We investigated trophic resource partitioning in seven syntopic anurans from low- and mid-elevation stream habitats of a tropical riparian ecosystem by utilising stomach content analysis (SCA) and stable isotope analysis (SIA). Our SCA data revealed dietary similarities, narrow trophic niche breadth, and low dietary niche overlap in Ansonia muelleri, Limnonectes magnus, Occidozyga laevis, Megophrys stejnegeri, Pulchrana grandocula, Sanguirana mearnsi, and Staurois natator which could be attributed to these anurans’ selection of available local prey items. We confirmed ant-specialisation (myrmecophagy) of the Mindanao island endemic bufonid A. muelleri based on our temporal SCA dietary data. Our SIA estimates of assimilation of potential prey sources confirmed that L. magnus, P. grandocula, and O. laevis are generalist predators, opportunistically feeding on locally abundant insect prey items. This study on trophic resource partitioning in syntopic anurans provides the first picture of trophic interactions, i.e., predation and competition in stream communities in tropical riparian zones of a watershed ecosystem in northeast Mindanao of the southern Philippines.

中文翻译：

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热带溪流群落同位无尾目的营养生态学

我们利用胃含量分析 (SCA) 和稳定同位素分析 (SIA) 研究了热带河岸生态系统的低海拔和中海拔河流栖息地的七个同位无尾目动物的营养资源分配。我们的 SCA 数据揭示了在Ansonia muelleri、Limnonectes magnus、Occidozyga laevis、Megophrys stejnegeri、Pulchrana grandocula、Sanguirana mearnsi， 和Staurois 游泳者这可以归因于这些 anurans 选择可用的当地猎物。我们确认了棉兰老岛地方性蟾蜍的蚂蚁特化 (myrmecophagy)A. muelleri基于我们的时间 SCA 饮食数据。我们对潜在猎物来源同化的 SIA 估计证实，L. magnus,P. grandocula， 和O. laevis是多面手的捕食者，机会主义地以当地丰富的昆虫猎物为食。这项关于同位无尾动物营养资源分配的研究提供了第一张关于营养相互作用的图景，即菲律宾南部棉兰老岛东北部流域生态系统热带河岸带河流群落的捕食和竞争。