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Endocrine correlates of intra-specific variation in the mating system of the St. Peter's fish (Sarotherodon galilaeus)

2003Journal article Restricted access
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dc.contributor.authorRos, A. F. H.
dc.contributor.authorCanario, Adelino V. M.
dc.contributor.authorCouto, Elsa
dc.contributor.authorZeilstra, IIja
dc.contributor.authorOliveira, R. F.
dc.date.accessioned2014-05-09T10:43:25Z
dc.date.available2014-05-09T10:43:25Z
dc.date.issued2003
dc.date.updated2014-05-09T09:35:04Z
dc.description.abstractThe Challenge Hypothesis postulates that androgen levels are a function of the social environment in which the individual is living. Thus, it is predicted that in polygynous males that engage in social interactions, androgen levels should be higher than in monogamous animals that engage in parental care. In this study, we tested this hypothesis at the intra-specific level using a teleost species, Sarotherodon galilaeus, which exhibits a wide variation in its mating system. Experimental groups of individually marked fish were formed in large ponds with different operational sex-ratios (OSR) to study the effects of partner availability on blood plasma levels of sex steroids [11-ketotestosterone (11-KT), testosterone (T), and 17,20B-dihydroxy-4-pregnen-3-one (17,20B-P)] and gonadosomatic index (GSI). Polygyny mostly occurred in the female biased OSR groups. 17,20B-P and gonadosomatic index did not differ among OSR groups. However, 11-KT was high in male biased OSR and positively correlated with aggressive challenges, thereby supporting the central postulate of the Challenge Hypothesis. The results of T were the inverse of those of 11-KT, probably because 11-KT is metabolized from T. 11-KT levels of polygynous males did not differ neither from those of monogamous males, nor from those of males that participated in parental care. These results do not support the expected relationships between polygyny, parental care, and androgen levels. The differences from expectations for 11-KT may be related to the fact that in S. galilaeus, the mating and the parenting phase are not clearly separated and thus, males may still fight and court while they are brooding.por
dc.identifier.citationRos, Albert F.H; Canario, Adelino V.M; Couto, Elsa; Zeilstra, IIja; Oliveira, Rui F. Endocrine correlates of intra-specific variation in the mating system of the St. Peter's fish (Sarotherodon galilaeus), Hormones and Behavior, 44, 4, 365-373, 2003.por
dc.identifier.issn0018-506X
dc.identifier.otherAUT: ACA00258;
dc.identifier.urihttp://hdl.handle.net/10400.1/3823
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subject11-ketotestosteronepor
dc.subjectTestosteronepor
dc.subject17,20B-dihydroxy-4-pregnen-3-onepor
dc.subjectGonadosomatic indexpor
dc.subjectSarotherodon galilaeuspor
dc.subjectAggressionpor
dc.subjectMating systempor
dc.subjectParental carepor
dc.subjectOperational sex-ratiopor
dc.subjectSt. Peter’s fishpor
dc.titleEndocrine correlates of intra-specific variation in the mating system of the St. Peter's fish (Sarotherodon galilaeus)por
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage373por
oaire.citation.startPage365por
oaire.citation.titleHormones and Behaviorpor
oaire.citation.volume44por
person.familyNameCanario
person.familyNameCouto
person.givenNameAdelino
person.givenNameElsa
person.identifier143624
person.identifier.ciencia-id1F1E-D3B3-F804
person.identifier.orcid0000-0002-6244-6468
person.identifier.orcid0000-0001-9336-9963
person.identifier.ridC-7942-2009
person.identifier.scopus-author-id56568523700
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication5f6e51ee-9113-469e-8b9e-f30f2d452521
relation.isAuthorOfPublicationcc3f6bfd-86b1-45b2-a629-cddf25f1c828
relation.isAuthorOfPublication.latestForDiscovery5f6e51ee-9113-469e-8b9e-f30f2d452521

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