1. LITTORAL, Ifremer, Concarneau, France
2. PHYTOX, Ifremer, Nantes, France
3. Research Department, Meise Botanic Garden, Meise, Belgium
4. Department of Biology, ECOSPHERE, University of Antwerp, Wilrijk, Belgium
5. Université de Bretagne Occidentale, Institut Universitaire de Technologie, Quimper Cedex, France