p. 189 - 203

IMPACT OF HEAVY METALS ON THE PRIMARY PRODUCTION


A. N. Khalil 1), A. M. Ibrahim 2) 
1) Oceanography Department, Faculty of Sciences,
   Alexandria, University, Alexandria, Egypt
2) Institute of Oceanography and Fisheries, Alexandria, 
   Egypt 


Abstract
Effect of different concentrations of some heavy metals
on the preliminary production was studied at two locali-
ties near Jeddah (Red Sea), by estimating chlorophill-a.
Metal toxicity of the phytoplankton, and can be arranged
in the following order: Pb> Zn> Ni> Cd. More depress on
the phytoplankton productivity took place, when Zn accom-
panied another/other metal (s) in the media. Impact of
heavy metals on the primary production at the sheltered
area (inside Obhur Creek), was relatively higher than 
that observed at the exposed area (Open Sea).