Sexual dimorphism in the Neotropical lizard, Tropidurus torquatus (Squamata, Tropiduridae)

Pinto, Adriana C. S.; Wiederhecker, Helga C.; Colli, Guarino R.

doi:10.1163/1568538054253384

Cited by 56 publications

(27 citation statements)

References 65 publications

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“…Estas diferenças normalmente são resultantes de pressões distintas sobre os sexos (Bull & Pamula 1996) ou podem ser produzidas pela alocação diferencial de energia para o crescimento e para reprodução entre machos e fê-meas (Pinto 1999, Pinto et al 2005. Para Tropidurus oreadicus foi verificado dimorfismo sexual em tamanho, tanto na fase jovem, na qual as fêmeas foram maiores que os machos, quanto na fase adulta, na qual ocorreu uma inversão em relação ao sexo de maior tamanho.…”

Section: Discussionunclassified

“…Já as fêmeas selecionam os machos em relação as suas características morfológicas externas como maior tamanho ou robustez, de modo a garantir melhores genes para sua prole como já sugerido para T. oreadicus por Faria (2001) e para T. itambere por Van-Sluys (1993b) e Faria (2001. Os menores custos associados à produção de gametas podem beneficiar machos maiores com relação à aquisição e defesa de territórios, "displays" sexuais mais elaborados para atração das fêmeas entre outros como sugerido por Pinto (1999) e Pinto et al (2005) …”

Section: Discussionunclassified

“…Para Tropidurus algumas informações sobre hábitos alimentares, uso de hábitat, atividade, reprodução, dinâmica populacional, comportamento entre outros fatores estão disponíveis para algumas espécies (e.g. Colli et al 1992, Vitt et al 1996, Teixeira & Giovanelli 1999, Van-Sluys et al 2004, Pinto et al 2005, Kiefer et al 2007). Porém, é sempre interessante buscar novos conhecimentos para espécies de ampla distribuição geográfica, em diferentes localidades e condições ambientais.…”

Section: Introductionunclassified

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História natural de Tropidurus oreadicus em uma área de cerrado rupestre do Brasil Central

et al. 2007

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Ecological aspects and of the reproductive biology of Tropidurus oreadicus was investigated in a rocky cerrado area in Central Brazil. It was studied the morphometry, the microhabitat use, the activity pattern, the diet and the characteristics of the reproductive biology of T. oreadicus in Cocalzinho-GO, from April to September/2003. They are sexually dimorphic animals, with adult males larger than females. The preferential microhabitat used by the species was the surface of the rocks (saxicolous habit). The species shows a unimodal activity pattern. It was frequently observed resting and exposed to the sun between 9:00 and 10:59 hours. This T. oreadicus population feed upon ants, larvae of insects and beetles. Besides it presented ontogenetics shift and intersexual differences in the diet. Probably these differences were associated with the differentiated allocation of the resources for the growth or production of gamete. The reproduction is probably seasonal occurring mainly during the months of higher rainfall.Keywords Aspectos ecológicos e da biologia reprodutiva de Tropidurus oreadicus foram investigados em uma área de cerrado rupestre do Brasil Central. Foram estudados a morfometria, o uso do microhábitat, o padrão de atividade, a dieta e características da biologia reprodutiva de T. oreadicus em Cocalzinho -GO, de abril a setembro/2003. São animais sexualmente dimórficos, com os machos adultos maiores que as fêmeas. O microhábitat preferencial utilizado pela espécie foi a superfície das rochas (hábito saxícola). A espécie mostrou padrão de atividade unimodal. Foram frequentemente observados parados e expostos ao sol entre 9:00 e 10:59 horas. A alimentação desta população de T. oreadicus é baseada em formigas, larvas de inseto e besouros. Além disso, apresentaram mudanças ontogenéticas e diferenças intersexuais na dieta. Provavelmente essas diferenças estejam associadas à alocação diferenciada dos recursos para o crescimento ou produção dos gametas. A reprodução é provavelmente sazonal ocorrendo principalmente nos meses de maior pluviosidade.Palavras-chave: nicho, dieta, atividade, ecologia, Tropidurus.

