Book contents
- Frontmatter
- Contents
- List of contributors
- Acknowledgments
- PART I INTRODUCTION AND OVERVIEW
- PART II MATE GUARDING
- PART III INTRAVAGINAL TACTICS: SPERM COMPETITION AND SEMEN DISPLACEMENT
- 6 Sperm competition and its evolutionary consequences in humans
- 7 The semen-displacement hypothesis: semen hydraulics and the intra-pair copulation proclivity model of female infidelity
- 8 The psychobiology of human semen
- 9 Mate retention, semen displacement, and sperm competition in humans
- 10 Preeclampsia and other pregnancy complications as an adaptive response to unfamiliar semen
- PART IV ASSESSING PATERNITY: THE ROLE OF PATERNAL RESEMBLANCE
- Index
- References
6 - Sperm competition and its evolutionary consequences in humans
Published online by Cambridge University Press: 14 January 2010
- Frontmatter
- Contents
- List of contributors
- Acknowledgments
- PART I INTRODUCTION AND OVERVIEW
- PART II MATE GUARDING
- PART III INTRAVAGINAL TACTICS: SPERM COMPETITION AND SEMEN DISPLACEMENT
- 6 Sperm competition and its evolutionary consequences in humans
- 7 The semen-displacement hypothesis: semen hydraulics and the intra-pair copulation proclivity model of female infidelity
- 8 The psychobiology of human semen
- 9 Mate retention, semen displacement, and sperm competition in humans
- 10 Preeclampsia and other pregnancy complications as an adaptive response to unfamiliar semen
- PART IV ASSESSING PATERNITY: THE ROLE OF PATERNAL RESEMBLANCE
- Index
- References
Summary
Identifying sperm competition
Sexual selection is the mechanism that favors an increase in the frequency of alleles associated with reproduction (Darwin, 1871). Darwin distinguished sexual selection from natural selection, but today most evolutionary scientists combine the two concepts under the name, natural selection. Sexual selection is composed of intrasexual competition (competition between members of the same sex for sexual access to members of the opposite sex) and intersexual selection (differential mate choice of members of the opposite sex). Focusing mainly on precopulatory adaptations associated with intrasexual competition and intersexual selection, postcopulatory sexual selection was largely ignored even a century after the presentation of sexual selection theory. Parker (1970) was the first to recognize that male–male competition may continue even after the initiation of copulation when males compete for fertilizations. More recently, Thornhill (1983) and others (e.g. Eberhard, 1996) recognized that intersexual selection may also continue after the initiation of copulation when a female biases paternity between two or more males' sperm. The competition between males for fertilization of a single female's ova is known as sperm competition (Parker, 1970), and the selection of sperm from two or more males by a single female is known as cryptic female choice (Eberhard, 1996; Thornhill, 1983). Although sperm competition and cryptic female choice together compose postcopulatory sexual selection (see Table 6.1), sperm competition is often used in reference to both processes (e.g. Baker & Bellis, 1995; Birkhead & Møller, 1998; Simmons, 2001; Shackelford, Pound, & Goetz, 2005).
- Type
- Chapter
- Information
- Female Infidelity and Paternal UncertaintyEvolutionary Perspectives on Male Anti-Cuckoldry Tactics, pp. 103 - 128Publisher: Cambridge University PressPrint publication year: 2006
References
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