Morphological variation and sexual dimorphism in two sympatric dipsadine snakes from Southern Brazil

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dc.contributorLaboratório de Ecologia e Evoluçãopt_BR
dc.contributor.authorLoebens, Luizapt_BR
dc.contributor.authorHendges, Carla Deonisiapt_BR
dc.contributor.authorCechin, Sonia Zaninipt_BR
dc.contributor.authorAlmeida-Santos, Selma Mariapt_BR
dc.identifier.citationLoebens L, Hendges CD, Cechin SZ, Almeida-Santos SM. Morphological variation and sexual dimorphism in two sympatric dipsadine snakes from Southern Brazil. Zool Anz. 2019 May;280,42-51. doi:10.1016/j.jcz.2019.03.004.pt_BR
dc.description.abstractSnakes have high morphological variation, including between sexes. Most of these variations are evidenced only by linear measurements, which are generally restricted to size traits. Using traditional and geometric morphometrics methods we analyze how body size attributes and head size and shape varies between sexes and species of two sympatric Tachymenini snakes, Thamnodynastes strigatus and Tomodon dorsatum. We took body size measurements from 87 specimens of T. strigatus and 83 specimens of T. dorsatum. We also extracted head shape and size of 146 specimens of T. strigatus and 156 specimens of T. dorsatum. Our results showed sexual differences in some body size attributes and in head shape and size. Females of both species had larger SVL, BM, HW, BW and heads than in males. But, T. strigatus is not sexually dimorphic in head size. Females of the T. strigatus also exhibited an enlargement of the parietal region compared to the males, while T. dorsatum females exhibited a wider snout than males. These sexual differences could be a result of fecundity selection and may also indicate that females consume larger preys than conspecific males. At the species level, T. strigatus is larger in body and head size than T. dorsatum. The head shape of T. strigatus is characterized by a more elongated head with larger frontal and prefrontal scales and slender snout compared to T. dorsatum. Shape differences between these two snakes probably evolved in association with divergences in habitat use (e.g. terrestrial and arboreal) and diet specialization (e.g. piscivory, and malacophagy).pt_BR
dc.description.sponsorship(CAPES) Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.description.sponsorship(CNPq) Conselho Nacional de Desenvolvimento Científico e Tecnológicopt_BR
dc.format.extentp. 42-51pt_BR
dc.relation.ispartofZoologischer Anzeigerpt_BR
dc.titleMorphological variation and sexual dimorphism in two sympatric dipsadine snakes from Southern Brazilpt_BR
dc.contributor.external(UFSM) Universidade Federal de Santa Mariapt_BR
dc.subject.keywordBody sizept_BR
dc.subject.keywordComparative morphologypt_BR
dc.subject.keywordgeometric morphometricspt_BR
dc.subject.keywordHead shapept_BR
dc.relation.ispartofabbreviatedZool Anzpt_BR
dc.identifier.citationabntv. 280, p. 42-51, mai. 2019pt_BR
dc.identifier.citationvancouver2019 May;280,42-51pt_BR
dc.contributor.butantanAlmeida-Santos, Selma Maria|:Pesquisador|:Laboratório de Ecologia e Evolução|:pt_BR
dc.sponsorship.butantan(CNPq) Conselho Nacional de Desenvolvimento Científico e Tecnológico¦¦309095/2016-6pt_BR
dc.sponsorship.butantan(CNPq) Conselho Nacional de Desenvolvimento Científico e Tecnológico¦¦311532/2015-2pt_BR
dc.sponsorship.butantan(CAPES) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior¦¦001pt_BR
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