English

Abstract

In limnological studies Phytoplanktons are the primary considerations.Algae which are freely percolated with mean of water current are considered as phytoplanktons.All algae are not considered as phytoplanktons like Chara, Nitella these are the macroscopic Alga which grows profoundly in any fresh water bodies carrying suaitable ecophysiological environment to them. Algae are the photosynthetic producers which accounts approx. one third of total photosynthetic activity on this planet. Our study deals with a freshwater lake ecosystem. In limnology of a lake we found dominance of algal genera belongs to Chlorophyceae, Bacillariophyceae, Cyanophyceae Class. However, Euglenophyceae class may present but its population depend upon trophic status of Lake. Present paper deals with periodical analysis of few unicellular phytoplanktons and one filamentous genera Prasiola which is a new citation to Bikaner Phycology. Gajner lake was selected for our study which located around 33 kms away from Bikaner toward west side. Study was carried out for one year January 2017 to December 2017.We collected samples from 3 sites of Gajner lake twice in a month. Now Gajner Lake is the part of wildlife sanctuary. A historical tourist site Gajner palace also located along with lake. So, it is less polluted. Due to trophic level of lake Chlorophycean alga profoundly present in the lake. Although a portion of Lake is under village panchayat which is openly accessed by the local people of Gajner village. The open access site of lake has totally different phytoplanktonic density.