Dataset.
Data from: A father effect explains sex-ratio bias
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/281698
Digital.CSIC. Repositorio Institucional del CSIC
- Malo, Aurelio F.
- Martínez-Pastor, Felipe
- García-González, Francisco
- Garde, José Julián
- Ballou, Jonathan D.
- Lacy, Robert C.
Data-Malo et al 2017
Data for the main analysis of the paper entitled "A father effect explains sex-ratio bias", relating the effects of sperm nucleus area and sperm nucleus length on offspring sex ratio (figure 1), the effects of the coefficient of inbreeding on offspring sex ratio weighing each data point for the total number of offspring (figure 2), and the effects of the coefficient of inbreeding on sperm nucleus area and sperm nucleus length (figure 3)., Sex ratio allocation has important fitness consequences, and theory predicts that parents should adjust offspring sex ratio in cases where the fitness returns of producing male and female offspring vary. The ability of fathers to bias offspring sex ratios has traditionally been dismissed given the expectation of an equal proportion of X- and Y-chromosome-bearing sperm (CBS) in ejaculates due to segregation of sex chromosomes at meiosis. This expectation has been recently refuted. Here we used Peromyscus leucopus to demonstrate that sex ratio is explained by an exclusive effect of the father, and suggest a likely mechanism by which male-driven sex-ratio bias is attained. We identified a male sperm morphological marker that is associated with the mechanism leading to sex ratio bias; differences among males in the sperm nucleus area (a proxy for the sex chromosome that the sperm contains) explain 22% variation in litter sex ratio. We further show the role played by the sperm nucleus area as a mediator in the relationship between individual genetic variation and sex-ratio bias. Fathers with high levels of genetic variation had ejaculates with a higher proportion of sperm with small nuclei area. This, in turn, led to siring a higher proportion of sons (25% increase in sons per 0.1 decrease in the inbreeding coefficient). Our results reveal a plausible mechanism underlying unexplored male-driven sex-ratio biases. We also discuss why this pattern of paternal bias can be adaptive. This research puts to rest the idea that father contribution to sex ratio variation should be disregarded in vertebrates, and will stimulate research on evolutionary constraints to sex ratios—for example, whether fathers and mothers have divergent, coinciding, or neutral sex allocation interests. Finally, these results offer a potential explanation for those intriguing cases in which there are sex ratio biases, such as in humans., Peer reviewed
DOI: http://hdl.handle.net/10261/281698, http://datadryad.org/stash/dataset/doi:10.5061/dryad.948kq
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/281698
HANDLE: http://hdl.handle.net/10261/281698, http://datadryad.org/stash/dataset/doi:10.5061/dryad.948kq
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/281698
Ver en: http://hdl.handle.net/10261/281698, http://datadryad.org/stash/dataset/doi:10.5061/dryad.948kq
Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/281698
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Digital.CSIC. Repositorio Institucional del CSIC
oai:digital.csic.es:10261/281698
Dataset. 2017
DATA FROM: A FATHER EFFECT EXPLAINS SEX-RATIO BIAS
Digital.CSIC. Repositorio Institucional del CSIC
- Malo, Aurelio F.
- Martínez-Pastor, Felipe
- García-González, Francisco
- Garde, José Julián
- Ballou, Jonathan D.
- Lacy, Robert C.
Data-Malo et al 2017
Data for the main analysis of the paper entitled "A father effect explains sex-ratio bias", relating the effects of sperm nucleus area and sperm nucleus length on offspring sex ratio (figure 1), the effects of the coefficient of inbreeding on offspring sex ratio weighing each data point for the total number of offspring (figure 2), and the effects of the coefficient of inbreeding on sperm nucleus area and sperm nucleus length (figure 3)., Sex ratio allocation has important fitness consequences, and theory predicts that parents should adjust offspring sex ratio in cases where the fitness returns of producing male and female offspring vary. The ability of fathers to bias offspring sex ratios has traditionally been dismissed given the expectation of an equal proportion of X- and Y-chromosome-bearing sperm (CBS) in ejaculates due to segregation of sex chromosomes at meiosis. This expectation has been recently refuted. Here we used Peromyscus leucopus to demonstrate that sex ratio is explained by an exclusive effect of the father, and suggest a likely mechanism by which male-driven sex-ratio bias is attained. We identified a male sperm morphological marker that is associated with the mechanism leading to sex ratio bias; differences among males in the sperm nucleus area (a proxy for the sex chromosome that the sperm contains) explain 22% variation in litter sex ratio. We further show the role played by the sperm nucleus area as a mediator in the relationship between individual genetic variation and sex-ratio bias. Fathers with high levels of genetic variation had ejaculates with a higher proportion of sperm with small nuclei area. This, in turn, led to siring a higher proportion of sons (25% increase in sons per 0.1 decrease in the inbreeding coefficient). Our results reveal a plausible mechanism underlying unexplored male-driven sex-ratio biases. We also discuss why this pattern of paternal bias can be adaptive. This research puts to rest the idea that father contribution to sex ratio variation should be disregarded in vertebrates, and will stimulate research on evolutionary constraints to sex ratios—for example, whether fathers and mothers have divergent, coinciding, or neutral sex allocation interests. Finally, these results offer a potential explanation for those intriguing cases in which there are sex ratio biases, such as in humans., Peer reviewed
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