A map and photographs showing the sampling sites colonized with the eelgrass Zostera marina and the unvegetated sites in the shallow lagoon of Swan Lake, Yellow Sea, Northern China (Fig. S1); rarefaction curves of the numbers of observed NifH OTUs based on clone libraries (A) and of bacterial 16S rRNA gene OTUs based on the Ion Torrent sequencing data set (B) for vegetated (V1 to V3) and unvegetated (U1 to U3) sediment samples (Fig. S2); maximum-likelihood tree based on NifH protein sequences showing that SL1 sequences obtained in this study and NB3 sequences from Brown and Jenkins (Environ Microbiol 16:3128-3142, 2014) represent the same clade in which Geopsychrobacter electrodiphilus is included (Fig. S3); maximum-likelihood tree based on NifH protein sequences showing that SL2 sequences obtained in this study cluster well with NB7 sequences from Brown and Jenkins (Environ Microbiol 16:3128-3142, 2014), forming a clade that contains a cultured representative, Desulfocapsa sulfexigens (Fig. S4); details of the cable bacteria-like cluster in the 16S rRNA-based NJ tree shown in Fig. 2D (Fig. S5); environmental variables at sites vegetated with Z. marina and unvegetated sites in the Swan Lake (Table S1); Spearman’s rank correlations between relative abundances of dominant nifH T-RFs and environmental variables measured in this study (Table S2); summary of Ion Torrent sequencing of bacterial communities and alpha diversities in vegetated (V1 to V3) and unvegetated (U1 to U3) sediments of Swan Lake (Table S3).
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