Sexual dimorphism and intra-populational colour pattern variation in the aposematic frog Dendrobates tinctorius
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Despite the predicted purifying role of stabilising selection against variation in warning signals, many aposematic species exhibit high variation in their colour patterns. The maintenance of such variation is not well understood, but it has been suggested to be the result of an interaction between sexual and natural selection. This interaction could also facilitate the evolution of sexual dichromatism. Here we analyse in detail the colour patterns of the poison frog Dendrobates tinctorius and evaluate the possible correlates of the variability in aposematic signals in a natural population. Against the theoretical predictions of aposematism, we found that there is enormous intra-populational variation in colour patterns and that these also differ between the sexes: males have a yellower dorsum and bluer limbs than females. We discuss the possible roles of natural and sexual selection in the maintenance of this sexual dimorphism in coloration and argue that parental care could work synergistically with aposematism to select for yellower males.
KeywordsAposematism Polymorphism Sexual dimorphism Parental care Poison frog
This study was funded by two Les Nouragues grants from the CNRS (France), and student research allowances from the School of Psychology at the University of Exeter (UK) and the CIE at Deakin University (Australia), all to BR. P. Gaucher and M. Fernandez provided logistic support. We are thankful to Diana Pizano and J. Devillechabrolle for assistance in the field, and to J. Mappes, J. Valkonen, J. Brown and two anonymous reviewers for thoughtful comments and suggestions that improved the manuscript. This work was done in compliance with the local environmental regulations (research permit issued by CNRS-Guyane) and following ASAB’s guidelines for the treatment of animals in research.
- Born M, Bongers F, Poelman EH, Sterck FJ (2010) Dry-season retreat and dietary shift of the dart-poison frog Dendrobates tinctorius (Anura: Dendrobatidae). Phyllomedusa 9:37–52Google Scholar
- Boukal DS, Berec L, Krivan V (2008) Does sex-selective predation stabilize or destabilize predator-prey dynamics? PLoS One 3:e2687. doi: 10.1371/journal.pone.0002687
- Devillechabrolle J (2011) Mise en place et analyse d’un protocole pour le suivi à long terme d’amphibiens en forêt tropicale humide de Guyane Française. Masters Thesis, University of Marseille, Marseille, FranceGoogle Scholar
- Endler JA (1986) Natural selection in the wild. Princeton University Press, PrincetonGoogle Scholar
- Endler JA (1991) Interactions between predators and prey. In: Krebs JR, Davies NB (eds) Behavioural ecology. An evolutionary approach. Cambridge University Press, Cambridge, pp 169–196Google Scholar
- Endler JA (2000) Evolutionary implications of the interaction between animal signals and the environment. In: Espmark YO, Amundsen T, Rosenqvist G (eds) Animal signals: signalling and signal design in animal communication. Tapir Academic Press, Trondheim, pp 11–46Google Scholar
- Lescure J, Marty C (2000) Atlas des Amphibiens de Guyane, vol 45. Muséum National D’Histoire Naturelle, ParisGoogle Scholar
- Lötters S, Jungfer K-H, Henkel FW, Schmidt W (2007) Poison frogs: biology, species and captive husbandry. Edition Chimaira, FrankurtGoogle Scholar
- Poulton EB (1890) The colours of animals: their meaning and use, vol 26. Kegan Paul, TrenchGoogle Scholar
- Saporito RA, Zuercher R, Roberts M, Gerow KG, Donnelly MA (2007) Experimental evidence for aposematism in the dendrobatid poison frog Oophaga pumilio. Copeia 2007:1006–1011Google Scholar
- Silverstone PA (1975) A revision of the poison-arrow frogs of the genus Dendrobates Wagler. Nat Hist Mus Los Angeles Co. Sci Bull 21:1–55Google Scholar