Abstract
Crumpacker et al. (1988) presented a case for using the representation of potential natural vegetation (PNV) types (Kuchler 1964) on federal and Indian lands to identify unprotected natural ecosystems. We agree that a systems-level strategy is the most practical way to preserve biological diversity (Scott et al. 1987). The current emphasis on the recovery of endangered species and communities focuses limited conservation funding on a few of Earth's 30,000,000 species. The rate of habitat loss, especially in the tropics, has driven the extinction rate to unprecedented levels. The cost of reacting to these increasingly numerous crises already exceeds the global conservation budget. A number of authors (Ehrlich & Ehrlich 1981; Hutto et al. 1987; Scott et al. 1988; Norton 1988) have pointed out that saving groups of species in self-maintaining ecosystems offers a
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