Lake sediment was sampled for chemical analysis in combination with targeting the diversity by 16S rRNA sequencing with Illumina paired HiSeq Sequencing

High PAH loads in the sediment are a strong environmental filter selecting for particular bacterial types. We show how the composition of bacterial community shift along a gradient from pristine lake sediment, tar contaminated lake site and a site downstream, which might be effected by transport processes and bacterial dispersal downstream of the contaminated site.