The perennially ice-covered Lake Enigma, Antarctica supports unique microbial communities

IF 8.1 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Francesco Smedile, Violetta La Cono, Stefano Urbini, Giovanni Benedetti, Gina La Spada, Francesca Crisafi, Maurizio Azzaro, Nunziatina Porcino, Stefano Fazi, Stefano Amalfitano, Franco Tassi, Orlando Vaselli, Stefania Venturi, Michael T. Madigan, John E. Hallsworth, Michail M. Yakimov
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Abstract

Northern Foothills of Victoria Land, Antarctica contains numerous hydrological formations, ranging from small surface streams and ponds fed by glacial or snow meltwater to permafrost lakes containing briny pockets. Here we describe the discovery of a massive body of unfrozen stratified oligotrophic water in Lake Enigma, a permanently ice-covered lake previously thought to be frozen from top to bottom. A remarkable feature of the Lake Enigma microbial ecosystem is the presence, and sometimes even dominance, of ultrasmall bacteria belonging to the superphylum Patescibacteria, a group apparently absent from Antarctic lakes in the well-studied McMurdo Dry Valleys. Cyanobacteria are virtually absent from Lake Enigma ice and water column although they are well represented in its extensive and diverse benthic microbial mats. Collectively, these features reveal a new complexity in Antarctic lake food webs and demonstrate that in addition to phototrophic and simple chemotrophic metabolisms, both symbiotic and predatory lifestyles may exist. Unfrozen water in the perennially ice-covered Lake Enigma, Antarctica supports microbial communities distinct from those in other Antarctic lakes according to analyses of the lake’s physical structure, geochemistry, hydrological history, and microbiota.

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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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