Abstract
We analyzed the diet and microhabitat use for two Hylodinae anurans (Cycloramphidae), Hylodes phyllodes Heyer & Cocroft, 1986 and Crossodactylus gaudichaudii Duméril & Bibron, 1841, living in sympatry at an Atlantic Rainforest area of Ilha Grande, in southeastern Brazil. The two species live syntopically at some rocky streams. The two species differed strongly in microhabitat use. Hylodes phyllodes occurred mainly on rocks, whereas C. gaudichaudii was observed mostly on the water. Regarding diet, coleopterans, hymenopterans (ants), and larvae were the most important prey item consumed by both species. Data suggest that microhabitat use appears to be an important parameter differentiating these frogs with respect to general resource utilization.
Highlights
As for other organisms, differences in resource utilization may facilitate the coexistence of species occurring in sympatry and syntopy (e.g. DUELLMAN,1978; VAN SLUYS & ROCHA, 1998; DURÉ & KEHR, 2001, 2004)
At the Atlantic Rainforest of Ilha Grande, a large island located in southern coast of the state of Rio de Janeiro, Brazil, two frog species of the cycloramphid subfamily Hylodinae, Crossodactylus gaudichaudii Duméril & Bibron, 1841 and Hylodes phyllodes Heyer & Cocroft, 1986 occur in syntopy in some localities
Crossodactylus gaudichaudii and H. phyllodes are generally found associated to streams inside the forest (HEYER & COCROFT, 1986; IZECKSOHN & CARVALHO-E-SILVA, 2001; HATANO et al, 2002)
Summary
Nós analisamos a dieta e o uso do microhabitat em duas espécies de anuros da subfamília Hylodinae (Cycloramphidae), Hylodes phyllodes Heyer & Cocroft, 1986 e Crossodactylus gaudichaudii Duméril & Bibron, 1841, que vivem em simpatria em uma área de Mata Atlântica na Ilha Grande, na região sudeste do Brasil. At the Atlantic Rainforest of Ilha Grande, a large island located in southern coast of the state of Rio de Janeiro, Brazil, two frog species of the cycloramphid subfamily Hylodinae (sensu LYNCH, 1971), Crossodactylus gaudichaudii Duméril & Bibron, 1841 and Hylodes phyllodes Heyer & Cocroft, 1986 occur in syntopy in some localities Both species are diurnal and endemic to the Atlantic Forest of the states of Rio de Janeiro and São Paulo, in southeastern Brazil (ROCHA et al, 1997; FROST, 2004). We investigate the patterns of resource utilization (food and microhabitat) in C. gaudichaudii and H. phyllodes and establish comparisons between the two species
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