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Historical isolation facilitates species radiation by sexual selection : Insights from Chorthippus grasshoppers

Nolen, Zachary J LU orcid ; Yildirim, Burcin ; Irisarri, Iker ; Liu, Shanlin ; Groot Crego, Clara ; Amby, Daniel Buchvaldt ; Mayer, Frieder ; Gilbert, M Thomas P and Pereira, Ricardo J (2020) In Molecular Ecology 29(24). p.4985-5002
Abstract

Theoretical and empirical studies have shown that species radiations are facilitated when a trait under divergent natural selection is also involved in sexual selection. It is yet unclear how quick and effective radiations are where assortative mating is unrelated to the ecological environment and primarily results from sexual selection. We address this question using sympatric grasshopper species of the genus Chorthippus, which have evolved strong behavioural isolation while lacking noticeable ecomorphological divergence. Mitochondrial genomes suggest that the radiation is relatively recent, dating to the mid-Pleistocene, which leads to extensive incomplete lineage sorting throughout the mitochondrial and nuclear genomes.... (More)

Theoretical and empirical studies have shown that species radiations are facilitated when a trait under divergent natural selection is also involved in sexual selection. It is yet unclear how quick and effective radiations are where assortative mating is unrelated to the ecological environment and primarily results from sexual selection. We address this question using sympatric grasshopper species of the genus Chorthippus, which have evolved strong behavioural isolation while lacking noticeable ecomorphological divergence. Mitochondrial genomes suggest that the radiation is relatively recent, dating to the mid-Pleistocene, which leads to extensive incomplete lineage sorting throughout the mitochondrial and nuclear genomes. Nuclear data shows that hybrids are absent in sympatric localities but that all species have experienced gene flow, confirming that reproductive isolation is strong but remains incomplete. Demographic modelling is most consistent with a long period of geographic isolation, followed by secondary contact and extensive introgression. Such initial periods of geographic isolation might facilitate the association between male signaling and female preference, permitting the coexistence of sympatric species that are genetically, morphologically, and ecologically similar, but otherwise behave mostly as good biological species.

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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Molecular Ecology
volume
29
issue
24
pages
4985 - 5002
publisher
Wiley-Blackwell
external identifiers
  • pmid:33065760
  • scopus:85097026372
ISSN
0962-1083
DOI
10.1111/mec.15695
language
English
LU publication?
yes
additional info
© 2020 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.
id
afce59c1-4722-4998-8c44-0abde624602c
date added to LUP
2020-12-07 11:35:01
date last changed
2024-06-13 01:11:39
@article{afce59c1-4722-4998-8c44-0abde624602c,
  abstract     = {{<p>Theoretical and empirical studies have shown that species radiations are facilitated when a trait under divergent natural selection is also involved in sexual selection. It is yet unclear how quick and effective radiations are where assortative mating is unrelated to the ecological environment and primarily results from sexual selection. We address this question using sympatric grasshopper species of the genus <i>Chorthippus</i>, which have evolved strong behavioural isolation while lacking noticeable ecomorphological divergence. Mitochondrial genomes suggest that the radiation is relatively recent, dating to the mid-Pleistocene, which leads to extensive incomplete lineage sorting throughout the mitochondrial and nuclear genomes. Nuclear data shows that hybrids are absent in sympatric localities but that all species have experienced gene flow, confirming that reproductive isolation is strong but remains incomplete. Demographic modelling is most consistent with a long period of geographic isolation, followed by secondary contact and extensive introgression. Such initial periods of geographic isolation might facilitate the association between male signaling and female preference, permitting the coexistence of sympatric species that are genetically, morphologically, and ecologically similar, but otherwise behave mostly as good biological species.</p>}},
  author       = {{Nolen, Zachary J and Yildirim, Burcin and Irisarri, Iker and Liu, Shanlin and Groot Crego, Clara and Amby, Daniel Buchvaldt and Mayer, Frieder and Gilbert, M Thomas P and Pereira, Ricardo J}},
  issn         = {{0962-1083}},
  language     = {{eng}},
  number       = {{24}},
  pages        = {{4985--5002}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Molecular Ecology}},
  title        = {{Historical isolation facilitates species radiation by sexual selection : Insights from Chorthippus grasshoppers}},
  url          = {{http://dx.doi.org/10.1111/mec.15695}},
  doi          = {{10.1111/mec.15695}},
  volume       = {{29}},
  year         = {{2020}},
}