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(a) Spatio-temporal clustering according to the similarity matrix generated from archaeal 16S rRNA gene DGGE fingerprints and UPGMA clustering method. Code indicates month.depth. Six selected samples (bold labeling) were further studied by cloning and qPCR analysis. (b) Samples clustering according to changes in environmental parameters (chlorophyll a, DOC, nutrients, oxygen concentrations, cells abundance and temperature) based on a hierarchical ascendant classification analysis.
