caa a22 4500 44589184X CHVBK 20180317145619.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10750-010-0415-4 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0415-4 Climate-related challenges in long-term management of Säkylän Pyhäjärvi (SW Finland) [Elektronische Daten] [Anne-Mari Ventelä, Teija Kirkkala, Amaury Lendasse, Marjo Tarvainen, Harri Helminen, Jouko Sarvala] Säkylän Pyhäjärvi (SW Finland) is an example of a large and shallow lake suffering from eutrophication. During the last 20years, the quality and general usability of water in Pyhäjärvi have shown considerable variation driven by both a variety of human activities and climate-related factors such as wet and dry years. The lake has been thoroughly studied for decades and has been the object of comprehensive restoration activities both in the catchment and in the lake since the 1990s. Large variety of water protection measures like wetlands, sedimentation ponds and filtering systems have been implemented in the catchment area to reduce external nutrient load. Another important tool for Pyhäjärvi restoration is biomanipulation, done by local commercial fishermen in winter. Twenty-five percent of the annual phosphorus input is removed with fish catch. Currently, restoration work is facing new challenges: short or even nearly missing ice cover period and increased winter time nutrient load from the catchment. In the 2000s, there were 3years with exceptionally short ice period, allowing only brief winter seining periods. Consequently, the biomanipulation catch was very low in 2007 and 2008 leading to observable food web effects. Phosphorus load was especially high in winters 2006/2007 and 2008/2009. On the basis of the data of 1987-2008, we have tested the hypothesis if climate-related winter time variables like phosphorus load, air temperature and precipitation would affect the water quality of the lake in following summer, here measured as chlorophyll a concentration in the lake water. A linear model has been used and a validation procedure has been performed to select the best variables. Our results indicate some of the linkages between climate-related catchment processes and the ecological status of the lake. Springer Science+Business Media B.V., 2010 Eutrophication nationallicence Lake management nationallicence Climatic effects nationallicence Length of ice cover nationallicence Biomanipulation nationallicence External nutrient load nationallicence Ventelä Anne-Mari Pyhäjärvi Institute, Sepäntie 7, Ruukinpuisto, 27500, Kauttua, Finland aut Kirkkala Teija Pyhäjärvi Institute, Sepäntie 7, Ruukinpuisto, 27500, Kauttua, Finland aut Lendasse Amaury Department of Information and Computer Science, 00076, Aalto University School of Science and Technology, Finland aut Tarvainen Marjo Pyhäjärvi Institute, Sepäntie 7, Ruukinpuisto, 27500, Kauttua, Finland aut Helminen Harri Centre for Economic Development, Transport and the Environment for Southwestern Finland, 20810, Turku, Finland aut Sarvala Jouko Department of Biology, 20014, University of Turku, Finland aut Hydrobiologia Springer Netherlands 660/1(2011-02-01), 49-58 0018-8158 660:1<49 2011 660 10750 https://doi.org/10.1007/s10750-010-0415-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0415-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ventelä Anne-Mari Pyhäjärvi Institute, Sepäntie 7, Ruukinpuisto, 27500, Kauttua, Finland aut NATIONALLICENCE 700 1- Kirkkala Teija Pyhäjärvi Institute, Sepäntie 7, Ruukinpuisto, 27500, Kauttua, Finland aut NATIONALLICENCE 700 1- Lendasse Amaury Department of Information and Computer Science, 00076, Aalto University School of Science and Technology, Finland aut NATIONALLICENCE 700 1- Tarvainen Marjo Pyhäjärvi Institute, Sepäntie 7, Ruukinpuisto, 27500, Kauttua, Finland aut NATIONALLICENCE 700 1- Helminen Harri Centre for Economic Development, Transport and the Environment for Southwestern Finland, 20810, Turku, Finland aut NATIONALLICENCE 700 1- Sarvala Jouko Department of Biology, 20014, University of Turku, Finland aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 660/1(2011-02-01), 49-58 0018-8158 660:1<49 2011 660 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer