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Feeding ecology, reproductive biology, and sexual dimorphism of Boana raniceps (Anura: Hylidae) in an area of Caatinga, northeastern Brazil
Ecología alimentaria, biología reproductiva y dimorfismo sexual de Boana raniceps (Anura: Hylidae) en un área de Caatinga, noreste de Brasil
DOI:
https://doi.org/10.15446/caldasia.v46n1.99220Palabras clave:
Caatinga, Diet composition, Natural history, Reproductive biology, Sexual dimorphism (en)Biología reproductiva, Caatinga, Composición de la dieta, Dimorfismo sexual, Historia natural (es)
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The number of studies on the ecology of the genus Boana is vast in Brazilian biomes. Among the different species of this genus, B. raniceps is considered a common and widely distributed species. Despite this, only a few studies have explored the ecology of this species in the Caatinga biome. In this study we present information on the diet composition, reproduction, and sexual dimorphism of B. raniceps in the Caatinga biome, northeastern Brazil, providing additional information about the natural history of the species. We observed that B. raniceps has a generalist diet, consuming a great diversity of prey categories, but with a numerical and volumetric prevalence of Coleoptera. Interestingly, there was an ontogenetic and sexual variation in the diet, with the Relative Importance Index (RII) for each prey category differed between males, females, and juveniles. Females were found bearing mature eggs in both the rainy and dry seasons. The number of eggs carried by each female ranged from 153 to 3904. There was sexual dimorphism in body size, with females larger than males. However, size was not a limiting factor in fecundity. Here, we present new information on the natural history of B. raniceps and reinforce the need for further studies with widely distributed and known species. This is the first study to demonstrate ontogenetic and sexual variation in the diet of anurans of the genus Boana.
El número de estudios sobre la ecología del género Boana es enorme en todos los biomas brasileños. Sin embargo, los estudios sobre la dieta, la reproducción y el dimorfismo sexual de B. raniceps son escasos en el bioma de Caatinga. En este estudio presentamos información sobre la composición de la dieta, la reproducción y el dimorfismo sexual de B. raniceps en el bioma de Caatinga, noreste de Brasil, proporcionando información adicional sobre la historia natural de esta especie. Observamos que B. raniceps tiene una dieta generalista, que consume una gran diversidad de categorías de presas, pero con prevalencia numérica y volumétrica de Coleoptera. Curiosamente, hubo una variación ontogenética y sexual en la dieta, pues el Índice de Importancia Relativa (RII) para cada categoría difiere entre machos, hembras y juveniles. Se encontraron hembras con huevos maduros tanto en la estación lluviosa como en la seca. El número de huevos transportados por cada hembra osciló entre 153 y 3904. Hubo dimorfismo sexual en el tamaño, siendo las hembras más grandes que los machos. Sin embargo, el tamaño no fue un factor limitante de la fecundidad. Aquí, presentamos nueva información sobre la historia natural de B. raniceps y reforzamos la necesidad de realizar más estudios incluso con especies ampliamente distribuidas y conocidas. Este es el primer estudio que demuestra la variación ontogenética y sexual en la dieta de los anuros del género Boana.
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