Extremophiles

, Volume 16, Issue 4, pp 669–679

Biogeography of bacterial communities in hot springs: a focus on the actinobacteria

Original Paper

DOI: 10.1007/s00792-012-0465-9

Cite this article as:
Valverde, A., Tuffin, M. & Cowan, D.A. Extremophiles (2012) 16: 669. doi:10.1007/s00792-012-0465-9

Abstract

Actinobacteria are ubiquitous in soil, freshwater and marine ecosystems. Although various studies have focused on the microbial ecology of this phylum, data are scant on the ecology of actinobacteria endemic to hot springs. Here, we have investigated the molecular diversity of eubacteria, with specific focus on the actinobacteria in hot springs in Zambia, China, New Zealand and Kenya. Temperature and pH values at sampling sites ranged between 44.5 and 86.5 °C and 5–10, respectively. Non-metric multidimensional scaling analysis of 16S rRNA gene T-RFLP patterns showed that samples could be separated by geographical location. Multivariate analysis showed that actinobacterial community composition was best predicted by changes in pH and temperature, whereas temperature alone was the most important variable explaining differences in bacterial community structure. Using 16S rRNA gene libraries, 28 major actinobacterial OTUs were found. Both molecular techniques indicated that many of the actinobacterial phylotypes were unique and exclusive to the respective sample. Collectively, these results support the view that both actinobacterial diversity and endemism are high in hot spring ecosystems.

Keywords

Actinobacteria Bacteria Biogeography Endemism Diversity Hot springs 

Supplementary material

792_2012_465_MOESM1_ESM.pdf (172 kb)
Supplementary Figures (PDF 173 kb)

Copyright information

© Springer 2012

Authors and Affiliations

  1. 1.Institute for Microbial Biotechnology and MetagenomicsUniversity of the Western CapeCape TownSouth Africa
  2. 2.University of PretoriaPretoriaSouth Africa