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Relative abundance of bacterial groups in the Beaufort Sea (top) and Chukchi Sea (bottom). Each bar is the abundance in one sample. There were nine samples from the Beaufort Sea (six summer and three winter samples) and eight samples from the Chukchi Sea (four summer and four winter samples). Error bars are ±standard errors (SE) of probe-positive cells from 10 fields of view. Probe-positive cells are expressed as a percentage of all cells.
