Diet of the Smoky Jungle Frog Leptodactylus pentadactylus (Anura, Leptodactylidae) in an urban forest fragment and in a pristine forest in Central Amazonia, Brazil

André Pedro do Couto, Ronis Da Silveira, Amadeu V. M. V. Soares, Marcelo Menin

Abstract


Understanding the natural history of amphibians in human altered habitats is essential to develop conservation and management actions. In this study, we determined the composition of the diet of Leptodactylus pentadactylus in an urban forest fragment and in a preserved forest, both placed in Central Amazonia, Brazil. Diet samples were obtained by stomach flushing of 33 individuals. Each prey item was measured and identified according to its taxonomic group. For each taxon found in the stomachs we determined the number of items, the percentages of volume, frequency and occurrence, and the index of relative importance. We tested for differences in trophic niche breadth, and the relationship between individual size and prey volume. We identified a total of 127 prey items belonging to 18 different taxonomic groups. Arthropods were the main source of food on both areas. Based on the index of relative importance Araneae, Scorpiones, Diplopoda, and Coleoptera were the most important prey items in the forest fragment while Araneae, Diplopoda, Coleoptera, and Diptera were the most important prey items in the preserved forest. Additionally, one small lizard species, Alopoglossus angulatus, was consumed by one of the frogs at the forest fragment. There was no significant difference in the trophic niche breath values obtained between the areas, and no correlation between the largest prey items consumed and body sizes of the frog individuals. Overall, the diet of the L. pentadactylus was similar in both sites and follows a generalist and opportunistic pattern resembling other species of medium or large-sized Leptodactylus.

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