Fundación colombiana para la investigación y conservación de tiburones y rayas, SQUALUS. Carrera 79 No. 6-37, Cali, Colombia.
J Fish Biol. 2011 Apr;78(4):1213-24. doi: 10.1111/j.1095-8649.2011.02931.x. Epub 2011 Mar 15.
The food habits and trophic ecology of Urotrygon rogersi were analysed to ascertain sexual, ontogenetic, temporal and spatial effects on the diet. These effects were examined with contingency tables, simple correspondence analysis and MANOVA. The trophic relationships of the species were determined with Levin's niche amplitude index and Pianka's diet overlap index. Urotrygon rogersi is a predator of benthic organisms, especially shrimp and polychaetes. Analysis of sex and time showed no significant differences, but differences among class sizes were found. A strong trend towards diet specialization and a strong overlap between sexes and between class sizes were found. Finally, fishing activity on shrimps in the study area could force U. rogersi to change its trophic spectrum over time as an adaptation to the considerable reduction in its principal prey.
对罗氏沼虾的饮食习惯和营养生态进行了分析，以确定性别、个体发育、时间和空间对其饮食的影响。这些影响通过列联表、简单对应分析和 MANOVA 进行了检验。物种的营养关系通过莱文的生态位幅度指数和 Pianka 的饮食重叠指数来确定。罗氏沼虾是底栖生物的捕食者，特别是虾和多毛类。对性别和时间的分析表明没有显著差异，但在类群大小上存在差异。发现饮食专门化的趋势很强，性别之间和类群大小之间的重叠也很强。最后，研究区域对虾类的捕捞活动可能会迫使罗氏沼虾随着其主要猎物的大量减少而改变其营养谱，以适应这种变化。
