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Evaluating Streamflow and Temperature Effects on Bull Trout Migration and Survival with Linear Spatial Capture–Recapture Models

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https://ir.library.oregonstate.edu/concern/articles/qf85nm11n

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  • Objective: In the U.S. Pacific Northwest, climate change is increasing air temperatures, decreasing warm season (April–September) streamflow, and increasing cool season (October–March) streamflow. Warmer water temperatures may alter conditions for migratory coldwater fishes like the Bull Trout Salvelinus confluentus. Consequently, an understanding of Bull Trout migration and survival is critical for species conservation and restoration. In the Salmon River basin, Idaho, 1992 and 1993 transpired to be two of the most opposing extreme years among the past three decades for warm season water temperature and streamflow. These extremes provided a unique opportunity to retrospectively compare Bull Trout survival and migration under potential climate change scenarios.
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  • 153
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  • 3
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  • Retired IDFG researcher Dan Schill helped to conceive the study, design the work plan, collect field data, and organize the database. Rick Lowell, Ralph Steiner, Brad Dredge, Nicola Johnson, Jeff Seggerman, Michele Baer, and the former seasonal staff (especially Jason Vogel and Scott Springer) of IDFG RRH conducted most of the Bull Trout trapping and handling, provided data, and assisted with surgeries. Rocky Mountain Research Station (RMRS) biologist John Guzevich (deceased) and retired IDFG biologists Paul Kline and Steve Elle were integral to all field data collection, as were numerous RMRS seasonal employees. Kerry Overton (retired) provided access to habitat inventory databases. Nick Gerhardt (retired) of the Nez Perce National Forest provided initial Rapid River flow records, and personnel from the Payette National Forest New Meadows Ranger District assisted with logistical support. Mike Dorris of Sawtooth Aviation (formerly with McCall Air Taxi) expertly, safely, and efficiently piloted all telemetry flights. Adam Duarte (U.S. Forest Service) and Valerie Steen provided Bayesian modeling examples and advice. Michael J. Wohner (Oregon State University) assisted with preparing data for analysis, and Sharon Parkes (RMRS) assisted with creating maps. The Oregon Cooperative Fish and Wildlife Research Unit is jointly sponsored by the USGS, U.S. Fish and Wildlife Service, Oregon Department of Fish and Wildlife, Oregon State University, and Wildlife Management Institute. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
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  • 1548-8659

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