Figure 4

Variation in alpha and beta diversity during deoxygenation of the seafloor. Variation in Shannon H’ indexes for (a) terminal restriction fragments created by HaeIII (n = 88) and (b) 16S rRNA gene sequences (n = 2 113 037) as well as (c) treatment-wise Bray-Curtis distances of 16S rRNA gene sequences. The solid line depicts the median. The mean of Shannon H’ is positioned in the middle of the box.