Algae flora of inundated floodplain lakes of the Lena River basin was investigated for the first time. A comparative analysis of algae taxonomic structure from the floodplain lakes and those located in the area of fluvial terrace above the floodplain, including part of the middle Lena, was carried out. The peak of species diversity of the floodplain lakes investigated is marked during their maximal water heating at the end of July–early August. High similarity of species composition in algae from the floodplain and the Lena River was found. In our opinion, it was connected to algae from being carried from the river during floods. Similarity between algae floras of the lakes investigated and the ones located higher on the fluvial terrace not affected by floods within the middle Lena area is low.

Keywords: algae flora, taxonomic structure, inundated floodplain lakes, middle Lena area

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