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Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances
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Number of Authors: 82019 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 73, no 6, p. 1182-1199Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2019. Vol. 73, no 6, p. 1182-1199
Keywords [en]
Courtship cue, Drosophila, female discrimination, speciation, sympatry, reinforcement
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-174984DOI: 10.1111/evo.13732ISI: 000485479600009PubMedID: 30957216OAI: oai:DiVA.org:su-174984DiVA, id: diva2:1362634
Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-10-21Bibliographically approved

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Snook, Rhonda R.
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Department of Zoology
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