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1 September 2010 Basin-Scale Surveys of Stream-Associated Amphibians in Intensively Managed Forests
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Conservation and management of native species on landscapes managed for intensive wood production represents an ongoing challenge to forest managers. Previous research suggests that impacts of forest practices on stream-associated amphibians (SAA; giant [Dicamptodon spp.], torrent [Rhyacotriton spp.], and plethodontid [Plethodon spp.] salamanders and coastal tailed frogs [Ascaphus truei]) in Oregon and Washington, USA, vary spatially and temporally as a result of biotic and abiotic factors, some of which can be influenced by management treatments. Although individual harvest units can encompass multiple stream reaches and entire second-order basins, nearly all published research studies used stream reaches of various lengths as sample units. To address this discrepancy between research and operational scales, we sampled first-, second-, and third-order streams in 70 randomly selected third-order basins in Oregon and Washington in 2007 and 2008 to estimate detection and occupancy parameters for SAA and to develop basin-level density estimates for different species and genera. We estimated occupancy probabilities of 0.99 (95% CL  =  0.96–1.00) for torrent and giant salamanders, 0.93 (95% CL  =  0.76–0.92) for Dunn's salamanders (Plethodon dunni), and 0.60 (95% CL  =  0.46–0.72) for tailed frogs. Our estimates can be compared with estimates for unmanaged third-order basins in Oregon and Washington to provide a relative measure of potential impacts of forest management on these taxa. In addition, our estimates provide baseline information with which to assess potential effects of future environmental changes on the 4 genera.

Andrew J. Kroll, James G. Maccracken, Timothy C. Mcbride, Jenniffer Bakke, Jeff Light, Phil Peterson, and Janette Bach "Basin-Scale Surveys of Stream-Associated Amphibians in Intensively Managed Forests," Journal of Wildlife Management 74(7), 1580-1587, (1 September 2010).
Published: 1 September 2010

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