Jones and Stokes Associates "Sliding Toward Extinction: The State of California's Natural Heritage", 1987

Natural diversity, as used in this report, is synonymous with biological diversity... To the scientist, natural diversity has a variety of meanings. These include: 1) the number of different native species and individuals in a habitat or geographical area; 2) the variety of different habitats within an area; 3) the variety of interactions that occur between different species in a habitat; and 4) the range of genetic variation among individuals within a species.

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