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Activity patterns and body temperatures of two sympatric lizards (Tropidurus torquatus and Cnemidophorus ocellifer) with different foraging tactics in southeastern Brazil

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Nós estudamos a biologia termal e comparamos os padròes termais e de atividade de dois lagartos simpátricos com diferentes táticas de forrageamento (Tropidurus torquatus e Cnemidophorus ocellifer) num habitat de restinga na Reserva Florestal Vale do Rio Doce, Linhares, Brasil. Os dados mostraram que as temperaturas corporais de ambas as espécies relacionaram-se positiva e significativamente com a temperatura do substrato. A espécie forrageadora ativa, C. ocellifer, teve temperaturas médias corporais significativamente maiores (37.6 ± 2.0°C) do que o senta-e-espera T. torquatus (35.6 ± 1.9°C), e permaneceu ativo no habitat numa porçào menor de tempo (entre 8:30 e 15:00 h) do que T. torquatus (entre 7:00 e 18:00 h). Nossos resultados estào de acordo com a premissa de que espécies forrageadoras ativas teriam maiores temperaturas médias corporais e permaneceriam ativas no habitat por periodo de tempo relativamente mais curto do que espécies forrageadoras sedentárias.

Affiliations: 1: Departamento de Zoologia, P.G. Ecologia, Instituto de Biologia, C.P. 6109, Universidade Estadual de Campinas, 13081-970, Campinas, S.P., Brazil; 2: Setor de Ecologia, Instituto de Biologia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, Maracana, 20550-011, Rio de Janeiro, R.J., Brazil


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