Journal
EXTREMOPHILES
Volume 13, Issue 3, Pages 447-459Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s00792-009-0230-x
Keywords
Hot spring; Great Basin; Nitrosocaldus; Thermodynamic modelling; Thermophiles
Categories
Funding
- NATIONAL CENTER FOR RESEARCH RESOURCES [P41RR001646, P20RR016464] Funding Source: NIH RePORTER
- NCRR NIH HHS [P20 RR01646, P20 RR16464] Funding Source: Medline
Ask authors/readers for more resources
A coordinated study of water chemistry, sediment mineralogy, and sediment microbial community was conducted on four > 73A degrees C springs in the northwestern Great Basin. Despite generally similar chemistry and mineralogy, springs with short residence time (similar to 5-20 min) were rich in reduced chemistry, whereas springs with long residence time (> 1 day) accumulated oxygen and oxidized nitrogen species. The presence of oxygen suggested that aerobic metabolisms prevail in the water and surface sediment. However, Gibbs free energy calculations using empirical chemistry data suggested that several inorganic electron donors were similarly favorable. Analysis of 298 bacterial 16S rDNAs identified 36 species-level phylotypes, 14 of which failed to affiliate with cultivated phyla. Highly represented phylotypes included Thermus, Thermotoga, a member of candidate phylum OP1, and two deeply branching Chloroflexi. The 276 archaeal 16S rDNAs represented 28 phylotypes, most of which were Crenarchaeota unrelated to the Thermoprotei. The most abundant archaeal phylotype was closely related to Candidatus Nitrosocaldus yellowstonii, suggesting a role for ammonia oxidation in primary production; however, few other phylotypes could be linked with energy calculations because phylotypes were either related to chemoorganotrophs or were unrelated to known organisms.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available