| effects of timber harvesting on pond-breeding amphibian persistence: testing the evacuation hypothesis. | numerous studies have documented the decline of amphibians following timber harvest. however, direct evidence concerning the mechanisms of population decline is lacking and hinders attempts to develop conservation or recovery plans and solutions for forest species. we summarized the mechanisms by which abundance of amphibians may initially decline following timber harvest into three testable hypotheses: (1) mortality, (2) retreat, and (3) evacuation. here, we tested the evacuation hypothesis wit ... | 2008 | 18488596 |