Articles | Volume 17, issue 16
https://doi.org/10.5194/bg-17-4355-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-17-4355-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Aug 2020
Research article |
| 28 Aug 2020
| 28 Aug 2020
Impact of reactive surfaces on the abiotic reaction between nitrite and ferrous iron and associated nitrogen and oxygen isotope dynamics
Anna-Neva Visser
CORRESPONDING AUTHOR
Department of Environmental Sciences, Basel University,
Bernoullistrasse 30, 4056 Basel, Switzerland
Department of Geosciences, Tübingen University,
Hölderlinstrasse 12, 72074 Tübingen, Germany
Scott D. Wankel
Woods Hole Oceanographic Institution, Woods Hole, 360 Woods Hole Rd,
MA 02543, USA
Pascal A. Niklaus
Department of Evolutionary Biology and Environmental Studies,
University of Zurich, Winterthurerstrasse 190, 8057 Zurich,
Switzerland
James M. Byrne
Department of Geosciences, Tübingen University,
Hölderlinstrasse 12, 72074 Tübingen, Germany
Andreas A. Kappler
Department of Geosciences, Tübingen University,
Hölderlinstrasse 12, 72074 Tübingen, Germany
Moritz F. Lehmann
Department of Environmental Sciences, Basel University,
Bernoullistrasse 30, 4056 Basel, Switzerland
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Kirstin Dähnke, Tina Sanders, Yoana Voynova, and Scott D. Wankel
Biogeosciences, 19, 5879–5891, https://doi.org/10.5194/bg-19-5879-2022, https://doi.org/10.5194/bg-19-5879-2022, 2022
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Nitrogen is an important macronutrient that fuels algal production in rivers and coastal regions. We investigated the production and removal of nitrogen-bearing compounds in the freshwater section of the tidal Elbe Estuary and found that particles in the water column are key for the production and removal of water column nitrate. Using a stable isotope approach, we pinpointed regions where additional removal of nitrate or input from sediments plays an important role in estuarine biogeochemistry.
Owen A. Sherwood, Samuel H. Davin, Nadine Lehmann, Carolyn Buchwald, Evan N. Edinger, Moritz F. Lehmann, and Markus Kienast
Biogeosciences, 18, 4491–4510, https://doi.org/10.5194/bg-18-4491-2021, https://doi.org/10.5194/bg-18-4491-2021, 2021
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Pacific water flowing eastward through the Canadian Arctic plays an important role in redistributing nutrients to the northwest Atlantic Ocean. Using samples collected from northern Baffin Bay to the southern Labrador Shelf, we show that stable isotopic ratios in seawater nitrate reflect the fraction of Pacific to Atlantic water. These results provide a new framework for interpreting patterns of nitrogen isotopic variability recorded in modern and archival organic materials in the region.
Sigrid van Grinsven, Kirsten Oswald, Bernhard Wehrli, Corinne Jegge, Jakob Zopfi, Moritz F. Lehmann, and Carsten J. Schubert
Biogeosciences, 18, 3087–3101, https://doi.org/10.5194/bg-18-3087-2021, https://doi.org/10.5194/bg-18-3087-2021, 2021
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Lake Lovojärvi is a nutrient-rich lake with high amounts of methane at the bottom, but little near the top. Methane comes from the sediment and rises up through the water but is consumed by microorganisms along the way. They use oxygen if available, but in deeper water layers, no oxygen was present. There, nitrite, iron and humic substances were used, besides a collaboration between photosynthetic organisms and methane consumers, in which the first produced oxygen for the latter.
Yunhua Chang, Yan-Lin Zhang, Sawaeng Kawichai, Qian Wang, Martin Van Damme, Lieven Clarisse, Tippawan Prapamontol, and Moritz F. Lehmann
Atmos. Chem. Phys., 21, 7187–7198, https://doi.org/10.5194/acp-21-7187-2021, https://doi.org/10.5194/acp-21-7187-2021, 2021
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In this study, we integrated satellite constraints on atmospheric NH3 levels and fire intensity, discrete NH3 concentration measurement, and N isotopic analysis of NH3 in order to assess the regional-scale contribution of biomass burning to ambient atmospheric NH3 in the heartland of Southeast Asia. The combined approach provides a valuable cross-validation framework for source apportioning of NH3 in the lower atmosphere and will thus help to ameliorate predictions of biomass burning emissions.
