Fig. 1

Principal coordinates analysis (PCO) ordination of the first two axes. For each subfigure (a, b, c and d), coloured symbols represent the sample site for S. diversicolor in marine lakes in Berau: Kakaban lake (BrK), Haji Buang lake (BrM), Tanah Bamban lake (BrT); Papua: Marine lake K (PaK), Marine lake M (PaM); and in open sea habitat: Taiwan (Taw). a OTU symbols are shown in grey and the circle size of the OTU is proportional to their abundance (number of sequences) as indicated by the symbol legend in the top left corner. b OTU symbols colour-coded according to their taxonomic assignment to selected phyla: Proteobacteria (red), Cyanobacteria (blue), Bacteroidetes (green), Actinobacteria (purple) and Planctomycetes (yellow). c PCO ordination including only the most open (BrT and PaM) and closed lakes (BrK and PaK) in Berau and Papua. d PCO ordination including S. diversicolor samples from Berau (BrK, BrM and BrT), Papua (PaM and PaK), open sea habitat in Taiwan (Taw), and water samples (water)