Stefan Löfgren,^* Maria Kahlert,^** Mats Johansson,^*** Jakob Bergengren<sup>****


*</sup>Stefan Löfgren is associate professor at the Department of Aquatic Sciences and Assessment, SLU Uppsala. His research focuses on acidification and eutrophication of surface waters connected to forestry and agriculture. His address: Department of Aquatic Sciences and Assessment, SLU, P.O. Box 7050, S-750 07 Uppsala, Sweden. stefan.lofgren@vatten.slu.se
^**Maria Kahlert is senior researcher at the Department of Aquatic Sciences and Assessment, SLU Uppsala. Her research is directed toward freshwater benthic algae with focus on diatoms. She is involved in the development of diatom indexes for the water quality monitoring of streams and lakes, and works also on the role of benthic algae in freshwater ecosystems. Her address: Department of Aquatic Sciences and Assessment, SLU, P.O. Box 7050, S-750 07 Uppsala, Sweden. maria.kahlert@vatten.slu.se
^***Mats Johansson is administrative official at the Environmental Assessment Unit of the Västerbotten County Administrative Board. He works with the regional implementation of the Water Framework Directive and has a background as a researcher in riparian plant ecology at the Department of Ecology and Environmental Science, Umeå University. His address: Västerbotten County Administrative Board, SE-901 86 Umeå, Sweden. mats.e.johansson@lansstyrelsen.se
^****Jakob Bergengren is administrative official at the Environmental Assessment Unit of the Jönköping County Administrative Board. He works with the regional implementation of the Water Framework Directive. His address: Jönköping County Administrative Board, SE-551 86 Jönköping, Sweden. jakob.bergengren@lansstyrelsen.se