Anuran–prey selection might be mediated by traits, either by mismatches in predator and prey traits (preventing interactions) or by predator selection of prey traits (encouraging interactions). These effect traits could be summarized in two contrasting foraging strategies: “active” and “sit-and-wait” foragers. We evaluated whether anurans could be classified into groups of species sharing traits associated with their diet, and what is the relation between particular effect traits of anurans and their prey. We collected anurans and identified their stomach contents once during dry, minor, and major rain seasons in six dry forest sites in the Colombian Caribbean. For each of the 19 anuran species and 436 prey items, we registered six effect traits. We applied RLQ and fourth-corner methodologies to relate predator and prey traits through their interaction matrix. Predators were assigned to five groups according to their differences in locomotion, body shape, proportion of the jaw width, mode of tongue protrusion, and strata preferred. Regarding preys, species were assigned to four groups according to their gregariousness, body shape and hardness, defensive traits, and mobility. Body size of both, predators and prey, had a minor contribution in the group assignment. We found that predators using active search target lowmobility preys, whereas species using sit-and-wait strategy target highly nutritive prey that are difficult to manipulate. By linking amphibian diet with foraging strategies, we hope to contribute to the understanding of mechanisms behind anuran–prey food web patterns and to build more realistic models of functional response to changing environments.

中文翻译：

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哥伦比亚加勒比热带干旱森林无尾目捕食者-猎物相互作用：一种功能方法

Anuran - 猎物选择可能由特征介导，要么是捕食者和猎物特征的不匹配（防止相互作用），要么是捕食者对猎物特征的选择（鼓励相互作用）。这些影响特征可以概括为两种截然不同的觅食策略：“主动”和“坐等”觅食者。我们评估了 anurans 是否可以归类为共享与其饮食相关的特征的物种组，以及 anurans 的特定效应特征与其猎物之间的关系是什么。我们在哥伦比亚加勒比地区的六个干旱森林地点收集了无尾类，并在干旱、小雨和大雨季节确定了它们的胃内容物。对于 19 个 anuran 物种和 436 个猎物，我们记录了六个效应特征。我们应用 RLQ 和第四角方法通过它们的交互矩阵将捕食者和猎物特征联系起来。捕食者根据它们在运动、体型、下颌宽度比例、舌头伸出方式和偏好地层方面的差异被分为五组。关于猎物，根据它们的群居性、体型和硬度、防御特性和移动性，将物种分为四组。捕食者和猎物的体型在小组分配中的贡献很小。我们发现，使用主动搜索的捕食者瞄准移动性低的猎物，而使用坐等策略的物种则瞄准难以操纵的高营养猎物。通过将两栖动物饮食与觅食策略联系起来，