Abstract

The seasonal and vertical distribution of planktonic algae in the Solar Lake (Taba-Egypt) and their relation to some aquatic environmental factors were discussed through the period (Sep. 1996-Aug. 1997). Surface water analysis showed that no remarkable changes were observed in nitrate, silicate and iron, while turbidity, salinity and chloride were changed according to the season. In water column profile, H2S, temperature and salinity showed clear variations between stratification and holomixis. Maximum salinity (199%.) was recorded during stratification at 3–4 m depth. Stratification (Oct-June) appears clearly with changes in temperature (surface 16°C, thermocline up to 53.3°C and the bottom temperature around 47.7°C). Cyanobacterial mats of the Solar Lake are classified into two layers, the upper layer was dominated by coccoide forms while the lower was dominated by filamentous forms. During the period of study, 39 algal species were identified among which were 17 species of Cyanobacteria, 18 species of Bacillariophyta and 2 species of either Chlorophyta or Dinoflagellates.

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