Plankton of 12 natural water bodies located in the water basin of the middle Lena River in the area of the anticipated oil-pipe line, referred to as the East Siberia – Pacific Ocean system, includes 125 algae species found. From floristic and eco-geographic angles, phytoplankton is typical to algae communities of the northern water basins. By quantitative development of phytoplankton natural water bodies are characterized as oligotrophic. Features of composition and distribution of phytoplankton connected with their hydrological and geographic conditions of the water basins studied are found. The data available present the need for further research in conducting biomonitoring under conditions of increasing technogenic loads on water ecosystems of the middle Lena basin.

Keywords: phytoplankton, rivers, thermokarst lakes, the middle Lena River basin

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