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Evolutionary Time-Series Analysis Reveals the Signature of Frequency-Dependent Selection on a Female Mating Polymorphism

Le Rouzic, Arnaud; Hansen, Thomas F.; Gosden, Thomas LU and Svensson, Erik LU (2015) In American Naturalist 185(6). p.182-196
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
maximum likelihood, population genetics, color polymorphism, selection, balancing, negative frequency-dependent selection, Ischnura elegans
in
American Naturalist
volume
185
issue
6
pages
182 - 196
publisher
University of Chicago Press
external identifiers
  • wos:000354942900003
  • scopus:84929626309
ISSN
0003-0147
DOI
10.1086/680982
language
English
LU publication?
yes
id
03be71f5-a8d2-4169-8939-44badd80deca (old id 7410583)
date added to LUP
2015-06-29 12:43:31
date last changed
2017-11-12 03:07:19
@article{03be71f5-a8d2-4169-8939-44badd80deca,
  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.},
  author       = {Le Rouzic, Arnaud and Hansen, Thomas F. and Gosden, Thomas and Svensson, Erik},
  issn         = {0003-0147},
  keyword      = {maximum likelihood,population genetics,color polymorphism,selection,balancing,negative frequency-dependent selection,Ischnura elegans},
  language     = {eng},
  number       = {6},
  pages        = {182--196},
  publisher    = {University of Chicago Press},
  series       = {American Naturalist},
  title        = {Evolutionary Time-Series Analysis Reveals the Signature of Frequency-Dependent Selection on a Female Mating Polymorphism},
  url          = {http://dx.doi.org/10.1086/680982},
  volume       = {185},
  year         = {2015},
}