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Predicting extinction risk in declining species
A Purvis1, J L Gittleman, G Cowlishaw
1Department of Biology, and Natural Environment Research Council Population Biology, Imperial College, Ascot, UK. a.purvis@ic.ac.uk
Proceedings. Biological Sciences
|November 15, 2000
Summary
Species with a high trophic level, low population density, slow life history, and small geographic range are more vulnerable to extinction. These biological traits, along with anthropogenic factors, significantly influence extinction risk.
Area of Science:
- Ecology
- Conservation Biology
- Evolutionary Biology
Background:
- Numerous hypotheses exist regarding biological attributes predisposing species to extinction risk.
- A systematic analysis to differentiate between these hypotheses has been lacking.
Purpose of the Study:
- To conduct the first comparative test of biological attributes associated with extinction risk in contemporary carnivores and primates.
- To identify key traits that independently predict a species' vulnerability to decline.
Main Methods:
- Utilized complete phylogenies of contemporary carnivore and primate species.
- Performed comparative analyses to assess the association between biological traits and extinction risk.
Main Results:
- High trophic level, low population density, and slow life history were significantly associated with increased extinction risk.
- Small geographical range size emerged as a particularly strong predictor of extinction risk.
- These biological traits collectively explained approximately 50% of the variation in extinction risk among species.
Conclusions:
- Biological attributes, especially small geographic range, are critical determinants of extinction risk.
- Anthropogenic factors play a significant role in extinction risk, independent of species' intrinsic biology.