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Geographic contrasts between pre- and postzygotic barriers are consistent with reinforcement in Heliconius butterflies
Univ York, Dept Biol, Wentworth Way, Heslington, England; Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA USA.
Univ York, Dept Biol, Wentworth Way, Heslington, England.
Univ York, Dept Biol, Wentworth Way, Heslington, England.
Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA.ORCID iD: 0000-0002-5142-6760
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2019 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 73, no 9, p. 1821-1838Article in journal (Refereed) Published
Abstract [en]

Identifying the traits causing reproductive isolation and the order in which they evolve is fundamental to understanding speciation. Here, we quantify prezygotic and intrinsic postzygotic isolation among allopatric, parapatric, and sympatric populations of the butterflies Heliconius elevatus and Heliconius pardalinus. Sympatric populations from the Amazon (H. elevatus and H. p. butleri) exhibit strong prezygotic isolation and rarely mate in captivity; however, hybrids are fertile. Allopatric populations from the Amazon (H. p. butleri) and Andes (H. p. sergestus) mate freely when brought together in captivity, but the female F1 hybrids are sterile. Parapatric populations (H. elevatus and H. p. sergestus) exhibit both assortative mating and sterility of female F1s. Assortative mating in sympatric populations is consistent with reinforcement in the face of gene flow, where the driving force, selection against hybrids, is due to disruption of mimicry and other ecological traits rather than hybrid sterility. In contrast, the lack of assortative mating and hybrid sterility observed in allopatric populations suggests that geographic isolation enables the evolution of intrinsic postzygotic reproductive isolation. Our results show how the types of reproductive barriers that evolve between species may depend on geography.

Place, publisher, year, edition, pages
2019. Vol. 73, no 9, p. 1821-1838
Keywords [en]
Butterflies, gene flow, hybrid sterility, prezygotic isolation, speciation
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-394972DOI: 10.1111/evo.13804ISI: 000486096000009PubMedID: 31334832OAI: oai:DiVA.org:uu-394972DiVA, id: diva2:1360168
Funder
German Research Foundation (DFG), Schu984/12-1NERC - the Natural Environment Research Council, NE/K012886/1Available from: 2019-10-11 Created: 2019-10-11 Last updated: 2019-10-11Bibliographically approved

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