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ABSTRACT: Exploring microbial life in the Antarctica Dry Valley lakes

PROVIDER: PRJEB20869 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR1980760.fastq.gz	Fastqsanger.gz
	ERR1980770.fastq.gz	Fastqsanger.gz
	ERR1980780.fastq.gz	Fastqsanger.gz
	ERR1980790.fastq.gz	Fastqsanger.gz
	ERR1980800.fastq.gz	Fastqsanger.gz

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Plant and bird presence strongly influences the microbial communities in soils of Admiralty Bay, Maritime Antarctica

Project description:Understanding the environmental factors that shape microbial communities is crucial, especially in extreme environments, like Antarctica. Two main forces were reported to influence Antarctic soil microbes: birds and plants. Both birds and plants are currently undergoing unprecedented changes in their distribution and abundance due to global warming. However, we need to clearly understand the relationship between plants, birds and soil microorganisms. We therefore collected rhizosphere and bulk soils from six different sampling sites subjected to different levels of bird influence and colonized by Colobanthus quitensis and Deschampsia antarctica in the Admiralty Bay, King George Island, Maritime Antarctic. Microarray and qPCR assays targeting 16S rRNA genes of specific taxa were used to assess microbial community structure, composition and abundance and analyzed with a range of soil physico-chemical parameters. The results indicated significant rhizosphere effects in four out of the six sites, including areas with different levels of bird influence. Acidobacteria were significantly more abundant in soils with little bird influence (low nitrogen) and in bulk soil. In contrast, Actinobacteria were significantly more abundant in the rhizosphere of both plant species. At two of the sampling sites under strong bird influence (penguin colonies), Firmicutes were significantly more abundant in D. antarctica rhizosphere but not in C. quitensis rhizosphere. The Firmicutes were also positively and significantly correlated to the nitrogen concentrations in the soil. We conclude that the microbial communities in Antarctic soils are driven both by bird and plants, and that the effect is taxa-specific.

2012-06-01 | GSE33847 | GEO

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