1. School of Earth and Environmental Sciences; College of Natural Sciences; Seoul National University; Seoul 151-747 Korea
2. Biological Institute; Section of Phycology; University of Copenhagen; Universitetsparken 4 DK-2100 Copenhagen K Denmark
3. KHNP-Central Research Institute; Korea Hydro & Nuclear Power Corporation; 1312-70 Yuseong daero Yuseong-gu Daejeon 305-343 Korea
4. Marine Resources Research Department; KORDI; Ansan P. O. Box 29 Gyeonggi-do 425-600 Korea