Journal of Marine Sciences ›› 2021, Vol. 39 ›› Issue (2): 21-32.DOI: 10.3969/j.issn.1001-909X.2021.02.003

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The structure of bacterial communities and its response to the sedimentary disturbance in the surface sediment of western Pacific polymetallic nodule area

WANG Yuanru1, CUI Hongpeng1, LI Jidong1, SUN Dong2,3, WANG Chunsheng2,3, YANG Juan*1   

  1. 1.School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China; 
    2.Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China; 
    3.Key Laboratory of Marine Ecosystem Dynamics, Ministry of Natural Resources, Hangzhou 310012, China
  • Online:2021-06-15 Published:2021-06-15

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Abstract: The bacterial community structure of six surface sediment samples which were collected during the 48th China Scientific Cruise in the west Pacific Ocean was analyzed by highthroughput sequencing method. A total of 253012 sequences are obtained, belonging to 41 phyla, 85 classes, 189 orders, 261 families and 322 genera, respectively. Among them, Proteobacteria is the dominant class, which includes three subclasses: γ, α and δ. Their richness account for 24.76%, 20.21% and 6.48% of the total OTU(operational taxonomic units) in the study area, respectively. In addition, Chloroflexi, Acidobacteria, Gemmatimonadetes, Planctomycetes, Actinobacteria, Bacteroidetes and Nitrospirae are also found popular with abundant bacterial genera and species in each category. There are 23 orders with sequence abundance over 1%. Among them, 6 families or 10 genera are the highest dominant groups. Functional genes related to iron and manganese metabolism account for 10.20%, such as Alteromonas (6.90%), Pseudoalteromonas (1.80%), Shewanella (1.00%) and etc. Other functional gene groups related to nitrogen and sulfur cycling are also found. The result of PICRUSt analysis show wide genetic diversity of bacteria involved in various metabolic processes, such as signal transduction mechanism, protein transport, carbon fixation pathways in prokaryotes, quorum sensing, energy conversion, amino acid and pyrimidine metabolism and etc. Compared with other sites, BC1826 site has lower bacterial diversity, but has higher gene abundance of two-component system. Combined with the frequency of grain size curve of each sedimentary analysis, the result speculate that the difference of microbial community structure between BC1826 site and other sites is related to sedimentary disturbance. Based on the comparison with previous reports, the bacterial community structure in the western Pacific seamount area is different from that in the nodule areas of the eastern Pacific area.

Key words: deep-sea sediments, bacterial diversity, western Pacific Ocean, polymetallic nodule

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