Martin Krüger

Federal Institute for Geosciences and Natural Resources

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Martin Blumenberg

Federal Institute for Geosciences and Natural Resources

Hans H. Richnow

Helmholtz Centre for Environmental Research

Tina Treude

University of California, Los Angeles

Antje Boëtius

University of Bremen

Katja Nauhaus

Ludwig-Maximilians-Universität München

Walter Michaelis

Universität Hamburg

Birte I. Oppermann

Universität Hamburg

Michael Siegert

Berlin Heart (Germany)

P. Coombs

British Geological Survey

Friedrich Widdel

Max Planck Institute for Marine Microbiology

Cooperative Institutions

Max Planck Society

Federal Institute for Geosciences and Natural Resources

Max Planck Institute for Marine Microbiology

Helmholtz Centre for Environmental Research

British Geological Survey

University of Bremen

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

RWTH Aachen University

Universität Hamburg

Japan Agency for Marine-Earth Science and Technology

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From whale to chemosynthesis: Energy and carbon fluxes at a deep-sea whale fall

Tina Treude Craig R. Smith Frank Wenzhöfer Eryn Carney Ângelo F. Bernardino

Chemosynthesis

Right whale

Carbon flux

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Microbial methane turnover in different marine habitats

Palaeogeography Palaeoclimatology Palaeoecology (2005)

Martin Krüger Tina Treude Heike Wolters Katja Nauhaus Antje Boëtius

Cold seep

Clathrate hydrate

Atmospheric methane

10.1016/j.palaeo.2005.04.031

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Citations (101)

The biogenic methane potential of European gas shale analogues: Results from incubation experiments and thermodynamic modelling

International Journal of Coal Geology (2014)

Martin Krüger Wolfgang van Berk Esther T Arning Núria Jiménez Niels H. Schovsbo

10.1016/j.coal.2014.09.012

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Citations (14)

Evidence for in situ methanogenic oil degradation in the Dagang oil field

Organic Geochemistry (2012)

Núria Jiménez Brandon E. L. Morris Minmin Cai Friederike Gründger Jun Yao

Hexadecane

Alkylbenzenes

Microcosm

Aromatic hydrocarbon

Light crude oil

Produced water

10.1016/j.orggeochem.2012.08.009

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Citations (46)

Soil microbial community changes as a result of long-term exposure to a natural CO2 vent

Geochimica et Cosmochimica Acta (2010)

Birte I. Oppermann Walter Michaelis Martin Blumenberg Janin Frerichs Hans-Martin Schulz

Stable-isotope probing

Crenarchaeota

Euryarchaeota

10.1016/j.gca.2010.02.006

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Citations (150)

Microbial processes influencing methane emission from rice fields

Global Change Biology (2001)

Martin Krüger Peter Frenzel Ralf Conrad

Summary Irrigated rice fields are an important source of atmospheric methane. In order to improve our understanding of the controlling processes, we measured in situ CH 4 emission and CH 4 oxidation in an Italian rice field in 1998 and 1999, and studied CH 4 production in soil and root samples. The CH 4 emission rates were correlated with diurnal temperature variations and showed pronounced seasonal and interannual variations. The contribution of CH 4 oxidation to total CH 4 flux, determined by specific inhibition with difluoromethane, decreased from 40% at the beginning to zero at the end of the season. The stable carbon isotopic composition of the emitted CH 4 also decreased. The CH 4 ‐oxidizing bacteria probably became limited by nitrogen as indicated by the seasonal decrease of NH 4 + . Thus, CH 4 oxidation had little effect on CH 4 emission. Methane production on rice roots was relatively constant over the season. Methane production in soil slowly increased after flooding and was highest in the middle of the season. Pore water concentrations of CH 4 showed a similar seasonal pattern. In 1999, CH 4 production increased later in the season and reached lower rates than in 1998. An additional drainage in 1999 resulted in higher ferric iron concentrations, higher soil redox potentials and lower acetate concentrations. As a result, acetate‐utilizing methanogens were probably out‐competed by iron‐reducers so that a larger percentage of [2– 14 C]acetate was converted to 14 CO 2 instead of 14 CH 4 . The residual CH 4 production was relatively low and was mainly due to H 2 /CO 2 ‐dependent methanogenesis. Experiments with radioactive bicarbonate and with methyl fluoride as specific inhibitor showed that the theoretical ratio of 7:3 of methanogenesis from acetate vs. H 2 /CO 2 was only reached later in the season when total CH 4 production was at the maximum. In conclusion, our results give a mechanistic explanation for the intraseasonal and interannual differences in CH 4 emission.

