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Comparing long term sediment records to current biological quality element data - Implications for bioassessment and management of a eutrophic lake |
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| Authors: | Tommi Kauppila Antti Kanninen Matias ViitasaloJohanna Räsänen Kristian MeissnerJukka Mattila |
| Institution: | a Geological Survey of Finland, P.O. Box 1237, 70211 Kuopio, Finland b Centre for Economic Development, Transport and the Environment, P.O. Box 1199, 70211 Kuopio, Finland c University of Jyväskylä, P.O. Box 35, 40014 Jyväskylä University, Finland d Savo-Karjalan Ympäristötutkimus Oy, Yrittäjäntie 24, 70150 Kuopio, Finland e Finnish Environment Institute, Mechelininkatu 34a, P.O. Box 140, 00251 Helsinki, Finland f Finnish Environment Institute, Survontie 9, 40500 Jyväskylä, Finland g Kymijoen vesi ja ympäristö ry, Tapiontie 2C, 45160 Kouvola, Finland |
| Abstract: | Defining reference conditions for lakes situated in areas of human settlement and agriculture is rarely straightforward, and is especially difficult within easily eroding and nutrient rich watersheds. We used diatoms, cyanobaterial akinetes, remains of green algae and chironomid head capsules from sediment samples of Lake Kirmanjärvi, Finland, to assess its deviation from the initial ecological status. These site-specific records of change were compared to current type-specific ecological status assessment. All paleolimnological data indicated deviation from natural conditions and mirrored the current, monitoring-based assessment of “moderate” ecological lake status. However, the sediment data showed that the lake should be re-typified as a naturally eutrophic lake. Sediment records as well as current monitoring data indicated temporary improvement in water quality in response to extensive fish manipulation. Our results suggest that paleolimnological records can be used to derive site-specific reference conditions and that extensive restoration efforts can result in gradual, observable improvements of water quality and ecological status. |
| Keywords: | Water Framework Directive Sediment Chironomids Diatoms Cyanobacteria Green algae Ecological status assessment Management Restoration |
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