38 - 12/1/10 Endangered Species Act, 1. The basic law(s)....

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1 Lecture 38 Endangered Species Act , cont’d. 1. The basic law(s ). 2. Definitions. 3. Process of listing a species. 4. Facts about listed species. 5. Common criticisms 6. Proposed changes Evidence • Analysis of 492 species proposed for listing from 1985-1991. –80% listed at level of full species. –18% listed at subspecies level. –2% listed as “significant populations.” WILCOVE, D. et al. 1993. What exactly is an endangered species? Conservation Biology 7:87-94. Charismatic megafauna 2. Species really not so rare Evidence • At time of listing decision: Vertebrates: Mean total population size = 1075 Mean # populations = 2 Plants: Mean total population size = 120 Mean # populations = 4 (Same Wilcove et al. 1993 paper) 3. Too inflexible • Endangered species always come first. • Complaint basically true. • Some signs of flexibility: –Ability to list just populations. –“God squad” = cabinet level committee
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38 - 12/1/10 Endangered Species Act, 1. The basic law(s)....

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