Feeding habits and ecological role of the freshwater stingray Potamotrygon magdalenae (Duméril 1865) (Myliobatiformes: Potamotrygonidae), combining gut-content and stable isotope analysis. - Márquez-Velásquez, Viviana; Rosa, Ricardo S.; Galindo, Esteban; Navia, Andrés F. (Environmental Biology of Fishes, 2019)