1. UPMC Univ Paris 06, UMR7232, BIOM, Observatoire Océanologique, F-66650, Banyuls-sur-Mer, France
2. CNRS, UMR7232, Observatoire océanologique, Banyuls-sur-Mer, France
3. Present address: INRA, UMR1319 Micalis, Jouy-en-Josas, France
4. Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
5. Institut de Biologie Moléculaire des Plantes, UPR2357 CNRS, associated with the University of Strasbourg, France
6. School of Life Sciences, Sussex University, Falmer, United Kingdom