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How Do Amphibians Go Extinct? (in Proc. Conference Biology & Management of Species and Habitats at Risk) Green, David M.
1999
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Abstract: Many causes have been proposed to explain the global decline of amphibian populations. These include acid precipitation, UV-b radiation, epidemic diseases, deformities, habitat disruption, etc. Amphibians are noted for their bi-phasic life histories, supposedly limited abilities to disperse, and permeable skins, yet amphibians also exhibit enormous variation in life histories and can maintain large populations. How do these intrinsic factors influence expectations of decline? Two sorts of declines are recognizable: a downward trend in numbers of individuals within populations, and a downward trend in numbers of populations. Populations decline in size when the numbers of new recruits and immigrants do not keep pace with losses of individuals due to death and emigration. Such a trend may be impossible to demonstrate. In similar fashion, though, the number of populations of a species is governed by the relative rate of losses of existing populations (local extinctions) versus colonization of new populations...
 
Green, David M.. 1999. How Do Amphibians Go Extinct? (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks. Proceedings - Conference Biology & Management. Vol. 1
 
Topic: Species and Ecosystems at Risk
Keywords: amphibian, Bufo fowleri, extinction, Fowler’s toad, Plethodon, salamander
ISSN:  Scientific Name: 
ISBN:  English Name: 
Other Identifier: University College of the Cariboo
 
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