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8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 52 and pi is the proportion of the ith species. The function was used as a measure of species diversity by MacArthur and MacArthur (1961). A readable account of its derivation and properties is given by Quast- ler (1956). The function takes into… … Fig. 4— H(S) values for the living (top number) and total (bottom number) populations in April 1965 ( 0=only 1 species present; - —no foraminifers ; paired numbers— replicates) .
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