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Numbers of probe-positive bulk sediment bacteria or endophytes present in field-grown S. pungens. Eight 5-by-4-m plots containing S. pungens were established in the intertidal zone, and oil was applied to four of these plots in June 1999. At 6 and 8 weeks after the oil application, the genotype prevalence in the root interior and bulk sediment was assessed. Each bar shows the average of eight replicates. The error bars show the standard error of the mean.
