Abstract
Bacteria in the surface sediments of a subtropical mangrove habitat were investigated using a cultivation-independent molecular approach. Phylogenetic analysis of nearly full-length 16S rRNA genes revealed a diversity of sequences that were mostly novel. Members from the five subdivisions of the Proteobacteria were detected, and they collectively represented the majority (67%) of the clone library. Sequence types affiliated with the Gammaproteobacteria constituted the largest portion (29%) of the library, and many of them were related to free-living and symbiotic sulfur-oxidizing bacteria. The Epsilonproteobacteria were the second most abundant group (16%), including only one sequence type clustering with PCR-generated bacterial clones previously recovered from deep-sea sediments. A substantial portion (8%) of the clones grouped within the Deltaproteobacteria, a subdivision with anaerobic sulfate or metal reduction as the predominant metabolic trait of its members. In addition, minor portions were affiliated with the Cytophaga–Flexibacter–Bacteroides group (9%), Actinobacteria (6%), Chloroflexi (5%), Firmicutes (4%), Fusobacteria (1%), and the Chlamydiae/Verrucomicrobia group, Fibrobacteres/Acidobacteria group and Planctomycetes (each < 1%). These results significantly expand our knowledge of the bacterial diversity of the unique mangrove environment.
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Acknowledgments
We would like to thank the Futian-City University Mangrove Research & Development Center for their support in conducting field sampling. The work described in this paper was supported by a grant from the City University of Hong Kong (Project No. 7001690).
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Communicated by O. Kinne, Oldendorf/Luhe
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Liang, JB., Chen, YQ., Lan, CY. et al. Recovery of novel bacterial diversity from mangrove sediment. Mar Biol 150, 739–747 (2007). https://doi.org/10.1007/s00227-006-0377-2
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DOI: https://doi.org/10.1007/s00227-006-0377-2