Folivory and seasonal changes in diet in Rana hexadactyla (Anura: Ranidae)
ABSTRACT The autecology of Rana hexadactyla (Lesson) was studied at a seasonal locality in south India. The herbivorous larva transforms into an insectivorous frog, and a second dietary switch from insectivory to folivory occurs in adults, with plants constituting 79.5% of the diet, by volume. A variety of invertebrates and small vertebrates is consumed, especially by the adult females before the reproductive season. Larger frogs take larger animal prey and more prey types. Monthly figures of prey diversity generally show high values during the wet months.In Rana hexadactyla, the utilization of permanent waterbodies may help buffer the impact of the long dry seasons and, together with a supply of abundant food in the form of aquatic macrophytes, is thought to be linked to the capacity of the species to spawn three times a year.
SourceAvailable from: Mareike Hirschfeld[Show abstract] [Hide abstract]
ABSTRACT: The worldwide decline of amphibian populations calls for studies concerning their ecological role within eco-systems and only knowledge about amphibian species' diets may facilitate the identification of their respective position in trophic cascades. Frog consumption by humans has recently increased to a considerable extent in some parts of West Af-rica. We analyse herein the diet of the most commonly consumed frog species, Hoplobatrachus occipitalis (Dicroglossidae), in Malanville, northern Benin. In order to determine its prey spectrum we investigated stomachs of frogs obtained from frog hunters, and stomach-flushed frogs caught by ourselves. Overall, we investigated the gut contents of 291 individuals (83 flushed, 208 dissected), 21% of which had empty stomachs. We identified Coleoptera, Lepidoptera and Formicidae as the most important prey categories in flushed frogs and Pisces, Coleoptera and Araneae in collected frog stomachs. Accord-ing to these data, H. occipitalis is an opportunistic forager, able to predate on terrestrial as well as on aquatic taxa. The prey spectrum revealed by the two different sampling methods differed only slightly. In contrast, the frequency of particular prey categories (e.g., fish) differed strongly. These differences were most probably method-based, rather than reflecting different prey availability among capture sites.Salamandra 08/2011; 47:125-132. · 1.23 Impact Factor
Dataset: Diet of Pseudis cardosoi
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ABSTRACT: Amphibians are usually generalist predators, and their diet is influenced by extrinsic (e.g. food availability) and intrinsic factors (e.g. body size and skull shape). This study aims to describe the diet of adult males and females of Leptodactylus fuscus in the Pantanal of the Miranda river and to answer the following questions: i) Are prey's maximum size and number of food items explained by the anuran's body size? ii) Are richness of morphospecies and number of food items explained by frog sex? iii) Is there diet overlap between male and female? We recorded 62 food items, belonging to seven orders of Arthropoda, and one individual of Annelida. The diet of L. fuscus was dominated by Orthoptera, followed by Coleoptera, Araneae, Hymenoptera, Blattaria, Hemiptera and Diptera. Frog's body size did not influence prey size or number of food items consumed. The number of prey and richness of morphospecies did not differ between males and females. There was low diet overlap between the sexes. Our results provide evidence for the opportunistic and generalist feeding behavior of L. fuscus.Biota Neotropica 03/2012; 12(1):99-104. DOI:10.1590/S1676-06032012000100008 · 0.69 Impact Factor