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Titre du document / Document title

Human sperm competition: testis size, sperm production and rates of extrapair copulations

Auteur(s) / Author(s)

SIMMONS Leigh W. (1) ; FIRMAN Renée C. (1) ; RHODES Gillian (2) ; PETERS Marianne (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) School of Animal Biology, University of Western Australia, AUSTRALIE
(2) School of Psychology, University of Western Australia, AUSTRALIE

Résumé / Abstract

We examined the claim that sperm competition is an important selection pressure operating in human populations. We recruited 222 men and 194 women to complete a survey of their sexual behaviour. Of these, 28% of men and 22% of women reported engaging in extrapair copulations (EPCs). A review of the literature suggests that rates of extrapair paternity are in the region of 2%. These values suggest that the risk of sperm competition in humans is relatively low, in line with comparative studies of relative testis sizes of humans and other primates. Testis volume was positively correlated with the number of sperm ejaculated. However, we found no support for a recent controversial claim that the within-population frequency distribution of testis size reflects a balanced polymorphism between men who specialize in sperm competition through EPCs and men who are monogamous.

Revue / Journal Title

Animal behaviour    ISSN  0003-3472   CODEN ANBEA8 

Source / Source

2004, vol. 68 (2), pp. 297-302 [6 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1958) (Revue)

Mots-clés anglais / English Keywords

Male genital system

;

Breeding behavior

;

Vertebrata

;

Mammalia

;

Primates

;

Monogamy

;

Human

;

Testicle

;

Morphometry

;

Extra pair copulation

;

Questionnaire

;

Sexual behavior

;

Sperm competition

;

Mots-clés français / French Keywords

Appareil génital mâle

;

Comportement reproducteur

;

Vertebrata

;

Mammalia

;

Primates

;

Monogamie

;

Homme

;

Testicule

;

Morphométrie

;

Copulation hors couple

;

Questionnaire

;

Comportement sexuel

;

Compétition spermatique

;

Mots-clés espagnols / Spanish Keywords

Aparato genital macho

;

Conducta reproductora

;

Vertebrata

;

Mammalia

;

Primates

;

Monogamia

;

Hombre

;

Testículo

;

Morfometría

;

Cópula extra pareja

;

Cuestionario

;

Conducta sexual

;

Competencia espermática

;

Localisation / Location

INIST-CNRS, Cote INIST : 7067, 35400011631992.0090

Nº notice refdoc (ud4) : 16017960



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