1. Jordforsk, Frederik A. Dahls vei 20 NO-1432 Ås Norway
2. Linköping University; IFM/Biology; SE-581 83 Linköping Sweden
3. Ekologgruppen i Landskrona AB; Järnvägsgatan 19B SE-261 32 Landskrona Sweden
4. Telemark University College; Box 203 NO-3901 Porsgrunn Norway
5. Division of Water Quality Management; Swedish University of Agricultural Sciences; Box 7072 SE-750 07 Uppsala Sweden
6. Finnish Environment Institute; Integrated River Basin Research; P.O. Box 140 FIN-00251 Helsinki Finland