ICIVET-LITORAL   24728
INSTITUTO DE CIENCIAS VETERINARIAS DEL LITORAL
Unidad Ejecutora - UE
artículos
Título:
Seasonal variation in the diet of Lontra longicaudis in the Paraná River basin, Argentina
Autor/es:
VEZZOSI, R.; EBERHARDT, A. T.; RAIMONDI, V.; GUTIERREZ, MF; PAUTASSO, A
Revista:
MAMMALIA
Editorial:
WALTER DE GRUYTER & CO
Referencias:
Lugar: Berlin; Año: 2014 vol. 78 p. 451 - 463
ISSN:
0025-1461
Resumen:
We studied the Neotropical otter (Lontra longicaudis) seasonal diet variations in the middle Paraná River valley, in central-northern Argentina, at the southern limit of its global range. We recorded 745 prey items in 320 scats collected over the course of one year in a tributary stream of the Paraná River. Fish, crustaceans, mammals and insects were the most important items in frequency of occurrence among items. Other items, like mollusks, birds, amphibians and reptilians were presented in low frequency in all seasons. We recorded seasonal variation in the frequency of the principal categories items: fish, mammals, crustaceans and insects and in reptilian that had low frecuency. Although fish were the most common items consumed by the otter, other groups such as crustaceans, mammals and insects, were also important in the diet of the Neotropical otter throughout the seasons. Mammals and insects showed a higher frequency in the Neotropical otter diet in our study than in Brazil, Mexico and even northern Argentina. We noted a marked variation throughout the Neotropical region in the niche breadth indices among studies of Neotropical otter?s diet. The Shannon H? diversity index showed a higher value in our study than in most of previous diet analyses of this species.