Maitane Iturrate-Garcia, Monique M. P. D. Heijmans, J. Hans C. Cornelissen, Fritz H. Schweingruber, Pascal A. Niklaus, and Gabriela Schaepman-Strub
Biogeosciences, 17, 4981–4998, https://doi.org/10.5194/bg-17-4981-2020, https://doi.org/10.5194/bg-17-4981-2020, 2020
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Changes on plant traits associated with climate warming might alter vegetation–climate interactions. We investigated experimentally the effects of enhanced permafrost thaw and soil nutrients on a wide set of tundra shrub traits. We found a coordinated trait response to some treatments, which suggests a shift in shrub resource, growth and defence strategies. This shift might feed back into permafrost thaw – through mechanisms associated with water demand – and into carbon and energy fluxes.
Yuge Bai, Edisson Subdiaga, Stefan B. Haderlein, Heike Knicker, and Andreas Kappler
Biogeosciences, 17, 683–698, https://doi.org/10.5194/bg-17-683-2020, https://doi.org/10.5194/bg-17-683-2020, 2020
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Biogeochemical processes of SOM are key for greenhouse gas emission and water quality. We extracted SOM by water or by NaOH–HCl under oxic–anoxic conditions. Chemical and anoxic extractions lead to higher SOM electron exchange capacities, resulting in stimulation of microbial Fe(III) reduction. Therefore, aqueous pH-neutral SOM extracts should be used to reflect environmental SOM redox processes, and artifacts of chemical extractions need to be considered when evaluating SOM redox processes.
Adeline N. Y. Cojean, Jakob Zopfi, Alan Gerster, Claudia Frey, Fabio Lepori, and Moritz F. Lehmann
Biogeosciences, 16, 4705–4718, https://doi.org/10.5194/bg-16-4705-2019, https://doi.org/10.5194/bg-16-4705-2019, 2019
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Our results demonstrate the importance of oxygen in regulating the fate of nitrogen (N) in the sediments of Lake Lugano south basin, Switzerland. Hence, our study suggests that, by changing oxygen concentration in bottom waters, the seasonal water column turnover may significantly regulate the partitioning between N removal and N recycling in surface sediments, and it is likely that a similar pattern can be expected in a wide range of environments.
Yunhua Chang, Yan-Lin Zhang, Jiarong Li, Chongguo Tian, Linlin Song, Xiaoyao Zhai, Wenqi Zhang, Tong Huang, Yu-Chi Lin, Chao Zhu, Yunting Fang, Moritz F. Lehmann, and Jianmin Chen
Atmos. Chem. Phys., 19, 12221–12234, https://doi.org/10.5194/acp-19-12221-2019, https://doi.org/10.5194/acp-19-12221-2019, 2019
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The present work underscores the value of cloud water dissolved inorganic nitrogen isotopes as carriers of quantitative information on regional NOx and NH3 emissions. It sheds light on the origin and production pathways of nitrogenous species in clouds and emphasizes the importance of biomass-burning-derived nitrogenous species as cloud condensation nuclei in China’s troposphere. Moreover, it highlights the rapid evolution of NOx emissions in China.
Haoyi Yao, Wei-Li Hong, Giuliana Panieri, Simone Sauer, Marta E. Torres, Moritz F. Lehmann, Friederike Gründger, and Helge Niemann
Biogeosciences, 16, 2221–2232, https://doi.org/10.5194/bg-16-2221-2019, https://doi.org/10.5194/bg-16-2221-2019, 2019
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How methane is transported in the sediment is important for the microbial community living on methane. Here we report an observation of a mini-fracture that facilitates the advective gas transport of methane in the sediment, compared to the diffusive fluid transport without a fracture. We found contrasting bio-geochemical signals in these different transport modes. This finding can help to fill the gap in the fracture network system in modulating methane dynamics in surface sediments.
