Hybridization following recent secondary contact results in asymmetric genotypic and phenotypic introgression between island species of Myzomela honeyeaters

Evolution; International Journal of Organic Evolution
Jason M Sardell, J Albert C Uy

Abstract

Hybridization and introgression can have important evolutionary consequences for speciation, especially during early stages of secondary contact when reproductive barriers may be weak. Few studies, however, have quantified dynamics of hybridization and introgression in systems in which recent natural dispersal across a geographic barrier resulted in secondary contact. We investigated patterns of hybridization and introgression between two Myzomela honeyeaters (M. tristrami and M. cardinalis) that recently achieved secondary contact on Makira in the Solomon Islands. Hybridization in this system was hypothesized to be a byproduct of conspecific mate scarcity during early stages of colonization. Our research, however, provides evidence of ongoing hybridization more than a century after secondary contact. Mitochondrial sequencing revealed strongly asymmetric reproductive isolation that is most likely driven by postzygotic incompatibilities rather than prezygotic behavioral barriers. Nuclear introgression was observed from the native species (M. tristrami) to the colonizing species (M. cardinalis). Nuclear introgression in the reverse direction is almost exclusively limited to birds that are phenotypically M. tristrami but possess M...Continue Reading

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Citations

Aug 11, 2016·Molecular Ecology·Jessica PurcellAlan Brelsford
Jun 25, 2017·Trends in Ecology & Evolution·Michael L Arnold, Krushnamegh Kunte
Jul 1, 2018·Journal of Fish Biology·Genevieve DiedericksCang Hui
Jul 13, 2019·Evolution; International Journal of Organic Evolution·Sarah A Cowles, J Albert C Uy
Oct 30, 2019·Proceedings of the National Academy of Sciences of the United States of America·Peter R Grant, B Rosemary Grant
May 11, 2021·Molecular Ecology·Kyle A O'ConnellRayna C Bell
Aug 1, 2021·Proceedings of the National Academy of Sciences of the United States of America·Peter R Grant, B Rosemary Grant

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