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

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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.


  • Zachary J Nolen
  • Burcin Yildirim
  • Iker Irisarri
  • Shanlin Liu
  • Clara Groot Crego
  • Daniel Buchvaldt Amby
  • Frieder Mayer
  • M Thomas P Gilbert
  • Ricardo J Pereira
Enheter & grupper
Externa organisationer
  • Ludwig-Maximilian University of Munich
  • Museum für Naturkunde
  • Uppsala universitet
  • Museo Nacional de Ciencias Naturales
  • University of Göttingen
  • Natural History Museum of Denmark
  • China Agricultural University
  • University of Copenhagen

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Evolutionsbiologi
Sidor (från-till)4985-5002
TidskriftMolecular Ecology
Utgåva nummer24
StatusPublished - 2020 dec
Peer review utfördJa