Diversity of phototrophic bacteria in microbial mats from Arctic hot springs (Greenland)

We investigated the genotypic diversity of oxygenic and anoxygenic phototrophic microorganisms in microbial mat samples collected from three hot spring localities on the east coast of Greenland. These hot springs harbour unique Arctic microbial ecosystems that have never been studied in detail befor...

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Bibliographic Details
Published in:Environmental Microbiology
Main Authors: Roeselers, G, Norris, TB, Castenholz, RW, Rysgaard, S, Glud, Ronnie, Kuhl, M, Muyzer, G
Format: Article in Journal/Newspaper
Language:English
Published: 2007
Subjects:
COMMUNITIES
CYANOBACTERIA
POPULATIONS
MOLECULAR APPROACH
Microbiology
SULFIDE
RADIATION
TEMPERATURE
CHLOROFLEXUS
ANTARCTIC LAKE ICE
GRADIENT GEL-ELECTROPHORESIS
Antarctic
Arctic
Greenland
Antarc*
Online Access:https://pure.uhi.ac.uk/en/publications/79bd45c8-e549-450d-b15c-a072059bfc30
https://doi.org/10.1111/j.1462-2920.2006.01103.x
Description
Summary:We investigated the genotypic diversity of oxygenic and anoxygenic phototrophic microorganisms in microbial mat samples collected from three hot spring localities on the east coast of Greenland. These hot springs harbour unique Arctic microbial ecosystems that have never been studied in detail before. Specific oligonucleotide primers for cyanobacteria, purple sulfur bacteria, green sulfur bacteria and Choroflexus/Roseiflexus-like green non-sulfur bacteria were used for the selective amplification of 16S rRNA gene fragments. Amplification products were separated by denaturing gradient gel electrophoresis (DGGE) and sequenced. In addition, several cyanobacteria were isolated from the mat samples, and classified morphologically and by 16S rRNA-based methods. The cyanobacterial 16S rRNA sequences obtained from DGGE represented a diverse, polyphyletic collection of cyanobacteria. The microbial mat communities were dominated by heterocystous and non-heterocystous filamentous cyanobacteria. Our results indicate that the cyanobacterial community composition in the samples were different for each sampling site. Different layers of the same heterogeneous mat often contained distinct and different communities of cyanobacteria. We observed a relationship between the cyanobacterial community composition and the in situ temperatures of different mat parts. The Greenland mats exhibited a low diversity of anoxygenic phototrophs as compared with other hot spring mats which is possibly related to the photochemical conditions within the mats resulting from the Arctic light regime.

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