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UCYN-A lineages are distributed throughout surface waters of the Western Arctic Ocean. Background colors represent sea-surface temperature on September 10, 2016 (www.esrl.noaa.gov). UCYN-A was quantified with qPCR. UCYN-A2 (black circles) is present at more stations, but UCYN-A1 (white circles) had the highest maximum abundance. Red stars indicate nanoSIMS measurement locations for 15N-uptake rates.
