Relationship between cardiac performance and environment across populations of Atlantic salmon (Salmo salar): a common garden experiment implicates local adaptation

被引:0
作者
Kayla J. Gradil
Shawn R. Garner
Chris C. Wilson
Anthony P. Farrell
Bryan D. Neff
机构
[1] Western University,Department of Biology
[2] Ontario Ministry of Natural Resources and Forestry,Aquatic Research and Monitoring Section
[3] University of British Columbia,Department of Zoology
[4] University of British Columbia,Faculty of Land and Food Systems
来源
Evolutionary Ecology | 2016年 / 30卷
关键词
Cardiac performance; Heart rate; Local adaptation; Temperature; Climate change; Atlantic salmon;
D O I
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中图分类号
学科分类号
摘要
Cardiac performance in fishes is predicted to be shaped by environmental factors such as temperature and river flow rate through natural selection for local adaptations, but few studies have explored these relationships. Using a common garden breeding design, we collected heart rate data from three populations of Atlantic salmon (Salmo salar) to measure peak heart rate and estimate optimal and upper critical temperatures for cardiac performance. We found that peak heart rate across populations matched the variation in natural river flow rates, such that the population that experienced the highest flow rate had the highest peak heart rate. Moreover, all populations showed evidence of local adaptation to summer water temperatures, with optimal temperatures (inferred from the Arrhenius breakpoint temperature) consistently falling 2.2–3.8 °C below the water temperature averaged for the summer months for each population. Also, upper critical temperatures (inferred from the temperature at which heart rates became arrhythmic) were nearly identical to peak summer water temperatures (0–0.3 °C above the peak). These results are consistent with heritable differences in cardiac performance among populations and suggest local adaptation to temperature and river flow.
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页码:877 / 886
页数:9
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