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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