Martin Ley, Moritz F. Lehmann, Pascal A. Niklaus, and Jörg Luster
Biogeosciences, 15, 7043–7057, https://doi.org/10.5194/bg-15-7043-2018, https://doi.org/10.5194/bg-15-7043-2018, 2018
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Our laboratory study shows how microhabitat formation linked to soil aggregates, litter accumulation and plant soil interactions affects conditions under which
hot momentsof enhanced N2O emissions from floodplain soils during the drying phase after saturation occur. Larger aggregate size led to higher integrated flux rates when soil was unamended or mixed with leaf litter, whereas planting with willow significantly reduced emissions. Also, emission time patterns differed among the treatments.
Yunhua Chang, Yanlin Zhang, Chongguo Tian, Shichun Zhang, Xiaoyan Ma, Fang Cao, Xiaoyan Liu, Wenqi Zhang, Thomas Kuhn, and Moritz F. Lehmann
Atmos. Chem. Phys., 18, 11647–11661, https://doi.org/10.5194/acp-18-11647-2018, https://doi.org/10.5194/acp-18-11647-2018, 2018
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We demonstrate that it is imperative that future studies, making use of isotope mixing models to gain conclusive constraints on the source partitioning of atmospheric NOx, consider this N isotope fractionation. Future assessments of NOx emissions in China (and elsewhere) should involve simultaneous δ15N and δ18O measurements of atmospheric nitrate and NOx at high spatiotemporal resolution, allowing former N-isotope-based NOx source partitioning estimates to be reevaluated more quantitatively.
Lea Steinle, Johanna Maltby, Tina Treude, Annette Kock, Hermann W. Bange, Nadine Engbersen, Jakob Zopfi, Moritz F. Lehmann, and Helge Niemann
Biogeosciences, 14, 1631–1645, https://doi.org/10.5194/bg-14-1631-2017, https://doi.org/10.5194/bg-14-1631-2017, 2017
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Large amounts of methane are produced in anoxic, coastal sediments, from which it can seep into the overlying water column. Aerobic oxidation of methane (MOx) mediated by methanotrophic bacteria is an important sink for methane before its evasion to the atmosphere. In a 2-year seasonal study, we investigated the spatio-temporal variability of MOx in a seasonally hypoxic coastal inlet using radiotracer-based methods. In experiments, we assessed the effect of variable oxygen concentrations on MOx.
S. D. Wankel, C. Buchwald, W. Ziebis, C. B. Wenk, and M. F. Lehmann
Biogeosciences, 12, 7483–7502, https://doi.org/10.5194/bg-12-7483-2015, https://doi.org/10.5194/bg-12-7483-2015, 2015
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In the sediments underlying the global oligotrophic ocean, low levels of microbial activity persist, despite low input of organic matter from surface ocean productivity. Using measured nitrogen and oxygen isotopes of porewater nitrate we estimate the magnitude and extent of microbial nitrogen cycling. We find evidence for the overlap of both denitrification as well as autotrophic pathways such as nitrification and nitrogen fixation, pointing to a relatively large role for subsurface autotrophy.
