Table S1 Diatom species identified morphologically and its taxonomic group as well as genetic information on rbcL DNA reference sequences for each detected species.

Table S2 Haplotypes obtained from the NSA-3 core using rbcl_76 and rbcL_67 PCR.

Table S3 Genbank accession numbers of DNA sequences retrieved from single algae cultures.

Fig. S1 Parallel short cores NSA-3/4. Picture, 210Pb ages and lithological description of the different sediment layers.

Fig. S2 Alignment of haplotypes.

Fig. S3 Baysian phylogenetic tree for the 28 verified haplotypes and the outgroup Bolidomonas pacifica.

Fig. S4 Rarefaction curves.

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