Zufiaurre, AitziberFelip i Benach, MarisolCamarero, LluísSala-Faig, MarcJuhanson, JaanisBonilla-Rosso, GermanHallin, SaraCatalan, Jordi2023-01-302023-01-302022-09-141664-302Xhttps://hdl.handle.net/2445/192790Due to global warming, shorter ice cover duration might drastically affect the ecology of lakes currently undergoing seasonal surface freezing. Highmountain lakes show snow-rich ice covers that determine contrasting conditions between ice-off and ice-on periods. We characterized the bacterioplankton seasonality in a deep high-mountain lake ice-covered for half a year. The lake shows a rich core bacterioplankton community consisting of three components: (i) an assemblage stable throughout the year, dominated by Actinobacteria, resistant to all environmental conditions; (ii) an ice-on-resilient assemblage dominating during the ice-covered period, which is more diverse than the other components and includes a high abundance of Verrucomicrobia; the deep hypolimnion constitutes a refuge for many of the typical under-ice taxa, many of which recover quickly during autumn mixing; and (iii) an ice-off-resilient assemblage, which members peak in summer in epilimnetic waters when the rest decline, characterized by a dominance of Flavobacterium, and Limnohabitans. The rich core community and low random elements compared to other relatively small cold lakes can be attributed to its simple hydrological network in a poorly-vegetated catchment, the long water-residence time (ca. 4 years), and the long ice-cover duration; features common to many headwater deep high-mountain lakes.14 p.application/pdfengcc-by (c) Zufiaurre, Aitziber et al., 2022https://creativecommons.org/licenses/by/4.0/PlànctonEcologiaBacterisPlanktonEcologyBacteriainfo:eu-repo/semantics/article7285672023-01-30info:eu-repo/semantics/openAccess