Paddy field

Growing season

10.1046/j.1365-2486.2001.00395.x

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Citations (257)

Role ofBacteria,ArchaeaandFungiinvolved in Methane Release in Abandoned Coal Mines

Geomicrobiology Journal (2011)

Sabrina Beckmann Martin Krüger Bert Engelen Anna A. Gorbushina Heribert Cypionka

Worldwide, abandoned coal mines release substantial amounts of methane, which is largely of biogenic origin. The aim of this study was to understand the microbial processes involved in mine-gas formation. Therefore, coal and timber samples and anaerobic enrichments from two abandoned coal mines in Germany were subjected to DGGE analyses and quantitative PCR. The primers used were specific for Bacteria, Archaea, Fungi, and the key functional genes for sulfate reduction (dsrA) and methanogenesis (mcrA). A broad spectrum of facultative anaerobic bacteria and acetogens belonging to all five groups (α-ϵ) of the Proteobacteria, as well as the Bacteroidetes, Tenericutes, Actinobacteria, Chlorobi and Chloroflexi were detected. Archaea were represented by acetoclastic Methanosarcinales and Crenarchaeota with an unknown metabolism. Fungi formed thick biofilms particularly on timber, and were identified as typical wood degraders belonging to the Ascomycetes and Basidiomycetes. The community analysis as well as the environmental conditions and the metabolites detected in a previous study are consistent with the following scenario of methane release: Weathering of coal and timber is initiated by wood-degrading Fungi and Bacteria under a suboxic atmosphere. In the lower, oxygen-depleted layers Fungi and Bacteria perform incomplete oxidation and release reduced substrates which can be channeled into methanogenesis. Acetate appeared to be the main precursor of the biogenic methane in the investigated coal mines.

Chloroflexi (class)

Crenarchaeota

Euryarchaeota

Acetogenesis

Facultative

10.1080/01490451.2010.503258

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Citations (59)

Microbiological investigation of methane‐ and hydrocarbon‐discharging mud volcanoes in the Carpathian Mountains, Romania

Environmental Microbiology (2005)

Karine Alain Thomas Holler Florin Musat Marcus Elvert Tina Treude

Summary Paclele Mici is a terrestrial mud volcano field located in the Carpathian Mountains (Romania), where thermal alteration of sedimentary organic compounds leads to methane, higher hydrocarbons and other petroleum compounds that are continuously released into the environment. The hydrocarbons represent potential substrates for microorganisms. We studied lipid biomarkers, stable isotope ratios, the effect of substrate (methane, other organic compounds) addition and 16S rRNA genes to gain insights into the hitherto unknown microbial community at this site. Quantitative real‐time polymerase chain reaction analysis demonstrated that bacteria were much more abundant than archaea. Phylogenetic analyses of 16S rDNA clone sequences indicated the presence of bacterial and archaeal lineages generally associated with the methane cycle (methanogens, aerobic and anaerobic methanotrophs), the sulfur cycle (sulfate reducers), and groups linked to the anaerobic degradation of alkanes or aromatic hydrocarbons. The presence of sulfate reducers, methanogens and methanotrophs in this habitat was also confirmed by concurrent surveys of lipid biomarkers and their isotopic signatures. Incubation experiments with several common and complex substrates revealed the potential of the indigenous microbial community for sulfate reduction, methanogenesis and aerobic methanotrophy. Additionally, consistently to the detection of methane‐oxidizing archaea (ANME) and 13 C‐depleted archaeal lipids, a weak but significant activity of anaerobic methane oxidation was measured by radiotracer techniques and in vitro . This survey is the first to report the presence and activity of ANME in a terrestrial environment.

Sulfate-Reducing Bacteria

Mud volcano

10.1111/j.1462-2920.2005.00922.x

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Citations (140)

Anaerobic oxidation of methane at Hydrate Ridge (OR)

Geochimica et Cosmochimica Acta (2003)

Tina Treude Antje Boëtius Katrin Knittel Katja Nauhaus Marcus Elvert

Clathrate hydrate

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Citations (7)