Why colour in subterranean vertebrates? Exploring the evolution of colour patterns in caecilian amphibians

Wollenberg, K. C.; John Measey, G.

Abstract

The proximate functions of animal skin colour are difficult to assign as they can result from natural selection, sexual selection or neutral evolution under genetic drift. Most often colour patterns are thought to signal visual stimuli; so, their presence in subterranean taxa is perplexing. We evaluate the adaptive nature of colour patterns in nearly a third of all known species of caecilians, an order of amphibians most of which live in tropical soils and leaf litter. We found that certain colour pattern elements in caecilians can be explained based on characteristics concerning above‐ground movement. Our study implies that certain caecilian colour patterns have convergently evolved under selection and we hypothesize their function most likely to be a synergy of aposematism and crypsis, related to periods when individuals move overground. In a wider context, our results suggest that very little exposure to daylight is required to evolve and maintain a varied array of colour patterns in animal skin.

Citation

Wollenberg, K. C., & John Measey, G. (2009). Why colour in subterranean vertebrates? Exploring the evolution of colour patterns in caecilian amphibians. Journal of evolutionary biology, 22(5), 1046-1056. https://doi.org/10.1111/j.1420-9101.2009.01717.x

• Journal Article Type: Article
• Acceptance Date: Jan 28, 2009
• Online Publication Date: Mar 23, 2009
• Publication Date: 2009-05
• Deposit Date: Aug 14, 2019
• Journal: Journal of Evolutionary Biology
• Print ISSN: 1010-061X
• Electronic ISSN: 1420-9101
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 22
• Issue: 5
• Pages: 1046-1056
• DOI: https://doi.org/10.1111/j.1420-9101.2009.01717.x
• Keywords: Aposematism; Caecilians; Colour; Crypsis; Evolution; Gymnophiona; Independent contrasts; Pattern selection
• Public URL: https://hull-repository.worktribe.com/output/1591810
• Publisher URL: https://onlinelibrary.wiley.com/doi/full/10.1111/j.1420-9101.2009.01717.x