Species diversity refers to the variety of species within a region.
Species are distinct units of diversity, each playing a specific role in an ecosystem. There fore. loss of species has consequences for the ecosystem as a whole.
The simples measure of species diversity i richness, ie the number of species per unit area. Generally, greater the species richness, greater is the species diversity However, number of individuals among the species may also vary, resulting into differen- ces in evenness, or equitability and con- sequently in diversity.
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