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Temperature heterogeneity correlates with intraspecific variation in physiological flexibility in a small endotherm

View ORCID ProfileMaria Stager, View ORCID ProfileNathan R. Senner, View ORCID ProfileDavid L. Swanson, Matthew D. Carling, Douglas K. Eddy, Timothy J. Grieves, Zachary A. Cheviron
doi: https://doi.org/10.1101/2020.11.16.383877
Maria Stager
1Division of Biological Sciences, University of Montana, Missoula, MT, USA 59812
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  • For correspondence: mstager@mailbox.sc.edu
Nathan R. Senner
2Department of Biological Sciences, University of South Carolina, Columbia, SC USA 29208
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David L. Swanson
3Department of Biology, University of South Dakota, Vermillion, SD USA 57069
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Matthew D. Carling
4Department of Zoology and Physiology, University of Wyoming, Laramie, WY USA 82071
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Douglas K. Eddy
4Department of Zoology and Physiology, University of Wyoming, Laramie, WY USA 82071
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Timothy J. Grieves
5Department of Biological Sciences, North Dakota State University, Fargo, ND USA 58102
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Zachary A. Cheviron
1Division of Biological Sciences, University of Montana, Missoula, MT, USA 59812
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ABSTRACT

Phenotypic flexibility allows individuals to reversibly modify trait values and theory predicts an individual’s relative degree of flexibility positively correlates with the environmental heterogeneity it experiences. We tested this prediction by integrating surveys of population genetic and physiological variation with thermal acclimation experiments and indices of environmental heterogeneity in the Dark-eyed Junco (Junco hyemalis) and its congeners. We combined measures of thermogenic capacity for ~300 individuals, >21,000 single nucleotide polymorphisms genotyped in 192 individuals, and laboratory acclimations replicated on five populations. We found that Junco populations: (1) differ in their thermal performance responses to temperature variation in situ; (2) exhibit intra-specific variation in their thermogenic flexibility in the laboratory that correlates with heterogeneity in their native thermal environment; and (3) harbor genetic variation that also correlates with temperature heterogeneity. These results provide comprehensive support that phenotypic flexibility corresponds with environmental heterogeneity and highlight its importance for coping with environmental change.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted November 17, 2020.
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Temperature heterogeneity correlates with intraspecific variation in physiological flexibility in a small endotherm
Maria Stager, Nathan R. Senner, David L. Swanson, Matthew D. Carling, Douglas K. Eddy, Timothy J. Grieves, Zachary A. Cheviron
bioRxiv 2020.11.16.383877; doi: https://doi.org/10.1101/2020.11.16.383877
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Temperature heterogeneity correlates with intraspecific variation in physiological flexibility in a small endotherm
Maria Stager, Nathan R. Senner, David L. Swanson, Matthew D. Carling, Douglas K. Eddy, Timothy J. Grieves, Zachary A. Cheviron
bioRxiv 2020.11.16.383877; doi: https://doi.org/10.1101/2020.11.16.383877

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