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Social cues in the expression of sequential alternative reproductive tactics in young males of the peacock blenny, Solaria pavo

2012-10Journal article Open Access
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dc.contributor.authorFagundes, Teresa
dc.contributor.authorSimões, Mariana G.
dc.contributor.authorGonçalves, David
dc.contributor.authorOliveira, Rui F.
dc.date.accessioned2018-12-07T14:58:07Z
dc.date.available2018-12-07T14:58:07Z
dc.date.issued2012-10
dc.description.abstractPhenotypic change in response to variation in environmental cues has been widely documented in fish. Transitions in social dominance, in particular, have been shown to induce a rapid switch in reproductive phenotypes in many species. However, this effect has been mainly studied in adults and focused on behavioural transitions. The way social cues constraint the phenotypic development of juveniles remains poorly studied in fish. We tested the importance of social dominance and density in the phenotypic development of juveniles of the peacock blenny Solaria pavo. This species shows sequential male alternative reproductive tactics. In the first breeding season males can reproduce as nest-holders or as parasitic males (female-mimicking), or postpone reproduction; from the following season afterwards all males reproduce as nest-holders. Parasitic males have relatively larger testes that lack a testicular gland, present in the testes of nest-holders. The testicular gland is the main source of androgens in the testes and accordingly nest-holders have higher circulating androgen levels. In addition, exogenous androgen administration to parasitic males promotes the development of secondary sexual characters (SSC) only present in nest-holders such as a head crest and an anal gland. We raised juveniles under a high or low-density treatment and monitored social interactions for 1 month. No significant effect of density on the development of juvenile males was detected. However, within each replicate, the relative body size of juvenile males at the beginning of the experiment determined their dominance status, with dominant males developing towards the nest-holder morphotype. Dominant males engaged in more nest defence behaviour, showed larger testicular glands, had higher levels of 11-ketotestosterone (11-KT) and testosterone (T) and developed more SSC, as compared to subordinate males. However, these effects of social dominance were moderated by body condition as only dominant males in good body condition developed SSC. The effect of social dominance and of the area of the testicular gland on the development of SSC was mediated by 11-KT and on the expression of nest defence behaviour by T. Interestingly, in spite of the higher androgen levels and more pronounced morphologic development of SSC in dominant individuals, gonadal development was independent of social dominance and most fish still had underdeveloped testis at the end of the experiment. In conclusion, social dominance promoted the development of the testicular gland, an increase in circulating androgen levels and the development of SSC, but did not promote testicular development. This suggests a dissociation of mechanisms underlying sexual maturation and the expression of male reproductive traits. This dissociation seems to be the key for the occurrence of female-mimicking males in this species, which are sexually mature despite lacking the SSC typical of nest-holdets. (C) 2012 Elsevier Inc. All rights reserved.
dc.description.sponsorshipR&D Units Plurianual Program (R&D unit) from the Portuguese Foundation for Science and Technology (FCT) [331/2001]; FCT [SFRH/BD/6502/2001]; [POCTI/BSE/38395/2001]; [PTDC/MAR/71351/2006]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doihttps://doi.org/ 10.1016/j.physbeh.2012.07.011
dc.identifier.issn0031-9384
dc.identifier.urihttp://hdl.handle.net/10400.1/11865
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationHormones and life-history trade-offs and plasticity: a study on alternative reproductive tactics in blenniid fish
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectFish Salaria-Pavo
dc.subjectMale common carp
dc.subjectChallenge hypothesis
dc.subjectSancassania Berlesei
dc.subjectPubertal development
dc.subjectLength dimorphism
dc.subjectCyprinus-Carpio
dc.subjectMating tactics
dc.subjectSneaker males
dc.subjectAndrogens
dc.subjectAlternative reproductive tactics
dc.subjectSocial dominance
dc.subjectAndrogens
dc.subject11-Ketotestosterone
dc.subjectBody condition
dc.subjectCortisol
dc.titleSocial cues in the expression of sequential alternative reproductive tactics in young males of the peacock blenny, Solaria pavo
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleHormones and life-history trade-offs and plasticity: a study on alternative reproductive tactics in blenniid fish
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCTI%2FBSE%2F38395%2F2001/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FMAR%2F71351%2F2006/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI-2010/SFRH%2FBD%2F6502%2F2001/PT
oaire.citation.endPage291
oaire.citation.issue3
oaire.citation.startPage283
oaire.citation.titlePhysiology & Behavior
oaire.citation.volume107
oaire.fundingStreamPOCI
oaire.fundingStream3599-PPCDT
oaire.fundingStreamPOCI-2010
person.familyNameGoncalves
person.givenNameDavid
person.identifier.ciencia-id331D-3437-C4CD
person.identifier.orcid0000-0001-6851-7215
person.identifier.ridL-3514-2016
person.identifier.scopus-author-id7005392651
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscovery66201ec2-b295-4b89-ac7c-b9af369d552f
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