Lake sediment was sampled for chemical analysis in combination with targeting the diversity by 16S rRNA sequencing with Illumina paired MiSeq Sequencing. Bacteria colonising Tar sediment

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.