Structural and functional diversity of free-living microorganisms in reef surface, Kra island, Thailand

BMC Genomics

Research Article

Somchai Monanunsap¹  Naraporn Somboonna²  Anunchai Assawamakin³  Sithichoke Tangphatsornruang⁴  Duangjai Sangsrakru⁴  Alisa Wilantho⁴  Sissades Tongsima⁴ 

[1] Department of Marine and Coastal Resources, Ministry of Natural Resources and Environment, 10400, Bangkok, Thailand;Department of Microbiology, Faculty of Science, Chulalongkorn University, 10330, Bangkok, Thailand;Department of Pharmacology, Faculty of Pharmacy, Mahidol University, 10400, Bangkok, Thailand;Genome Institute, National Center for Genetic Engineering and Biotechnology, Khlong Nueng, Khlong Luang, 12120, Pathum thani, Thailand;

关键词: Biodiversity;    Prokaryote;    Eukaryote;    16S ribosomal RNA;    18S ribosomal RNA;    Reef surface;    Pyrosequencing;   

DOI  :  10.1186/1471-2164-15-607

 received in 2013-06-14, accepted in 2014-05-30,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundCoral reefs worldwide are being harmed through anthropogenic activities. Some coral reefs in Thailand remain well-preserved, including the shallow coral reefs along Kra island, Nakhon Si Thammarat province. Interestingly, the microbial community in this environment remains unknown. The present study identified biodiversity of prokaryotes and eukaryotes of 0.22-30 μm in sizes and their metabolic potentials in this coral reef surface in summer and winter seasons, using 16S and 18S rRNA genes pyrosequencing.ResultsThe marine microbial profiles in summer and winter seasons comprised mainly of bacteria, in phylum, particular the Proteobacteria. Yet, different bacterial and eukaryotic structures existed between summer and winter seasons, supported by low Lennon and Yue & Clayton theta similarity indices (8.48-10.43% for 16S rRNA, 0.32-7.81% for 18S rRNA ). The topmost prokaryotic phylum for the summer was Proteobacteria (99.68%), while for the winter Proteobacteria (62.49%) and Bacteroidetes (35.88%) were the most prevalent. Uncultured bacteria in phyla Cyanobacteria, Planctomycetes, SAR406 and SBR1093 were absent in the summer. For eukaryotic profiles, species belonging to animals predominated in the summer, correlating with high animal activities in the summer, whereas dormancy and sporulation predominated in the winter. For the winter, eukaryotic plant species predominated and several diverse species were detected. Moreover, comparison of our prokaryotic databases in summer and winter of Kra reef surface against worldwide marine culture-independent prokaryotic databases indicated our databases to most resemblance those of coastal Sichang island, Chonburi province, Thailand, and the 3 tropical GOS sites close to Galapagos island (GS039, GS040 and GS045), in orderly.ConclusionsThe study investigated and obtained culture-independent databases for marine prokaryotes and eukaryotes in summer and winter seasons of Kra reef surface. The data helped understand seasonal dynamics of microbial structures and metabolic potentials of this tropical ecosystem, supporting the knowledge of the world marine microbial biodiversity.

【 授权许可】

CC BY   
© Somboonna et al.; licensee BioMed Central Ltd. 2014