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Southern Steelhead, Hard Woody Debris, and Temperature in a California Central Coast Watershed

Authors
  • Lisa C., Thompson
  • Jenna L., Voss
  • Royce E., Larsen
  • William D., Tietje
  • Ryan A., Cooper
  • Peter Moyle
Type
Published Article
Journal
Transactions of the American Fisheries Society
Publisher
Wiley (John Wiley & Sons)
Publication Date
Mar 01, 2012
Volume
141
Pages
275–275
Identifiers
DOI: 10.1080/00028487.2012.662200
Source
Center for Watershed Sciences John Muir Institute of the Environment
License
Unknown

Abstract

We surveyed large wood volumes in relation to the distribution and density of rainbow trout Oncorhynchus mykiss and steelhead (anadromous rainbow trout) in 15 stream reaches in the upper Salinas River watershed, California, which represents the southern end of the species\^a\texteuro\texttrademark range. The main tree species contributing to large wood were hardwoods: coast live oak Quercus agrifolia, California sycamore Platanus racemosa, red willow Salix laevigata, and valley oak Q. lobata. Large wood jams were important in pool formation and typically had red willow as their key pieces. Temperatures were exceptionally warm during the study period. No steelhead were observed at sites where the mean water temperature exceeded 21.5\textdegreeC or the maximum water temperature exceeded 26\textdegreeC. The combined importance of high temperatures and large wood on the distribution and abundance of southern steelhead indicates that suitable habitat may be reduced if climate change continues on its present course of warming and the frequency of fires increases. Received February 9, 2011; accepted July 18, 2011

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