Sexual dimorphism based on body proportions and ontogenetic changes in the Brazilian electric ray Narcine brasiliensis (von Olfers, 1831) (Chondrichthyes: Narcinidae)

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dc.contributor.authorRolim, F. A. [UNESP]
dc.contributor.authorCaltabellotta, F. P.
dc.contributor.authorRotundo, M. M.
dc.contributor.authorVaske-Júnior, T. [UNESP]
dc.contributor.institutionFisheries Institute of São Paulo
dc.contributor.institutionUniversity Center Monte Serrat – UNIMONTE
dc.contributor.institutionZoological Collection of University of Santa Cecília – UNISANTA
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T16:39:00Z
dc.date.available2018-12-11T16:39:00Z
dc.date.issued2015-01-01
dc.description.abstractSexual dimorphism in the Brazilian electric ray Narcine brasiliensis from the south‑western Atlantic coast was evaluated based on body proportions and ontogenetic changes. All regions of the body were found to have differences in body proportions between the sexes, except the spiracles. The nature of allometric and isometric relationships differed mainly in terms of the six largest body dimensions. Some of these differences can be supported by the species’ life history. Principal components analysis (PCA) and analysis of similarities (ANOSIM) distinguished the adults’ body proportions by sex. Similarity percentage analysis (SIMPER) selected six variables that best discriminated between the sexes with a cumulative difference up to 70% (tail width, disc width, length between snout and first dorsal fin, pelvic fin width, length between snout and the widest part of the disc, and disc length). It was possible to select seven stable dimensions, both ontogenetic and sexual, that are recommended for use in taxonomic studies. These dimensions were interspiracular distance, spiracle length and width, upper and lower tooth band width, pelvic fin length, and length of posterior lobe of the pelvic fin. It is important to consider the differences in body proportions within a species in order to properly characterise the population and estimate its most reliable parameters.en
dc.description.affiliationFisheries Institute of São Paulo
dc.description.affiliationOceanography Department University Center Monte Serrat – UNIMONTE
dc.description.affiliationZoological Collection of University of Santa Cecília – UNISANTA
dc.description.affiliationElasmobranch Laboratory São Paulo State University – UNESP, Coastal Campus
dc.description.affiliationBiosciences Institute São Paulo State University – UNESP
dc.description.affiliationUnespElasmobranch Laboratory São Paulo State University – UNESP, Coastal Campus
dc.description.affiliationUnespBiosciences Institute São Paulo State University – UNESP
dc.format.extent167-176
dc.identifierhttp://dx.doi.org/10.2989/1814232X.2015.1032350
dc.identifier.citationAfrican Journal of Marine Science, v. 37, n. 2, p. 167-176, 2015.
dc.identifier.doi10.2989/1814232X.2015.1032350
dc.identifier.file2-s2.0-84938882583.pdf
dc.identifier.issn1814-2338
dc.identifier.issn1814-232X
dc.identifier.scopus2-s2.0-84938882583
dc.identifier.urihttp://hdl.handle.net/11449/167953
dc.language.isoeng
dc.relation.ispartofAfrican Journal of Marine Science
dc.relation.ispartofsjr0,492
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectElasmobranchii
dc.subjectmorphometry
dc.subjectrelative growth
dc.subjectTorpediniformes
dc.titleSexual dimorphism based on body proportions and ontogenetic changes in the Brazilian electric ray Narcine brasiliensis (von Olfers, 1831) (Chondrichthyes: Narcinidae)en
dc.typeArtigo

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