Coastal Bacterial Community Response to Glacier Melting in the Western Antarctic Peninsula
| Autor: | Laura Farías, Jerónimo Cifuentes-Anticevic, Sebastián Fuentes-Alburquenque, Martin F. Polz, María E. Alcamán-Arias, Josefa Verdugo, Beatriz Díez, Carlos Pedrós-Alió, Pablo Vergara-Barros |
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| Přispěvatelé: | Agencia Nacional de Investigación y Desarrollo (Chile), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile), Ministerio de Economía y Competitividad (España), Instituto Antártico Chileno |
| Rok vydání: | 2021 |
| Předmět: |
Microbiology (medical)
010504 meteorology & atmospheric sciences 01 natural sciences Microbiology Article 03 medical and health sciences Virology Coastal Antarctic zone Marine ecosystem 14. Life underwater Transect lcsh:QH301-705.5 Polaromonas 030304 developmental biology 0105 earth and related environmental sciences 0303 health sciences geography geography.geographical_feature_category biology Glacial melting Glacier biology.organism_classification Salinity Oceanography Microbial population biology lcsh:Biology (General) 13. Climate action Environmental science Seawater Bacterial microbial community Bay |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Microorganisms, Vol 9, Iss 88, p 88 (2021) Microorganisms Volume 9 Issue 1 |
| Popis: | © 2021 by the authors. Current warming in the Western Antarctic Peninsula (WAP) has multiple effects on the marine ecosystem, modifying the trophic web and the nutrient regime. In this study, the effect of decreased surface salinity on the marine microbial community as a consequence of freshening from nearby glaciers was investigated in Chile Bay, Greenwich Island, WAP. In the summer of 2016, samples were collected from glacier ice and transects along the bay for 16S rRNA gene sequencing, while in situ dilution experiments were conducted and analyzed using 16S rRNA gene sequencing and metatranscriptomic analysis. The results reveal that certain common seawater genera, such as Polaribacter, Pseudoalteromonas and HTCC2207, responded positively to decreased salinity in both the bay transect and experiments. The relative abundance of these bacteria slightly decreased, but their functional activity was maintained and increased the over time in the dilution experiments. However, while ice bacteria, such as Flavobacterium and Polaromonas, tolerated the increased salinity after mixing with seawater, their gene expression decreased considerably. We suggest that these bacterial taxa could be defined as sentinels of freshening events in the Antarctic coastal system. Furthermore, these results suggest that a significant portion of the microbial community is resilient and can adapt to disturbances, such as freshening due to the warming effect of climate change in Antarctica. This work was financially supported by the Agencia Nacional de Investigación y Desarrollo de Chile (ANID/FONDAP/15110009; DPI, grant number DPI20140044-ANID; ANID/INACH/ FONDECYT 3170807), Spanish Ministry of Economy and Competitivity grant CTM2016-80095-C2, and the Instituto Antártico Chileno (grant numbers INACH RT_15-10, INACH RG_09-17 and INACH RT_04-19). |
| Databáze: | OpenAIRE |
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