Preprints

Filtering by Subject: Environmental Microbiology and Microbial Ecology Life Sciences

Description of the continuous nature of organic matter in models of soil carbon dynamics

Julien Sainte-Marie, Matthieu Barrandon, Laurent Sainte-André, Eric Gelhaye, Francis Martin, Delphine Derrien

Published: 2020-05-28
Subjects: Applied Mathematics, Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Geochemistry, Life Sciences, Microbiology, Physical Sciences and Mathematics, Soil Science

The understanding of soil organic matter (SOM) dynamics has considerably advanced in recent years. It was previously assumed that most SOM consisted of recalcitrant compounds, whereas the emerging view considers SOM as a range of polymers continuously processed into smaller molecules by decomposer enzymes. Mainstreaming these new insights in current models is challenging because of their [...]

Weak influence of paleoenvironmental conditions on the subsurface biosphere of lake Ohrid in the last 515 ka

Camille Thomas, Alexander Francke, Hendrik Vogel, Bernd Wagner, Daniel Ariztegui

Published: 2020-04-13
Subjects: Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Environmental Sciences, Life Sciences, Microbiology, Other Earth Sciences, Paleobiology, Physical Sciences and Mathematics

Understanding the response of geo- and biosystems to past climatic disturbance is primordial to assess the short to long terms effects of current global change. Lacustrine sediments are commonly used to investigate the impact of climatic change on biogeochemical cycling. In these sediments, subsurface microbial communities play a primordial role in nutrient, organic matter and elemental cycling, [...]

Iron mineral dissolution releases iron and associated organic carbon during permafrost thaw

Monique S Patzner, Carsten W. Mueller, Miroslava Malusova, Moritz Baur, Verena Nikeleit, Thomas Scholten, Carmen Hoeschen, James Byrne, Thomas Borch, Andreas Kappler

Published: 2020-02-07
Subjects: Environmental Microbiology and Microbial Ecology Life Sciences, Environmental Sciences, Life Sciences, Microbiology, Physical Sciences and Mathematics

It has been shown that reactive soil minerals, specifically iron(III) (oxyhydr)oxides, can trap organic carbon in soils overlying intact permafrost, and may limit carbon mobilization and degradation as it is observed in other environments. However, the use of iron(III)-bearing minerals as terminal electron acceptors in permafrost environments and thus their stability and capacity to prevent [...]

Plate tectonics drive deep biosphere microbial community structure

Katherine M. Fullerton, Matthew Schrenk, Mustafa Yucel, Elena Manini, Basili Marco, Timothy J. Rogers, Daniele Fattorini, Marta di Carlo, Giuseppe d'Errico, Francesco Regoli

Published: 2019-10-13
Subjects: Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Life Sciences, Microbiology, Other Earth Sciences, Physical Sciences and Mathematics

The deep subsurface is one of Earth’s largest biomes. Here, microorganisms modify volatiles moving between the deep and surface Earth. However, it is unknown whether large-scale tectonic processes affect the distribution of microorganisms across this subterranean landscape. We sampled subsurface microbial ecosystems in deeply-sourced springs across the Costa Rican convergent margin. Noble gases, [...]

Possible Tectonic Impact of Biosphere

Eugene Bagashov

Published: 2019-09-19
Subjects: Environmental Microbiology and Microbial Ecology Life Sciences, Life Sciences, Microbiology

This paper explores the possibility of existence of ultra-deep biosphere (deeper than 10 km under the surface) and the biogenic earthquake hypothesis -- the idea that subsurface microorganisms might be directly related to earthquake activity. The importance of electroautotrophic type of metabolism is underlined, and the role of telluric currents in this process is explored in some detail, as well [...]

