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Investigating a trade-off between the quality of nest grown feathers and pace of development in an altricial bird

View ORCID ProfileConor C. Taff, View ORCID ProfileBrianna A. Johnson, Allison T. Anker, Alyssa M. Rodriguez, View ORCID ProfileJennifer L. Houtz, View ORCID ProfileJennifer J. Uehling, View ORCID ProfileMaren N. Vitousek
doi: https://doi.org/10.1101/2021.04.07.438834
Conor C. Taff
1Department of Ecology & Evolutionary Biology, Cornell University
2Lab of Ornithology, Cornell University
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  • For correspondence: cct63@cornell.edu
Brianna A. Johnson
1Department of Ecology & Evolutionary Biology, Cornell University
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Allison T. Anker
1Department of Ecology & Evolutionary Biology, Cornell University
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Alyssa M. Rodriguez
1Department of Ecology & Evolutionary Biology, Cornell University
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Jennifer L. Houtz
1Department of Ecology & Evolutionary Biology, Cornell University
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Jennifer J. Uehling
1Department of Ecology & Evolutionary Biology, Cornell University
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Maren N. Vitousek
1Department of Ecology & Evolutionary Biology, Cornell University
2Lab of Ornithology, Cornell University
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ABSTRACT

Life history theory provides a framework for understanding how trade-offs generate negative trait associations. Among nestling birds, developmental rate, risk of predation, and lifespan covary, but some associations are only found within species while others are only observed between species. A recent comparative study suggests that allocation trade-offs may be alleviated by disinvestment in ephemeral traits, such as nest-grown feathers, that are quickly replaced. However, direct resource allocation trade-offs cannot be inferred from inter-specific trait-associations without complementary intra-specific studies. Here, we asked whether there is evidence for a within-species allocation trade-off between feather quality and developmental speed in tree swallows (Tachycineta bicolor). Consistent with the idea that ephemeral traits are deprioritized, nest-grown feathers had lower barb density than adult feathers. However, despite substantial variation in fledging age among nestlings, there was no evidence for a negative association between developmental pace and feather quality. Furthermore, accounting for differences in resource availability by considering provisioning rate and a nest predation treatment did not reveal a trade-off that was masked by variation in resources. Our results are most consistent with the idea that the inter-specific association between development and feather quality arises from adaptive specialization, rather than from a direct allocation trade-off.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • https://github.com/cct663/tres_feather_density

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 April 09, 2021.
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Investigating a trade-off between the quality of nest grown feathers and pace of development in an altricial bird
Conor C. Taff, Brianna A. Johnson, Allison T. Anker, Alyssa M. Rodriguez, Jennifer L. Houtz, Jennifer J. Uehling, Maren N. Vitousek
bioRxiv 2021.04.07.438834; doi: https://doi.org/10.1101/2021.04.07.438834
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Investigating a trade-off between the quality of nest grown feathers and pace of development in an altricial bird
Conor C. Taff, Brianna A. Johnson, Allison T. Anker, Alyssa M. Rodriguez, Jennifer L. Houtz, Jennifer J. Uehling, Maren N. Vitousek
bioRxiv 2021.04.07.438834; doi: https://doi.org/10.1101/2021.04.07.438834

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