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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «BIOLOGIYA. ECOLOGIYA»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «BIOLOGY. ECOLOGY»
ISSN 2073-3372 (Print)

List of issues > Series «Biology. Ecology». 2024. Vol 49

Assessment of Trophic Status of the Coastal Waters of the Western Part of Lake Baikal According to Hydrochemical Indicators

Author(s)
E. V. Eletskaya, O. A. Timoshkin, I. V. Tomberg
Abstract
According to long-term studies of the pelagial zone, Baikal waters are oligotrophic, while the coastal zone undergoes a significant anthropogenic load, which worsens its ecological state. In the last decade serious changes have been observed here, which are characterized as crisis: there is a massive development of benthic algae, both typical and not typical for Baikal species, blooming of blue-green algae, oppression and even death of Baikal sponges. It is assumed that the main cause of these phenomena is the increase of nitrogen and phosphorus compounds in the coastal zone as a result of uncontrolled development of tourist business, primarily, construction of numerous tourist resorts and hotels without wastewater collection and treatment systems in the water protection zone and multiplied number of units of the fleet servicing the industry. Chemical composition of the nearshore waters of the western part of the Lake Baikal (from the Listvyanka Settl. to Cape Izhimey) was performed to assess the ecological state of the coastal zone in 2020-2021. Water samples were collected twice a year in June and September 2020 and 2021 from the surface at a distance of 1 m from the shoreline at nine stations, with a total of 34 samples collected. The trophic status of the coastal waters of the studied area of the lake was determined based on the data of total nitrogen and phosphorus content, including their mineral forms. It was found that the waters should mainly be identified as mesotrophic according to the total phosphorus content. The total phosphorus content in the coastal water of Listvyanka, Khuzhir Settlements in June, as well as of B. Koty in September 2020 correspond to the values typical for the eutrophic reservoirs. According to the content of total and mineral nitrogen, as well as phosphate phosphorus, the waters of most studied areas were identified as oligotrophic ones. It is shown that organic forms of nitrogen and phosphorus dominate over mineral ones in the coastal waters of the western part of the lake.
About the Authors

Eletskaya Elena Vladimirovna, Postgraduate, Junior Research Scientist, Limnological Institute SB RAS, 3, Ulaanbaatar st., Irkutsk, 664033, Russian Federation, e-mail: lilitanna@lin.irk.ru

Timoshkin Oleg Anatolyevich, Doctor of Sciences (Biology), Professor, Head of Laboratory, Limnological Institute SB RAS, 3, Ulaanbaatar st., Irkutsk, 664033, Russian Federation, e-mail: tim@lin.irk.ru

Tomberg Irina Viktorovna, Candidate of Science (Geography), Senior Research Scientist, Limnological Institute SB RAS, 3, Ulaanbaatar st., Irkutsk, 664033, Russian Federation, e-mail: kaktus@lin.irk.ru

For citation

Eletskaya E. V., Timoshkin O. A., Tomberg I. V. Assessment of Trophic Status of the Coastal Waters of the Western Part of Lake Baikal According to Hydrochemical Indicators. The Bulletin of Irkutsk State University. Series Biology. Ecology, 2024, vol. 49, pp. 19-32. https://doi.org/10.26516/2073-3372.2024.49.19 (in Russian)

Keywords
Lake Baikal, mineral phosphorus, mineral nitrogen, total nitrogen, total phosphorus, trophic status.
UDC
556:504.455
DOI
https://doi.org/10.26516/2073-3372.2024.49.19
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