Publikation: Recurrent origin of a sexually selected trait in Xiphophorus fishes inferred from a molecular phylogeny
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DARWIN believed that sexual selection accounts for the evolution of exaggerated male ornaments, such as the sword-like caudal fin extensions of male fishes of the genus Xiphophorus, that appear detrimental to survival. Swordtails continue to feature prominently in empirical work and theories of sexual selection; the pre-existing bias hypothesis has been offered as an explanation for the evolution of swords in these fishes. Based upon a largely morphological phylogeny, this hypothesis suggests that female preference to mate with sworded males arose in ancestrally swordless species, thus pre-dating the origin of the sword itself and directly driving its evolution. Here we present a molecular phylogeny (based on mitochondria! and nuclear DNA sequences) of Xiphophorus which differs from the traditional one: it indicates that the sword originated and was lost repeatedly. Our phylogeny suggests that the ancestor of the genus is more likely to have possessed a sword than not, thus questioning the applicability of the pre-existing bias hypothesis as an explanation for the evolution of this sexually selected trait.
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MEYER, Axel, Jean M. MORRISSEY, Manfred SCHARTL, 1994. Recurrent origin of a sexually selected trait in Xiphophorus fishes inferred from a molecular phylogeny. In: Nature. 1994, 368(6471), pp. 539-542. ISSN 0028-0836. Available under: doi: 10.1038/368539a0BibTex
@article{Meyer1994Recur-6717, year={1994}, doi={10.1038/368539a0}, title={Recurrent origin of a sexually selected trait in Xiphophorus fishes inferred from a molecular phylogeny}, number={6471}, volume={368}, issn={0028-0836}, journal={Nature}, pages={539--542}, author={Meyer, Axel and Morrissey, Jean M. and Schartl, Manfred} }
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