Dark carbon fixation contributes to sedimentary organic carbon in the Arabian Sea oxygen minimum zone

Sabine Lengger, Darci Rush, Jan Peter Mayser, Jerome Blewett, Rachel Schwartz-Narbonne, Helen Talbot, Jack Middelburg, Mike Jetten, Stefan Schouten, Jaap Damste

Published: 2019-05-18
Subjects: Biogeochemistry, Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Life Sciences, Microbiology, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

In response to rising CO2 concentrations and increasing global sea surface temperatures, oxygen minimum zones (OMZ), or “dead zones”, are expected to expand. OMZs are fueled by high primary productivity, resulting in enhanced biological oxygen demand at depth, subsequent oxygen depletion, and attenuation of remineralization. This results in the deposition of organic carbon-rich sediments. Carbon [...]

Living at the Extremes: Extremophiles and the Limits of Life in a Planetary Context

Nancy Merino, Heidi S Aronson, Diana Bojanova, Jayme Feyhl-Buska, Michael L Wong, Shu Zhang, Donato Giovannelli

Published: 2019-02-05
Subjects: Environmental Microbiology and Microbial Ecology Life Sciences, Life Sciences, Microbiology

Prokaryotic life has dominated most of the evolutionary history of our planet, evolving to occupy virtually all available environmental niches. Extremophiles, especially those thriving under multiple extremes, represent a key area of research for multiple disciplines, spanning from the study of adaptations to harsh conditions, to the biogeochemical cycling of elements. Extremophile research also [...]

A Critical Review of Polyphosphate Accumulating Organisms for Agricultural Water Quality Management

Sheila M. Saia, Hunter J. Carrick, Anthony R. Buda, John M. Regan, M. Todd Walter

Published: 2018-12-03
Subjects: Agriculture, Biogeochemistry, Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Environmental Sciences, Life Sciences, Microbiology, Natural Resources Management and Policy, Physical Sciences and Mathematics, Soil Science, Water Resource Management

Despite ongoing management efforts, phosphorus (P) loading from agricultural landscapes continues to impair water quality. Wastewater treatment plant research has enhanced our knowledge of microbial mechanisms influencing P cycling, especially related to microbes known as polyphosphate accumulating organisms (PAOs) that store P as polyphosphate (polyP) under aerobic conditions and release P under [...]

The origin and role of biological rock crusts in rocky desert weathering

Nimrod Wieler, Hanan Ginat, Osnat Gillor, Roey Angel

Published: 2018-09-24
Subjects: Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Geomorphology, Life Sciences, Microbiology, Physical Sciences and Mathematics

In drylands, microbes that colonise rock surfaces were linked to erosion because water scarcity excludes traditional weathering mechanisms. We studied the origin and role of rock biofilms in geomorphic processes of hard lime and dolomitic rocks that feature comparable weathering morphologies though originating from arid and hyperarid environments, respectively. We hypothesised that weathering [...]

Fluid inclusions from the deep Dead Sea sediment provide new insights on Holocene extreme microbial life

Camille Thomas, Daniel Ariztegui

Published: 2018-07-24
Subjects: Biology, Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Life Sciences, Microbiology, Paleobiology, Physical Sciences and Mathematics

The Dead Sea Deep Drilling Project allowed to retrieve a continuous sedimentary record spanning the two last glacial cycles. This unique archive, in such an extreme environment, has allowed for the development of new proxies and the refinement of already available paleoenvironmental studies. In particular, the interaction of the lake and sediment biosphere with elements and minerals that [...]

Erosion-initiated stromatolite formation in a recent hypersaline sabkha setting (Abu Dhabi, United Arab Emirates)

Andreas Paul, Stephen W. Lokier, Wesley M. Court, Cees van der Land, Luiza L. Andrade, Kirsten E. Dutton, Angela Sherry, Ian M. Head

Published: 2018-02-13
Subjects: Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Life Sciences, Microbiology, Physical Sciences and Mathematics, Sedimentology

Laminated microbial mats and microbialites are documented from a variety of coastal marine environments. These features form through: a) the combination of trapping and binding of allochthonous grains, and b) microbially-mediated or controlled precipitation of a variety of minerals, including high-magnesium calcite and dolomite. Intertidal pools and associated microbial features have been [...]

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