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Thierry Lodé's Scientific Works |
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Animal homosexuality |
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Animal Homosexuality - Homosexualité animale
A biological exuberance !
Animal homosexuality has mostly been regarded as a taboo topic or at least, as curious or abnormal events from a conventional standpoint. Nevertheless, numerous recent studies have revealed a growing evidence for homosexual behaviours. Neo-Darwinism longtime alleged that male homosexual behaviours chiefly result from the sexual frustration of bachelor males or revealed abnormal behaviours.
In fact, evolution theory predicts that the occurrence of non-adaptive behaviours (i.e. behaviours with no reproductive effects) must decrease in a population but homosexuality has been found as casual activities in numerous species. Thus, new theories tried to explain such a behavior :
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The aggression hypothesis argued that homosexual interactions resulted from frustration of bachelors.
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Same-sex interactions could have a social sexual role in dominance.
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Homosexuality could result from scarcity of sexual partners
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Homosexuality was thought as having a training function initiating future sexual performances (training hypothesis)
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homosexual behaviours should be regarded as cooperative either by maintaining pair bonds in birds dominance hierarchy/cooperation
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Regulation of population dynamics
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according to the sneaky male theory, a male may gain some access to females by being tolerated by another dominant male
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Homosexuality may result from a biased sex-ratio
- it could be also argued that homosexuality is a part of the natural repertoire of sexual behaviour
Actually, deliberate exclusive homosexuality in a solitary species such as the European polecat Mustela putorius (free choice hypothesis, Lodé 2006) apparently serves no adaptive function. Deliberate homosexual behaviour was never documented in other non-social and non-cooperative species, competing for mates and thus addresses crucial evolutionary issues.
in Th Lodé - La GUERRE DES SEXES (2006) Eds Odile Jacob .
Download in PDF
Citation of this paper:
Lodé T 2007 Animal Homosexuality: a biological exuberance ! Evolutionary Ecology and Ethology Univ Rennes1, http://evolutionaryecology.fr.gd/Animal-homosexuality.htm |
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VERSION FRANCAISE
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March 2011 : new book |
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June 2010 : new book |
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conservation biology, écology, éthology, génétique des populations, polygynie, polyandry, sélection d'habitat, systèmes sexuels, spéciation, conflit sexuel, guerre des sexes, écologie évolutive, thierry lodé, lode, evolutionary ecology, sexual conflict, animaux, laboratoire de recherches, co-évolution antagoniste, stratégies sexuelles, umr rennes 1, ethology, polecat, cnrs, Conservation Plan for the European mink, angers, biodiversité, homosexual, castor, beaver, Animal Homosexuality, Sexual propaganda, sexual selection
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