Benthic Biofilms in Glacier-Fed Streams from Scandinavia to the Himalayas Host Distinct Bacterial Communities Compared with the Streamwater
| العنوان: | Benthic Biofilms in Glacier-Fed Streams from Scandinavia to the Himalayas Host Distinct Bacterial Communities Compared with the Streamwater |
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| المؤلفون: | Leïla Ezzat, Stilianos Fodelianakis, Tyler J. Kohler, Massimo Bourquin, Jade Brandani, Susheel Bhanu Busi, Daniele Daffonchio, Vincent De Staercke, Ramona Marasco, Grégoire Michoud, Emmy Oppliger, Hannes Peter, Paraskevi Pramateftaki, Martina Schön, Michail Styllas, Virginia Tadei, Matteo Tolosano, Tom J. Battin |
| المصدر: | Appl Environ Microbiol |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Ecology, Bacteria, Microbiota, fungi, benthic biofilms, microbial communities, habitat, Water, Biodiversity, biochemical phenomena, metabolism, and nutrition, Applied Microbiology and Biotechnology, glacier-fed streams, Rivers, biogeochemistry, Biofilms, RNA, Ribosomal, 16S, Environmental Microbiology, community assembly, Humans, Ice Cover, community composition, geographic locations, Ecosystem, Food Science, Biotechnology |
| الوصف: | Microbial life in glacier-fed streams (GFSs) is dominated by benthic biofilms which fulfill critical ecosystem processes. However, it remains unclear how the bacterial communities of these biofilms assemble in stream ecosystems characterized by rapid turnover of benthic habitats and high suspended sediment loads. Using16S rRNA gene amplicon sequence data collected from 54 GFSs across the Himalayas, European Alps, and Scandinavian Mountains, we found that benthic biofilms harbor bacterial communities that are distinct from the bacterial assemblages suspended in the streamwater. Our data showed a decrease in species richness in the benthic biofilms compared to the bacterial cells putatively free-living in the water. The benthic biofilms also differed from the suspended water fractions in terms of community composition. Differential abundance analyses highlighted bacterial families that were specific to the benthic biofilms and the suspended assemblages. Notably, source-sink models suggested that the benthic biofilm communities are not simply a subset of the suspended assemblages. Rather, we found evidence that deterministic processes (e.g., species sorting) shape the benthic biofilm communities. This is unexpected given the high vertical mixing of water and contained bacterial cells in GFSs and further highlights the benthic biofilm mode of life as one that is determined through niche-related processes. Our findings therefore reveal a "native" benthic biofilm community in an ecosystem that is currently threatened by climate-induced glacier shrinkage. IMPORTANCE Benthic biofilms represent the dominant form of life in glacier-fed streams. However, it remains unclear how bacterial communities within these biofilms assemble. Our findings from glacier-fed streams from three major mountain ranges across the Himalayas, the European Alps and the Scandinavian Mountains reveal a bacterial community associated with benthic biofilms that is distinct from the assemblage in the overlying streamwater. Our analyses suggest that selection is the underlying process to this differentiation. This is unexpected given that bacterial cells that are freely living or attached to the abundant sediment particles suspended in the water continuously mix with the benthic biofilms. The latter colonize loose sediments that are subject to high turnover owing to the forces of the water flow. Our research unravels the existence of a microbiome specific to benthic biofilms in glacier-fed streams, now under major threats due to global warming. Benthic biofilms represent the dominant form of life in glacier-fed streams. However, it remains unclear how bacterial communities within these biofilms assemble. |
| تدمد: | 1098-5336 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d6ccb609cc7682fbc6f82ee1a4ccbb3b https://pubmed.ncbi.nlm.nih.gov/35674429 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....d6ccb609cc7682fbc6f82ee1a4ccbb3b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10985336 |
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