Authors: Azma Hanim, I. and Russell Shiel and Friedrich Recknagel
Zooplankton samples have been collected from South Para Reservoir which is a water storage that supplies drinking water to the southern metropolitan area of Adelaide, South Australia. The study was carried out in order to provide the earliest information on zooplankton community in the drinking water reservoir. Over 18 months of the study, a total of 20 taxa of zooplankton were recorded. Rotifera was the most diverse group, accounting for 10 taxa followed by Cladocera and Copepoda with 6 and 4 taxa respectively. In terms of density, copepods were the dominant taxonomic group representing 57% of the total density while cladocerans were around 31% over the whole study period. Rotifers were the least prevalent of total density (12%) even though it became important in relation to total taxa number. The Cladocera group was dominated by Daphnia lumholtzi and Ceriodaphnia cf. quadrangula while Rotifera was dominated by Asplanchna priodonta and Polyarthra dolichoptera. Copepoda were dominated by cyclopoid Microcyclops sp. and calanoid Calamoecia ampulla, making up the largest portion of total zooplankton density. Physical and chemical conditions of the water including water temperature, oxygen concentration, as well as concentrations of nutrients might contribute to the differences in zooplankton composition.
Keywords: zooplankton, South Para Reservoir, Cladocera, Copepoda, Rotifera