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Reproductive Success and Sexual Selection in Wild Eastern Tiger Salamanders (Ambystoma t. tigrinum)

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Abstract

Variation in reproductive success is most pronounced in species with strongly biased operational sex ratios, prominent sexual dimorphisms, and where mate competition and choice are likely. We studied sexual selection in eastern tiger salamanders (Ambystoma t. tigrinum) and examined the role of body size on reproductive success. We genotyped 155 adults and 1,341 larvae from 90 egg masses at six microsatellite loci. Parentage analyses revealed both sexes engaged in multiple matings, but was more common among females (64%) than males (27%). However, the standardized variance in mating and reproductive success was higher in males. Bateman gradients were significant and nearly identical in both sexes, suggesting that sexual selection was roughly equal between sexes. Body size was not correlated with mating or reproductive success in either sex. The apparent lack of sexual selection on body size may be a result of sperm storage, sperm competition, alternative mating tactics, and/or random induction of spermatophores.

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Acknowledgements

We thank S. Baker, L. Sheets, S. Hecht, and numerous other technicians for help in collecting salamanders. We also thank members of the DeWoody lab for helpful comments on earlier drafts of this manuscript. Animals were collected under permits issued by the Indiana Department of Natural Resources and the Purdue University animal care and use committee. Financial support was provided by Purdue University and the National Science Foundation (DEB-0514815 awarded to J.A.D.). This is Agricultural Research Programs contribution number 2007-18264 from Purdue University.

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    Rod N. Williams & J. Andrew DeWoody

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Appendix 1 Matrix of parental crosses and number of embryos designated to each cross (parent–offspring array)
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Williams, R.N., DeWoody, J.A. Reproductive Success and Sexual Selection in Wild Eastern Tiger Salamanders (Ambystoma t. tigrinum). Evol Biol 36, 201–213 (2009). https://doi.org/10.1007/s11692-009-9058-7

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