Water level regulation in winter triggers fouling of fishing nets by the diatom Aulacoseira islandica in a boreal lake

1) Finnish Environment Institute (SYKE), P.O. Box 140, FI-00251 Helsinki, Finland 2) University of Jyvaskyla, Department of Biological and Environmental Science, P.O. Box 35, FI-40014 University of Jyvaskyla, Finland 3) Finnish Environment Institute (SYKE), Jyvaskyla Office, P.O. Box 35, FI-40500 Jyvaskyla, Finland 4) Pirkanmaa Centre for Economic Development, Transport and the Environment, Yliopistonkatu 38, FI-33100 Tampere, Finland