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dc.contributor.authorAla-Honkola, Outi
dc.contributor.authorRitchie, Michael G.
dc.contributor.authorVeltsos, Paris
dc.date.accessioned2016-02-22T15:10:14Z
dc.date.available2016-02-22T15:10:14Z
dc.date.issued2016-03
dc.identifier241163307
dc.identifierf4728f10-e9df-44d4-a368-300671cc78e4
dc.identifier84961203577
dc.identifier000372488300010
dc.identifier.citationAla-Honkola , O , Ritchie , M G & Veltsos , P 2016 , ' Postmating–prezygotic isolation between two allopatric populations of Drosophila montana : fertilisation success differs under sperm competition ' , Ecology and Evolution , vol. 6 , no. 6 , pp. 1679–1691 . https://doi.org/10.1002/ece3.1995en
dc.identifier.issn2045-7758
dc.identifier.otherBibtex: urn:ceef0e9fd69fa0e545211b1eefa3cf4a
dc.identifier.otherORCID: /0000-0001-7913-8675/work/46761108
dc.identifier.urihttps://hdl.handle.net/10023/8282
dc.descriptionThis study was funded by the Academy of Finland (grant 250999 to O. A.-H.).en
dc.description.abstractPostmating but prezygotic (PMPZ) interactions are increasingly recognized as a potentially important early-stage barrier in the evolution of reproductive isolation. A recent study described a potential example between populations of the same species: single matings between Drosophila montana populations resulted in differential fertilisation success because of the inability of sperm from one population (Vancouver) to penetrate the eggs of the other population (Colorado). As the natural mating system of D. montana is polyandrous (females remate rapidly), we set up double matings of all possible crosses between the same populations to test whether competitive effects between ejaculates influence this PMPZ isolation. We measured premating isolation in no-choice tests, female fecundity, fertility and egg-to-adult viability after single and double matings as well as second-male paternity success (P2). Surprisingly, we found no PMPZ reproductive isolation between the two populations under a competitive setting, indicating no difficulty of sperm from Vancouver males to fertilize Colorado eggs after double matings. While there were subtle differences in how P2 changed over time, suggesting that Vancouver males’ sperm are somewhat less competitive in a first-male role within Colorado females, these effects did not translate into differences in overall P2. Fertilisation success can thus differ dramatically between competitive and noncompetitive conditions, perhaps because the males that mate second produce higher quality ejaculates in response to sperm competition. We suggest that unlike in more divergent species comparisons, where sperm competition typically increases reproductive isolation, ejaculate tailoring can reduce the potential for PMPZ isolation when recently diverged populations interbreed.
dc.format.extent13
dc.format.extent649001
dc.language.isoeng
dc.relation.ispartofEcology and Evolutionen
dc.subjectEjaculate tailoringen
dc.subjectEjaculate–ejaculate interactionen
dc.subjectPostcopulatory sexual selectionen
dc.subjectReproductive isolationen
dc.subjectSpeciationen
dc.subjectQH301 Biologyen
dc.subjectDASen
dc.subject.lccQH301en
dc.titlePostmating–prezygotic isolation between two allopatric populations of Drosophila montana : fertilisation success differs under sperm competitionen
dc.typeJournal articleen
dc.contributor.sponsorNERCen
dc.contributor.sponsorNERCen
dc.contributor.institutionUniversity of St Andrews. School of Biologyen
dc.contributor.institutionUniversity of St Andrews. Centre for Biological Diversityen
dc.contributor.institutionUniversity of St Andrews. Institute of Behavioural and Neural Sciencesen
dc.identifier.doi10.1002/ece3.1995
dc.description.statusPeer revieweden
dc.identifier.grantnumberNE/J020818/1en
dc.identifier.grantnumberNE/H010548/1en


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