Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth

Eberhart-Phillips L, Küpper C, Miller TEX, Cruz-López M, Maher KH, dos Remedios N, Stoffel M, Hoffman J, Krüger O, Székely T (2017)
Proceedings of the National Academy of Sciences of the United States of America 114(27): E5474-E5481.

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Abstract / Bemerkung
Adult sex ratio (ASR) is a central concept in population biology and a key factor in sexual selection, but why do most demographic models ignore sex biases? Vital rates often vary between the sexes and across life history, but their relative contributions to ASR variation remain poorly understood—an essential step to evaluate sex ratio theories in the wild and inform conservation. Here, we combine structured two-sex population models with individual-based mark–recapture data from an intensively monitored polygamous population of snowy plovers. We show that a strongly male-biased ASR (0.63) is primarily driven by sex-specific survival of juveniles rather than adults or dependent offspring. This finding provides empirical support for theories of unbiased sex allocation when sex differences in survival arise after the period of parental investment. Importantly, a conventional model ignoring sex biases significantly overestimated population viability. We suggest that sex-specific population models are essential to understand the population dynamics of sexual organisms: reproduction and population growth are most sensitive to perturbations in survival of the limiting sex. Overall, our study suggests that sex-biased early survival may contribute toward mating system evolution and population persistence, with implications for both sexual selection theory and biodiversity conservation.
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Proceedings of the National Academy of Sciences of the United States of America
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114
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27
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E5474-E5481
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Eberhart-Phillips L, Küpper C, Miller TEX, et al. Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth. Proceedings of the National Academy of Sciences of the United States of America. 2017;114(27):E5474-E5481.
Eberhart-Phillips, L., Küpper, C., Miller, T. E. X., Cruz-López, M., Maher, K. H., dos Remedios, N., Stoffel, M., et al. (2017). Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth. Proceedings of the National Academy of Sciences of the United States of America, 114(27), E5474-E5481. doi:10.1073/pnas.1620043114
Eberhart-Phillips, L., Küpper, C., Miller, T. E. X., Cruz-López, M., Maher, K. H., dos Remedios, N., Stoffel, M., Hoffman, J., Krüger, O., and Székely, T. (2017). Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth. Proceedings of the National Academy of Sciences of the United States of America 114, E5474-E5481.
Eberhart-Phillips, L., et al., 2017. Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth. Proceedings of the National Academy of Sciences of the United States of America, 114(27), p E5474-E5481.
L. Eberhart-Phillips, et al., “Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth”, Proceedings of the National Academy of Sciences of the United States of America, vol. 114, 2017, pp. E5474-E5481.
Eberhart-Phillips, L., Küpper, C., Miller, T.E.X., Cruz-López, M., Maher, K.H., dos Remedios, N., Stoffel, M., Hoffman, J., Krüger, O., Székely, T.: Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth. Proceedings of the National Academy of Sciences of the United States of America. 114, E5474-E5481 (2017).
Eberhart-Phillips, Luke, Küpper, Clemens, Miller, Tom E. X., Cruz-López, Medardo, Maher, Kathryn H., dos Remedios, Natalie, Stoffel, Martin, Hoffman, Joseph, Krüger, Oliver, and Székely, Tamás. “Sex-specific early survival drives adult sex ratio bias in snowy plovers and impacts mating system and population growth”. Proceedings of the National Academy of Sciences of the United States of America 114.27 (2017): E5474-E5481.
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6 Zitationen in Europe PMC

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