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Microzooplankton grazing impact (<200 pm fraction) on phytoplankton along a salinity gradient in the Estuary of Mundaka (Bay of Biscay, Spain) was analyzed dunng summer (August 1990) using a serial dilution method. Both microzooplankton grazing rate and phytoplankton growth rate were high (mean g = 0.75 d-l, mean k = 1.90 d-' respectively), and well correlated, denoting an optimization in the efficiency of energy transport through the pelagic food web. Microzooplankton herbivory represented a mean loss of 38% of initial standing stock of chlorophyll and 46% of potential phytoplankton primary production in the inner zone of the estuary, where changes in phytoplankton biomass were mainly a function of initial hiomass. In the intermediate and outer zones, microzooplankton grazed around 54 % of initial standing stock of chlorophyll and more than 60% of potential phytoplankton primary produchon. In these zones, changes in phytoplankton biomass were mainly a function of phytoplankton growth. In spite of the importance of microzooplankton grazing, this factor alone cannot be responsible for the observed phytoplankton distribution along the salinity gradient.

Microzooplankton grazing in the Estuary of Mundaka, Spain, and its impact on phytoplankton distribution along the salinity gradient