1. Roscoff Biological Station Place Georges Teissier Roscoff 29680 France
2. The Scottish Association for Marine Science Scottish Marine Institute Oban Argyll, PA37 1QA UK
3. Graduate School of Environmental Science Hokkaido University Sapporo 060‐0810 Japan
4. UMR 7245 Molécules de Communication et Adaptation des Micro‐organismes Muséum National d'Histoire Naturelle CP 54, 57 rue Cuvier Paris 75005 France
5. Department of Algal Development and Evolution Max Planck Institute for Developmental Biology Max‐Planck‐Ring 5 Tübingen 72076 Germany
6. Muroran Marine Station Field Science Center for Northern Biosphere Hokkaido University Muroran 051‐0013 Japan