CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
artículos
Título:
Feeding ecology of dusky dolphins Lagenorhynchus obscurus: evidence from stable isotopes
Autor/es:
LOIZAGA DE CASTRO; GARCÍA NÉSTOR ANÍBAL; SAPORITI FABIANA; CARDONA LUIS; VALES DAMIÁN GUILLERMO; CRESPO ENRIQUE ALBERTO
Revista:
JOURNAL OF MAMMALOGY
Editorial:
ALLIANCE COMMUNICATIONS GROUP DIVISION ALLEN PRESS
Referencias:
Lugar: Lawrence; Año: 2016 vol. 97 p. 310 - 320
ISSN:
0022-2372
Resumen:
The dusky dolphin Lagenorhynchus obscurus occurs in the Southern Hemisphere, where it is restricted to coastaltemperate areas. This study aimed to characterize the feeding ecology of dusky dolphins inhabiting northernand central Patagonia by using δ13C and δ15N stable isotope ratios in skin samples. We searched for evidenceof geographical and seasonal variation in diet and we explored dietary differences between sexes. Significantdifferences in the stable isotope ratios of dusky dolphins were found among the 4 gulfs under study. Skin samplesfrom Golfo San Matías and Golfo San Jorge were 13C-enriched and 15N-depleted compared to those from GolfoNuevo and Golfo San José. There was no seasonality in the diet at Golfo Nuevo, and no differences in the dietbetween sexes in any gulf. Furthermore, Bayesian ellipses of males and females were similar in size and theoverlap was mostly symmetrical in Golfo San José and Golfo San Jorge, while in the Golfo San Matías and GolfoNuevo, females had wider ranges of δ15N, suggesting the exploitation of a wider trophic niche. Finally, pelagicfishes and demersal pelagic squids were identified as the main prey for this species of dolphin, although theproportion of each prey varied regionally