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Differences in thermal tolerance among sockeye salmon populations
journal contribution
posted on 2023-05-18, 13:24 authored by Eliason, EJ, Clark, TD, Hague, MJ, Hanson, LM, Gallagher, ZS, Jeffries, KM, Gale, MK, Patterson, DA, Hinch, SG, Farrell, APClimate change–induced increases in summer water temperature have been associated with elevated mortality of adult sockeye salmon (Oncorhynchus nerka) during river migration. We show that cardiorespiratory physiology varies at the population level among Fraser River sockeye salmon and relates to historical environmental conditions encountered while migrating. Fish from populations with more challenging migratory environments have greater aerobic scope, larger hearts, and better coronary supply. Furthermore, thermal optima for aerobic, cardiac, and heart rate scopes are consistent with the historic river temperature ranges for each population. This study suggests that physiological adaptation occurs at a very local scale, with population-specific thermal limits being set by physiological limitations in aerobic performance, possibly due to cardiac collapse at high temperatures.
History
Publication title
ScienceVolume
332Issue
6025Pagination
109-112ISSN
0036-8075Department/School
Institute for Marine and Antarctic StudiesPublisher
Amer Assoc Advancement SciencePlace of publication
1200 New York Ave, Nw, Washington, USA, Dc, 20005Repository Status
- Restricted