Bacterial community composition in thermophilic microbial mats from five hot springs in central Tibet

Lau, Maggie CY, Aitchison, Jonathan C. and Pointing, Stephen B. (2009) Bacterial community composition in thermophilic microbial mats from five hot springs in central Tibet. Extremophiles, 13 1: 139-149. doi:10.1007/s00792-008-0205-3

Author Lau, Maggie CY
Aitchison, Jonathan C.
Pointing, Stephen B.
Title Bacterial community composition in thermophilic microbial mats from five hot springs in central Tibet
Journal name Extremophiles   Check publisher's open access policy
ISSN 1431-0651
Publication date 2009-01-01
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s00792-008-0205-3
Open Access Status Not yet assessed
Volume 13
Issue 1
Start page 139
End page 149
Total pages 11
Place of publication Tokyo, Japan
Publisher Springer Japan KK
Language eng
Formatted abstract
Despite detailed study of selected thermophilic taxa, overall community diversity of bacteria in thermophilic mats remains relatively poorly understood. A sequence-based survey of bacterial communities from several hot spring locations in central Tibet was undertaken. Diversity and frequency of occurrence for 140 unique 16S rRNA gene phylotypes were identified in clone libraries constructed from environmental samples. A lineage-per-time plot revealed that individual locations have evolved to support relatively large numbers of phylogenetically closely related phylotypes. Application of the F ST statistic and P test to community data was used to demonstrate that phylogenetic divergence between locations was significant, thus emphasizing the status of hot springs as isolated habitats. Among phylotypes, only the Chlorobi were ubiquitous to all mats, other phototrophs (Cyanobacteria and Chloroflexi) occurred in most but not all samples and generally accounted for a large number of recovered phylotypes. Phylogenetic analyses of phototrophic phylotypes revealed support for location-specific lineages. The alpha, beta and gamma proteobacteria were also frequently recovered phyla, suggesting they may be abundant phylotypes in mats, a hitherto unappreciated aspect of thermophilic mat biodiversity. Samples from one location indicated that where phototrophic bacteria were rare or absent due to niche disturbance, the relative frequency of proteobacterial phylotypes increased.
Keyword Chlorobi
Hot Springs
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID HKU 7573/05M
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
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Created: Wed, 29 Jul 2015, 21:19:38 EST by Helen Smith on behalf of School of Geography, Planning & Env Management