Grazing impact of microzooplankton on phytoplankton distribution and material cycle in subtropical ocean

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Primary productivity is high in surface layer but phytoplankton biomass is high in subsurface Chl.a maximum layer in the subtropical ocean. To solve this mismatch, grazing of microzooplankton in surface and subsurface layers were observed. Grazing rates in surface layer (0.08～1.05 d^<-1>) were higher than those in Chl.a maximum layer(0.01～0.24 d^<-1>) but the rates were variable in both layers. The higher grazing rate suggests that grazing is one of the factors decreasing phytoplankton biomass in surface layer, but the grazing impact maybe not constantly large.