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Distribution of total and Desulfonema-like rRNAs at 100-μm depth intervals in relation to oxygen. The abundance of Desulfonema is represented by the unshaded region in the total-abundance plot and individually in the inset plot. The medians and ranges for the one-half maximum-oxygen (open triangle) and minimum-oxygen (filled triangle) concentrations were calculated from six independent microelectrode measurements as discussed in the text.
