Article (Scientific journals)
Feeding ecology of five commercial shark species of the Celtic Sea through stable isotope and trace metal analysis
Domi, Nadège; Bouquegneau, Jean-Marie; Das, Krishna
2005In Marine Environmental Research, 60 (5)
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Keywords :
elasmobranchs; stable isotopes; trace metals; trophic level; Celtic Sea; Galeorhinus galeus; Galeus melastomus; Mustelus asterias; Squalus acanthias; Scyliorhinus canicula
Abstract :
[en] In order to trace their feeding habits, stable carbon and nitrogen isotope ratios (delta(15)N and delta(13)C), as well as trace metal concentrations (Zn, Cd, Fe, Cu, Se and Hg) were analysed in the tissues of five commercial shark species from the Celtic Sea: the tope shark Galeorhinus galeus, the black-mouthed catshark Galeus melastomus, the starry smooth hound Mustelus asterias, the spiny dogfish Squalus acanthias and the lesser-spotted dogfish Scyliorhinus canicula. Our results were compared to previously described stomach contents and isotopic composition of potential preys. Isotopic ratio delta(15)N suggested that tope sharks fed at a higher trophic level (16.7 parts per thousand in the muscle) than the other species, reflecting its piscivorous diet. The lower values of spiny dogfish (11.6 parts per thousand in the muscle) might be explained, amongst other things, by either its migratory behaviour or its preference for preys from lower trophic levels. Cd and Hg were correlated with isotopic ratios delta(13)C and delta(15)N, and were shown to be diet-related whereas Zn, Fe and Cu seemed much more linked to species-specific metabolism. Although this multidisciplinary approach is revealed as a useful tool for the study of shark ecology, the lack of known trophic fractionation suggests that isotopic data be compared to traditional diet analyses. (c) 2005 Elsevier Ltd. All rights reserved.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Domi, Nadège;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Bouquegneau, Jean-Marie ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie - Doyen de la Faculté des Sciences
Das, Krishna  ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Océanologie
Language :
English
Title :
Feeding ecology of five commercial shark species of the Celtic Sea through stable isotope and trace metal analysis
Publication date :
December 2005
Journal title :
Marine Environmental Research
ISSN :
0141-1136
Publisher :
Elsevier Sci Ltd, Oxford, United Kingdom
Volume :
60
Issue :
5
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 08 September 2008

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