1. Department of Molecular Biology, University of Bergen, P.O.Box 7802, N-5020 Bergen, Norway, Biosense Laboratories AS, Thormøhlensgate 55, N-5008 Bergen, Norway, Norwegian Institute for Water Research (NIVA), Gaustadalleen 21, N-0349 Oslo, Norway, Department of Plant and Environmental Sciences, University of Life Sciences, Post Box 5003, N-1432 Ås, Norway, Norwegian School of Veterinary Science, PO Box 8146 Dep, N-0033 Oslo, Norway, University of Applied Sciences Northwestern Switzerland, Gründenstrasse...