10.5061/DRYAD.682NS
Muñoz, Nicolas J.
Western University
Anttila, Katja
University of British Columbia
Chen, Zhongqi
University of British Columbia
Heath, John W.
Yellow Island Aquaculture Limited, Heriot Bay, British Columbia, Canada
Farrell, Anthony P.
University of British Columbia
Neff, Bryan D.
Western University
Munoz, N. J.
Western University
Data from: Indirect genetic effects underlie oxygen-limited thermal
tolerance within a coastal population of chinook salmon
Dryad
dataset
2014
maternal effects
aerobic capacity
evolutionary potential
2014-06-12T18:23:49Z
2014-06-12T18:23:49Z
en
https://doi.org/10.1098/rspb.2014.1082
717856 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
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.
Electronic Supplementary Material (data)The heart rate and CTmax data from
all individuals used in this study. These data were collected from 25
different families of chinook salmon (5 females and 5 males mated in all
combinations). Heart rates were counted from electrocardiograms and
recorded along with the corresponding temperature. These data were then
analyzed to find the Arrhenius break temperature of heart rate, which
corresponds to a drop in the temperature sensitivity (Q10) of heart rate.
The additive genetic, non-additive genetic, and maternal effects
contributing to cardiac performance and CTmax were calculated by
partitioning the variation in these phenotypes to Sire (i.e. father) and
Dam (i.e. mother) ID and their interaction using a two-way ANOVA.