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Short-term response of Dicamptodon tenebrosus larvae to timber management in southwestern Oregon

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https://ir.library.oregonstate.edu/concern/articles/0v8381066

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  • In the Pacific Northwest, previous studies have found a negative effect of timber management on the abundance of stream amphibians, but results have been variable and region specific. These studies have generally used survey methods that did not account for differences in capture probability and focused on stands that were harvested under older management practices. We examined the influences of contemporary forest practices on larval Dicamptodon tenebrosus as part of the Hinkle Creek paired watershed study. We used a mark–recapture analysis to estimate D. tenebrosus density at 100 1-m sites spread throughout the basin and used extended linear models that accounted for correlation resulting from the repeated surveys at sites across years. Density was associated with substrate, but we found no evidence of an effect of harvest. While holding other factors constant, the model-averaged estimates indicated; 1) each 10% increase in small cobble or larger substrate increased median density of D. tenebrosus 1.05 times, 2) each 100-ha increase in the upstream area drained decreased median density of D. tenebrosus 0.96 times, and 3) increasing the fish density in the 40 m around a site by 0.01 increased median salamander density 1.01 times. Although this study took place in a single basin, it suggests that timber management in similar third-order basins of the southwestern Oregon Cascade foothills is unlikely to have short-term effects of D. tenebrosus larvae.
  • This is the publisher’s final pdf. The article is copyrighted by The Wildlife Society and published by John Wiley & Sons, Inc. It can be found at: http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291937-2817
  • Keywords: Dicamptodon tenebrosus, mark–recapture, stream amphibians, forest management, Pacific giant salamander, Oregon
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  • Leuthold, N., Adams, M. J. and Hayes, J. P. (2012), Short-term response of Dicamptodon tenebrosus larvae to timber management in southwestern Oregon. The Journal of Wildlife Management, 76: 28–37. doi: 10.1002/jwmg.269
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  • 76
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  • 1
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  • We thank the Oregon State University Forest Research Lab’s Fish and Wildlife Habitat in Managed Forests Research Program for funding this project. The U.S. Geological Survey Forest and Rangeland Ecosystem Science Center (FRESC) aided in funding and supplied logistic support. This is contribution number 380 of the U.S. Geological Survey Amphibian Research and Monitoring Initiative (ARMI).
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