Impact of recent lake eutrophication on microbial community changes as revealed by high resolution lipid biomarkers in Rotsee (Switzerland) |
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| Institution: | 1. Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Surface Waters – Research and Management, Seestrasse 79, CH-6047 Kastanienbaum, Switzerland;2. ETH Zurich, Institute for Biogeochemistry and Pollution Dynamics, Universitaetsstrasse 16, CH-8092 Zurich, Switzerland;3. ETH Zurich, Geological Institute, Sonneggstrasse 5, CH-8092 Zurich, Switzerland;4. University of Utrecht, Department of Physical Geography, Budapestlaan 4, NL-3584 CD Utrecht, Netherlands;1. Department of Environmental Sciences – Botany, University of Basel, Basel, Switzerland;2. Swiss Federal Institute of Aquatic Science and Technology (Eawag), Kastanienbaum, Switzerland;3. Swiss Federal Institute of Technology in Zürich (ETHZ), Zürich, Switzerland;1. Department of Quaternary Geology and Paleogeography, Adam Mickiewicz University, Dzi?gielowa 27, 61-680 Poznań, Poland;2. Department of Geology, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK;3. Department of Geomorphology and Quaternary Geology, University of Gdańsk, Ba?yńskiego 5, 80-952 Gdańsk, Poland;4. Department of Biogeography and Paleoecology, Adam Mickiewicz University, Dzi?gielowa 27, 61-680 Poznań, Poland;5. Chair of Petroleum Geology, Montanuniversität Leoben, Peter-Tunner-Strasse 5, 87100 Leoben, Austria;1. State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. Organic Geochemistry Unit, Bristol Biogeochemistry Research Centre, University of Bristol, Bristol BS8 1TS, UK;3. State Key Laboratory of Lake Sciences and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;4. Cabot Institute, University of Bristol, Bristol BS8 1TH, UK;1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, PR China;2. China University of Geosciences, Beijing, 100083, PR China;3. Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, USA;4. High National Magnetic Field Laboratory, Tallahassee, FL, USA;5. Institute of Hydrobiology, The Jinan University, Guangzhou, Guangdong Province, 510632, PR China;6. Hubei Earthquake Administration, Wuhan, Hubei Province, 430071, PR China |
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| Abstract: | The effects of eutrophication on short term changes in the microbial community were investigated using high resolution lipid biomarker and trace metal data for sediments from the eutrophic Lake Rotsee (Switzerland). The lake has been strongly influenced by sewage input since the 1850s and is an ideal site for studying an anthropogenically altered ecosystem. Historical remediation measures have had direct implications for productivity and microbial biota, leading to community composition changes and abundance shifts. The higher sewage and nutrient input resulted in a productivity increase, which led predominantly to a radiation in diatoms, primary producers and methanogens between about 1918 and 1921, but also affected all microorganism groups and macrophytes between about 1958 and 1972. Bacterial biomass increased in 1933, which may have been related to the construction of a mechanical sewage treatment plant. Biomarkers also allowed tracing of fossil organic matter/biodegraded oil contamination in the lake. Stephanodiscus parvus, Cyclotella radiosa and Asterionella formosa were the dominant sources of specific diatom biomarkers. Since the 1850s, the cell density of methanogenic Archaea (Methanosaeta spp.) ranged within ca. 0.5–1.8 × 109 cells g?1 dry sediment and the average lipid content of Rotsee Archaea was ca. 2.2 fg iGDGTs cell?1. An altered BIT index (BITCH), indicating changes in terrestrial organic matter supply to the lake, is proposed. |
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