Pubblicazione scientifica

Microbial Community Response to Simulated Petroleum Seepage in Caspian Sea Sediments

FILONE TECNOLOGICO	TEMA
trasformazione e commercializzazione

RIASSUNTO

Anaerobic microbial hydrocarbon degradation is a major biogeochemical process at marine seeps. Here we studied the response of the microbial community to petroleum seepage simulated for 190 days in a sediment core from the Caspian Sea using a sediment-oil-flow-through (SOFT) system. Untreated (without simulated petroleum seepage) and SOFT sediment microbial communities shared 43% bacterial genus-level 16S rRNA-based operational taxonomic units (OTU0.945) but shared only 23% archaeal OTU0.945. The community differed significantly between sediment layers. The detection of fourfold higher deltaproteobacterial cell numbers in SOFT than in untreated sediment at depths characterized by highest sulfate reduction rates and strongest decrease of gaseous and mid-chain alkane concentrations indicated a specific response of hydrocarbon-degrading Deltaproteobacteria. Based on an increase in specific CARD-FISH cell numbers, we suggest the following groups of sulfate-reducing bacteria to be likely responsible for the observed decrease in aliphatic and aromatic hydrocarbon concentration in SOFT sediments: clade SCA1 for propane and butane degradation, clade LCA2 for mid- to long-chain alkane degradation, clade Cyhx for cycloalkanes, pentane and hexane degradation, and relatives of Desulfobacula for toluene degradation. Highest numbers of archaea of the genus Methanosarcina were found in the methanogenic zone of the SOFT core where we detected preferential degradation of long-chain hydrocarbons. Sequencing of masD, a marker gene for alkane degradation encoding (1-methylalkyl)succinate synthase, revealed a low diversity in SOFT sediment with two abundant species-level MasD OTU0.96.

DATA

Data di pubblicazione: 28/04/2017

AUTORI

STAGARS MARION H
MISHRA SONAKSHI
TREUDE TINA
AMANN RUDOLF
KNITTEL KATRIN

ENTE DI AFFERENZA

DEPT MOLECULAR ECOLOGY MAX PLANCK INST MARINE MICROBIOLOGY BREMEN GERMANY
DEPARTMENT OF MARINE BIOGEOCHEMISTRY GEOMAR – HELMHOLTZ CENTRE FOR OCEAN RESEARCH KIEL KIEL GERMANY
DEPT EARTH PLANETARY & SPACE SCIENCES UNIV CALIFORNIA LOS ANGELES LOS ANGELES CA USA
DEPT ATMOSPHERIC & OCEANIC SCIENCES UNIV CALIFORNIA LOS ANGELES LOS ANGELES CA USA

RIVISTA

Frontiers in Microbiology, 8, 764

IMPACT FACTOR

4,190

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