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dc.coverage.spatialBogotá, Colombiaspa
dc.creatorEstupiñan Montaño, Colombo
dc.creatorCedeño Figueroa, Luis
dc.creatorEstupiñán Ortíz, José F.
dc.creatorGalván Magaña, Felipe
dc.creatorSandoval Londoño, Alejandro
dc.creatorCastañeda Suárez, David
dc.creatorPolo Silva, Carlos J.
dc.date.accessioned2020-04-13T15:12:11Z
dc.date.available2020-04-13T15:12:11Z
dc.date.created2018
dc.identifier.otherhttps://doi.org/10.1017/S0025315418000474spa
dc.identifier.urihttp://hdl.handle.net/20.500.12010/8731
dc.description.abstractAs 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 ,150 cm in total length consumed prey of coastal origin, whereas sharks ≥150 cm foraged in oceanic waters and near the continental shelf. The analyses indicate that S. zygaena is a specialized predator consuming mainly squids.spa
dc.format.extent8 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.publisherUniversidad de Bogotá Jorge Tadeo Lozanospa
dc.subjectDietspa
dc.subjectEcuadorspa
dc.subjectOntogenyspa
dc.subjectTop predatorspa
dc.subjectFood webspa
dc.subjectSeasonal variationsspa
dc.titleFeeding habits and trophic level of the smooth hammerhead shark, sphyrna zygaena (carcharhiniformes: sphyrnidae), off Ecuadorspa
dc.type.localArtículospa
dc.subject.lembTiburones -- Investigacionesspa
dc.subject.lembNutrición animal -- Investigacionesspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.type.hasversioninfo:eu-repo/semantics/acceptedVersioneng
dc.rights.localAbierto (Texto Completo)spa
dc.subject.keywordAnimal nutritionspa
dc.identifier.doihttps://doi.org/10.1017/S0025315418000474spa
dc.identifier.instnameinstname:Universidad de Bogotá Jorge Tadeo Lozanospa
dc.identifier.reponamereponame:Repositorio Institucional de la Universidad de Bogotá Jorge Tadeo Lozanospa


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