Deciphering the impact of land-uses on terrestrial organic matter and mercury inputs to large boreal lakes of central Québec using lignin biomarkers |
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| Institution: | 1. Postdoctoral Research Station of Ecology, Fujian Normal University, Fuzhou 350007, China;2. School of Environment and Resources, Fuzhou University, Fuzhou 350116, China;3. Key Laboratory of Humid Subtropical Eco-Geographical Process, Ministry of Education, Fujian Normal University, Fuzhou 350007, China;1. iES Landau, Institute for Environmental Sciences, University Koblenz-Landau, Fortstraße 7, 76829 Landau in der Pfalz, Germany;2. Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland;3. Department of Taxonomy and Ecology, Faculty of Biology and Geology, Babeș-Bolyai University, 5‐7 Clinicilor Str, 400006 Cluj‐Napoca, Romania;1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China;3. Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China;4. Departments of Chemistry and Biology, Carleton University, Ottawa K1S 5B6, Ontario, Canada |
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| Abstract: | To evaluate watershed impacts of anthropogenic activities on terrestrial organic matter (TOM) and total mercury (THg) dynamics in large boreal lake ecosystems, we studied sediment cores retrieved in eight large lakes of Québec (Canada). Two lakes with pristine watersheds were considered as reference lakes and six lakes with watersheds affected by different types of anthropogenic activities (e.g. logging and/or mining activities) were used to illustrate the influence of land-use on TOM and Hg cycling in lakes. A Geographical Information System (GIS) approach was used to correlate the evolution of anthropogenic land-uses from 1979 to 2010 (e.g. logging and mining activities) to TOM and THg contents measured in sediment cores. In each core, THg concentrations gradually increased over the recent years. Using lignin biomarkers, we noticed that the presence of both intense logging and mining activities in the watershed does not necessarily correspond to noticeable changes in the relative amount of terrestrial organic matter (TOM) exported from the watershed to the sediments and by extension to the level of THg measured in sediments. Apparently large-scale watersheds show some “buffering” capacity to land-use disturbance. |
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