Sexual dimorphism and directional sexual selection on aposematic signals in a poison frog

Maan, Martine E.; Cummings, Molly E. (2009). Sexual dimorphism and directional sexual selection on aposematic signals in a poison frog. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 106(45), pp. 19072-19077. National Academy of Sciences NAS 10.1073/pnas.0903327106

[img] Text
Maan_Cummings_2009_PNatiAcadSci.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (874kB) | Request a copy
[img] Text
Maan_Cummings_2009_PNatiAcadSci_SI.pdf - Supplemental Material
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

It is commonly assumed that natural selection imposed by predators is the prevailing force driving the evolution of aposematic traits. Here, we demonstrate that aposematic signals are shaped by sexual selection as well. We evaluated sexual selection for coloration brightness in populations of the poison frog Oophaga [Dendrobates] pumilio in Panama's Bocas del Toro archipelago. We assessed female preferences for brighter males by manipulating the perceived brightness of spectrally matched males in two-way choice experiments. We found strong female preferences for bright males in two island populations and weaker or ambiguous preferences in females from mainland populations. Spectral reflectance measurements, coupled with an O. pumilio-specific visual processing model, showed that O. pumilio coloration was significantly brighter in island than in mainland morphs. In one of the island populations (Isla Solarte), males were significantly more brightly colored than females. Taken together, these results provide evidence for directional sexual selection on aposematic coloration and document sexual dimorphism in vertebrate warning coloration. Although aposematic signals have long been upheld as exemplars of natural selection, our results show that sexual selection should not be ignored in studies of aposematic evolution.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Ecology and Evolution (IEE) > Aquatic Ecology

UniBE Contributor:

Maan, Martine

Subjects:

500 Science > 570 Life sciences; biology

ISSN:

0027-8424

Publisher:

National Academy of Sciences NAS

Language:

English

Submitter:

Marcel Häsler

Date Deposited:

05 Sep 2014 15:38

Last Modified:

31 Jan 2015 09:06

Publisher DOI:

10.1073/pnas.0903327106

Uncontrolled Keywords:

aposematism, color, dendrobates, divergence, polymorphism

BORIS DOI:

10.7892/boris.49081

URI:

https://boris.unibe.ch/id/eprint/49081

Actions (login required)

Edit item Edit item
Provide Feedback