Overview2008

Overview2008 - ESM 211 Applied Population Ecology Winter...

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ESM 211 Applied Population Ecology Winter 2008 Bruce Kendall 4514 Bren Hall x7539; [email protected] INCLUDE ‘211’ IN EMAIL SUBJECT
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Defining endangerment: the US Endangered Species Act “A species is listed under one of two categories, endangered or threatened, depending on its status and the degree of threat it faces. An “endangered” species is one that is in danger of extinction throughout all or a significant portion of its range. A “threatened” species is one that is likely to become endangered in the foreseeable future. To help conserve genetic diversity, the ESA defines “species” broadly to include subspecies and (for vertebrates) distinct populations.” (USFWS 2005, p. 1)
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Listing decision under the US ESA A species is added to the list when it is determined to be endangered or threatened because of any of the following factors: the present or threatened destruction, modification, or curtailment of the species’ habitat or range; overutilization for commercial, recreational, scientific, or educational purposes; disease or predation; the inadequacy of existing regulatory mechanisms; other natural or manmade factors affecting the species’ survival.
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Defining endangerment: the IUCN Red List 7 categories Extinct (EX); Extinct in the Wild (EW) Critically Endangered (CR); Endangered (EN); Vulnerable (VU) Near Threatened (NT); Least Concern (LC) Classification into CR, EN or VU based on quantitative criteria: most restrictive of 5
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Red List Criterion A Reduction in population size based on any of the following: CR EN VU 1) An observed, estimated, inferred or suspected population size reduction over the last 10 years or three generations, where the causes of the reduction are clearly reversible AND understood AND ceased > 90% > 70% > 50% 2) An observed, estimated, inferred or suspected population size reduction over the last 10 years or three generations, where the reduction
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This note was uploaded on 08/06/2008 for the course ESM 211 taught by Professor Kendall during the Winter '08 term at UCSB.

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Overview2008 - ESM 211 Applied Population Ecology Winter...

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