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Rodríguez-Pérez, M.Y., D., Aurioles-Gamboa, L., Sánchez-Velasco, M.F., Lavín & S.D., Newsome (2018). Identifying critical habitat of the endangered vaquita (Phocoena sinus) with regional d13C and d15N isoscapes of the Upper Gulf of California, Mexico. Marine Mammal Science. 34(3): 790-805. DOI: 10.1111/mms.12483.

Identifying critical habitat of the endangered vaquita (Phocoena sinus) with regional d13C and d15N isoscapes of the Upper Gulf of California, Mexico

Mónica Y. Rodríguez-Pérez, David Aurioles-Gamboa 1, Laura Sánchez-Velasco 1, Miguel F. Lavín y Sed D. Newsome

1 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas
The vaquita (Phocoena sinus) is the world's most endangered cetacean and has experienced a 60% reduction in the size of its population in the past decade. Knowledge of its basic ecology is essential for developing successful management plans to protect and conserve this species. In this study, we identified vaquita foraging areas by creating an isoscape of the Upper Gulf of California (UGC) based on sediment and zooplankton carbon (d13C) and nitrogen (d15N) isotope values. Our results confirm that this species is confined to the western region of the UGC, which is characterized by relatively high d15N values (sediments: 10.2‰?±?2.0‰, zooplankton: 15.8‰?±?1.3‰), higher sea surface temperatures (~16°C–25°C), higher concentrations of silt in sediments, and the highest turbidity. In contrast, the eastern region of the UGC had relatively low sediment (7.7‰?±?2.4‰) and zooplankton (14.6‰?±?1.0‰) d15N values, and the highest concentrations of sand in sediments. Our approach is an effective use of marine isoscapes over a small spatial scale (

Palabras clave: Marine mammals; stable isotopes; porpoises; marine isoscapes; Vaquita; Phocoena sinus

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