1. National Institute of Aquatic Resources, Technical University of Denmark, Kemitorvet 1, Building 202, DK-2800 Kgs. Lyngby, Denmark
2. Department: Plankton, Institute of Marine Research, P.O. Box 1870, N-5817 Nordnes, Bergen, Norway
3. Deparment Zoological Museum, The Natural History Museum of Denmark, Gothersgade 130, 1123 København K, Denmark