Size and dry weight of main zooplankton species in Bariri reservoir (SP, Brazil)

Abstract

In order to generate a database for secondary production studies in the São Paulo State (Brazil) reservoirs, the size and dry weight of 13 zooplankton species from Bariri reservoir (middle Tietê River) were determined. Diameter and dry weight of eggs from some cladoceran and copepod species were also determined. Sizes varied from 108.6 μm (Keratella tropica) to 2488.6 μm (females of Argyrodiaptomus azevedoi), while dry weights varied between 0.025 μg (K. tropica) and 51.250 μg (females of A. azevedoi). Egg diameters varied between 75.0 μm (Mesocyclops ogunnus) and 171.8 μm (Ceriodaphnia silvestrii), while egg dry-weights varied between 0.074 μg (Acanthocyclops robustus) and 0.865 μg (Bosmina hagmanni). Size and dry weight distribution of the zooplanktonic organisms was not linear in the Bariri reservoir.