Phylum-level diversity of bacterial (a), archaeal (b) and eukaryotic (c) communities in Lakes FRX and WLB during summer (Sum) and autumn (Aut). Bacterial and archaeal OTUs were determined at 97% sequence similarity, and eukaryotic OTUs were determined at 94% sequence similarity. Alpha, Beta, Gamma and Delta refer to the subclasses of Proteobacteria. MGI refers to Marine Group I Crenarchaeota, TGC refers to Terrestrial Group Crenarchaeota and SGC refers to Soil Group Crenarchaeota.