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When biodiversity is examined in the context of species richness, a consistent feature emerges: Most taxonomic groups are species-poor, relatively few are species-rich, and the frequency distribution has the shape of a so-called “hollow curve” ([ 1 ][1], [ 2 ][2]) ([Fig. 1A][3]). ![ Fig. 1. ][
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Scotland et al. (2004) studied this question.
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