Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea
Besnard, Lucien; Duchatelet, Laurent; Bird, Christopher S.et al.
2022 • In Deep-Sea Research. Part I, Oceanographic Research Papers, 182, p. 103708
[en] Deep-sea elasmobranchs are commonly reported as bycatch of deep-sea fisheries and their subsequent loss has been highlighted as a long-running concern to the ecosystem ecological functioning. To understand the possible consequences of their removal, information on basic ecological traits, such as diet and foraging strategies, is needed. Such aspects have been widely studied through stomach content analysis but the lack of long-term dietary information requires other tools to be used such as stable isotopes. This study examines nitrogen and carbon isotope compositions of the velvet belly lantern shark, Etmopterus spinax, one of the most impacted shark species in northeastern Atlantic fisheries as a result of accidental catches. E. spinax was sampled at four different locations, characterized by contrasting oceanographic and ecological conditions: the western Mediterranean Sea (near the Balearic Islands), the southern Iberian upwelling system, Rockall Trough and southwestern Norwegian fjords. Stomach content analysis revealed similar prey species among sites, with a diet dominated by Euphausiacea (mostly Meganyctiphanes norvegica) and an ontogenetic shift towards small teleost fishes, cephalopods or other crustaceans. Despite these similarities, muscle stable isotope compositions differed across sampled locations. Rather than clear dietary differences, the contrasted isotopic values are likely to reflect differences in environmental settings and biogeochemical processes affecting nutrient dynamics at the base of the food webs.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Duchatelet, Laurent ; University of Louvain - UCLouvain, Earth and Life Institute, Marine Biology Laboratory, Louvain-la-Neuve, Belgium
Bird, Christopher S.; Centre for Environment, Fisheries, & Aquaculture Sciences (CEFAS), Lowestoft, United Kingdom
Le Croizier, Gaël; UMR Géosciences Environnement Toulouse (GET), Observatoire Midi Pyrénées (OMP), Toulouse, France
Michel, Loïc ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Ecologie trophique et isotopique ; Univ Brest, Ifremer, CNRS, Unité Biologie et Ecologie des Ecosystèmes marins Profonds (BEEP), Plouzane, France
Pinte, Nicolas; University of Louvain - UCLouvain, Earth and Life Institute, Marine Biology Laboratory, Louvain-la-Neuve, Belgium
Lepoint, Gilles ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Ecologie trophique et isotopique
Schaal, Gauthier; Univ Brest, CNRS, IRD, Ifremer, LEMAR, Plouzane, France
Vieira, Rui P. ; Centre for Environment, Fisheries, & Aquaculture Sciences (CEFAS), Lowestoft, United Kingdom ; School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom
Gonçalves, Jorge M.S.; CCMAR - Centro de Ciências do Mar, Universidade do Algarve, Faro, Portugal
Martin, Ulrich; University of Louvain - UCLouvain, Earth and Life Institute, Marine Biology Laboratory, Louvain-la-Neuve, Belgium
Mallefet, Jérôme; University of Louvain - UCLouvain, Earth and Life Institute, Marine Biology Laboratory, Louvain-la-Neuve, Belgium
Language :
English
Title :
Diet consistency but large-scale isotopic variations in a deep-sea shark: The case of the velvet belly lantern shark, Etmopterus spinax, in the northeastern Atlantic region and Mediterranean Sea
Publication date :
April 2022
Journal title :
Deep-Sea Research. Part I, Oceanographic Research Papers
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE] ANR - Agence Nationale de la Recherche [FR] CCMAR - Centro de Ciências do Mar do Algarve [PT] FCT - Fundação para a Ciência e a Tecnologia [PT]
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