Shannon's and Simpson's Indexes

Shannon's and Simpson's Indexes - Shannon’s H Has similar...

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More information on Shannon’s H and Simpson’s D : Simpson’s D : For a given species richness, D increases as species become more equitable. For a given equitability, D increases with increasing species richness. An example of a study that used Simpson’s D to look at diversity is one by Johnson & Agrawal (2005, Ecology). In their study, they looked for effects of genotypic diversity in the plant evening primrose ( Oenothera biennis) on arthropod diversity, as measured by Simpson’s diversity index. Their results are shown below. Each line shows the diversity of arthropods on a given plant genotype in each of five different habitats, and gives you an idea of the range of values of Simpson’s D that is observed in natural systems (as opposed to the made-up example we used in class).
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Unformatted text preview: Shannon’s H : Has similar properties to Simpson’s D , but the range of values differs. An example of a study that uses Shannon’s H is one by Foster et al. (2002, Oikos). This study looked at starting diversity in Kansas grassland communities and how that correlated with standing crop, light penetration and disturbance, as shown in the figure below. Note that the range of values of H is different than the range in values in D that was observed in the Johnson & Agrawal study. This is typical of these indices. You may have also noticed that they call this the “Shannon-Weiner” index in the figure legend. This index is alternately called Shannon’s index, the Shannon-Weiner index, or the Shannon-Weaver index. All of them refer to the same thing....
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This note was uploaded on 03/13/2011 for the course BIO 2344 taught by Professor Brockett during the Spring '00 term at Georgia Tech.

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Shannon's and Simpson's Indexes - Shannon’s H Has similar...

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