@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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    <dc:contributor>Morrissey, Jean M.</dc:contributor>
    <dc:creator>Schartl, Manfred</dc:creator>
    <dc:creator>Morrissey, Jean M.</dc:creator>
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    <dcterms:bibliographicCitation>First publ. in: Nature 368 (1994), pp. 539-542</dcterms:bibliographicCitation>
    <dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
    <dcterms:title>Recurrent origin of a sexually selected trait in Xiphophorus fishes inferred from a molecular phylogeny</dcterms:title>
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    <dc:creator>Meyer, Axel</dc:creator>
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    <dc:contributor>Meyer, Axel</dc:contributor>
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    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:28:39Z</dc:date>
    <dc:contributor>Schartl, Manfred</dc:contributor>
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    <dcterms:issued>1994</dcterms:issued>
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