Correlating microbial community profiles with geochemical data in highly stratified sediments from the Arctic Mid-Ocean Ridge.

摘要: Microbial communities and their associated metabolic activity in marine sediments have a profound impact on global biogeochemical cycles. Their composition structure are attributed to geochemical physical factors, but finding direct correlations has remained challenge. Here we show significant statistical relationship between variation prokaryotic community within deep-sea sediments. We obtained comprehensive data from two gravity cores near the hydrothermal vent field Loki’s Castle at Arctic Mid-Ocean Ridge, Norwegian-Greenland Sea. Geochemical properties rift valley exhibited strong centimeter-scale stratigraphic variability. populations were profiled by pyrosequencing 15 sediment horizons (59,364 16S rRNA gene tags), quantitatively assessed qPCR, phylogenetically analyzed. Although same taxa generally present all samples, relative abundances varied substantially among fluctuated Bacteria- Archaea-dominated communities. By independently summarizing covariance structures of abundance data, using principal components analysis, found correlation changes structure. Differences organic carbon mineralogy shaped microbial taxa. used build hypotheses about energy metabolisms, particularly Deep Sea Archaeal Group, specific Deltaproteobacteria, lineages potentially anaerobic Marine Group I Archaea. demonstrate that total can be directly correlated geochemistry these sediments, thus enhancing our understanding cycling ability predict metabolisms uncultured microbes