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Complex interactions between local adaptation, plasticity, and sex affect vulnerability to warming in a widespread marine copepod

View ORCID ProfileMatthew Sasaki, Sydney Hedberg, Kailin Richardson, Hans G. Dam
doi: https://doi.org/10.1101/423624
Matthew Sasaki
1Department of Marine Science, University of Connecticut, Groton, CT, USA
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Sydney Hedberg
2Gustavus Adolphus College, St. Peter, MN, 56082
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Kailin Richardson
3Savannah State University, Savannah, GA, 31404
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Hans G. Dam
1Department of Marine Science, University of Connecticut, Groton, CT, USA
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Abstract

Predicting the response of populations to climate change requires knowledge of thermal performance. Genetic differentiation and phenotypic plasticity affect thermal performance, but the effects of sex and developmental temperatures often go uncharacterized. We used common garden experiments to test for effects of local adaptation, developmental phenotypic plasticity, and individual sex on thermal performance of the ubiquitous copepod, Acartia tonsa. Females had higher thermal tolerance than males in both populations, while the Florida population had higher thermal tolerance compared to the Connecticut population. An effect of developmental phenotypic plasticity on thermal tolerance was observed only in the Connecticut population. Ignoring sex-specific differences may result in a severe underestimation of population-level impacts of warming (i.e. - population decline due to sperm limitation). Further, despite having a higher thermal tolerance, southern populations may be more vulnerable to warming as they lack the ability to respond to increases in temperature through phenotypic plasticity.

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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-ND 4.0 International license.
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Posted September 23, 2018.
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Complex interactions between local adaptation, plasticity, and sex affect vulnerability to warming in a widespread marine copepod
Matthew Sasaki, Sydney Hedberg, Kailin Richardson, Hans G. Dam
bioRxiv 423624; doi: https://doi.org/10.1101/423624
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Complex interactions between local adaptation, plasticity, and sex affect vulnerability to warming in a widespread marine copepod
Matthew Sasaki, Sydney Hedberg, Kailin Richardson, Hans G. Dam
bioRxiv 423624; doi: https://doi.org/10.1101/423624

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