Kuchko, T. Yu., Ilmast N.V., N, Kuchko Ya. A., Y PLANKTON COMMUNITIES OF LAKE OKHTANYARVI (NORTH-WEST KARELIA) // Proceedings of Petrozavodsk State University. 2018. No 8 (177). DOI: 10.15393/uchz.art.2018.247


General Biology

PLANKTON COMMUNITIES OF LAKE OKHTANYARVI (NORTH-WEST KARELIA)

Keywords:
monitoring
freshwater ecosystem
phytoplankton
zooplankton
species composition
abundance
biomass
trophic status		 Summary: Inventory of the current state of the communities of phyto- and zooplankton of Lake Okhtanjarvi was carried out for the first time. The lake, thanks to its geographical location, is a part of the Green Belt of Fennoscandia. Species diversity, the ratio of the main taxonomic groups, the structure of the dominant species of hydrobionts, their abundance and biomass in the littoral and pelagic zones of the lake have been studied. The results of the research showed that according to the level of quantitative development of phytoplankton in the summer of 2013, the waters of Lake Okhtanjarvi can be attributed to the third class of quality, category 3a ("sufficiently clean"), which corresponds to the β-mesosaprobic zone by the scale of saprobity.The average value of the index of saprobity, calculated from the quantitative ratio of indicator zooplankton species, makes it possible to classify the lake as an oligosaprobic class (2nd class of quality, pure natural waters). Lake Okhtanjarvi can be considered as a convenient control water body in monitoring the state of the environment in the border areas.



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