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Sex chromosomes and male ornaments: a comparative evaluation in ray-finned fishes.

ABSTRACT: Theory predicts that the mechanism of genetic sex determination can substantially influence the evolution of sexually selected traits. For example, female heterogamety (ZZ/ZW) can favour the evolution of extreme male traits under Fisher's runaway model of sexual selection. We empirically test whether the genetic system of sex determination has played a role in the evolution of exaggerated male ornaments in actinopterygiian fishes, a clade in which both female-heterogametic and male-heterogametic systems of sex determination have evolved multiple times. Using comparative methods both uncorrected and corrected for phylogenetic non-independence, we detected no significant correlation between sex-chromosome systems and sexually selected traits in males. Results suggest that sex-determination mechanism is at best a relatively minor factor affecting the outcomes of sexual selection in ray-finned fishes.

SUBMITTER: Mank JE

PROVIDER: S-EPMC1560031 | biostudies-literature | 2006 Jan

REPOSITORIES: biostudies-literature

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Sex chromosomes and male ornaments: a comparative evaluation in ray-finned fishes.

Mank Judith E JE Hall David W DW Kirkpatrick Mark M Avise John C JC

Proceedings. Biological sciences 20060101 1583

Theory predicts that the mechanism of genetic sex determination can substantially influence the evolution of sexually selected traits. For example, female heterogamety (ZZ/ZW) can favour the evolution of extreme male traits under Fisher's runaway model of sexual selection. We empirically test whether the genetic system of sex determination has played a role in the evolution of exaggerated male ornaments in actinopterygiian fishes, a clade in which both female-heterogametic and male-heterogametic ...[more]

PMID: 16555792

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