Inference of Timber Harvest Effects on Survival of Stream Amphibians Is Complicated by Movement

摘要: The effects of contemporary logging practices on headwater stream amphibians have received considerable study but with conflicting or ambiguous results. We posit that focusing inference demographic rates aquatic life stages may help refine understanding, as and terrestrial impacts differ considerably. investigated in-stream survival movement two stream-breeding amphibian species within a before-after timber harvest experiment in the Oregon Coast Range. used recaptures marked individuals joint probability model survival, movement, capture probability, to measure variation these attributed reach, gradient, pre- post-harvest periods, intensity. Downstream biased occurred both was greater for Coastal Tailed Frog (Ascaphus truei) larvae than Giant Salamanders (Dicamptodon tenebrosus). For D. tenebrosus, downstream early life, soon after an indiv...