TROPHIC STATUS OF BLAGOPOLUCHIYA BAY (THE SOLOVETSKY ARCHIPELAGO OF THE WHITE SEA) IN THE SUMMER OF 2024.

The researchers have assessed the trophic status of Blagopoluchiya Bay (the Solovetsky Archipelago of the White Sea) based on the content of nutrients and chlorophyll “a”, species composition and quantitative indices of phytoplankton and zooplankton. High content of total phosphorus (up to 640 μg/L) and total nitrogen (up to 2.50 mg N/L) in water indicates a significant anthropogenic load on the bay and determines its trophic status as eutrophic-hypertrophic. The concentration of chlorophyll “a” in the bay water varied from 1.23 to 3.73 μg/L, according to which the middle part of the bay was classified as oligotrophic-mesotrophic, and the apex part as mesotrophic-eutrophic. The phytoplankton development indicators in different parts of Blagopoluchiya Bay varied within the range: the number was 66—2502 thous. cells/L and the biomass was 372—2059 mg/m3. Diatoms and dinoflagellates dominated in the phytoplankton composition. The highest numbers and biomass of phytoplankton were observed in the most polluted, apex part of the bay, where cyanobacteria dominated. The abundance of zooplankton at most stations significantly exceeded the average long-term values in the coastal zone of the White Sea at this time of year, but was significantly below the norm at the most polluted station. The state of Blagopoluchiya Bay according to chemical and biological indicators shows an extremely unfavorable environmental situation, which determines the need to reduce the nutrient load on the bay.

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