C. V. Freymond, C. B. Wenk, C. H. Frame, and M. F. Lehmann
Biogeosciences, 10, 8373–8383, https://doi.org/10.5194/bg-10-8373-2013, https://doi.org/10.5194/bg-10-8373-2013, 2013
M. Alkhatib, P. A. del Giorgio, Y. Gelinas, and M. F. Lehmann
Biogeosciences, 10, 7609–7622, https://doi.org/10.5194/bg-10-7609-2013, https://doi.org/10.5194/bg-10-7609-2013, 2013
R. Zurbrügg, S. Suter, M. F. Lehmann, B. Wehrli, and D. B. Senn
Biogeosciences, 10, 23–38, https://doi.org/10.5194/bg-10-23-2013, https://doi.org/10.5194/bg-10-23-2013, 2013
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Biogeochemistry: Environmental Microbiology
Changes in diazotrophic community structure associated with Kuroshio succession in the northern South China Sea
Technical note: A comparison of methods for estimating coccolith mass
Fractionation of stable carbon isotopes during formate consumption in anoxic rice paddy soils and lake sediments
Effects of surface water interactions with karst groundwater on microbial biomass, metabolism, and production
Characteristics of bacterial and fungal communities and their associations with sugar compounds in atmospheric aerosols at a rural site in northern China
Overview: ‘Global change effects on terrestrial biogeochemistry at the plant-soil interface’
Responses of globally important phytoplankton species to olivine dissolution products and implications for carbon dioxide removal via ocean alkalinity enhancement
Differentiation of cognate bacterial communities in thermokarst landscapes: implications for ecological consequences of permafrost degradation
A multi-phase biogeochemical model for mitigating earthquake-induced liquefaction via microbially induced desaturation and calcium carbonate precipitation
Phosphorus regulates ectomycorrhizal fungi biomass production in a Norway spruce forest
Reallocation of elemental content and macromolecules in the coccolithophore Emiliania huxleyi to acclimate to climate change
Abrasion of sedimentary rocks as a source of hydrogen peroxide and nutrients to subglacial ecosystems
Nitrous oxide (N2O) synthesis by the freshwater cyanobacterium Microcystis aeruginosa
Interdisciplinary strategy to assess the impact of meteorological variables on the biochemical composition of the rain and the dynamics of a small eutrophic lake under rain forcing
Depth-related patterns in microbial community responses to complex organic matter in the western North Atlantic Ocean
Assessing the influence of ocean alkalinity enhancement on a coastal phytoplankton community
Eddy-enhanced primary production sustains heterotrophic microbial activities in the Eastern Tropical North Atlantic
Composition and niche-specific characteristics of microbial consortia colonizing Marsberg copper mine in the Rhenish Massif
Diversity and assembly processes of microbial eukaryotic communities in Fildes Peninsula Lakes (West Antarctica)
Nitrophobic ectomycorrhizal fungi are associated with enhanced hydrophobicity of soil organic matter in a Norway spruce forest
Physiological control on carbon isotope fractionation in marine phytoplankton
Implementation of mycorrhizal mechanisms into soil carbon model improves the prediction of long-term processes of plant litter decomposition
Impact of dust addition on the microbial food web under present and future conditions of pH and temperature
Fractionation of stable carbon isotopes during acetate consumption by methanogenic and sulfidogenic microbial communities in rice paddy soils and lake sediments
Hydrothermal trace metal release and microbial metabolism in the northeastern Lau Basin of the South Pacific Ocean
Sedimentation rate and organic matter dynamics shape microbiomes across a continental margin
Disturbance triggers non-linear microbe–environment feedbacks
Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the southern Indian Ocean and the Southern Ocean
Microbial and geo-archaeological records reveal the growth rate, origin and composition of desert rock surface communities
Metagenomic insights into the metabolism of microbial communities that mediate iron and methane cycling in Lake Kinneret iron-rich methanic sediments
Spatiotemporal patterns of N2 fixation in coastal waters derived from rate measurements and remote sensing
Biotic and abiotic transformation of amino acids in cloud water: experimental studies and atmospheric implications
Potential bioavailability of organic matter from atmospheric particles to marine heterotrophic bacteria
Microbial functional signature in the atmospheric boundary layer
New insight to niche partitioning and ecological function of ammonia oxidizing archaea in subtropical estuarine ecosystem
Reviews and syntheses: Bacterial bioluminescence – ecology and impact in the biological carbon pump
Salinity-dependent algae uptake and subsequent carbon and nitrogen metabolisms of two intertidal foraminifera (Ammonia tepida and Haynesina germanica)
On giant shoulders: how a seamount affects the microbial community composition of seawater and sponges
