Figure 2

Differences between bacterial communities during deoxygenation of the seafloor. Ordination plots for (a) moderate and (b) rare OTUs of bacterial 16S rRNA genes were constructed using scores of linear discriminant axes (LD) 1 and 2 produced by nonparametric and Bray-Curtis dissimilarity based discriminant analysis. Only the best discriminating bacterial OTUs are named. (a) 100% of the community compositions (n = 20) were correctly classified (p = 0.0001) based on the duration of deoxygenation. The discriminant analysis used 12 principal coordinates capturing the largest amount of variation (71% of total variation). (b) 75% of the community compositions (n = 20) were correctly classified based on the duration of deoxygenation (p = 0.0001). 7 principal coordinates, which explained 46% of the total variation, were used in the discriminant analysis. Ticks on the top of symbols mark within – treatment plot replicates showing their variation.