Dr Jen Bright J.Bright@hull.ac.uk
Lecturer in Zoology
The shapes of bird beaks are highly controlled by nondietary factors
Bright, Jen A.; Marugán-Lobón, Jesús; Cobb, Samuel N.; Rayfield, Emily J.
Authors
Jesús Marugán-Lobón
Samuel N. Cobb
Emily J. Rayfield
Abstract
Bird beaks are textbook examples of ecological adaptation to diet, but their shapes are also controlled by genetic and developmental histories. To test the effects of these factors on the avian craniofacial skeleton, we conducted morphometric analyses on raptors, a polyphyletic group at the base of the landbird radiation. Despite common perception, we find that the beak is not an independently targeted module for selection. Instead, the beak and skull are highly integrated structures strongly regulated by size, with axes of shape change linked to the actions of recently identified regulatory genes. Together, size and integration account for almost 80% of the shape variation seen between different species to the exclusion of morphological dietary adaptation. Instead, birds of prey use size as a mechanism to modify their feeding ecology. The extent to which shape variation is confined to a few major axes may provide an advantage in that it facilitates rapid morphological evolution via changes in body size, but may also make raptors especially vulnerable when selection pressures act against these axes. The phylogenetic position of raptors suggests that this constraint is prevalent in all landbirds and that breaking the developmental correspondence between beak and braincase may be the key novelty in classic passerine adaptive radiations.
Citation
Bright, J. A., Marugán-Lobón, J., Cobb, S. N., & Rayfield, E. J. (2016). The shapes of bird beaks are highly controlled by nondietary factors. Proceedings of the National Academy of Sciences of the United States of America, 113(19), 5352-5357. https://doi.org/10.1073/pnas.1602683113
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 30, 2016 |
Online Publication Date | Apr 28, 2016 |
Publication Date | May 10, 2016 |
Deposit Date | Nov 28, 2019 |
Publicly Available Date | Dec 3, 2019 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Print ISSN | 0027-8424 |
Electronic ISSN | 1091-6490 |
Publisher | National Academy of Sciences |
Peer Reviewed | Peer Reviewed |
Volume | 113 |
Issue | 19 |
Pages | 5352-5357 |
DOI | https://doi.org/10.1073/pnas.1602683113 |
Keywords | Geometric morphometrics; Integration; Allometry; Birds; Modularity |
Public URL | https://hull-repository.worktribe.com/output/3267642 |
Publisher URL | https://www.pnas.org/content/113/19/5352 |
Files
Accepted manuscript
(1.1 Mb)
PDF
Copyright Statement
© 2016 National Academy of Sciences. This is an author produced version of a paper subsequently published in PNAS. Uploaded in accordance with the publisher's self-archiving policy.
You might also like
Innovation and elaboration on the avian tree of life
(2023)
Journal Article
Downloadable Citations
About Repository@Hull
Administrator e-mail: repository@hull.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search