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Research article - Peer-reviewed, 2022

Bacterioplankton seasonality in deep high-mountain lakes

Zufiaurre, Aitziber; Felip, Marisol; Camarero, Lluis; Sala-Faig, Marc; Juhanson, Jaanis; Bonilla-Rosso, German; Hallin, Sara; Catalan, Jordi;

Abstract

Due to global warming, shorter ice cover duration might drastically affect the ecology of lakes currently undergoing seasonal surface freezing. High-mountain 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.

Keywords

microbial ecology; under-ice ecology; bacteria coexistence; core community; Actinobacteria hgcl_clade; Verrucomicrobia; Flavobacterium; Limnohabitans

Published in

Frontiers in Microbiology

2022, volume: 13, article number: 935378
Publisher: FRONTIERS MEDIA SA

Authors' information

Zufiaurre, Aitziber
Centro de Investigacion Ecologica y Aplicaciones Forestales (CREAF)
Felip, Marisol
Centro de Investigacion Ecologica y Aplicaciones Forestales (CREAF)
Felip, Marisol
University of Barcelona
Camarero, Lluis
CSIC - Centre d'Estudis Avancats de Blanes (CEAB)
Sala-Faig, Marc
Centro de Investigacion Ecologica y Aplicaciones Forestales (CREAF)
Swedish University of Agricultural Sciences, Department of Forest Mycology and Plant Pathology
Bonilla Rosso, German
Swedish University of Agricultural Sciences, Department of Forest Mycology and Plant Pathology
Bonilla-Rosso, German (Bonilla-Rosso, German)
University of Lausanne
Swedish University of Agricultural Sciences, Department of Forest Mycology and Plant Pathology
Catalan, Jordi
Centro de Investigacion Ecologica y Aplicaciones Forestales (CREAF)
Catalan, Jordi
Consejo Superior de Investigaciones Cientificas (CSIC)

UKÄ Subject classification

Physical Geography
Microbiology

Publication Identifiers

DOI: https://doi.org/10.3389/fmicb.2022.935378

URI (permanent link to this page)

https://res.slu.se/id/publ/119270