Journal
JOURNAL OF FISH BIOLOGY
Volume 76, Issue 10, Pages 2342-2369Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1095-8649.2010.02619.x
Keywords
climate change; salmonids; size-dependent survival; stream discharge
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Funding
- USGS Conte Fish Research Laboratory
- US Forest Service
- Northern Research Unit
- Bingham Foundation
- Nature Conservancy, Connecticut River Program
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A 5 year individual-based data set was used to estimate size-specific survival rates in a wild brook trout Salvelinus fontinalis population in a stream network encompassing a mainstem and three tributaries (1.5-6 m wetted width), western Massachusetts, U.S.A. The relationships between survival in summer and temperature and flow metrics derived from continuous monitoring data were then tested. Increased summer temperatures significantly reduced summer survival rates for S. fontinalis in almost all size classes in all four sites throughout the network. In contrast, extreme low summer flows reduced survival of large fish, but only in small tributaries, and had no significant effects on fish in smaller size classes in any location. These results provide direct evidence of a link between season-specific survival and environmental factors likely to be affected by climate change and have important consequences for the management of both habitats and populations.
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