Fig. 3: Habitat-specific sediment biogeochemical and microbial characteristics.
Sediment biogeochemical (a) and microbial (b, c) characteristics during the sampling in summer. (a) Sediment microprofiles for O2 and organic carbon (OC) contents. (b) NMDS plot of the Bray-Curtis dissimilarity index between the three habitats. The results are based on the whole 16S rRNA gene identified microbial community. The plot shows data from the first 5 cm layers in the sediment. The pseudo-F and P values show the statistical results from PERMANOVA (9999 permutations) based on testing all three habitats together. c Stacked bars showing the known methanogenic archaeal community (according to the SILVA v138.1 database) on the lowest taxonomic classified level during the sampling in July (J) and August (A). The y-axis shows the different sediment layers, while the x-axes show the relative abundance (% of all archaea, labels only shown on first x-axis). “Other archaea” denote groups <0.1% average of all samples. Taxonomic labels in color denote known methanogens in the dataset according to scientific literature. Note that for the station “bare sediments”, samples could only be collected down to 9 cm (July) and 12 cm (August). Empty cells denote that no archaea were detected in the dataset.
