Diet is a fundamental aspect of the ecological niche of amphibians and usually varies intra-specifically in response to extrinsic environmental and intrinsic individual factors. Phenotypic variations among individuals can generate intrapopulation differences in trophic resource use, which could have important ecological and evolutionary implications in amphibian populations. Here, we studied the intrapopulation dietary variation of the frog Pseudopaludicola pusilla in an anthropic savanna of the Colombian Caribbean region, considering the effects of seasonality and sex on the size, amount, prey composition and dietary individual specialization. We collected 44 adult frogs during the dry season and 46 during the rainy season and analyzed their stomach contents to determine their dietary composition. Our results indicate that P. pusilla is a generalist and opportunist predator, feeding mainly on insects of the orders Orthoptera, Coleoptera and Hymenoptera, which were the most important prey categories due to their numeric, volumetric and frequency contributions. We observed seasonal variations regarding volumetric prey composition and the importance value of each prey category in the populational diet. Individuals of P. pusilla consume more prey items during the rainy season and bigger prey during the dry season, but the volume of stomach contents did not vary seasonally. Males and females of P. pusilla consumed a similar number of prey items, but females ingested more voluminous prey and had greater volumes of stomach contents than males. Additionally, we observed a pattern of dietary individual specialization, which was not related to morphological trade-offs and did not differ among seasons. These findings contribute to the understanding of the seasonal dynamics of the use of trophic resources by anurans and the effect of sex on dietary characteristics of P. pusilla, in environments strongly influenced by climatic seasonality.

饮食是两栖动物生态位的一个基本方面，通常会因外部环境和内在个体因素而发生特异性内变化。个体之间的表型差异会在营养资源利用方面产生种群内差异，这可能对两栖动物种群产生重要的生态和进化影响。在这里，我们研究了青蛙Pseudopaludicola pusilla的种群内饮食变化在哥伦比亚加勒比地区的人类稀树草原，考虑季节性和性别对大小、数量、猎物组成和饮食个体专业化的影响。我们在旱季收集了 44 只成年青蛙，在雨季收集了 46 只，并分析了它们的胃内容物以确定它们的饮食成分。我们的结果表明P. pusilla是一种多面手和机会主义的捕食者，主要以直翅目、鞘翅目和膜翅目昆虫为食，这些昆虫因其数量、体积和频率贡献而成为最重要的猎物类别。我们观察到有关体积猎物组成和种群饮食中每个猎物类别的重要性值的季节性变化。P. pusilla个体雨季消耗较多的猎物，旱季消耗较大的猎物，但胃内容物的体积没有季节性变化。P. pusilla 的雄性和雌性消耗了相似数量的猎物，但雌性比雄性摄入了更多体积的猎物，胃内容物也更大。此外，我们观察到饮食个体专业化的模式，这与形态权衡无关，并且在季节之间没有差异。这些发现有助于了解在受气候季节性强烈影响的环境中，无尾类利用营养资源的季节性动态以及性别对P. pusilla饮食特征的影响。