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Climate change and Rocky Mountain native trout

Posted date: December 04, 2014
Publication Year: 
Authors: Isaak, Daniel J.;
Document type: Briefing Papers


Like many fishes native to the Rocky Mountains and the Pacific Northwest, cutthroat trout (Oncorhynchus clarkii) and bull trout (Salvelinus confluentus) have declined, apparently in response to changes to flow regimes, habitat alteration, and the introduction of non-native species. Many remaining native trout populations are heavily fragmented and persist only in small patches of habitat, with the degree of fragmentation increasing towards the southern range extent. Rapidly warming climates across much of this range threatens many populations.

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Furniss, Michael J.; Roby, Ken B.; Cenderelli, Dan; Chatel, John; Clifton, Caty F.;Clingenpeel, Alan; Hays, Polly E.; Higgins, Dale; Hodges, Ken; Howe, Carol; Jungst, Laura; Louie, Joan; Mai, Christine; Martinez, Ralph; Overton, Kerry; Staab, Brian P.; Steinke, Rory; Weinhold, Mark. 2013. Assessing the vulnerability of watersheds to climate change: results of national forest watershed vulnerability pilot assessments. Gen. Tech. Rep. PNW-GTR-884. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 32 p. plus appendix.

Isaak, Daniel J.; Muhlfeld, Clint C.; Todd, Andrew S.; Al-Chokhachy, Robert; Roberts, James; Kershner, Jeffrey L.; Fausch, Kurt D.; Hostetler, Steven W. 2012. The past as prelude to the future for understanding 21st-Century climate effects on Rocky Mountain trout. Fisheries. 37(12): 542-556.

Wenger, Seth J.; Isaak, Daniel J.; Dunham, Jason B.; Fausch, Kurt D.; Luce, Charles H.; Neville, Helen M.; Rieman, Bruce E.; Young, Michael K.; Nagel, David E.; Horan, Dona L.; Chandler, Gwynne L. 2011. Role of climate and invasive species in structuring trout distributions in the interior Columbia River Basin, USA. Canadian Journal of Fisheries and Aquatic Science. 68: 988-1008.

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