Climate impacts at multiple scales: evidence for differential population responses in juvenile Chinook salmon
Article first published online: 17 JUL 2006
Journal of Animal Ecology
Volume 75, Issue 5, pages 1100–1109, September 2006
How to Cite
CROZIER, L. G. and ZABEL, R. W. (2006), Climate impacts at multiple scales: evidence for differential population responses in juvenile Chinook salmon. Journal of Animal Ecology, 75: 1100–1109. doi: 10.1111/j.1365-2656.2006.01130.x
- Issue published online: 17 JUL 2006
- Article first published online: 17 JUL 2006
- Received 27 October 2005; accepted 15 May 2006
- environmental change;
- freshwater survival;
- global warming;
- habitat quality
- 1We explored differential population responses to climate in 18 populations of threatened spring–summer Chinook salmon Onchorynchus tshawytscha in the Salmon River basin, Idaho.
- 2Using data from a long-term mark–release–recapture study of juvenile survival, we found that fall stream flow is the best predictor of average survival across all populations.
- 3To determine whether all populations responded similarly to climate, we used a cluster analysis to group populations that had similar annual fluctuations in survival. The populations grouped into four clusters, and different environmental factors were important for different clusters.
- 4Survival in two of the clusters was negatively correlated with summer temperature, and survival in the other two clusters was positively correlated with minimum fall stream flow, which in turn depends on snow pack from the previous winter.
- 5Using classification and regression tree analysis, we identified stream width and stream temperature as key habitat factors that shape the responses of individual populations to climate.
- 6Climate change will likely have different impacts on different populations within this metapopulation, and recognizing this diversity is important for accurately assessing risks.