Empirical Relationships between Species Richness, Evenness, and Proportional Diversity

The American Naturalist
G Stirling, B Wilsey

Abstract

Diversity (or biodiversity) is typically measured by a species count (richness) and sometimes with an evenness index; it may also be measured by a proportional statistic that combines both measures (e.g., Shannon-Weiner index or H'). These diversity measures are hypothesized to be positively and strongly correlated, but this null hypothesis has not been tested empirically. We used the results of Caswell's neutral model to generate null relationships between richness (S), evenness (J'), and proportional diversity (H'). We tested predictions of the null model against empirical relationships describing data in a literature survey and in four individual studies conducted across various scales. Empirical relationships between log S or J' and H' differed from the null model when <10 species were tested and in plants, vertebrates, and fungi. The empirical relationships were similar to the null model when >10 and <100 species were tested and in invertebrates. If >100 species were used to estimate diversity, the relation between log S and H' was negative. The strongest predictive models included log S and J'. A path analysis indicated that log S and J' were always negatively related, that empirical observations could not be explained wi...Continue Reading

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Citations

Mar 4, 2006·Oecologia·Heather F Sahli, Jeffrey K Conner
Jan 30, 2008·Proceedings of the National Academy of Sciences of the United States of America·Moriaki YasuharaBraddock K Linsley
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