Reference : Marine mammals from the North Sea: Approach of their feeding ecology through stable i...
Scientific congresses and symposiums : Poster
Life sciences : Environmental sciences & ecology
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/65892
Marine mammals from the North Sea: Approach of their feeding ecology through stable isotope and cadmium measurements
English
Das, Krishna mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Debacker, Virginie mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Ecologie animale et écotoxicologie - Ecophysiologie et physiologie animale >]
Bouquegneau, Jean-Marie mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
2000
No
No
National
Réunion des Océanographes français: Zones Littorales et Anthropisation: Gestion et nuisances
4-6 juillet 2000
La Rochelle
France
[en] marine mammals ; cadmium ; stable isotopes
[en] The fertile waters of the North Sea represent one major life site for at least three different marine mammal species: the harbour porpoise, Phocoena phocoena , the harbour seal, Phoca vitulina, and the white-beaked dolphin, Lagenorhynchus albirostris. More occasionally, oceanic species such as the white-sided dolphin Lagenorhynchus acutus, the sperm whale Physeter macrocephalus or the fin whale Balaenoptera physalus can be sighted or found stranded. Very few data dealing with marine mammal diet in the North Sea are available. In order to contribute to the feeding ecology of these North Sea marine mammals, Cd as well as 15N and 13C measurements have been performed in their tissues.
Sperm whales and white-sided dolphins display high renal Cd levels (258 µg.g-1 and 88 µg.g-1 dry weight respectively). Mean Cd concentrations measured in harbour porpoise, harbour seal, white beaked dolphin and fin whale kidneys remain low (mean: 5, 0.9, 0.5 and 4 µg.g-1 respectively). However, some adult porpoises display renal Cd concentrations higher than 10 µg.g-1. Mean 13C measured in the muscles of sperm whales, fin whales and white-sided dolphins are more negative compared to harbour porpoise, harbour seal or white-beaked dolphin mean value. Cd contaminated porpoises display significant lower muscle 13C than other porpoises.
Both low d13C and high Cd levels suggest a greater reliance of white-sided dolphins, sperm whales on oceanic cephalopods. It appears that some harbour porpoises can also feed on oceanic squids suggesting dynamic interactions between the North Sea and the North Atlantic porpoise populations.
Centre Interfacultaire de Recherches en Océanologie - MARE
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/65892

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