Shogren, E. H. et al. (2022) Dancing drives evolution of sexual size dimorphism in manakins. Proceedings of the Royal Society of London Series B: Biological Sciences, 289(1974), 20212540. (doi: 10.1098/rspb.2021.2540) (PMID:35506220)
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Abstract
Body size mediates life history, physiology and inter- and intra-specific interactions. Within species, sexes frequently differ in size, reflecting divergent selective pressures and/or constraints. Both sexual selection and differences in environmentally mediated reproductive constraints can drive sexual size dimorphism, but empirically testing causes of dimorphism is challenging. Manakins (Pipridae), a family of Neotropical birds comprising approximately 50 species, exhibit a broad range of size dimorphism from male- to female-biased and are distributed across gradients of precipitation and elevation. Males perform courtship displays ranging from simple hops to complex aerobatic manoeuvres. We tested associations between sexual size dimorphism and (a) agility and (b) environment, analysing morphological, behavioural and environmental data for 22 manakin species in a phylogenetic framework. Sexual dimorphism in mass was most strongly related to agility, with males being lighter than females in species performing more aerial display behaviours. However, wing and tarsus length dimorphism were more strongly associated with environmental variables, suggesting that different sources of selection act on different aspects of body size. These results highlight the strength of sexual selection in shaping morphology—even atypical patterns of dimorphism—while demonstrating the importance of constraints and ecological consequences of body size evolution.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | White, Dr Stewart |
| Authors: | Shogren, E. H., Anciães, M., Barske, J., Cestari, C., DuVal, E. H., Gaiotti, M. G., Johnson, E. I., Kimball, R. T., Marini, M. A., Ryder, T. B., Scholer, M. N., Ungvári, J., White, S. A., and Boyle, W. A. |
| College/School: | College of Medical Veterinary and Life Sciences |
| Journal Name: | Proceedings of the Royal Society of London Series B: Biological Sciences |
| Publisher: | The Royal Society |
| ISSN: | 0962-8452 |
| ISSN (Online): | 1471-2954 |
| Published Online: | 04 May 2022 |
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