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Uptake of inorganic and organic nitrogen (N) by phytoplankton and bacteria was inves- tigated during a mesocosm study conducted in Raunefjord, Norway in April 2005. One mesocosm was fertilized with nitrate and phosphate at a ratio of 16:1 and maintained in the light, while one un- amended light mesocosm served as a control. Dissolved nutrients, phytoplankton and bacterial bio- mass, and phytoplankton community composition were monitored throughout the 26 d experiment. Uptake of 15 N-labeled ammonium and nitrate, and dual-labeled ( 15 N and 13 C) urea and dissolved free amino acids (DFAA) was measured for phytoplankton and bacteria using 2 methods: size fractiona- tion into 0.2-0.8 and >0.8 μm size classes, and flow cytometric sorting based on chlorophyll autoflu- orescence. Prior to fertilization, dissolved inorganic N concentrations were low and comprised ~5% of total dissolved N. Added nitrate was completely utilized in the amended mesocosm within 10 d, stimulating a large bloom of colonial Phaeocystis pouchetii. Ammonium contributed over half of total measured N uptake by phytoplankton and bacteria in both enclosures, while nitrate and urea each supplied roughly 10 to 25%. Overall, DFAA were a negligible N source to phytoplankton but con- tributed 11% to total bacterial N uptake. Bacterial uptake represented a significant portion of total uptake of all N forms, especially urea and DFAA. Comparison of the 2 methods for measuring phyto- plankton versus bacterial uptake demonstrates how the use of 0.8 μm filters can lead to significant overestimation of phytoplankton N uptake due to the retention of bacterial biomass.

aquatic microbial ecology

Nitrogen uptake by phytoplankton and bacteria during an induced Phaeocystis pouchetii bloom, measured using size fractionation and flow cytometric sorting