Spatial variations in sedimentary N-transformation rates in the North Sea (German Bight)
Patterns of (trace) metals and microorganisms in the Rainbow hydrothermal vent plume at the Mid-Atlantic Ridge
Co-occurrence of Fe and P stress in natural populations of the marine diazotroph Trichodesmium
Senescence as the main driver of iodide release from a diverse range of marine phytoplankton
Reviews and syntheses: Biological weathering and its consequences at different spatial levels – from nanoscale to global scale
Deep-sea sponge grounds as nutrient sinks: denitrification is common in boreo-Arctic sponges
Inducing the attachment of cable bacteria on oxidizing electrodes
Bacterial degradation activity in the eastern tropical South Pacific oxygen minimum zone
Macromolecular fungal ice nuclei in Fusarium: effects of physical and chemical processing
Effects of sea animal colonization on the coupling between dynamics and activity of soil ammonia-oxidizing bacteria and archaea in maritime Antarctica
Comprehensive characterization of an aspen (Populus tremuloides) leaf litter sample that maintained ice nucleation activity for 48 years
The origin and role of biological rock crusts in rocky desert weathering
Han Zhang, Guangming Mai, Weicheng Luo, Meng Chen, Ran Duan, and Tuo Shi
Biogeosciences, 21, 2529–2546, https://doi.org/10.5194/bg-21-2529-2024, https://doi.org/10.5194/bg-21-2529-2024, 2024
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We report taxon-specific biogeography of N2-fixing microbes (diazotrophs) driven by Kuroshio intrusion (Kl) into the South China Sea. We show that the composition and distribution of distinct diazotrophic taxa shift with Kl-induced variations in physicochemical parameters of seawater and that Kl shapes diazotrophic community primarily as a stochastic process. This study thus has implications for the distribution of diazotrophs in a future warming ocean, as Kls are projected to intensify.
Celina Rebeca Valença, Luc Beaufort, Gustaaf Marinus Hallegraeff, and Marius Nils Müller
Biogeosciences, 21, 1601–1611, https://doi.org/10.5194/bg-21-1601-2024, https://doi.org/10.5194/bg-21-1601-2024, 2024
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Coccolithophores contribute to the global carbon cycle and their calcite structures (coccoliths) are used as a palaeoproxy to understand past oceanographic conditions. Here, we compared three frequently used methods to estimate coccolith mass from the model species Emiliania huxleyi and the results allow for a high level of comparability between the methods, facilitating future comparisons and consolidation of mass changes observed from ecophysiological and biogeochemical studies.
Ralf Conrad and Peter Claus
Biogeosciences, 21, 1161–1172, https://doi.org/10.5194/bg-21-1161-2024, https://doi.org/10.5194/bg-21-1161-2024, 2024
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Knowledge of carbon isotope fractionation is important for the assessment of the pathways involved in the degradation of organic matter. Formate is an important intermediate during this process. It was mainly converted to carbon dioxide and acetate both in the presence and absence of sulfate. Methane was only a minor product and was mainly formed from the acetate. The acetate was depleted in the heavy carbon atom relative to formate, while the carbon dioxide was enriched.
Adrian Barry-Sosa, Madison K. Flint, Justin C. Ellena, Jonathan B. Martin, and Brent C. Christner
EGUsphere, https://doi.org/10.5194/egusphere-2024-49, https://doi.org/10.5194/egusphere-2024-49, 2024
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This study examined springs in North Central Florida focusing on how interactions between the surface and subsurface affected the properties of groundwater microbes. We found that microbes reproduced at rates that greatly exceed those documented for any other aquifer. Although the groundwater discharged to spring runs contains low concentrations of nutrients, our results indicate that microbes have access to sources of energy and produce new cells at rates similar to surface water bodies.
Mutong Niu, Shu Huang, Wei Hu, Yajie Wang, Wanyun Xu, Wan Wei, Qiang Zhang, Zihan Wang, Donghuan Zhang, Rui Jin, Libin Wu, Junjun Deng, Fangxia Shen, and Pingqing Fu
Biogeosciences, 20, 4915–4930, https://doi.org/10.5194/bg-20-4915-2023, https://doi.org/10.5194/bg-20-4915-2023, 2023
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Sugar compounds in air can trace the source of bioaerosols that affect public health and climate. In rural north China, we observed increased fungal activity at night and less variable bacterial community diversity. Certain night-increasing sugar compounds were more closely related to fungi than bacteria. The fungal community greatly influenced sugar compounds, while bacteria played a limited role. Caution is advised when using sugar compounds to trace airborne microbes, particularly bacteria.
