Diatoms of bottom sediments in adjacent located lakes of the Republic of Khakasia

The study of bottom sediments is one of the most important tasks in the reconstruction of paleoclimate. Of special note are meromictic lakes, in which sediments retain their layering. High salinity in the bottom layer of water contributes to "conservation" of newly deposited material. Diatoms are one of the main paleoindicators of the reservoir development, due to the fact that, thanks to the durable silica shell, they persist for many centuries in the sediments. Earlier Kern of lake Shira has already been analyzed on the species composition of diatoms. There analysis revealed new information that was represented in this work. Also a comparative analysis of diatoms of bottom sediments of two nearby lakes Shira and Utichye-3 (Khakassia, Russia) was carried out. The results of the analysis showed that both lakes were less mineralized in the past than at present, and the climatic conditions in the region of the lakes changed repeatedly.