Abstract
Male body size influences mate choice and sexual selection in many animal species. Here we investigate the role of male body size in the reproductive success of the field cricket Gryllus firmus. This species hybridizes with a close smaller relative, G. pennsylvanicus, and it is thought that this size difference may affect reproductive isolation between these species. We paired large and small G. firmus males with a single G. firmus female and genotyped the resulting offspring. Overall, larger males sired a greater proportion of offspring and in a majority of the crosses the larger male sired all of the offspring. For crosses in which both males sired offspring, there was no difference in the proportion of offspring sired by small and large males. Intrasexual competition, female choice, and differences in ejaculates between males could all influence the patterns we observe. We discuss the implications of our findings within the context of reproductive isolation between G. firmus and G. pennsylvanicus.
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Acknowledgments
We thank the members of the Harrison lab, Nathan Morehouse, and members of the Morehouse lab for useful comments on earlier drafts of the manuscript.
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Saleh, N.W., Larson, E.L. & Harrison, R.G. Reproductive Success and Body Size in the Cricket Gryllus firmus . J Insect Behav 27, 346–356 (2014). https://doi.org/10.1007/s10905-013-9425-1
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DOI: https://doi.org/10.1007/s10905-013-9425-1