Files in this Data Supplement:

• Supplemental file 1 - Sediment/soil sample locations (Table S1), primers used in the study (Table S2), sediment and soil characteristics for Elbe River and Ebro River (Table S3), redundancy analysis results for effects of sampling time, location, and depth on geochemical parameters (Table S4), results of qPCR measurements based on 16S rRNA of dechlorinating bacteria and all bacteria in the river basins (Table S5), Spearman’s rank correlations between sediment (soil) parameters and 16S rRNA abundance of dechlorinating bacteria (Table S6), list of rdh genes detected by Geochip (Table S7), changes in the relative abundance and ratio of 16S rRNA copies to 16S rRNA genes for Dehalococcoides spp. in close locations (Fig. S1), DGGE-based clustering of Dehalococcoides spp. in the Ebro River (Fig. S2) and the Elbe River (Fig. S3), and neighbor-joining tree of Dehalococcoides 16S rRNA sequences (Fig. S4).
  MS Word document, 1.95 MB.
• Supplemental file 2 - Data for rdh genes targeted by the GeoChip as used in the study.
  MS Excel file, 25K.