23. Diagnosing Causes of Endangerment

23. Diagnosing Causes of Endangerment - Identifying...

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Identifying Endangered Species (…continued from Oct 14 ) When does a rare or declining species warrant the special management attention reserved for endangered species?
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Population Viability Analysis PVA is the use of quantitative methods to predict the likely future status of a population or collection of populations based on data collected on the population in the past PVAs are frequently used to determine if a populations should be given the special attention reserved for endangered species
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Problems with PVAs Absolute predictions of extinction risk and minimum viable populations are usually plagued by uncertainty. Long-term predictions are particularly problematic because the future is unknown Relative predictions are much more defensible, for example comparing different management strategies or prioritizing populations for conservation
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Regional Impacts of Alternative Climate Change Scenarios on Spotted Owls
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IUCN Criteria Species gets special attention based on: Rate of population decline Small population size Small of geographic distribution Degree of population and distribution fragmentation PVA shows low viability
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THREATENED IUCN CATEGORIES Critically Endangered “extreme risk of extinction in the wild in the immediate future” 80% reduction in last 10 years (or 3 generations whichever is longer) occurs over < 100km 2 <250 individuals in fragmented habitat and declining
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23. Diagnosing Causes of Endangerment - Identifying...

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