ECOLOGICAL ASSESSMENT OF CHEBAISH MARSH USING INDEX OF BIOLOGICAL INTEGRITY FOR PHYTOPLANKTON COMMUNITY

Abstract

Indices of Biological Integrity (IBIs) are being increasingly used as useful and direct tools for assessing general health of aquatic ecosystems.For that P-IBI were used to assess the quality of water in the Chebaish marsh during 2008-2009 ,four stations were selected. Used six units in the evaluation (the percentage of each Pennales diatoms , centrales diatoms ,Blue-green algae ,green algae, Dianoflagellate and concentration of Chlorophyll a). Percentage of diatoms especially Centrales have a clear impact in the value of (P-IBI), and concentration of chlorophyll a, percentage of blue-green algae and dianoflagellate also have a distinct role in the calculation of the P-IBI.The results showed that the value of P-IBI was high during winter and decreased during the dry season and reached 53 at August due to decline in water discharge to marsh during 2008 associated by increasing in temperature and evaporation.