Microbial community composition and diversity in Caspian Sea sediments

FEMS Microbiology Ecology
Nagissa MahmoudiTerry C Hazen

Abstract

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.

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Citations

Dec 25, 2015·Environmental Science & Technology·Terry C HazenNagissa Mahmoudi
Jun 9, 2016·Journal of Environmental Sciences (China)·Yan ZhangDonghui Wen
Sep 14, 2016·Bioresource Technology·Qing ZhaoZhiyong Jason Ren
Apr 4, 2017·Environmental Microbiology·Nagissa MahmoudiAnn Pearson
Apr 27, 2018·Environmental Microbiology·Stefan SpringHans-Peter Klenk
Jul 19, 2019·Global Change Biology·Ashley N BulsecoJennifer L Bowen
May 16, 2017·Frontiers in Microbiology·Marion H StagarsKatrin Knittel
Oct 14, 2017·FEMS Microbiology Ecology·Stephen M TechtmanTerry C Hazen
Jul 20, 2017·Scientific Reports·Jiang LiuTerry C Hazen
May 31, 2019·Frontiers in Microbiology·John I MillerTerry C Hazen
Jan 18, 2020·Antonie van Leeuwenhoek·Luciano Lopes QueirozVivian Helena Pellizari

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Datasets Mentioned

BETA
PRJNA261725

Methods Mentioned

BETA
column chromatography
PCR
amplicon sequencing

Software Mentioned

FastTree
libraries fastq
QIIME
ADONIS
PyNAST
vegan
NMDS
Phyloseq
R
split

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