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Effects of natural and sexual selection on adaptive population divergence and premating isolation in a damselfly

Svensson, Erik LU orcid ; Eroukhmanoff, Fabrice LU and Friberg, M (2006) In Evolution 60(6). p.1242-1253
Abstract
The relative strength of different types of directional selection has seldom been compared directly in natural populations. A recent meta-analysis of phenotypic selection studies in natural populations suggested that directional sexual selection may be stronger in magnitude than directional natural selection, although this pattern may have partly been confounded by the different time scales over which selection was estimated. Knowledge about the strength of different types of selection is of general interest for understanding how selective forces affect adaptive population divergence and how they may influence speciation. We studied divergent selection on morphology in parapatric, natural damselfly (Calopteryx splendens) populations.... (More)
The relative strength of different types of directional selection has seldom been compared directly in natural populations. A recent meta-analysis of phenotypic selection studies in natural populations suggested that directional sexual selection may be stronger in magnitude than directional natural selection, although this pattern may have partly been confounded by the different time scales over which selection was estimated. Knowledge about the strength of different types of selection is of general interest for understanding how selective forces affect adaptive population divergence and how they may influence speciation. We studied divergent selection on morphology in parapatric, natural damselfly (Calopteryx splendens) populations. Sexual selection was stronger than natural selection measured on the same traits, irrespective of the time scale over which sexual selection was measured. Visualization of the fitness surfaces indicated that population divergence in overall morphology is more strongly influenced by divergent sexual selection rather than natural selection. Courtship success of experimental immigrant males was lower than that of resident males, indicating incipient sexual isolation between these populations. We conclude that current and strong sexual selection promotes adaptive population divergence in this species and that premating sexual isolation may have arisen as a correlated response to divergent sexual selection. Our results highlight the importance of sexual selection, rather than natural selection in the adaptive radiation of odonates, and supports previous suggestions that divergent sexual selection promotes speciation in this group. (Less)
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author
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publishing date
type
Contribution to journal
publication status
published
subject
in
Evolution
volume
60
issue
6
pages
1242 - 1253
publisher
Wiley-Blackwell
external identifiers
  • wos:000238969900012
  • pmid:16892974
  • scopus:33748531310
ISSN
1558-5646
DOI
10.1554/06-036.1
language
English
LU publication?
yes
id
115d8109-d187-46f8-a6a7-02afdfaab733 (old id 159757)
date added to LUP
2016-04-01 15:25:39
date last changed
2021-11-09 02:33:23
@article{115d8109-d187-46f8-a6a7-02afdfaab733,
  abstract     = {The relative strength of different types of directional selection has seldom been compared directly in natural populations. A recent meta-analysis of phenotypic selection studies in natural populations suggested that directional sexual selection may be stronger in magnitude than directional natural selection, although this pattern may have partly been confounded by the different time scales over which selection was estimated. Knowledge about the strength of different types of selection is of general interest for understanding how selective forces affect adaptive population divergence and how they may influence speciation. We studied divergent selection on morphology in parapatric, natural damselfly (Calopteryx splendens) populations. Sexual selection was stronger than natural selection measured on the same traits, irrespective of the time scale over which sexual selection was measured. Visualization of the fitness surfaces indicated that population divergence in overall morphology is more strongly influenced by divergent sexual selection rather than natural selection. Courtship success of experimental immigrant males was lower than that of resident males, indicating incipient sexual isolation between these populations. We conclude that current and strong sexual selection promotes adaptive population divergence in this species and that premating sexual isolation may have arisen as a correlated response to divergent sexual selection. Our results highlight the importance of sexual selection, rather than natural selection in the adaptive radiation of odonates, and supports previous suggestions that divergent sexual selection promotes speciation in this group.},
  author       = {Svensson, Erik and Eroukhmanoff, Fabrice and Friberg, M},
  issn         = {1558-5646},
  language     = {eng},
  number       = {6},
  pages        = {1242--1253},
  publisher    = {Wiley-Blackwell},
  series       = {Evolution},
  title        = {Effects of natural and sexual selection on adaptive population divergence and premating isolation in a damselfly},
  url          = {http://dx.doi.org/10.1554/06-036.1},
  doi          = {10.1554/06-036.1},
  volume       = {60},
  year         = {2006},
}