Photosynthetic pigments of plankton in some karst lakes of central Russia

Phytoplankton pigments were studied in seven soft water, weakly mineralized karst lakes in central Russia (Vladimir oblast). The lakes Kshchara, Sankhar, Yukhor, Bol’shoye Poridovo, Svetlen’koye, Bol’shie, and Malye Garavy were investigated. The seasonal dynamics, vertical distribution of chlorophyll a, and its content in the phytoplankton biomass were considered. The relationship between chlorophyll a content and abiotic factors was analyzed. In addition to algae pigments, high concentrations of bacterial chlorophyll d were recorded in meta- and hypolimnetic layers of lakes Yukhor, Kshchara, Sankhar, and Svetlen’koye.