Preprints

Filtering by Subject: Environmental Microbiology and Microbial Ecology Life Sciences

Surface bacterioplankton community structure crossing the Antarctic Circumpolar Current Fronts

Matteo Selci, Angelina Cordone, Bernardo Barosa, et al.

Published: 2023-01-31
Subjects: Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences

The Antarctic Circumpolar Current (ACC) is the major current in the Southern Ocean, isolating the warm stratified subtropical waters from the more homogeneous cold polar waters. The ACC flows from west to east around Antarctica and generates an overturning circulation by fostering deep-cold water upwelling and the formation of new water masses, affecting the Earth's heat balance and the global [...]

Trait-based modeling revealed higher microbial diversity leads to greater ecological resilience in response to an ecosystem disturbance

Jiaze Wang, Victoria J. Coles, Michael R. Stukel, et al.

Published: 2022-10-15
Subjects: Biogeochemistry, Earth Sciences, Environmental Microbiology and Microbial Ecology Life Sciences, Microbiology, Oceanography, Oil, Gas, and Energy, Physical Sciences and Mathematics, Sustainability, Terrestrial and Aquatic Ecology

To quantitatively understand the ecological resilience of an ecosystem with specialized habitats, we focused on deep-sea microbial communities and simulated the response of diverse microbes in specialized habitats to a pulse ecosystem disturbance - the Deepwater Horizon Oil Spill in the Gulf of Mexico. Two microbial communities with equivalent metabolic libraries were acclimated to the presence [...]

Freshwater Suspended Particulate Matter – Key Components and Processes in Floc Formation and Dynamics.

Helene Walch, Frank von der Kammer, Thilo Hofmann

Published: 2022-02-18
Subjects: Biogeochemistry, Environmental Chemistry, Environmental Microbiology and Microbial Ecology Life Sciences, Environmental Sciences, Fresh Water Studies, Geochemistry, Hydrology, Sedimentology

Freshwater suspended particulate matter (SPM) plays an important role in many biogeochemical cycles and serves multiple ecosystem functions. Most SPM is present as complex floc-like aggregate structures composed of various minerals and organic matter from the molecular to the organism level. Flocs provide habitat for microbes and feed for larger organisms. They constitute microbial bioreactors, [...]

A re-examination of the mechanism of whiting events: A new role for diatoms in Fayetteville Green Lake (New York, USA)

Chloe Stanton, Julie Cosmidis, Lee Kump

Published: 2021-05-08
Subjects: Biogeochemistry, Environmental Microbiology and Microbial Ecology Life Sciences, Geochemistry, Life Sciences, Sedimentology

Whiting events – the episodic precipitation of fine-grained suspended calcium cabonates in the water column – have been documented across a variety of marine and lacustrine environments. Whitings likely are a major source of carbonate muds, a constituent of limestones, and important archives for geochemical proxies of Earth history. While several biological and physical mechanisms have been [...]

The gap between atmospheric nitrogen deposition experiments and reality

Daniel Patrick Bebber

Published: 2021-05-05
Subjects: Agricultural Science, Agriculture, Atmospheric Sciences, Biogeochemistry, Environmental Indicators and Impact Assessment, Environmental Microbiology and Microbial Ecology Life Sciences, Environmental Monitoring, Forest Biology, Other Environmental Sciences, Planetary Biogeochemistry, Soil Science, Terrestrial and Aquatic Ecology

Anthropogenic activities have dramatically altered the global nitrogen (N) cycle. Atmospheric N deposition, primarily from combustion of biomass and fossil fuels, has caused acidification of precipitation and freshwater and triggered intense research into ecosystem responses to this pollutant. Experimental simulations of N deposition have been the main scientific tool to understand ecosystem [...]

Mars Dichotomy: Prospects for human life on Mars

María Angélica Leal Leal, David Tovar, Jimena Sánchez Nieves, et al.

Published: 2021-03-04
Subjects: Biology, Environmental Microbiology and Microbial Ecology Life Sciences, Medical Sciences, Other Astrophysics and Astronomy, Other Food Science, Planetary Geology, Planetary Sciences

Within the framework of the Mars City State Contest 2020 of The Mars Society, from Colombia, with an interdisciplinary and academic perspective, it was sought to give a perspective of solutions and answers to the challenges of possible human life on Mars. Thus, the document initially addresses a forward-looking prologue, an introduction to the concept of the proposed state, taking as a starting [...]

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

Julien Sainte-Marie, Matthieu Barrandon, Laurent Sainte-André, et al.

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, et al.

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, et al.

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 O Schrenk, Mustafa Yücel, et al.

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, et al.

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, et al.

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 [...]

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

Sheila M. Saia, Hunter J. Carrick, Anthony R. Buda, et al.

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 research has enhanced our knowledge of microbial mechanisms influencing P cycling, especially regarding microbes known as polyphosphate accumulating organisms (PAOs) that store P as polyphosphate (polyP) under oxic conditions and release P under anoxic [...]

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

Nimrod Wieler, Hanan Ginat, Osnat Gillor, et al.

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 [...]

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