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NEW DATA ON THE ABUNDANCE AND VERTICAL DISTRIBUTION OF VIRIOPLANKTON IN THE DEEP-WATER AND NERITIC ZONES OF THE BLACK SEA

M. A. Ufimtseva,V. S. Mukhanov

Journal of Oceanological Research(2024)

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摘要
Viruses play a key role in the functioning of marine ecosystems, controlling the number and activity of microorganisms. However, the virioplankton of the Black Sea has been practically unstudied. In this work, for the first time, quantitative data on the distribution of viruses in the water column of the Black Sea was obtained by direct counting using epifluorescence microscopy. The research was carried out in October 2022 on cruise 124 of the R/V “Professor Vodyanitsky”. Samples were taken on the shelf off the coast of Crimea and along a secular section towards the center of the cyclonic circulation. In accordance with the results obtained, the total abundance of virioplankton varied in the range of 0.4–11.6×106 particles/ml and averaged 4.83±2.52×106 particles/ml. The maximum values were found in the aerobic zone, the minimum – in the hydrogen sulfide zone. A gradual increase in the number of viruses within the hydrogen sulfide zone to 2.7×106 particles/ml could be associated with the formation of a more durable capsid and, accordingly, slow destruction of particles, as was shown under similar conditions for Baltic Sea viruses. The ranges of changes in the abundance of virioplankton and the virus/bacteria ratio (from 3 to 90) in the deep-sea part of the Black Sea and their decrease with depth were consistent with observations in other areas of the World Ocean. The data obtained fill the gap in knowledge about virioplankton in the Black Sea.
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