Environmental factors shape the culturable bacterial diversity in deep-sea water and surface sediments from the Mariana Trench
MA, Y.; DING, W.; WANG, Y.; CHEN, P.; ZHOU, H.; LI, X.; HUANG, Y.; NAN, P.
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Hailed as "The Fourth Pole", the Mariana Trench is the deepest part of the ocean. The microbial diversity in it is extremely complicated, which might be caused by the unique environmental factors such as high salinity, low temperature, high hydrostatic pressure, and limited nutrition. Based on 4 seawater samples and 4 sediment samples obtained from the Mariana Trench, we isolated and fostered the microorganism clones with kinds of culture mediums and high-throughput culturing. By using the molecular identification methods based on PCR of 16S rDNA and ITS gene, 1266 bacterial strains in total were isolated and identified, which affiliated to 7 classes, 16 orders, 25 families and 36 genera in four phyla : Proteobacteria, Firmicutes, Actinobacteria and Bacteroidetes. Strains in genera Halomonas, Pseudoaltermonas were the dominant bacteria isolated from the samples. With Mantel tests on the sample-environmental parameter matrix, the sample-environmental organic matter diversity matrix and the sample-microbial diversity matrix, we concluded that the environmental parameters and the organic matters in the condition can shape the culturable bacterial diversity in deep-sea water and surface sediments from the Mariana Trench.
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