Article

Diet, microhabitat and time of activity in a Pristimantis (Anura, Strabomantidae) assemblage

Phyllomedusa : Journal of Herpetology 12/2008; 7(2). DOI: 10.11606/issn.2316-9079.v7i2p109-119
Source: DOAJ

ABSTRACT

We tested if the richness and abundance of six closely related species of Pristimantis significantly varied among three transects located at different distances from a creek in an Andean cloud forest. We found that richness and abundance of frogs varied significantly among transects, being the transect located at the forest interior the richest in frog species and number of individuals. We chose these more crowded sites to evaluate resource use differences among the species. We evaluated ecological variables such as microhabitat, diet, and time of activity in these speciesthat are similar in morphology and body size, to determine whether they have differences in the use of these resources. Most specimens perch on leaves at heights within 1.5 and 2.0 m of the ground and are nocturnal; only P. douglasi was found with diurnal and nocturnal activity. The species had similar diets, they ingested a wide spectrum of prey sizes that are similar among species, months, and between transects. Almost all collected frogs were juveniles and were found during every single month of sampling suggesting continuous reproduction; however, adults and juveniles of P.douglasi were absent during some of the drier months, indicating seasonality. Thus, we found that most of these Pristimantis species occupy the forest interior and that there is no a strong segregation in the use of the evaluated resources, only one species had a slight difference in activity and reproductive time.

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Available from: Martha Patricia Ramirez Pinilla
    • "Craugastor raniformis se comporta como un depredador al acecho ( " sit-and-wait " ), debido al alto porcentaje de estómagos vacíos, bajo número de presas promedio ingeridas, valor alto de amplitud del nicho alimentario y presas relativamente grandes (Vitt & Caldwell 2014). Las presas más importantes en su dieta (ortópteros, coleópteros y diplópodos) concuerdan con los resultados obtenidos para especies congéneres en otros lugares y Eleutherodactylus (género al que pertenecía anteriormente ) con hábitos similares (Parmelee 1999, Whitfield & Donnelly 2006, Arroyo et al. 2008, Martínez-Coronel & Pérez-Gutiérrez 2011). Sin embargo, los ejemplares analizados para el presente trabajo consumieron una menor riqueza de presas en comparación con los estudios anteriormente citados. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We characterize the diet of Craugastor raniformis, a terrestrial frog that inhabits the tropical dry forest in Colombia. The diet is constituted mostly of orthopterans, millipedes, arachnids and ants. Considering the morphological characteristics of this species, diet composition, gut vacuity index, trophic niche breadth and diversity, we consider this species would behave like a sit and wait predator.
    No preview · Article · Sep 2015
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    • "Craugastor raniformis se comporta como un depredador al acecho ( " sit-and-wait " ), debido al alto porcentaje de estómagos vacíos, bajo número de presas promedio ingeridas, valor alto de amplitud del nicho alimentario y presas relativamente grandes (Vitt & Caldwell 2014). Las presas más importantes en su dieta (ortópteros, coleópteros y diplópodos) concuerdan con los resultados obtenidos para especies congéneres en otros lugares y Eleutherodactylus (género al que pertenecía anteriormente ) con hábitos similares (Parmelee 1999, Whitfield & Donnelly 2006, Arroyo et al. 2008, Martínez-Coronel & Pérez-Gutiérrez 2011). Sin embargo, los ejemplares analizados para el presente trabajo consumieron una menor riqueza de presas en comparación con los estudios anteriormente citados. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We characterize the diet of Craugastor raniformis, a terrestrial frog that inhabits the tropical dry forest in Colombia. The diet is constituted mostly of orthopterans, millipedes, arachnids and ants. Considering the morphological characteristics of this species, diet composition, gut vacuity index, trophic niche breadth and diversity, we consider this species would behave like a sit and wait predator.
    Full-text · Article · Mar 2015
    • "Craugastor raniformis se comporta como un depredador al acecho ( " sit-and-wait " ), debido al alto porcentaje de estómagos vacíos, bajo número de presas promedio ingeridas, valor alto de amplitud del nicho alimentario y presas relativamente grandes (Vitt & Caldwell 2014). Las presas más importantes en su dieta (ortópteros, coleópteros y diplópodos) concuerdan con los resultados obtenidos para especies congéneres en otros lugares y Eleutherodactylus (género al que pertenecía anteriormente ) con hábitos similares (Parmelee 1999, Whitfield & Donnelly 2006, Arroyo et al. 2008, Martínez-Coronel & Pérez-Gutiérrez 2011). Sin embargo, los ejemplares analizados para el presente trabajo consumieron una menor riqueza de presas en comparación con los estudios anteriormente citados. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We characterize the diet of Craugastor raniformis, a terrestrial frog that inhabits the tropical dry forest in Colombia. The diet is constituted mostly of orthopterans, millipedes, arachnids and ants. Considering the morphological characteristics of this species, diet composition, gut vacuity index, trophic niche breadth and diversity, we consider this species would behave like a sit and wait predator.
    No preview · Article · Jan 2015
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