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a Group N specific uptake (sum of NO3−, NH4+, and urea specific uptake, h−1) of photosynthetic picoeukaryotes (PPE), Prochlorococcus (pro), and Synechococcus (syn) in each assay. b Contribution of the different N sources to group N uptake (%) in each assay. c Contribution of the different N sources averaged over all assays for each population investigated (%)
