Monitoring of  Black Sea algal viruses Tetraselmis  viridis and Phaeodactylum tricornutum in bays  of  Sevastopol as a component of ecological monitoring of the studied aquatories

O.A. Stepanova

Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

Email: solar-ua@ya.ru

DOI: 10.33075/2220-5861-2020-3-139-148

UDC 578.4(262.5) 

Abstract:

   Virus monitoring is a widespread control of their background circulation. Since 2002, the monitoring of algal viruses that infect microalgae Tetraselmis viridis and Phaeodactylum tricornutum has been carried out in the bays of Sevastopol differing in ecological conditions. The purpose of this work is to analyze and assess the results of this long-term (2002–2020) monitoring.

   The results obtained with taking into account the exactingness or resistance to environmental conditions of hosts of algal viruses that infect microalgae T. viridis and P. tricornutum  were the basis for the following conclusions regarding the ecological well-being of the studied bays of Sevastopol:

– relatively favorable ecological conditions in 2007–2008, 2017–2018 and in 2020. (maximum frequency of isolation PtV, and/or minimum TvV, and / or maximum difference in frequency of isolation between PtV and TvV);

– unfavorable ecological conditions in 2002–2003, 2006 and 2015 (maximum frequency of isolation TvV, and/or minimum PtV, and/or maximum difference in frequency of isolation between TvV and PtV).

   Analysis of the monitoring results of algal viruses of T. viridis and P. tricornutum in 2015–2020 revealed that the studied relatively ecologically safe bays are characterized by the maximum number of all isolates of algal viruses (both TvV and PtV) and the numerical predominance of strains of algal virus of P. tricornutum, which is demanding to environmental conditions. At the same time, the minimum amount of all viral isolates was recorded in the ecologically unfavorable bay.

   The results of a long-term monitoring of algal viruses of T. viridis and P. tricornutum have established the possibility of using the monitoring of marine viruses, in particular of algal viruses  of microalgae which are indicative of the ecological situation, as a component of complex ecological monitoring as ecological indicator.

Keywords: monitoring, algal viruses, microalgae Tetraselmis viridis and Phaeodactylum tricornutum, bays of Sevastopol, Black Sea.

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