Male Timothy D, Bean Michael J
Environmental Defense, 1875 Connecticut Avenue, Washington, DC 20009, USA.
Ecol Lett. 2005 Sep;8(9):986-992. doi: 10.1111/j.1461-0248.2005.00806.x. Epub 2005 Aug 10.
Since passage of the Endangered Species Act in 1973, over 1300 endangered and threatened species have been protected in the USA and its territories. Most species continue to face a significant risk of extinction, but the status of many species is improving. Here we present analyses of federal agency reports to the United States Congress (1988-2002) that describe differences in species status and show which variables are correlated with improving or declining status. We found that 52% of species showed repeated improvements or were not declining over this time. Species status improves over time, with only 35% still declining 13 years or more after protection. Taxonomy, funding by US Fish and Wildlife Service and National Oceanic and Atmospheric Administration, and agency assessment of risk of extinction and potential to recover were significantly correlated with status.
自1973年《濒危物种法》通过以来，美国及其属地已有1300多种濒危和受威胁物种得到保护。大多数物种仍面临着重大的灭绝风险，但许多物种的状况正在改善。在此，我们对提交给美国国会的联邦机构报告（1988 - 2002年）进行了分析，这些报告描述了物种状况的差异，并指出哪些变量与状况的改善或恶化相关。我们发现，在此期间，52%的物种状况反复改善或没有恶化。随着时间推移，物种状况有所改善，在受到保护13年或更长时间后，仍在衰退的物种仅占35%。物种分类、美国鱼类及野生动物管理局和国家海洋和大气管理局提供的资金，以及机构对灭绝风险和恢复潜力的评估与物种状况显著相关。
