Bacteria species: B1; Burkholderia xenovorans, B2; Methylobacterium sp, B3; Klebsiella sp, B4; Rhodococcus spp., B5-B12; Unidentified species. Diatom species: D1; Achnanthes brevipes, D2; Amphora coffaeformis, D3; Melosira varians, D4; Phaeodactylum tricornutum, D5-D6; Stauroneis constricta, D7; Thalassiosira weissflogii, N1-N3: Assemblage of diatom species from Kiel Fjord.Sediment core M772-003-2 with depth 8 - 1413 cm.The asterisk symbol (*) denotes that the d13C values were obtained from Larsen et al. (2013, doi:10.1371/journal.pone.0073441).