Perkins est torrent6/3/2023 ![]() Although a second regression tree grouped captures based on stream temperature, temperatures did not differ among the forest age classes identified. Captures were highest in 25- to 60-year-old forests, lowest in 0- to 24-year-old forests, and intermediate in forests greater than or equal to 61 years. Regression tree analysis grouped captures into forest age classes that corresponded to broad successional stages of regenerating forests in this region. To determine how abundance of stream-breeding Cascade torrent salamanders (Rhyacotriton cascadae) changes in response to forest harvest and subsequent regeneration, we surveyed first-order streams in forest stands 0-94 years old on industrial timberlands in the Cascade Mountains of southern Washington, USA, during the summers of 19.
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