SOME OBSERVATIONS ON THE ECOLOGY OF DESMIDS.

The article presents the study regarding the nature and composition of desmid plankton. The main problem of the study is the recognition of euplanktonic as opposed to tychoplanktonic desmids and the distinctiveness and antiquity of the euplanktonic community. The solution is to use phytoplankton quotients for the determination of lake trophicity, where the number of planktonic desmid species may form the denominator. Moreover, the division between euplanktonic and facultatively planktonic desmids is said to be unreal, though a real distinction may be made between the groups together with the non-planktonic desmids.