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

Lucien Besnard, Laurent Duchatelet, Christopher Bird, Gaël Le Croizier, Loïc Michel, Nicolas Pinte, Gilles Lepoint, Gauthier Schaal, Rui P. Vieira, Jorge M.S. Gonçalves, Ulrich Martin, Jérôme Mallefet