Sex chromosome linkage of mate preference and color signal maintains assortative mating between interbreeding finch morphs

Evolution; International Journal of Organic Evolution
Sarah R Pryke

Abstract

Assortative mating is a key aspect in the speciation process because it is important for both initial divergence and maintenance of distinct species. However, it remains a challenge to explain how assortative mating evolves when diverging populations are undergoing gene flow (e.g., during hybridization). Here I experimentally test how assortative mating is maintained with frequent gene flow between diverged head-color morphs of the Gouldian finch (Erythrura gouldiae). Contrary to the predominant view on the development of sexual preferences in birds, cross-fostered offspring did not imprint on the phenotype of their conspecific (red or black morphs) or heterospecific (Bengalese finch) foster parents. Instead, the mating preferences of F(1) and F(2) intermorph-hybrids are consistent with inheritance on the Z chromosomes, which are also the location for genes controlling color expression and the genes causing low fitness of intermorph-hybrids. Genetic associations between color signal and preference loci on the sex chromosomes may prevent recombination from breaking down these associations when the morphs interbreed, helping to maintain assortative mating in the face of gene flow. Although sex linkage of reproductively isolating ...Continue Reading

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Citations

Oct 5, 2012·Biology Letters·Jennifer J TempletonSimon C Griffith
Feb 4, 2011·Proceedings. Biological Sciences·Simon C GriffithWilliam A Buttemer
Oct 1, 2011·Proceedings. Biological Sciences·Chris WileyKerry L Shaw
Oct 19, 2012·Proceedings. Biological Sciences·Richard M MerrillChris D Jiggins
Sep 12, 2014·Proceedings. Biological Sciences·Hanna KokkoSarah R Pryke
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Mar 2, 2019·Evolution; International Journal of Organic Evolution·Thomas BlankersFrieder Mayer
Apr 26, 2017·Scientific Reports·Thomas BeckingClément Gilbert
Jan 27, 2019·Ecology and Evolution·Madeleine St Clair YewersClaire Alice McLean
May 10, 2018·Evolution; International Journal of Organic Evolution·D Justin YehMaria R Servedio
Sep 17, 2021·Journal of Evolutionary Biology·Kristal E CainLoeske E B Kruuk

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