Biochemical Assessment of the Production and Destruction Balance of the Microplankton Community in the Northern Part of the Black Sea in the Autumn and Spring Seasons
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Abstract
The work is based on material collected on cruise of the R/V "Professor Vodyanitsky" in seasons similar in hydrophysical characteristics: in October 2016 and in March - April 2017. Variations in the distribution of the heterotrophic photoautotrophic index of microplankton (HPI) were considered, based on the ratio of ATP concentrations (as an indicator of metabolically active biomass) and chlorophyll a (as an indicator of its photoautotrophic part). The method of estimation of the ratio of biomasses of heterotrophic and photoautotrophic components of microplankton was applied, and the assessment of the community's productive and destructive succession was carried out. It is shown that in the autumn season, the studied waters of the polygon, based on the content of ATP, can be estimated as mesotrophic, in the spring – close to eutrophic. According to the HPI, heterotrophic forms of microplankton dominated most of the water area during the autumn season, and the parity ratios of heterotrophic and photoautotrophic microplankton during the spring season. When comparing the distribution of metabolically active biomass and NRI, the stage of production-destructive succession of microplankton in the autumn season can be characterized as developing, in the spring – as Mature.
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