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We compared the effects of habitat disturbance on the feeding ecology of two local populations of Tropidurus torquatus (Wied, 1820) in restinga habitats on Ilha da Marambaia, Southeastern Brazil. Both populations presented a relatively diverse diet and differ in the number (D Max = 0.22, DF = 2, p = 0.00) and volume of prey consumed (D Max = 0.82, DF = 2, p = 0.00). Ants were the most frequent and numerous preys in both areas, and plant matter and coleopterans were the most important alimentary items in volume. The population from the disturbed area presented a larger niche breadth for number of prey items consumed (Bi num = 3.06) and volume (Bi vol = 2.98), when compared to the other population (Bj num = 2.44, Bj vol = 1.52). Niche overlap was higher for number of items consumed between the populations (Oij num = 0.82) but lower for volume (Oij vol = 0.05). Our data suggest dietary differences between the two lizard populations, and these differences may be associated with environmental modifications. Our main hypothesis to explain the dietary differences is based in the Optimal Foraging Theory. However, the alimentary behavior, and consequently the diet of these lizards, seems to be constrained phylogenetically, with a pattern that may have evolved in the ancestor of all iguanids. Comparamos os efeitos da degradação ambiental sobre a ecologia alimentar de duas populações de Tropidurus torquatus (Wied, 1820) em áreas de restinga da Ilha da Marambaia, sudeste do Brasil. Ambas as populações apresentaram dieta relativamente diversa e deferiram em número (D Max = 0,22; DF = 2; p = 0,00) e volume de presas consumidas (D Max = 0,82; DF = 2; p = 0,00). Formigas foram os itens mais freqüentes e numerosos em ambas as áreas, e material vegetal e coleópteros os mais importantes em volume. A população da área perturbada apresentou maior largura de nicho alimentar para número de presas consumidas (Bi num = 3,06) e volume (Bi vol = 2,98), quando comparada à outra população (Bj num = 2,44; Bj vol = 1,52). A sobreposição de nicho foi mais marcante para o número de itens consumidos entre as populações (Oij num = 0,82) e menos marcante para volume (Oij vol = 0,05). Nossos dados sugerem diferenças nas dietas entre as duas populações de lagartos, e estas diferenças parecem estar associadas à degradação ambiental. Nossa principal hipótese para explicar as diferenças nas dietas embasa-se na Teoria do Forrageamento Ótimo. Entretanto, o comportamento alimentar, e conseqüentemente a dieta dos lagartos, mostrarem-se limitadas filogeneticamente, com um padrão que pode ter evoluído no ancestral de todos os iguanídeos

revista brasileira de zoologia

Feeding ecology of Tropidurus torquatus (Wied) (Squamata, Tropiduridae) in two areas with different degrees of conservation in Marambaia Island, Rio de Janeiro, Southeastern Brazil