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Longitudinal Difference in Zooplankton Grazing on Phyto- andBacterioplankton in the Nakdong River (Korea)

Microzooplankton (35‐157 µm, rotifers and nauplii) and macrozooplankton (>157 µm, cladocerans and copepods) grazing on bacteria and phytoplankton were evaluated at two stations along the Nakdong River. The lower site was more eutrophic with much higher chlorophyll a concentration and total zooplankton biomass (105 µg C L ‐1 ) than the upper site (13.2 µg C L ‐1 ). At both sites bacterial carbon was lower than phytoplankton carbon and mean microzooplankton biomass was higher than macrozooplankton biomass. However, biomass specific clearance rates were higher for the macrozooplankton in contrast to the community clearance rates which were higher for the microzooplankton. Carbon ingestion rates were about ten times higher for the lower station (up to 40 µg C L ‐1 d ‐1 for phytoplankton and 5 µg C L ‐1 d ‐1 for bacteria). Here a mean community clearance rate for the microzooplankton of 44.6% d ‐1 was reached.