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Endangered Species Act provisions appear to benefit imperiled organisms

An analysis of the conservation status of 1095 species that have been protected under the US Endangered Species Act (ESA) indicates that those that have been given more protection under the act are more likely to be improving in status and less likely to be declining than species given less protection. The study, "The Effectiveness of the Endangered Species Act: A Quantitative Analysis," by Martin F. J. Taylor, Kieran F. Suckling, and Jeffrey J. Rachlinski, affirms the effectiveness of some controversial aspects of the act for conservation. The results could inform various efforts now under way in Congress to amend the act.

The study finds that the longer species were listed under the act, the more likely they were to be improving in status and the less likely to be declining, suggesting ESA conservation measures act cumulatively over time. Separately, species for which "critical habitat" had been designated for two or more years appeared more likely to be improving and less likely to be declining than species that did not have critical habitat for at least two years. Likewise, species that had recovery plans for two or more years appeared more likely to be improving and less likely to be declining than others, and species with dedicated recovery plans appeared to fare better than species protected by multi-species recovery plans. Other protections afforded by the ESA, such as protection of individual animals from unregulated "take," also had apparently beneficial effects on species' conservation status. The benefits of ESA protections did not appear to favor animals over plants. Taylor and his coauthors urge that the $153 million estimated cost to complete work on the backlog of ESA listings and critical habitat designations be fully funded, and endorse a recommendation that the recovery program budget be increased by $300 million.


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Contact: Donna Royston
droyston@aibs.org
202-628-1500 261
American Institute of Biological Sciences
1-Apr-2005


Page: 1

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