Abstract
Changes of deep mountain-steppe oligo-mesotrophic lake Yaktykul (Bannoe) over the past 230 years were studied based on diatom analisis of the sediments core. Identified species and varieties of diatoms (126) were represented mainly by planktonic-benthic alkaliphiles, oligohalobes, β-mesosaprobes and oligosaprobes. Five diatom zones were distinguished. Small cyclic diatoms (Stephanodiscus parvus, Pantocsekiella comensis) increase in the upper part of the sediment core was observed. Changes in total phosphorus (TP) concentration were reconstructed. Until the middle of the twentieth century, the content of TP correlated with growing season temperature, and then with annual precipitation, which could be explained by increasing role of phosphorus inflow from the catchment.
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