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Microbial community composition and diversity in Caspian Sea sediments

Journal Article · · FEMS Microbiology Ecology (Online)
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [6];  [7]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Civil and Environmental Engineering; Univ. of Tennessee, Knoxville, TN (United States). Center for Environmental Biotechnology; DOE/OSTI
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioSciences Division
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Civil and Environmental Engineering; Univ. of Tennessee, Knoxville, TN (United States). Center for Environmental Biotechnology
  5. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Earth and Planetary Sciences
  6. Univ. of Tennessee, Knoxville, TN (United States). Center for Environmental Biotechnology
  7. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Civil and Environmental Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). BioSciences Division; Univ. of Tennessee, Knoxville, TN (United States). Center for Environmental Biotechnology; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Earth and Planetary Sciences; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Microbiology

The Caspian Sea is heavily polluted due to industrial and agricultural effluents as well as extraction of oil and gas reserves. Microbial communities can influence the fate of contaminants and nutrients. However, insight into the microbial ecology of the Caspian Sea significantly lags behind other marine systems. Here we describe microbial biomass, diversity and composition in sediments collected from three sampling stations in the Caspian Sea. Illumina sequencing of 16S rRNA genes revealed the presence of a number of known bacterial and archaeal heterotrophs suggesting that organic carbon is a primary factor shaping microbial communities. Surface sediments collected from bottom waters with low oxygen levels were dominated by Gammaproteobacteria while surface sediments collected from bottom waters under hypoxic conditions were dominated by Deltaproteobacteria, specifically sulfate-reducing bacteria. Thaumarchaeota was dominant across all surface sediments indicating that nitrogen cycling in this system is strongly influenced by ammonia-oxidizing archaea. This study provides a baseline assessment that may serve as a point of reference as this system changes or as the efficacy of new remediation efforts are implemented.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC); University of Tennessee; BP America
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1625318
Journal Information:
FEMS Microbiology Ecology (Online), Journal Name: FEMS Microbiology Ecology (Online) Journal Issue: 1 Vol. 91; ISSN 1574-6941
Publisher:
Federation of European Microbiological SocietiesCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (20)

Stimulation of carbon nanomaterials on syntrophic oxidation of butyrate in sediment enrichments and a defined coculture journal August 2018
Faecal pollution affects abundance and diversity of aquatic microbial community in anthropo-zoogenically influenced lotic ecosystems journal December 2019
Comparison of Thaumarchaeotal populations from four deep sea basins journal October 2017
Aquatic microbial diversity associated with faecal pollution of Norwegian waterbodies characterized by 16S rRNA gene amplicon deep sequencing journal July 2019
Dynamics of Sulfate-Reducing Bacteria Community Structure in Surface Sediment of a Seasonally Hypoxic Enclosed Bay journal January 2018
Sulfur-Oxidizing Bacteria Mediate Microbial Community Succession and Element Cycling in Launched Marine Sediment journal February 2017
Microbial Diversity and Community Structure of Sulfate-Reducing and Sulfur-Oxidizing Bacteria in Sediment Cores from the East China Sea journal November 2017
Temperature Driven Changes in Benthic Bacterial Diversity Influences Biogeochemical Cycling in Coastal Sediments journal August 2018
Effect of freshwater mussels on the vertical distribution of anaerobic ammonia oxidizers and other nitrogen-transforming microorganisms in upper Mississippi river sediment journal July 2017
Bacterial diversity in deep-sea sediments under influence of asphalt seep at the São Paulo Plateau journal January 2020
Microbial diversity of sediments from an inactive hydrothermal vent field, Southwest Indian Ridge journal October 2019
Archaeal communities in sponge, sediment and water from marine lakes and open water habitats journal March 2019
Bacterial diversity in deep-sea sediments under influence of asphalt seep at the São Paulo Plateau posted_content December 2019
Sequential bioavailability of sedimentary organic matter to heterotrophic bacteria: Sequential bioavailability of sedimentary organic matter journal May 2017
Genome biology of a novel lineage of planctomycetes widespread in anoxic aquatic environments journal July 2018
Nitrate addition stimulates microbial decomposition of organic matter in salt marsh sediments journal July 2019
Microcosm evaluation of the impact of oil contamination and chemical dispersant addition on bacterial communities and sediment remediation of an estuarine port environment journal March 2019
Hydrocarbon Degradation in Caspian Sea Sediment Cores Subjected to Simulated Petroleum Seepage in a Newly Designed Sediment-Oil-Flow-Through System journal April 2017
Microbial Community Response to Simulated Petroleum Seepage in Caspian Sea Sediments journal April 2017
Oil Hydrocarbon Degradation by Caspian Sea Microbial Communities journal May 2019

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