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. The Kuroshio Current has been thought to be biologicallyunproductive because of its oligotrophic conditions and low planktonstanding stocks. Even though vulnerable life stages of major foraging fishesrisk being entrapped by frontal eddies and meanders and encountering lowfood availability, they have life cycle strategies that include growing andrecruiting around the Kuroshio Current. Here we report that phytoplanktongrowth and consumption by microzooplankton are stimulated by turbulentnitrate flux amplified by the Kuroshio Current. Oceanographic observationsdemonstrate that the Kuroshio Current topographically enhances significantturbulent mixing and nitrate influx to the euphotic zone. Graduated nutrientenrichment experiments show that growth rates of phytoplankton andmicroheterotroph communities were stimulated within the range of theturbulent nitrate flux. Results of dilution experiments imply significantmicrozooplankton grazing on phytoplankton. We propose that these rapid andsystematic trophodynamics enhance biological productivity in the Kuroshio.

biogeosciences

Phytoplankton growth and consumption by microzooplankton stimulated by turbulent nitrate flux suggest rapid trophic transfer in the oligotrophic Kuroshio