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Alpha Diversity Indices



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Alpha Diversity Indices James A Danoff Burg Dept Ecol Evol Envir Biol Columbia University Alpha Diversity Indices Q Statistic Intro to Alpha Diversity Indices Simpson McIntosh Berger Parker Shannon Wiener Brillouin Jack Knifing Diversity Indices Pielou s Hierarchical Diversity Index Lecture 4 Alpha Diversity Indices Week 1 Week 2 2003 Dr James A Danoff Burg jd363 columbia edu Diversity of Diversities Difference between the diversities is usually one of relative emphasis of two main envir aspects Two key features Richness Abundance our emphasis today Each index differs in the mathematical method of relating these features One is often given greater prominence than the other Formulae significantly differ between indices Lecture 4 Alpha Diversity Indices 2003 Dr James A Danoff Burg jd363 columbia edu Diversity Levels Progress from local to regional levels Point diversity at a single point or microenvironment Our emphasis thus far Alpha within habitat diversity Usually consists of several subsamples in a habitat Beta species diversity along transects gradients High Beta indicates number of spp increases rapidly with additional sampling sites along the gradient Gamma diversity of a larger geographical unit island Epsilon regional diversity Lecture 4 Alpha Diversity Indices 2003 Dr James A Danoff Burg jd363 columbia edu Q Statistic Introduction A bridge between the abundance models diversity indices Does not involve fitting a model as in the abundance models Provides an indication of community diversity No weighting towards very abundant or rare species They are excluded from the analysis Whittaker 1972 created earlier analysis including these Thereby more influenced by the few rare abundant species Proposed by Kempton Taylor 1976 Lecture 4 Alpha Diversity Indices 2003 Dr James A Danoff Burg jd363 columbia edu Q Statistic Visually Measures inter quartile slope on the cumulative species abundance curve S 250 S 4 62 5 250 200 R2 187 5 0 75 S 1st 62 5 2nd 125 3rd 187 5



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