The Effect of Oxygen Depletion on Anaerobic Organic Matter Degradation in Marine Sediments

1999 ◽  
Vol 48 (3) ◽  
pp. 383-390 ◽  
Author(s):  
Marianne Holmer
Keyword(s):  
Organic Matter ◽  
Marine Sediments ◽  
Oxygen Depletion ◽  
Organic Matter Degradation ◽  
Effect Of Oxygen

Organic matter degradation characteristics of coastal marine sediments collected from the Seto Inland Sea, Japan

2020 ◽  
Vol 225 ◽  
pp. 103854 ◽  
Author(s):  
Satoshi Asaoka ◽  
Waqar Azeem Jadoon ◽  
Akira Umehara ◽  
Kazuhiko Takeda ◽  
Sosuke Otani ◽  
...  
Keyword(s):  
Organic Matter ◽  
Marine Sediments ◽  
Seto Inland Sea ◽  
Organic Matter Degradation ◽  
Coastal Marine Sediments ◽  
Coastal Marine ◽  
The Seto Inland Sea

scholarly journals Microbial Organic Matter Degradation Potential in Baltic Sea Sediments Is Influenced by Depositional Conditions andIn SituGeochemistry

2018 ◽  
Vol 85 (4) ◽  
Author(s):  
Laura A. Zinke ◽  
Clemens Glombitza ◽  
Jordan T. Bird ◽  
Hans Røy ◽  
Bo Barker Jørgensen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Baltic Sea ◽  
Microbial Communities ◽  
Carbon Cycling ◽  
Marine Sediments ◽  
Abiotic Factors ◽  
Organic Matter Degradation ◽  
Sediment Types ◽  
Polymer Hydrolysis ◽  
Sediment Carbon

ABSTRACTGlobally, marine sediments are a vast repository of organic matter, which is degraded through various microbial pathways, including polymer hydrolysis and monomer fermentation. The sources, abundances, and quality (i.e., labile or recalcitrant) of the organic matter and the composition of the microbial assemblages vary between sediments. Here, we examine new and previously published sediment metagenomes from the Baltic Sea and the nearby Kattegat region to determine connections between geochemistry and the community potential to degrade organic carbon. Diverse organic matter hydrolysis encoding genes were present in sediments between 0.25 and 67 meters below seafloor and were in higher relative abundances in those sediments that contained more organic matter. New analysis of previously published metatranscriptomes demonstrated that many of these genes were transcribed in two organic-rich Holocene sediments. Some of the variation in deduced pathways in the metagenomes correlated with carbon content and depositional conditions. Fermentation-related genes were found in all samples and encoded multiple fermentation pathways. Notably, genes involved in alcohol metabolism were amongst the most abundant of these genes, indicating that this is an important but underappreciated aspect of sediment carbon cycling. This study is a step towards a more complete understanding of microbial food webs and the impacts of depositional facies on present sedimentary microbial communities.IMPORTANCESediments sequester organic matter over geologic time scales and impact global climate regulation. Microbial communities in marine sediments drive organic matter degradation, but the factors controlling their assemblages and activities, which in turn impact their role in organic matter degradation, are not well understood. Hence, determining the role of microbial communities in carbon cycling in various sediment types is necessary for predicting future sediment carbon cycling. We examined microbial communities in Baltic Sea sediments, which were deposited across various climatic and geographical regimes to determine the relationship between microbial potential for breakdown of organic matter and abiotic factors, including geochemistry and sediment lithology. The findings from this study will contribute to our understanding of carbon cycling in the deep biosphere and how microbial communities live in deeply buried environments.

Erratum to ‘Control of sulphate and methane distributions in marine sediments by organic matter reactivity’ [Geochimica et Cosmochimica 104 (2013) 183–193]

2013 ◽  
Vol 113 ◽  
pp. 225-226 ◽  
Author(s):  
Patrick Meister ◽  
Bo Liu ◽  
Timothy G. Ferdelman ◽  
Bo Barker Jørgensen ◽  
Arzhang Khalili
Keyword(s):  
Organic Matter ◽  
Marine Sediments
Sign in / Sign up

Export Citation Format

Share Document