Sex ratio evolution under probabilistic sex determination

T. Paixao, S. Phadke, R. Azevedo, R. Zufall, Evolution; International Journal of Organic Evolution 65 (2011) 2050–2060.

Download
No fulltext has been uploaded. References only!

Journal Article | Published
Author
; ; ;
Abstract
Sex allocation theory has been remarkably successful at explaining the prevalence of even sex ratios in natural populations and at identifying specific conditions that can result in biased sex ratios. Much of this theory focuses on parental sex determination (SD) strategies. Here, we consider instead the evolutionary causes and consequences of mixed offspring SD strategies, in which the genotype of an individual determines not its sex, but the probability of developing one of multiple sexes. We find that alleles specifying mixed offspring SD strategies can generally outcompete alleles that specify pure strategies, but generate constraints that may prevent a population from reaching an even sex ratio. We use our model to analyze sex ratios in natural populations of Tetrahymena thermophila, a ciliate with seven sexes determined by mixed SD alleles. We show that probabilistic SD is sufficient to account for the occurrence of skewed sex ratios in natural populations of T. thermophila, provided that their effective population sizes are small. Our results highlight the importance of genetic drift in sex ratio evolution and suggest that mixed offspring SD strategies should be more common than currently thought.
Publishing Year
Date Published
2011-03-01
Journal Title
Evolution; International Journal of Organic Evolution
Volume
65
Issue
7
Page
2050 - 2060
IST-REx-ID

Cite this

Paixao T, Phadke S, Azevedo R, Zufall R. Sex ratio evolution under probabilistic sex determination. Evolution; International Journal of Organic Evolution. 2011;65(7):2050-2060. doi:10.1111/j.1558-5646.2011.01266.x
Paixao, T., Phadke, S., Azevedo, R., & Zufall, R. (2011). Sex ratio evolution under probabilistic sex determination. Evolution; International Journal of Organic Evolution, 65(7), 2050–2060. https://doi.org/10.1111/j.1558-5646.2011.01266.x
Paixao, Tiago, Sujal Phadke, Ricardo Azevedo, and Rebecca Zufall. “Sex Ratio Evolution under Probabilistic Sex Determination.” Evolution; International Journal of Organic Evolution 65, no. 7 (2011): 2050–60. https://doi.org/10.1111/j.1558-5646.2011.01266.x.
T. Paixao, S. Phadke, R. Azevedo, and R. Zufall, “Sex ratio evolution under probabilistic sex determination,” Evolution; International Journal of Organic Evolution, vol. 65, no. 7, pp. 2050–2060, 2011.
Paixao T, Phadke S, Azevedo R, Zufall R. 2011. Sex ratio evolution under probabilistic sex determination. Evolution; International Journal of Organic Evolution. 65(7), 2050–2060.
Paixao, Tiago, et al. “Sex Ratio Evolution under Probabilistic Sex Determination.” Evolution; International Journal of Organic Evolution, vol. 65, no. 7, Wiley-Blackwell, 2011, pp. 2050–60, doi:10.1111/j.1558-5646.2011.01266.x.

Export

Marked Publications

Open Data IST Research Explorer

Search this title in

Google Scholar