Key Points
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Postcopulatory sexual selection (PCSS) arises from widespread sexual promiscuity and operates through competition of the ejaculates of different males over fertilization (sperm competition), choice of sperm by the female (cryptic female choice) and the interaction between them.
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In some cases, the outcome of postcopulatory mechanisms can be determined by the combination of the male and female (or sperm and ova) genotypes, resulting in non-directional PCSS.
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In others, both sperm competition and cryptic female choice generate directional selection, accounting for the coevolution of extreme reproductive traits in both sexes.
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Inter-sexual coevolution driven by PCSS is characterized by extremely high rates of molecular substitution, mediating the rapid evolution of reproductive morphology, behaviour and physiology, which can lead to population divergence, reproductive isolation and speciation.
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Because the reproductive interests of males and females typically diverge, PCSS could be a potent broker of rapid antagonistic inter-sexual coevolution, resulting, at different coevolutionary stages, in the spread of sexually antagonistic alleles, and the evolution of their sex limitation and/or of the sex-biased control of their transmission.
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Although the study of PCSS focused initially on evolutionary issues and behavioural/physiological mechanisms, genetics will become increasingly important, both in determining the mechanisms of PCSS and in testing evolutionary ideas.
Abstract
The female reproductive tract is where competition between the sperm of different males takes place, aided and abetted by the female herself. Intense postcopulatory sexual selection fosters inter-sexual conflict and drives rapid evolutionary change to generate a startling diversity of morphological, behavioural and physiological adaptations. We identify three main issues that should be resolved to advance our understanding of postcopulatory sexual selection. We need to determine the genetic basis of different male fertility traits and female traits that mediate sperm selection; identify the genes or genomic regions that control these traits; and establish the coevolutionary trajectory of sexes.
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Glossary
- SEXUALLY ANTAGONISTIC GENE
-
A gene whose expression or the effect of whose expression is beneficial in one sex but harmful in the other.
- ANISOGAMY
-
The condition in which the male and female gametes are of different sizes.
- CLADE
-
A lineage of organisms or alleles that comprises an ancestor and all its descendants.
- PROTURANS
-
(or Protura). Minute soil-inhabiting insects (hexapods) that are characterized by a lack of eyes and antennae, a 12-segmented abdomen and development by the indefinite addition of segments at each moult.
- SPERM CAPACITATION
-
The state of physiological readiness to fertilize an ovum. Freshly ejaculated mammalian sperm are incapable of fertilization and require a period of time in the female tract to acquire this ability.
- DIOECIOUS
-
Species in which the sexes are in separate individuals.
- REPLACEMENT SITE
-
Any position within a gene at which a point mutation alters the encoded amino-acid sequence.
- QUANTITATIVE TRAIT LOCUS
-
(QTL). A genetic locus that is identified through the statistical analysis of complex traits (such as plant height or body weight). These traits are typically affected by more than one gene and also by the environment.
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Birkhead, T., Pizzari, T. Postcopulatory sexual selection. Nat Rev Genet 3, 262–273 (2002). https://doi.org/10.1038/nrg774
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DOI: https://doi.org/10.1038/nrg774
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