Genetic structure is correlated with phenotypic divergence rather than geographic isolation in the highly polymorphic strawberry poison‐dart frog

  title={Genetic structure is correlated with phenotypic divergence rather than geographic isolation in the highly polymorphic strawberry poison‐dart frog},
  author={Ian J. Wang and Kyle Summers},
  journal={Molecular Ecology},
Phenotypic and genetic divergence can be influenced by a variety of factors, including sexual and natural selection, genetic drift and geographic isolation. Investigating the roles of these factors in natural systems can provide insight into the relative influences of allopatric and ecological modes of biological diversification in nature. The strawberry poison frog, Dendrobates pumilio, presents an excellent opportunity for this kind of research, displaying a diverse array of colour morphs and… 

Differential landscape effects on the fine-scale genetic structure of populations of a montane conifer from central Mexico

Such genetic structure combined with the convulse history of the Ajusco Volcano suggest a metapopulation-like dynamics over which disruptive selection is acting and should be taken into account by management programs, which should no longer consider the study site as a single homogeneous population.

Influence of environmental heterogeneity on genetic diversity and structure in an endemic southern Californian oak

It is found that genetic diversity is negatively associated with local climatic stability since the LGM, which may be due to higher immigration rates in unstable patches during favourable climatic periods and/or temporally varying selection.

Contrasting environmental drivers of genetic and phenotypic divergence in an Andean poison frog (Epipedobates anthonyi)

The results indicate that although distance and geographic barriers are important drivers of population divergence, environmental variation has a two-fold effect on population divergence.

What drives genetic and phenotypic divergence in the Red‐crowned Ant tanager (Habia rubica, Aves: Cardinalidae), a polytypic species?

The data point to geographic isolation as the main factor structuring genetic variation within populations of H. rubica and suggest that climate is not playing a major role in genetic differentiation within this species.

Do genetic structure and landscape heterogeneity impact color morph frequency in a polymorphic salamander?

The results suggest that selection is also an important evolutionary force across sites, and a balance between gene flow, genetic drift and selection interact to maintain the two color morphs in a polymorphic salamander.

Great influence of geographic isolation on the genetic differentiation of Myriophyllum spicatum under a steep environmental gradient

The findings suggested the dominant role of geography on the evolution of M. spicatum under a steep environmental gradient in the alpine landscape as a result of dispersal limitation and genetic drift.

Host association, environment, and geography underlie genomic differentiation in a major forest pest

It is concluded that ecologically mediated selection is contributing to variation within M. disstria, and that divergent adaptation related to both environmental conditions and host association should be considered in ongoing research and management of this important forest pest.

Phenotypic and genomic diversification with isolation by environment along elevational gradients in a neotropical treefrog

The environmental landscape has rendered a scenario where isolation by environment and candidate loci show concordance with phenotypic divergence in this tropical frog along an elevation gradient in the Colombian Andes, which sets the basis for evaluating the role of temperature in the genetic structure and local adaptation in tropical treefrogs and its putative effect on life cycle along elevation gradients.

Gene flow and climate‐associated genetic variation in a vagile habitat specialist

It is inferred that divergent selection related to variation in summer temperatures has produced two genetic clusters within P. m.

Testing evolutionary hypotheses for phenotypic divergence using landscape genetics

This study provides a beautiful example of the use of the emerging field of landscape genetics to differentiate among hypotheses for phenotypic divergence, and uses landscape genetic analyses to reject the hypotheses that colour pattern divergence is due to isolation‐by‐distance (IBD) or landscape resistance.



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

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 is discussed.

Genetic divergence is more tightly related to call variation than landscape features in the Amazonian frogs Physalaemus petersi and P. freibergi

The hypothesis that behavioural isolation from divergence in male calls and female preferences causes genetic divergence and speciation in the Amazonian frogs Physalaemus petersi and P. freibergi is supported.

Phenotypic and genetic divergence in three species of dart-poison frogs with contrasting parental behavior.

It is demonstrated that the color and pattern variation among populations of D. pumilio is not matched by higher levels of mitochondrial DNA sequence divergence relative to P. lugubris or Minyobates sp.

Random amplified polymorphic DNA analysis of southern brown bandicoot (Isoodon obesulus) populations in Western Australia reveals genetic differentiation related to environmental variables

Random amplified polymorphic DNA markers were used to analyse genetic variation within and between populations of Isoodon obesulus in Western Australia, suggesting that the importance of this process in the formation of population structure may be underestimated.

Molecular evidence for ecological speciation in tropical habitats

  • R. OgdenR. Thorpe
  • Biology, Environmental Science
    Proceedings of the National Academy of Sciences of the United States of America
  • 2002
Molecular markers were used to examine the effects of allopatric divergence and habitat on levels of gene flow in the Caribbean lizard, Anolis roquet, and results support the ecological speciation model of evolutionary divergence, indicating the importance of habitats in biodiversity generation.

The relative influence of natural selection and geography on gene flow in guppies

It is suggested that the standard predictions of ecological speciation may be heavily nuanced by the mating behaviour and life history strategies of guppies.


  • G. LuL. Bernatchez
  • Environmental Science, Biology
    Evolution; international journal of organic evolution
  • 1999
The extent of reproductive isolation reached between dwarf and normal whitefish ecotypes appears to be driven by the potential for occupying distinct trophic niches and, thus, by the same selective forces driving tropic specialization in each lake, which support the hypothesis of ecological speciation.


Results indicate that morphological divergence in T. cristinae reflects a balance between the effects of host‐specific natural selection and gene flow, and that data on mating preferences can help determine the causal associations between trait divergence and levels of gene flow.

Population structure of Columbia spotted frogs (Rana luteiventris) is strongly affected by the landscape

It is found that mountain Ridges and elevational differences were associated with increased genetic differentiation among sites, suggesting that gene flow is restricted by ridges and elevation in this species.

Spatial genetic structure in a metapopulation of the land snail Cepaea nemoralis (Gastropoda: Helicidae)

This study suggests that metapopulation structure depended on both landscape features and the shape of the dispersal function, and pointed to bottlenecks caused by founder effects after (re)colonization.