uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Non-gradual variation in colour morphs of the strawberry poison frog Dendrobates pumilio: genetic and geographical isolation suggest a role for selection in maintaining polymorphism
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Animal Ecology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Population and Conservation Biology. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.ORCID iD: 0000-0002-5553-2691
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Population and Conservation Biology. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
2007 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 16, no 20, 4284-4294 p.Article in journal (Refereed) Published
Abstract [en]

The relative roles that geographical isolation and selection play in driving population divergence remain one of the central questions in evolutionary biology. We approached this question by investigating genetic and morphological variation among populations of the strawberry poison frog, Dendrobates pumilio, in the Bocas del Toro archipelago, Panama. We found significant population genetic structure and isolation by distance based on amplified fragment length polymorphism markers. Snout vent length (SVL), coloration and the extent and size of dorsal black spots showed large variation among the studied populations. Differences in SVL correlated with genetic distance, whereas black spot patterns and other coloration parameters did not. Indeed, the latter characters were observed to be dramatically different between contiguous populations located on the same island. These results imply that neutral divergence among populations may account for the genetic patterns based on amplified fragment length polymorphism markers and SVL. However, selective pressures need to be invoked in order to explain the extraordinary variation in spot size and coverage, and coloration. We discuss the possibility that the observed variation in colour morphs is a consequence of a combination of local variation in both natural selection on an aposematic signal towards visual predators and sexual selection generated by colour morph-specific mate preferences.

Place, publisher, year, edition, pages
2007. Vol. 16, no 20, 4284-4294 p.
Keyword [en]
genetic diversity, morphological variation, neutral divergence, Poison dart frogs, selection, speciation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-14742DOI: 10.1111/j.1365-294X.2007.03479.xISI: 000249829700007OAI: oai:DiVA.org:uu-14742DiVA: diva2:42513
Available from: 2008-01-31 Created: 2008-01-31 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Aposematism, Crypsis and Population Differentiation in the Strawberry Poison Frog
Open this publication in new window or tab >>Aposematism, Crypsis and Population Differentiation in the Strawberry Poison Frog
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Evolutionary transitions between the two major predator avoidance strategies aposematism and crypsis are expected to be associated with changes in many important traits of animals. However, empirical studies on populations experiencing ongoing or recent transitions between these strategies are rare. This thesis investigates the co-evolution of traits among populations of the Strawberry poison frog D.pumilio in Bocas del Toro, Panama. I found that all investigated populations were genetically distinct but that colour and pattern did not correlate with genetic or geographic distance, which suggests that selection needs to be invoked to explain the observed variation. Based on the chromatic contrast between frog dorsal colour and the natural habitat substrates used by the frogs, the populations were defined as bright or dull coloured. I found that frogs from bright coloured populations were larger. This is expected if aposematism is enhanced by large signals while crypsis is enhanced by small size. Further, individuals from bright coloured populations had a coarser black dorsal pattern, which is expected if crypsis is impaired by a bold pattern. The importance of pattern coarseness was confirmed by an avian detection experiment showing that coarse patterned dark green prey were more easily detected than dark green prey without pattern or with fine pattern. I put forward the hypothesis that enhanced protection, gained by aposematism, may affect behaviours that influence dispersal and pairing patterns. Indeed, males from bright coloured populations displayed at more exposed sites and showed a tendency to be more explorative and aggressive. In summary, my results show that the bright and dull coloured populations most likely represent an aposematic and a cryptic strategy, respectively. Furthermore, I show that evolutionary changes between aposematism and crypsis can be associated with coevolution of both morphology and behaviour. I argue that this coevolution may increase the likelihood of both pre- and post-zygotic reproductive isolation. This is because greater phenotypic differences between populations increase the likelihood of selection against badly adapted migrants and hybrids with intermediate traits.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 43 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 956
Keyword
co-evolution, population divergence, natural selection, sexual selection, warning colouration, Oophaga pumilio, Dendrobates pumilio, aggression, explorative behaviour, colour patterns
National Category
Evolutionary Biology Zoology Ecology
Research subject
Biology with specialization in Animal Ecology
Identifiers
urn:nbn:se:uu:diva-175240 (URN)978-91-554-8432-3 (ISBN)
Public defence
2012-09-28, Zootissalen, Villavägen 9, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2012-09-06 Created: 2012-06-04 Last updated: 2013-01-22

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Rudh, AndreasRogell, BjörnHöglund, Jacob

Search in DiVA

By author/editor
Rudh, AndreasRogell, BjörnHöglund, Jacob
By organisation
Animal EcologyPopulation and Conservation BiologyAnimal ecology
In the same journal
Molecular Ecology
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 376 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf