At short time scales local processes are most important for determining local richness, but as the time scale of analysis increases regional enrichment becomes increasingly important. These results emphasize the need for increased integration of multiple scales of processes into models of species richness.

Comments

Published by the University of Chicago Press in the American Naturalist.

Publisher version available below:

http://www.jstor.org/stable/10.1086/649578

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