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Testing female preferences under more natural conditions: a case study on a fiddler crab

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Abstract

Mate choice is often affected by multiple factors, and there are often trade-offs associated with choosing a mate. Additionally, experiments that test for mate preferences usually rely on simple two-choice tests. These tests are, however, often less complex than the scenarios that individuals face in natural populations. Here, we test female choice in the fiddler crab Uca mjoebergi. We looked at female preference for wave rates and proximity to males in simple two-choice tests. We then mimicked a more natural choice scenario, where females faced a cluster of six courting males that differed in their distance from the female as well as in their wave rate. In addition, we tested whether female preferences under these more complex conditions were affected by the risk of predation. We found a preference for faster wave rates and closer males in two-choice tests. The preference for closer males was, however, only evident when the difference in distance was large (15 cm), not when it was small (3 cm). When females chose between six males, they preferred the males that waved faster, even if they were further away. We did not, however, find any difference in female choice when a simulated predator was present or absent. By examining a more realistic set of options that females face, we can paint a better picture of how females’ trade-off costs and benefits during mate choice.

Significance statement

Mate choice experiments often rely on two-choice tests. Mate choice, however, is often more complex under totally natural conditions. Using a two-choice experiment, we show that female fiddler crabs U. mjoebergi show a preference for faster wave rates and closer males. Under a more natural choice scenario, when choosing between six males, females preferred to travel longer to reach faster waving males. We found that female responses did not differ when a predator was present or absent. Designing choice experiments to more accurately mimic natural conditions will allow assessing trade-offs that occur in mate choice.

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Acknowledgements

This work was supported by the Australian Research Council Discovery Grant to P.R.Y.B. (DP120101427). R.V.-T. was supported by the fellowships from Consejo Nacional de Ciencia y Tecnología-México and the Research School of Biology. We are grateful to the staff of the North Australia Research Unit for providing the research facilities. We thank Megan L. Head and the anonymous reviewers for their useful comments.

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Correspondence to Regina Vega-Trejo.

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This work was performed under an ethics approval permit (A2015/54) from the Australian National University Animal Experimentation Ethics Committee (ANUAEEC).

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Communicated by T. Breithaupt

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Vega-Trejo, R., Backwell, P.R.Y. Testing female preferences under more natural conditions: a case study on a fiddler crab. Behav Ecol Sociobiol 71, 81 (2017). https://doi.org/10.1007/s00265-017-2314-4

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  • DOI: https://doi.org/10.1007/s00265-017-2314-4

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