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. 2017 Jan 24;7:41315. doi: 10.1038/srep41315

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Copyright © 2017, The Author(s)

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Bulk seawater N uptake rates at (a) station LDA, and (b) station LDB (note the different scale ranges on the y-axis). Trichodesmium (c,d) ¹³C -filled circles- and ¹⁵N -open circles- atom % enrichment values, and (e,f) ¹³C and ¹⁵N uptake rates at stations LDA and LDB, respectively. Error bars for C or N uptake rates (a,b,e,f) represent the standard error, while error bars for atom % graphs (c,d) represent the standard deviation of the mean. Straight and dotted lines in (c,d) indicate the average ¹³C and ¹⁵N atom % enrichment, respectively, of time zero samples (average natural abundance). Asterisks indicate statistically significant differences (Mann Whitney test, p < 0.05).