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Variance in within-pair reproductive success influences the opportunity for selection annually and over the lifetimes of males in a multi-brooded songbird

View ORCID ProfileRyan R. Germain, Michael T. Hallworth, Sara A. Kaiser, T. Scott Sillett, Michael S. Webster
doi: https://doi.org/10.1101/2020.03.03.974790
Ryan R. Germain
1Cornell Lab of Ornithology, Cornell University, Ithaca, NY, USA
2Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, USA
3Department of Biology & GLOBE Institute, University of Copenhagen, Copenhagen, Denmark
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  • For correspondence: ryan.r.germain@gmail.com
Michael T. Hallworth
4Migratory Bird Center, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, USA
5Northeast Climate Adaptation Science Center, University of Massachusetts Amherst, Amherst, MA, USA
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Sara A. Kaiser
1Cornell Lab of Ornithology, Cornell University, Ithaca, NY, USA
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T. Scott Sillett
4Migratory Bird Center, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, DC, USA
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Michael S. Webster
1Cornell Lab of Ornithology, Cornell University, Ithaca, NY, USA
2Department of Neurobiology and Behavior, Cornell University, Ithaca, NY, USA
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Abstract

In socially monogamous species, male reproductive success consists of ‘within-pair’ offspring produced with their socially-paired mate(s), and ‘extra-pair’ offspring produced with additional females throughout the population. Both reproductive pathways offer distinct opportunities for selection in wild populations, as each is composed of separate components of mate attraction, female fecundity, and paternity allocation. Identifying key sources of variance and covariance among these components is a crucial step towards understanding the reproductive strategies that males use to maximize fitness both annually and over their lifetimes. We use 16 years of complete reproductive data from a population of black-throated blue warblers (Setophaga caerulescens) to partition variance in male annual and lifetime reproductive success, and thereby identify if the opportunity for selection varies over the lifetimes of individual males and what reproductive strategies likely favor maximum lifetime fitness. The majority of variance in male reproduction was attributable to within-pair success, but the specific effects of individual components of variance differed between total annual and total lifetime reproductive success. Positive overall lifetime covariance between within-pair and extra-pair components indicates that males able to maximize within-pair success, particularly with double-brooding females, likely achieve higher overall lifetime fitness via both within-pair and extra-pair reproductive pathways.

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 4.0 International license.
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Posted December 08, 2020.
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Variance in within-pair reproductive success influences the opportunity for selection annually and over the lifetimes of males in a multi-brooded songbird
Ryan R. Germain, Michael T. Hallworth, Sara A. Kaiser, T. Scott Sillett, Michael S. Webster
bioRxiv 2020.03.03.974790; doi: https://doi.org/10.1101/2020.03.03.974790
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Variance in within-pair reproductive success influences the opportunity for selection annually and over the lifetimes of males in a multi-brooded songbird
Ryan R. Germain, Michael T. Hallworth, Sara A. Kaiser, T. Scott Sillett, Michael S. Webster
bioRxiv 2020.03.03.974790; doi: https://doi.org/10.1101/2020.03.03.974790

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