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Resumen del producto
Páez-Rosas, D., M., Riofrío-Lazo & D., Aurioles-Gamboa
(2014).
Flexibility in the foraging strategies of the Galapagos sea lion inferred from a multiple approach analysis.
J., Denkinger & L., Vinueza (Eds.),
Springer International Publishing (Ed.), Social and Ecological Interactions in the Galapagos Islands. The Galapagos Marine Reserve. A Dynamic Social-Ecological System.
Cap. 3, pp.71-80.
Flexibility in the foraging strategies of the Galapagos sea lion inferred from a multiple approach analysis
Diego Páez-Rosas, Marjorie Riofrío-Lazo y David Aurioles-Gamboa
Studies concerning the foraging behavior of the endangered Galapagos sea lion (Zalophus wollebaeki) are essential to understand long-term conservation challenges and predict population fluctuations. This study provides a comparative analysis of variables related to the foraging habits and trophic niche flexibility of Z. wollebaeki. Complementary stable isotopes and remote sensors were used to measure space-time variables concerning Z. wollebaeki foraging habits among populations in the Galapagos Archipelago. In spatial terms, isotopic values (n ¼ 321) showed differences regarding foraging grounds (?13C: p ¼ 0.015). These results also show test subjects maintained equilibrium in the trophic level of their diet (?15N: p ¼ 0.152). The results of this study confirm the evolutionary behavior of Z. wollebaeki has resulted in a high level of flexibility in foraging habits. This adaptability affords a higher advantage for survival in the Galapagos: a confined ecosystem with limited resources.
Palabras clave: sea lion; Galápagos
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