FACTORS AFFECTING SPECIES' RISK OF EXTINCTION: AN EMPIRICAL ANALYSIS OF ESA AND NATURESERVE LISTINGS

David N. Laband and Michael Nieswiadomy

Contemporary Economic Policy, 2006, vol. 24, issue 1, 160-171

Abstract: The authors examine the impact of environmental and political variables on two measures of species imperilment across 49 U.S. states: the fraction of all species in a state identified by NatureServe as being “at‐risk” of extinction, and the fraction of species in a state listed under the U.S. Fish & Wildlife Service's (FWS) Endangered Species Act (ESA). A highly significant determinant of both measures is the fraction of species endemic to the state. Population growth increases the at‐risk measure, but not the ESA listings. There is a significant concern for plant imperilment by NatureServe, but not by the FWS.

Date: 2006
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