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Título

Unravelling the ecological role and trophic relationships of uncommon and threatened elasmobranchs in the western Mediterranean Sea

AutorBarría, Claudio ; Coll, Marta ; Navarro, Joan
Palabras claveMediterranean Sea
Rays
Sharks
Skates
Species at risk
Stable isotopes
Trophic ecology
Trophic level
Fecha de publicación12-nov-2015
EditorInter Research
CitaciónMarine Ecology Progress Series 539: 225-240 (2015)
ResumenDeficiencies in basic ecological information on uncommon and endangered elasmobranch fishes impair the assessment of their ecological role in marine ecosystems. In this study, we examined the feeding ecology (diet composition and trophic level) and trophic relationships of 22 elasmo branchs (2 Carcharhiniformes, 1 Hexanchiformes, 1 Lamniformes, 3 Myliobatiformes, 6 Rajiformes, 6 Squaliformes and 3 Torpediniformes) present in the western Mediterranean Sea. To obtain a comprehensive view of the feeding ecology of these species, we combined different approaches: stable isotope analyses (δC and δN values), stomach content analyses and published sources. Our results revealed differences in feeding strategies among elasmobranch groups: skates (Rajiformes) mainly consume crustaceans; sharks (Carcharhiniformes, Hexanchiformes, Squaliformes and Lamniformes) prefer mixed diets composed of cephalopods, crustaceans and fishes; electric rays (Torpediniformes) feed mostly on fishes; and the diet of stingrays (Myliobatiformes) varies between species. Sharks and electric rays show higher trophic positions than skates, and the former occupy similar positions to other apex predators. Skates are more similar to other mesopredator fishes. These new findings offer essential information on the ecological role of several elasmobranchs in the western Mediterranean Sea and provide useful data for managers for future conservation strategies
Descripción16 pages, 7 figures, 4 tables, supplementary material http://dx.doi.org/10.3354/meps11494
Versión del editorhttp://dx.doi.org/10.3354/meps11494
URIhttp://hdl.handle.net/10261/131498
DOI10.3354/meps11494
Identificadoresdoi: 10.3354/meps11494
issn: 0171-8630
e-issn: 1616-1599
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