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Section: Discussionunclassified

Section: Introductionunclassified

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História natural de Tropidurus oreadicus em uma área de cerrado rupestre do Brasil Central

et al. 2007

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“…Adult males have wider heads and thinner bodies than females of the same body size. This is a common sexually dimorphic pattern observed in Tropidurus that facilitates sex identification of adults (Pinto et al, 2005;Ribeiro et al, 2012). Sex determination of juveniles is not as easy based on external morphology alone because young individuals lack the attributes listed above.…”

Section: Methodsmentioning

confidence: 99%

Supplemental Material for 'A new Tropidurus (Tropiduridae) from the semiarid Brazilian Caatinga : evidence for conflicting signal between mitochondrial and nuclear loci affecting the phylogenetic reconstruction of South American collared lizards. (American Museum novitates, no. 3852)'

Carvalho¹,

Sena²,

Peloso³

et al. 2016

American Museum of Natural History Research Library

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Tropidurus Wied, 1825, is one of the most ubiquitous lizard genera distributed in open habitats of tropical and subtropical South America. Nevertheless, the broad representation of specimens of this group in scientific collections is hardly reflected in our knowledge of its taxonomic diversity. Most species currently assigned to Tropidurus began to be uncovered in the early 1980's and additional populations in need of formal taxonomic treatment have been cataloged ever since. Herein, we name Tropidurus sertanejo, n. sp., a new species of the T. torquatus group endemic to the semiarid Brazilian Caatinga. Tropidurus sertanejo, n. sp., is currently known from two isolated populations in the municipalities of Caetité and Ibotirama Bahia, Brazil. This is the only species of the T. torquatus group lacking granular mite pockets on the lateral neck, and it is also diagnosable by having a conspicuous bronze-colored head, a light-brown dorsal body with small pale salmon spots, and small body size in comparison with most congeners. Phylogenetic analyses recovered a paraphyletic Tropidurus, but firmly supported T. sertanejo, n. sp., as member of a monophyletic T. torquatus species group. Trees generated by independent analyses of nuclear and mitochondrial sequence data conflicted with our total evidence phylogenetic hypotheses. Since topological disagreements were detected among phylogenetic trees resulting from maximum parsimony (MP) and maximum likelihood (ML) reconstructions, and MP analyses do not require distinct evolutionary models or partition schemes to be defined prior to conduction of phylogenetic reconstruction, these factors were considered unlikely to explain all the variation in the observed results, favoring the interpretation of conflicting phylogenetic signal. Because detailed information on the distribution, population size, and ecological requirements of T. sertanejo, n. sp., are currently unavailable, we recommend the species to be listed as "data deficient" following the rules proposed by IUCN.

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“…Lizards in particular provide the opportunity for comparative studies and are a good model for studying the evolution of SSD, because this group presents remarkable variation in both direction and magnitude of SSD (Cox et al, 2003). Male and female lizards may differ in many traits, such as coloration, body shape, and size (Pinto et al, 2005;Ribeiro et al, 2010). Males are larger than females in the majority of lizards, although female-biased SSD is common and occurs in nearly every family.…”

Section: Introductionmentioning

confidence: 99%

Sexual dimorphism in Trachylepis vittata (Olivier, 1804) (Sauria: Scincidae) in the Zagros Mountains, western Iran

Rastegar–Pouyani¹,

Fattahi²

2015

Turk J Zool

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We describe sexual dimorphism in coloration, size, and shape in 48 specimens (19 males and 29 females) of the bridled skink, Trachylepis vittata (Olivier, 1804), collected from western regions of the Iranian Plateau. For the analyses, we used 29 metric and 9 meristic characters. Our study showed the existence of slight sexual size dimorphism in body and head size between the sexes. Males had significantly smaller heads and narrower bodies than females. Furthermore, males and females were different in the structure of the cloaca. The possible scenarios behind sexual dimorphism in this lizard are discussed.

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Sexual dimorphism in the Neotropical lizard, Tropidurus torquatus (Squamata, Tropiduridae)

Cited by 56 publications

References 65 publications

História natural de Tropidurus oreadicus em uma área de cerrado rupestre do Brasil Central

História natural de Tropidurus oreadicus em uma área de cerrado rupestre do Brasil Central

Supplemental Material for 'A new Tropidurus (Tropiduridae) from the semiarid Brazilian Caatinga : evidence for conflicting signal between mitochondrial and nuclear loci affecting the phylogenetic reconstruction of South American collared lizards. (American Museum novitates, no. 3852)'

Sexual dimorphism in Trachylepis vittata (Olivier, 1804) (Sauria: Scincidae) in the Zagros Mountains, western Iran

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