Data from: Indirect genetic effects underlie oxygen-limited thermal tolerance within a coastal population of chinook salmon

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With global temperatures projected to surpass the limits of thermal tolerance for many species, evaluating the heritable variation underlying thermal tolerance is critical for understanding the potential for adaptation to climate change. We examined the evolutionary potential of thermal tolerance within a population of chinook salmon (Oncorhynchus tshawytscha) by conducting a full-factorial breeding design and measuring the thermal performance of cardiac function and the critical thermal maximum (CTmax) of offspring from each family. Additive genetic variation in offspring phenotype was mostly negligible, although these direct genetic effects explained 53% of the variation in resting heart rate (fH). Conversely, maternal effects had a significant influence on resting fH, scope for fH, cardiac arrhythmia temperature and CTmax. These maternal effects were associated with egg size, as indicated by strong relationships between the mean egg diameter of mothers and offspring thermal tolerance. Because egg size can be highly heritable in chinook salmon, our finding indicates that the maternal effects of egg size constitute an indirect genetic effect contributing to thermal tolerance. Such indirect genetic effects could accelerate evolutionary responses to the selection imposed by rising temperatures and could contribute to the population-specific thermal tolerance that has recently been uncovered among Pacific salmon populations.

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Author(s):

Muñoz, Nicolas J.

Muñoz, Nicolas J.

Western University

, Anttila, Katja

Anttila, Katja

University of British Columbia

, Chen, Zhongqi

Chen, Zhongqi

University of British Columbia

, Heath, John W.

Heath, John W.

Yellow Island Aquaculture Limited, Heriot Bay, British Columbia, Canada

, Farrell, Anthony P.

Farrell, Anthony P.

University of British Columbia

, Neff, Bryan D.

Neff, Bryan D.

Western University

, and Munoz, N. J.

Munoz, N. J.

Western University

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Source Repository:

Dryad

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URL:

https://doi.org/10.5061/dryad.682ns

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Publication date:

2014-06-12

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Keywords:

maternal effects, aerobic capacity, and evolutionary potential

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APA Citation:

Muñoz, N. J., Anttila, K., Chen, Z., Heath, J. W., Farrell, A. P., Neff, B. D., & Munoz, N. J. (2014). Data from: Indirect genetic effects underlie oxygen-limited thermal tolerance within a coastal population of chinook salmon [Data set]. Dryad. https://doi.org/10.5061/dryad.682ns

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