NDLI: Pond Sediment Magnetite Grains Show a Distinctive Microbial Community

Content Provider	Springer Nature Link
Author	Song, H. K. Sonkaria, S. Khare, V. Dong, K. Lee, H. T. Ahn, S. H. Kim, H. K. Kang, H. J. Lee, S. H. Jung, S. P. Adams, J. M.
Copyright Year	2015
Abstract	Formation of magnetite in anaerobic sediments is thought to be enhanced by the activities of iron-reducing bacteria. Geobacter has been implicated as playing a major role, as in culture its cells are often associated with extracellular magnetite grains. We studied the bacterial community associated with magnetite grains in sediment of a freshwater pond in South Korea. Magnetite was isolated from the sediment using a magnet. The magnetite-depleted fraction of sediment was also taken for comparison. DNA was extracted from each set of samples, followed by PCR for 16S bacterial ribosomal RNA (rRNA) gene and HiSeq sequencing. The bacterial communities of the magnetite-enriched and magnetite-depleted fractions were significantly different. The enrichment of three abundant operational taxonomic units (OTUs) suggests that they may either be dependent upon the magnetite grain environment or may be playing a role in magnetite formation. The most abundant OTU in magnetite-enriched fractions was Geobacter, bolstering the case that this genus is important in magnetite formation in natural systems. Other major OTUs strongly associated with the magnetite-enriched fraction, rather than the magnetite-depleted fraction, include a Sulfuricella and a novel member of the Betaproteobacteria. The existence of distinct bacterial communities associated with particular mineral grain types may also be an example of niche separation and coexistence in sediments and soils, which cannot usually be detected due to difficulties in separating and concentrating minerals.
Starting Page	168
Ending Page	174
Page Count	7
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	70
Issue Number	1
e-ISSN	1432184X
Language	English
Publisher	Springer US
Publisher Date	2015-01-16
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Geobacter Sulfuricella Magnetite Operational taxonomic units 16S bacterial ribosomal RNA Microbiology Ecology Microbial Ecology Geoecology/Natural Processes Nature Conservation Water Quality/Water Pollution
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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