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Ecological observations on the leaf-litter frog Adenomera marmorata in an Atlantic rainforest area of southeastern Brazil

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We analysed the diet, pattern dispersion, calling activity and microhabitat use of the leptodactylid frog Adenomera marmorata at an Atlantic rainforest site on Ilha Grande, in southeastern Brazil. Adenomera marmorata is endemic to the Brazilian Atlantic rainforest biome, occurring in the leaf litter of forests from Rio de Janeiro state to Santa Catarina state, and this is the first ecological study of the species. It has a clumped pattern of dispersion along the forest floor. Calling activity extended from dusk to dawn, although on rainy days some individuals remained active during the daylight period. The individuals collected for diet analysis were most frequently found on the leaf-litter surface and under the leaf litter of the forest floor. Of the six potential microhabitat categories we recorded, A. marmorata used only two (leaf litter and fallen branch). We conclude that in the Atlantic forest of Ilha Grande, A. marmorata possesses crepuscular–nocturnal calling activity, and is exclusively associated with the leaf litter of the forest floor where it feeds predominantly on isopods, ants and insect larvae.
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Document Type: Research Article

Publication date: April 1, 2007

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