cyanobacteria; Biological Soil Crusts; Antarctica; Biodiversity; Open Top Chambers
Abstract :
[en] Molecular and morphological methods were applied to study cyanobacterial community composition in biological soil crusts (BSCs) from four areas (two nunataks and two ridges) in the Sør Rondane Mountains, Antarctica. The sampling sites serve as control areas for open top chambers (OTCs) which were placed in 2010 at the time of sample collection and will be compared with BSC samples taken from the OTCs in future. Cyanobacterial cell biovolume was estimated using epifluorescence microscopy, which revealed the dominance of filamentous cyanobacteria in all studied sites except the Utsteinen ridge, where unicellular cyanobacteria were the most abundant. Cyanobacterial diversity was studied by a combination of molecular fingerprinting methods based on the 16S rRNA gene (denaturing gradient gel electrophoresis (DGGE) and 454 pyrosequencing) using cyanobacteria specific primers. The number of DGGE sequences obtained per site was variable and, therefore, a high-throughput method was later employed to improve the diversity coverage. Consistent with previous surveys in Antarctica, both methods showed that filamentous cyanobacteria such as Leptolyngbya sp., Phormidium sp. and Microcoleus sp. were dominant in the studied sites.
In addition, the studied localities differed in substrate type, climatic conditions and soil parameters, which likely resulted in differences in cyanobacterial community composition. Furthermore, the BSC growing on gneiss pebbles had lower cyanobacterial abundances than BSCs associated to granitic substrates.
Research center :
CIP - Centre d'Ingénierie des Protéines - ULiège
Disciplines :
Microbiology
Author, co-author :
Pushkareva, Ekaterina
Pessi, Igor S
Namsaraev, Zorigto
Mano, Marie-José
Elster, Josef
Wilmotte, Annick ; Université de Liège - ULiège > Département des sciences de la vie > Physiologie et génétique bactériennes
Language :
English
Title :
Cyanobacteria inhabiting biological soil crusts of a polar desert: Sør Rondane Mountains, Antarctica
Alternative titles :
[en] Les cyanobactéries habitant les croutes biotiques d'un désert polaire
BELSPO - Service Public Fédéral de Programmation Politique scientifique [BE] F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] Ministry of Education, Youth and Sports of the Czech Republic (CzechPolar LM2010009 and RVO67985939)
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