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首页> 中文期刊> 《极地科学进展：英文版》 >Spatial heterogeneity of a microbial community in Kongsfjorden,Svalbard during late summer 2006 and its relationship to biotic and abiotic factors

Spatial heterogeneity of a microbial community in Kongsfjorden,Svalbard during late summer 2006 and its relationship to biotic and abiotic factors

         
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摘要

The 16S and 18S ribosomal ribonucleic acid genes of microbial organisms collected from the contrasting environments (temperature,salinity,silicate,phosphate and nitrate,p <0.05) of the inner and outer basins of Kongsfjorden (Spitsbergen,Arctic) were studied using polymerase chain reaction-denaturing gradient gel electrophoresis(DGGE) fingerprinting.Comparison of the microbial fingerprints and the physicochemical parameters revealed that molecular methodology exhibited a greater sensitivity.Sequences obtained from bacterial DGGE were affiliated with four main phylogenetic groups of bacteria:Proteobacteria(Alpha,Beta and Gamma),Bacteroidetes,Verrucomicrobia and Cyanobacteria.The relationships between the genotype distribution of these microbes and associated biotic/abiotic factors,revealed by canonical correspondence analysis,showed that Station 1 at 30 m (outer fjord) was grouped separately from the other sites.This difference could be a consequence of the thermocline and base of the euphotic layer at this depth where the Atlantic and Arctic-type waters overlapped.

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