Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Species richness is the number of different species in a given area. It is represented in equation form as S. Species richness is the fundamental unit in which to assess the homogeneity of an environment. Typically, species richness is used in conservation studies to determine the sensitivity of ecosystems and their resident species. The actual number of species calculated alone is largely an arbitrary number. These studies, therefore, often develop a rubric or measure for valuing the species richness number(s) or adopt one from previous studies on similar ecosystems.
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