BACKGROUND Stomach contents of 131 specimens of five elasmobranch species (Mustelus lunulatus, Dasyatis longa, Rhinobatos leucorhynchus, Raja velezi and Zapteryx xyster) caught in the central fishing zone in the Pacific Ocean of Colombia were counted and weighed to describe feeding habits and dietary overlaps. RESULTS Twenty-one prey items belonging to four major groups (stomatopods, decapods, mollusks and fish) were identified. Decapod crustaceans were the most abundant prey found in stomachs. The mantis shrimp Squilla panamensis was the main prey item in the diet of M. lunulatus; tiger shrimp Trachypenaeus sp. was the main prey item in the diet of Rhinobatos leucorhynchus and Raja velezi, and Penaeidae shrimp were the main prey items in the diet of Z. xyster. Furthermore, fish were important in the diet of Raja velezi, Z. xyster and D. longa. The greatest diet breadth corresponded to Z. xyster whereas M. lunulatus was the most specialized predator. Finally, four significant diet overlaps between the five species were found, attributable mainly to Squillidae, Penaeidae and Fish. CONCLUSION Shrimps (Penaeidae and stomatopods) and benthic fishes were the most important food types in the diet of the elasmobranch species studied. Diet breadth and overlap were relatively low. Determination of food resource partitioning among the batoid species studied was not possible. However, we identified partitions in other niche axes (time of feeding activity and habitat utilization). It is possible to assume that diffuse competition could be exceeding the biunivocal competition among the studied species. Therefore, this assemblage would have a strong tendency to trophic guild formation.

中文翻译：

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哥伦比亚东部热带太平洋沿海水域中的弹性bra鱼类的摄食生态。

背景技术对哥伦比亚太平洋中部捕捞的五种弹性分支物种（Mustelus lunulatus，Dasyatis longa，Rhinobatos leucorhynchus，Raja velezi和Zapteryx xyster）的131个标本的胃中含量进行计数并称重，以描述摄食习惯和饮食重叠。结果确定了二十四个属于四大类（食脚类动物，十足动物，软体动物和鱼类）的猎物。十足纲甲壳动物是在胃中发现的最丰富的猎物。螳螂虾Squale panamensis是蓝藻饮食中的主要猎物。虎虾Trachypenaeus sp。是白犀牛和Raja velezi饮食中的主要猎物，斑节对虾是Z. xyster饮食中的主要猎物。此外，鱼在Raja velezi，Z。xyster和D. longa的饮食中很重要。最大的饮食宽度对应于木僵菌（Z. xyster），而鲁氏支原体是最专业的捕食者。最后，在五个物种之间发现了四个显着的饮食重叠，主要归因于鳞科，对虾科和鱼类。结论虾（Penaeidae和气孔足类）和底栖鱼类是所研究的弹性bra物种饮食中最重要的食物类型。饮食广度和重叠率相对较低。无法确定所研究的蝙蝠种类之间的食物资源分配。但是，我们确定了其他利基轴的分区（觅食活动时间和栖息地利用时间）。可以假设，扩散竞争可能会超过所研究物种之间的单声道竞争。因此，该组合将具有形成营养性行会的强烈趋势。