Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1554
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dc.contributor.authorOliveira, Rui Filipe-
dc.contributor.authorSilva, Ana-
dc.contributor.authorCanário, Adelino V. M.-
dc.date.accessioned2012-07-16T16:55:22Z-
dc.date.available2012-07-16T16:55:22Z-
dc.date.issued2009-
dc.identifier.citationProceedings of the Royal Society B: Biological Sciences, 276, 2249-2256por
dc.identifier.issn1471-2954-
dc.identifier.urihttp://hdl.handle.net/10400.12/1554-
dc.description.abstractAnimal conflicts are influenced by social experience such that a previous winning experience increases the probability of winning the next agonistic interaction, whereas a previous losing experience has the opposite effect. Since androgens respond to social interactions, increasing in winners and decreasing in losers, we hypothesized that socially induced transient changes in androgen levels could be a causal mediator of winner/loser effects. To test this hypothesis, we staged fights between dyads of size-matched males of the Mozambique tilapia (Oreochromis mossambicus). After the first contest, winners were treated with the antiandrogen cyproterone acetate and losers were supplemented with 11-ketotestosterone. Two hours after the end of the first fight, two contests were staged simultaneously between the winner of the first fight and a naive male and between the loser of first fight and another naive male. The majority (88%) of control winners also won the second interaction, whereas the majority of control losers (87%) lost their second fight, thus confirming the presence of winner/loser effects in this species. As predicted, the success of anti-androgen-treated winners in the second fight decreased significantly to chance levels (44%), but the success of androgenized losers (19%) did not show a significant increase. In summary, the treatment with anti-androgen blocks the winner effect, whereas androgen administration fails to reverse the loser effect, suggesting an involvement of androgens on the winner but not on the loser effect.por
dc.language.isoengpor
dc.publisherThe Royal Societypor
dc.rightsrestrictedAccesspor
dc.subjectSocial experiencepor
dc.subjectWinner effectpor
dc.subjectAndrogenspor
dc.subjectTestosteronepor
dc.subjectAggressionpor
dc.titleWhy do winners keep winning? Androgen mediation of winner but not loser effects in cichlid fishpor
dc.typearticlepor
degois.publication.firstPage2249por
degois.publication.lastPage2256por
degois.publication.locationLondonpor
degois.publication.titleProceedings of the Royal Society B: Biological Sciencespor
dc.peerreviewedyespor
degois.publication.volume276por
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