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: Tatiana Miranda
Dataset: SAJH 1 2 121 130-1
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ABSTRACT: Detailed structure of the oral morphology of various developmental stages in relation to feeding behaviour of Euphlytis cyanophlyctis (Dicroglossidae) was studied for the first time with the help of light microscopy and scanning electron microscopy (SEM). Development of mouthparts began soon after hatching and at stage 25. There is no ontogenetic variation in labial teeth rows of Euphlyctis cyanophlyctis. The labial teeth row formula (LTRF) i.e. 1/2 is constant throughout the larval stages until the metamorphs stage. It is hypothesized that as an individual grows larger, the morphological changes in its feeding apparatus, including the number of teeth and gape size, allow a wider selection of prey items. The present observation revealed that the tadpole of Euphlyctis cyanophlyctis cyanophlyctis is more of a bottom dweller, scraping algae and also feeding on macrophytes with the help of its ventrally situated heavy and keratinized beaks. During the early stages of feeding, they feed mostly on detritus and plant materials and during the later stages of feeding they consumed both phytoplankton and zooplankton. Tadpoles soon stop feeding at stage 42 and after metamorphosis the froglet start feeding on a carnivorous diet. The detritus packed along the length of larval intestines was an indicative of its habitat as a benthic detritus feeder. It was also found that the tadpoles are facultative suspensionfeeders (Orton’s type 4) and wide spectrum of food choices indicated that they are highly adapted to inhabit various types of habitat, stream, ponds, lake, loticconnected shallow standing pools and ponds.Science and Technology Journal. 07/2013; 1(2):58-69.
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ABSTRACT: Leptodactylus mystaceus is distributed throughout Brazil and no information is available about its diet. Here, we analyzed the diet of L. mystaceus from Novo Progresso, Pará, Brazil. We extracted the stomachs of 25 specimens. For each prey category, we calculated the frequency (Fi%), volume (Vi%) and Feeding Index (IAi). Among the specimens analyzed, seven (28%) had empty stomachs and the other ingested eight prey categories (Araneae, Blattodea, Coleoptera, Dermaptera, Diptera adults, Diptera larva, Formicidae, and Lepidoptera), and large amounts of plant material. This suggests that L. mystaceus is a generalist species and Dermaptera was the most representative component of its diet.Herpetology Notes 02/2014; 7:31-36.