WATER CHEMISTRY AND ALGAL VEGETATION OF RESERVOIRS IN SOUTHWESTERN SAUDI-ARABIA

Water chemistry and algal vegetation of five reservoirs in south-weste rn Saudi Arabia were surveyed in August 1991. The waters were slightly alkaline with varying levels of nutrients. Inorganic nitrogen concent rations were high at all sites. The ratio of monovalent to divalent ca tions was not especially high. Micronutrient levels were high at certa in locations. Green algae were found at all sites and dominated by the three orders Chlorococcales, Cladophorales and Zygnematales. Blue-gre en algae were found at all but one site; certain species were restrict ed to a particular location.