Role of climate and invasive species in structuring trout distributions in the interior Columbia River Basin, USA

Canadian Journal of Fisheries and Aquatic Sciences
By: , and 

Links

Abstract

Recent and projected climate warming trends have prompted interest in impacts on coldwater fishes. We examined the role of climate (temperature and flow regime) relative to geomorphology and land use in determining the observed distributions of three trout species in the interior Columbia River Basin, USA. We considered two native species, cutthroat trout (Oncorhynchus clarkii) and bull trout (Salvelinus confluentus), as well as nonnative brook trout (Salvelinus fontinalis). We also examined the response of the native species to the presence of brook trout. Analyses were conducted using multilevel logistic regression applied to a geographically broad database of 4165 fish surveys. The results indicated that bull trout distributions were strongly related to climatic factors, and more weakly related to the presence of brook trout and geomorphic variables. Cutthroat trout distributions were weakly related to climate but strongly related to the presence of brook trout. Brook trout distributions were related to both climate and geomorphic variables, including proximity to unconfined valley bottoms. We conclude that brook trout and bull trout are likely to be adversely affected by climate warming, whereas cutthroat trout may be less sensitive. The results illustrate the importance of considering species interactions and flow regime alongside temperature in understanding climate effects on fish.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Role of climate and invasive species in structuring trout distributions in the interior Columbia River Basin, USA
Series title Canadian Journal of Fisheries and Aquatic Sciences
Volume 68
Issue 6
Year Published 2011
Language English
Publisher Canadian Science Publishing
Publisher location Ottawa, Ontario
Contributing office(s) Forest and Rangeland Ecosystem Science Center
Description 21 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Canadian Journal of Fisheries and Aquatic Sciences
First page 988
Last page 1008
Country United States
Other Geospatial Columbia River Basin