Ordination diagram by CCA analysis of the important zooplankton taxa as a function of environmental variables (See Table VI for some abbreviations, other abbreviations are Amphorellopsis acuta (Aacu), Bursaridium sp.(Busp), Climacostomum virens (Cvir), Euplotes sp. (Eusp), Dichilum platessoides (Dpla), Favella adriatica (Fadr), Helicostomella subulata (Hsub), Stenosemella nivalis (Sniv), S. ventricosa (Sven), Strobilidium sp. (Stsp), Tillina sp. (Tisp), Tintinnopsis beroidea (Tber), T. cylindrica (Tcyl), Vasicola ciliata (Vcil), Undella hyalina (Uhya), Brachionus calyciflorus (Bcal), B. plicatilis (Bpli), Ectopleura dumortierii (Edum), Acartia grani (Agra), Centropages kroyeri (Ckro), Clytemnestra scutellata (Cscu), Diacyclops bicuspidatus odessanus (Dbico), Microsetella norvegica (Mnor), Onychocamptus mohammed (Omoh), Evadne tergestina (Eter), and Limacina inflata (Linf)). Temp (temperature), SDT (Sechi disk Transparency), Sal (salinity), Sil (SiO3), Amm (NH4), Nit (NO2), Nat (NO3), Phos (PO4), and Chla (chlorophyll a). A, B, and C are estuary downstream, midstream, and upstream, respectively.