Affiliation:
1. Atlantic branch of «VNIRO»; P.P. Shirshov Institute of Oceanology RAS
2. P.P. Shirshov Institute of Oceanology RAS
Abstract
The aim: to assess the ecological state of the Gulf of Finland in the summer of 2020 using the benthic index of the ratio of opportunistic polychaetes/amphipods (BOPA) and the benthic index of the ratio of opportunistic annelids/amphipods (BO2A).Research material and methods: the material was collected during the 55th cruise of the PV Akademik Ioffein July 2020. To assess the ecological state of the Gulf of Finland CTD‑soundings and macrozoobenthos data were used, the BOPA and BO2A indices were calculated.Results: the obtained values of the ecological state of water body based on the BOPA and BO2A indices in this study characterize the quality of the sea along the central part in the Gulf of Finland. The negative statistically significant correlation between indices BOPA, BO2A and concentration of the dissolved oxygen are established.Practical significance: a complete picture of the ecological state of the Gulf of Finland in 2020 was obtained. The presented data showed that the concentration of dissolved oxygen in the bottom layer, under conditions of unstable salinity stratification, affects the values of the BOPA and BO2A indices through the tolerance of various taxonomic groups. BOPA and BO2A indices can be used in assessing water quality
Publisher
Russian Federal Research Institute of Fisheries and Oceanography
Reference25 articles.
1. Balushkina E.V., Maximov A.A., Golubkov S.M., Tsiplenkina I.G. 2008. Zoobenthos of the open waters of the Neva River estuary // Ecosystem of the estuary of the Neva River: biological diversity and environmental problems. Moscow: Association of Scientific Publications of the KMK. P. 156– 183. (In Russ.).
2. Berezina N. A., Maximov A. A. 2016. Abundance and food preferences of amphipods (Crustacea: Amphipoda) in the Easter Gulf of Finland, Baltic Sea // Journal of Siberian University. Biology. V. 9. № 4. P. 409–426. DOI 10.17516/1997–1389–2016–9–4–409–426. (In Russ.).
3. Eremina T.R., Maximov A.A., Voloschuk E.V. 2012. Effects of climatic variability on deep-water oxygen conditions in the Eastern Gulf of Finland // Okeanologiya. V. 52. № 6. P. 836–845. (In Russ.).
4. Krek A. V., Krek E. V., Ezhova E. E., Paka V. T., Kondrashov A.A., Danchenkov A. R., Bagirov N. E., Kudryavtzeva E. A., Bubnova E.S., Sergeev A. Ju., Aleksandrov S.V. 2021. Field research in the Baltic Sea during 55th cruise of the P/V Akademik Ioffe // Oceanologiya. Vol. 61. № 4. P. 662–665. (In Russ.). https://doi.org/10.31857/S0030157421040067
5. Maximov A.A. 2006. The causes of formation of near-bottom hypoxia in the Eastern Gulf of Finland (Baltic Sea) // Okeanologiya. V. 46. № 2. P. 204–210. (In Russ.).