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To determine whether parameters related to hydrography and phytoplankton utilization of nitrogenous nutrients are responsible for the variability in ratios of euphotic zone-integrated bac- terial production (BP) to primary production (PP), we measured bacterial production, primary pro- duction, new production, regenerated production and environmental variables in the euphotic zone in May 1995 and June 1996 at a frontal region in the Yellow Sea. The BP/PP ratios were highly vari- able with different hydrodynamic conditions, ranging from 0.03 for mixed waters to 0.40 for stratified waters. The BP/PP ratios were significantly correlated (r 2 = 0.64, p < 0.01) with water-column stabil- ity of the euphotic zone and, to a greater degree, with sea-surface temperature (SST; r 2 = 0.74, p < 0.001). SST was also closely correlated with water-column stability (r 2 = 0.91, p < 0.0001). An inverse relationship was found (r 2 = 0.61, p < 0.01) between BP/PP and ƒ-ratios, indicating close association of the variability of the BP/PP ratios with the relative utilization of nitrogen by phytoplankton. High BP/PP values were found when the euphotic zone was stratified and phytoplankton mostly depended on ammonium for nitrogen source, and low BP/PP values were found when the euphotic zone was completely mixed and phytoplankton mostly depended on nitrate. Our results suggest that both tur- bulent mixing and water temperature were underlying physical forces regulating variations in BP/PP ratios in the Yellow Sea. It might be possible to predict energy pathways in the Yellow Sea and, pre- sumably, in other marine environments by remote-sensing of SST and ocean color.

Sea-surface temperature and f-ratio explain large variability in the ratio of bacterial production to primary production in the Yellow Sea