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Principal component analysis of bacterial species revealing taxonomic distance between sampling sites and species causing separation. Samples collected in 2012 and 2014 cluster together due to a higher relative abundance of Bacteriodetes (Sphingobacteria, Saprospirae), whereas samples collected in 2013 contain higher proportions of Betaproteobacteria and Cyanobacteria (Nostocophicidae, Oscillatoriophycideae).
