Correlations among nine indices of species diversity, HURLBERT's S
(100), ITOW's b, FISHER's α, three varieties of SIMPSON's d, MCINTOSH's index, SHANNON's H', and PIELOU's J', were studied using measurements taken in 57 forests, from the humid tropical to the humid warm-temperate regions of East Asia, Pacific islands and Amazonian upstream. The indices were categorized into two groups according to their correlations. In first group, consisting of S
(100), b, α and 1/d, values are sensitive to changes in species richness. (1-d), (1-d)/(1-d)
max, MCINTOSH's index, H' and J' belong to the second group. The indices studied showed intra-but not inter-group correlation. The number of species occurring once in the community is significantly correlated with FISHER's α.
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