Diversity and biogeography of the bacterial microbiome in glacier-fed streams

• 成果类型: Article
• 署名作者: Ezzat, Leila; Peter, Hannes; Bourquin, Massimo; Busi, Susheel Bhanu; Michoud, Gregoire; Fodelianakis, Stilianos; Kohler, Tyler J.; Lamy, Thomas; Geers, Aileen; Pramateftaki, Paraskevi; Baier, Florian; Marasco, Ramona; Daffonchio, Daniele; Deluigi, Nicola; Wilmes, Paul; Styllas, Michail; Schoen, Martina; Tolosano, Matteo; De Staercke, Vincent; Battin, Tom J.
• 署名单位: Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Universite de Montpellier; Ifremer; Institut de Recherche pour le Developpement (IRD); Centre National de la Recherche Scientifique (CNRS); UK Centre for Ecology & Hydrology (UKCEH); University of Luxembourg; Charles University Prague; King Abdullah University of Science & Technology; Universite Paris Cite
• 刊物名称: Nature
• ISSN/ISSBN: 0028-2788
• DOI: 10.1038/s41586-024-08313-z
• 发表日期: 2025-01-16
• 关键词: beta diversity; global patterns; biodiversity; redundancy; matrices; ecology; RIVERS

摘要

The rapid melting of mountain glaciers and the vanishing of their streams is emblematic of climate change1,2. Glacier-fed streams (GFSs) are cold, oligotrophic and unstable ecosystems in which life is dominated by microbial biofilms2,3. However, current knowledge on the GFS microbiome is scarce4,5, precluding an understanding of its response to glacier shrinkage. Here, by leveraging metabarcoding and metagenomics, we provide a comprehensive survey of bacteria in the benthic microbiome across 152 GFSs draining the Earth's major mountain ranges. We find that the GFS bacterial microbiome is taxonomically and functionally distinct from other cryospheric microbiomes. GFS bacteria are diverse, with more than half being specific to a given mountain range, some unique to single GFSs and a few cosmopolitan and abundant. We show how geographic isolation and environmental selection shape their biogeography, which is characterized by distinct compositional patterns between mountain ranges and hemispheres. Phylogenetic analyses furthermore uncovered microdiverse clades resulting from environmental selection, probably promoting functional resilience and contributing to GFS bacterial biodiversity and biogeography. Climate-induced glacier shrinkage puts this unique microbiome at risk. Our study provides a global reference for future climate-change microbiology studies on the vanishing GFS ecosystem.