Amphibian Declines: Judging Stability, Persistence, and Susceptibility of Populations to Local and Global Extinctions

Extinctions are normal biological phenomena Both mass extinctions in geological time and local extinc- tions in ecological time are well documented, but rates of extinction have increased in recentyears-especially in ver- tebrates, including amphibians-as illustrated by recent re- ports of their population declines and range reductions. We suggest that long-term population data are necessary for rig- orously evaluating the significance of the amphibian de- clines. Due to the physiological constraints, relatively low mobility, and site fidelity of amphibians, we suggest that many amphibian populations may be unable to recolonize areas after local extinction.

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