Species richness has, arguably, become the common currency of studies of biodiversity (Gaston and Spicer, 1998). As is apparent from most of the multiple definitions of ‘bio-diversity ’ or ‘biological diversity ’ (see DeLong, 1996; Gaston, 1996a), this is but one measure amongst many. However, it acts as a reasonable surrogate for some of the other
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Kevin J. Gaston (2000) studied this question.