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Resumen del producto
Estupiñán-Montaño, C., L., Cedeño Figueroa, J.F., Estupiñán-Ortiz, F., Galván-Magaña, A., Sandoval-Londoño, D., Castañeda-Suárez & C.J., Polo-Silva
(2019).
Feeding habits and trophic level of the smooth hammerhead shark, Sphyrna zygaena (Carcharhiniformes: Sphyrnidae), off Ecuador.
Journal of the Marine Biological Association of the United Kingdom.
99(3): 673-680.
DOI: 10.1017/S0025315418000474.
Feeding habits and trophic level of the smooth hammerhead shark, Sphyrna zygaena (Carcharhiniformes: Sphyrnidae), off Ecuador
Colombo Estupiñán-Montaño, Luis Cedeño Figueroa, Jose F. Estupiñán-Ortiz, Felipe Galván-Magaña, Alejandro Sandoval-Londoño, David Castañeda-Suárez y Carlos J. Polo-Silva
As apex predators, sharks are known to play an important role in marine food webs. Detailed information on their diet and trophic level is however needed to make clear inferences about their role in the ecosystem. A total of 335 stomachs of smooth hammerhead sharks, Sphyrna zygaena, were obtained from commercial fishing vessels operating in the Ecuadorian Pacific between January and December 2004. A total of 53 prey items were found in the stomachs. According to the Index of Relative Importance (%IRI), cephalopods were the main prey (Dosidicus gigas, Sthenoteuthis oualaniensis, Ancistrocheirus lesueurii and Lolliguncula (Loliolopsis) diomedeae). Sphyrna zygaena was thus confirmed to be a teutophagous species. The estimated trophic level of S. zygaena was between 4.6 and 5.1 (mean ± SD: 4.7 ± 0.16; males: 4.7; females: 4.8). Levin's index (BA) was low (overall: 0.07; males: 0.08; females: 0.09), indicating a narrow trophic niche. We found that sharks
Palabras clave: diet; Ecuador; ontogeny; Top predator; Food web; seasonal variations
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