底栖区
γ蛋白杆菌
海冰
海洋学
大陆架
微生物垫
微生物种群生物学
冰架
有机质
地质学
生态学
环境科学
冰层
生物
16S核糖体RNA
古生物学
细菌
蓝藻
作者
Marwa Baloza,Susann Henkel,Sabine Kasten,Moritz Holtappels,Massimiliano Molari
出处
期刊:Microorganisms
[MDPI AG]
日期:2023-06-14
卷期号:11 (6): 1572-1572
被引量:1
标识
DOI:10.3390/microorganisms11061572
摘要
The area around the Antarctic Peninsula (AP) is facing rapid climatic and environmental changes, with so far unknown impacts on the benthic microbial communities of the continental shelves. In this study, we investigated the impact of contrasting sea ice cover on microbial community compositions in surface sediments from five stations along the eastern shelf of the AP using 16S ribosomal RNA (rRNA) gene sequencing. Redox conditions in sediments with long ice-free periods are characterized by a prevailing ferruginous zone, whereas a comparatively broad upper oxic zone is present at the heavily ice-covered station. Low ice cover stations were highly dominated by microbial communities of Desulfobacterota (mostly Sva1033, Desulfobacteria, and Desulfobulbia), Myxococcota, and Sva0485, whereas Gammaproteobacteria, Alphaproteobacteria, Bacteroidota, and NB1-j prevail at the heavy ice cover station. In the ferruginous zone, Sva1033 was the dominant member of Desulfuromonadales for all stations and, along with eleven other taxa, showed significant positive correlations with dissolved Fe concentrations, suggesting a significant role in iron reduction or an ecological relationship with iron reducers. Our results indicate that sea ice cover and its effect on organic carbon fluxes are the major drivers for changes in benthic microbial communities, favoring potential iron reducers at stations with increased organic matter fluxes.
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