freshwater mountain lake benthic habitats: sediment or lithic biofilm 16S Raw sequence reads

The lakes are located in the central region of the Pyrenees mountain range within the Aigüestortes i Estany de Sant Maurici National Park. The lakes are dimictic and ultra-oligotrophic (total phosphorus [TP] < 150 nM) except for Bassa de les Granotes, which is classified as oligotrophic (150 < TP < 300 nM) and show a circumneutral pH (~7).All main benthic habitats in the lakes were considered, although some are only present in a few lakes. Plan lake is particularly rich in macrophytes, including isoetids (Isoetes setacea, I. palustris and Subularia aquatica), elodeids (Myriophyllum alterniflorum, Potamogeton alpinus and P. berchtoldii) and the helophyte (C. rostrata). Sampling was carried out during the ice-free period (June-November) of 2013 and 2014, with a total of 30 sites and 226 samples analysed.