1. Center for Permafrost, Dep. of Geosciences and Natural Resource Management; Univ. of Copenhagen; Øster Voldgade 10, DK-1350 Copenhagen K Denmark
2. Marine Biological Section, Dep. of Biology; Univ. of Copenhagen; Strandpromenaden 5, DK-3000 Helsingør Denmark
3. Scottish Association for Marine Science, Dunstaffnage Marine Lab.; Oban Argyll, PA37 1QA UK
4. Dep. of Biology and Nordic Center for Earth Evolution; Univ. of Southern Denmark; Odense M Denmark
5. Greenland Climate Research Centre; Kivioq 2, Box 570 3900 Nuuk Greenland