Evolutionary time-series analysis reveals the signature of frequency-dependent selection on a female mating polymorphism

Le Rouzic, Arnaud, Hansen, Thomas F, Gosden, Thomas P and Svensson, Erik I (2015) Evolutionary time-series analysis reveals the signature of frequency-dependent selection on a female mating polymorphism. American Naturalist, 185 6: E182-E196. doi:10.1086/680982

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Author Le Rouzic, Arnaud
Hansen, Thomas F
Gosden, Thomas P
Svensson, Erik I
Title Evolutionary time-series analysis reveals the signature of frequency-dependent selection on a female mating polymorphism
Journal name American Naturalist   Check publisher's open access policy
ISSN 0003-0147
1537-5323
Publication date 2015-06-01
Year available 2015
Sub-type Article (original research)
DOI 10.1086/680982
Open Access Status File (Publisher version)
Volume 185
Issue 6
Start page E182
End page E196
Total pages 15
Place of publication Chicago, United States
Publisher University of Chicago Press
Collection year 2016
Language eng
Formatted abstract
A major challenge in evolutionary biology is understanding how stochastic and deterministic factors interact and influence macroevolutionary dynamics in natural populations. One classical approach is to record frequency changes of heritable and visible genetic polymorphisms over multiple generations. Here, we combined this approach with a maximum likelihood–based population-genetic model with the aim of understanding and quantifying the evolutionary processes operating on a female mating polymorphism in the blue-tailed damselfly Ischnura elegans. Previous studies on this color-polymorphic species have suggested that males form a search image for females, which leads to excessive mating harassment of common female morphs. We analyzed a large temporally and spatially replicated data set of between-generation morph frequency changes in I. elegans. Morph frequencies were more stable than expected from genetic drift alone, suggesting the presence of selection toward a stable equilibrium that prevents local loss or fixation of morphs. This can be interpreted as the signature of negative frequency-dependent selection maintaining the phenotypic stasis and genetic diversity in these populations. Our novel analytical approach allows the estimation of the strength of frequency-dependent selection from the morph frequency fluctuations around their inferred long-term equilibria. This approach can be extended and applied to other polymorphic organisms for which time-series data across multiple generations are available.
Keyword Ischnura elegans
Negative frequency-dependent selection
Balancing selection
Color polymorphism
Population genetics
Maximum likelihood
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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