Male mate choice in the annual fish Austrolebias reicherti (Cyprinodontiformes: Rivulidae): when size matters
While the importance of male mate choice is increasingly recognized, it continues to be an understudied aspect of sexual selection. Here, the effect of female body size on male mate choice was evaluated in the annual killifish Austrolebias reicherti, a species with marked sexual dimorphism in which males are more conspicuous than females. In dual-choice mate choice trials with unequal sized females we found that males spent significantly more time with larger females. Furthermore, larger females spawned more and larger eggs when spawning was allowed in non-choice trials. Therefore, male selection is probably attributable to the higher reproductive success of larger females. To our knowledge, this is the first study that provides evidence of both male mate choice in annual fishes and its possible fitness advantages. The implications of male mate choice for sexual selection in these fish highlight the need for further studies.
KeywordsAnnual killifish Body size Fecundity Male choice Operational sex ratio Sexual selection
We thank F. Reyes and A. Olivera for assistance in field fish collection, two reviewers for helpful comments on the manuscript, and M. García and Z. Hancock for improving the English. The work was funded by PEDECIBA (Programa para el Desarrollo de las Ciencias Básicas, Uruguay). CP, NV and AD were supported by the Sistema Nacional de Investigadores (SNI-ANII, Uruguay).
Compliance with ethical standards
All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
Conflict of interest
The authors declare that they have no conflict of interest.
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