Ecological assessment of the Selenga River basin,the main tributary of Lake Baikal,using aquatic macroinvertebrate communities as bioindicators |
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| Affiliation: | 1. Faculty of Geography, Lomonosov Moscow State University, GSP-1, 1 Leninskiye Gory, Moscow 119991 Russia;2. Novosibirsk State University, Pirogova 2, Novosibirsk 630090 Russia;3. Faculty of Biology, Lomonosov Moscow State University, 1-12 Leninskie Gory, Moscow 119991, Russia;4. Department of Agriculture and Fisheries, Bribie Island Research Centre, 4507 Woorim, Queensland, Australia;1. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China;2. Ministry of Education Key Laboratory of Water and Sediment Science, School of Environment, Beijing Normal University, Beijing 100875, China;3. Renewable Energy School, North China Electric Power University, Beijing 102206, China;1. Laboratory of Environmental Toxicology and Aquatic Ecology, Ghent University, Coupure Links 653, B-9000, Gent, Belgium;2. Provincial Center of Environmental Research, Godshuizenlaan 95, 9000, Gent, Belgium;3. Limnology Unit, Department of Biology, Ghent University, K.L. Ledeganckstraat 35, 9000 Gent, Belgium;1. Benthic Ecology Unit, Department of Marine Sciences, University of Lagos, Nigeria;2. Department of Biological Oceanography, Nigerian Institute for Oceanography and Marine Research, Lagos, Nigeria;1. Water Research Group, Unit for Environmental Sciences and Management, North-West University, 11 Hoffman St, Potchefstroom 2520, South Africa;2. Department of Aquatic Ecology and Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstr. 5, Essen 45141, Germany;1. Illinois Natural History Survey, University of Illinois, USA;2. Nanjing Agricultural University, China;3. International Joint Commission, Great Lakes Regional Office, MI, USA;4. Department of Environmental Science and Management, Portland State University, OR, USA;5. Shanghai Normal University, China;6. Jiuzhaigou Reserve Administrative Bureau, Sichuan, China;7. School of Natural Resource & Environment, University of Michigan, USA;1. Laboratório de Ecologia de Bentos, Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, CP 486, CEP 31270-901, Belo Horizonte, Minas Gerais, Brazil;2. Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Rua Augusto Corrêa 01, CEP 66075-110, Belém, PA, Brazil;3. Departamento de Geografia, Instituto de Geociências, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, CEP 31207-901, Belo Horizonte, Minas Gerais, Brazil;4. Amnis Opes Institute and Department of Fisheries and Wildlife, Oregon State University, 104 Nash Hall, 97331-4501 Corvallis, OR, USA |
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| Abstract: | The Selenga River is the main tributary of Lake Baikal (Siberian, Russia). In 2015/2016, the water quality at previously identified contaminated hotspot regions in the lower Selenga River basin was evaluated using resident aquatic macroinvertebrate communities as bioindicators. Benthic macroinvertebrate communities within the Selenga River were found to be relatively sensitive to water pollution as was highlighted by three evaluated biotic indices:Average Score per Taxon (ASPT); Ephemeroptera-Plecoptera-Trichoptera density index (EPT); and Trent Biological Index (TBI). The human impact on the Selenga River basin water quality was evident due to the significant decrease of the biotic indices at several sample locations including downstream of the wastewater discharge point of Ulan-Ude city, in the Dzhida River downstream of the confluence of the Modonkul River, and especially in the Modonkul River near to the mining operations at Zakamensk. At the same time, our study revealed a high self-regeneration ability of the aquatic ecosystem throughout the basin; with resident benthic macroinvertebrate communities appearing to recover in both the Selenga River and the Dzhida River within two to five km downstream of the contamination source. The changes in the benthic communities at the Selenga delta sampling sites were shown to occur under the influence of natural factors such as hydrological conditions and benthic sediment type, which significantly changed from the upper to the lower regions of the delta. For the Selenga delta, a typology of benthic macroinvertebrate communities including a map of their spatial distribution is presented. |
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| Keywords: | Lake Baikal Selenga River Biomonitoring Benthic macroinvertebrate communities |
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