Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances
Poikela, N., Kinnunen, J., Wurdack, M., Kauranen, H., Schmitt, T., Kankare, M., Snook, R. R., & Hoikkala, A. (2019). Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances. Evolution, 73(6), 1182-1199. https://doi.org/10.1111/evo.13732
©2019 The Authors. Evolution ©2019 The Society for the Study of Evolution.
The impact of different reproductive barriers on species or population isolation may vary in different stages of speciation depending on evolutionary forces acting within species and through species’ interactions. Genetic incompatibilities between interacting species are expected to reinforce prezygotic barriers in sympatric populations and lead to cascade reinforcement between conspecific populations living within and outside the areas of sympatry. We tested these predictions and studied whether and how the strength and target of reinforcement between Drosophila montana and Drosophila flavomontana vary between sympatric populations with different histories and species abundances. All barriers between D. montana females and D. flavomontana males were nearly complete, while in the reciprocal cross strong postzygotic isolation was accompanied by prezygotic barriers whose strength varied according to population composition. Sexual isolation between D. flavomontana females and D. montana males was increased in long‐established sympatric populations, where D. flavomontana is abundant, while postmating prezygotic (PMPZ) barriers were stronger in populations where this species is a new invader and still rare and where female discrimination against heterospecific males was lower. Strengthening of sexual and PMPZ barriers in this cross also induced cascade reinforcement of respective barriers between D. flavomontana populations, which is a classic signature of reinforcement process. ...
PublisherSociety for the Study of Evolution; Wiley
Dataset(s) related to the publicationhttps://datadryad.org/resource/doi:10.5061/dryad.6c9b2v5
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Related funder(s)Academy of Finland
Funding program(s)Research post as Academy Research Fellow, AoF
Additional information about fundingWe would like to thank H. Järvinen for her help with the experiments, and people in the laboratory for the fly maintenance. We also thank E. Virtanen, A. Hiillos, and E. Övermark for their contribution in Wolbachia studies, and V. Hoikkala for inspiring discussions. This work was supported by the grants from Academy of Finland (project 132619) and Ella and Georg Ehrnrooth Foundation to AH and Academy of Finland (projects 268214 and 272927) to MK. ...
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