Lucia Fuchslueger, Emily F. Solly, Alberto Canarini, and Albert C. Brangarí
EGUsphere, https://doi.org/10.5194/egusphere-2023-2975, https://doi.org/10.5194/egusphere-2023-2975, 2023
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This overview features empirical, conceptual, and modelling-based studies of the special issue ‘Global change effects on terrestrial biogeochemistry at the plant-soil interface’, summarizing key findings on plants responses to eCO2, soil organisms responses to warming, impacts on soil organic carbon, nitrogen, and mineral nutrient cycling and water level changes affecting greenhouse gas emissions, from the arctic to tropics, crucial for deciphering feedbacks to global change.
David A. Hutchins, Fei-Xue Fu, Shun-Chung Yang, Seth G. John, Stephen J. Romaniello, M. Grace Andrews, and Nathan G. Walworth
Biogeosciences, 20, 4669–4682, https://doi.org/10.5194/bg-20-4669-2023, https://doi.org/10.5194/bg-20-4669-2023, 2023
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Applications of the mineral olivine are a promising means to capture carbon dioxide via coastal enhanced weathering, but little is known about the impacts on important marine phytoplankton. We examined the effects of olivine dissolution products on species from three major phytoplankton groups: diatoms, coccolithophores, and cyanobacteria. Growth and productivity were generally either unaffected or stimulated, suggesting the effects of olivine on key phytoplankton are negligible or positive.
Ze Ren, Shudan Ye, Hongxuan Li, Xilei Huang, and Luyao Chen
Biogeosciences, 20, 4241–4258, https://doi.org/10.5194/bg-20-4241-2023, https://doi.org/10.5194/bg-20-4241-2023, 2023
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Permafrost thaw initiates thermokarst landscape formation, resulting in distinct new habitats, including degraded permafrost soil, thermokarst lake sediments, and lake water. These distinct habitats harbored differentiated bacterial communities that originated from the same source, differing in diversity, assembly mechanisms, and environmental influences. The results imply ecological consequences of permafrost degradation in the face of further climate change.
Caitlyn A. Hall, Andre van Turnhout, Edward Kavazanjian Jr., Leon A. van Paassen, and Bruce Rittmann
Biogeosciences, 20, 2903–2917, https://doi.org/10.5194/bg-20-2903-2023, https://doi.org/10.5194/bg-20-2903-2023, 2023
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Earthquake-induced soil liquefaction poses a significant global threat. Microbially induced desaturation and precipitation (MIDP) via denitrification is a potentially sustainable, non-disruptive bacteria-driven ground improvement technique under existing structures. We developed a next-generation biogeochemical model to understand and predict the behavior of MIDP in the natural environment to design field-based hazard mitigation treatments.
Juan Pablo Almeida, Lorenzo Menichetti, Alf Ekblad, Nicholas P. Rosenstock, and Håkan Wallander
Biogeosciences, 20, 1443–1458, https://doi.org/10.5194/bg-20-1443-2023, https://doi.org/10.5194/bg-20-1443-2023, 2023
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In forests, trees allocate a significant amount of carbon belowground to support mycorrhizal symbiosis. In northern forests nitrogen normally regulates this allocation and consequently mycorrhizal fungi growth. In this study we demonstrate that in a conifer forest from Sweden, fungal growth is regulated by phosphorus instead of nitrogen. This is probably due to an increase in nitrogen deposition to soils caused by decades of human pollution that has altered the ecosystem nutrient regime.
Yong Zhang, Yong Zhang, Shuai Ma, Hanbing Chen, Jiabing Li, Zhengke Li, Kui Xu, Ruiping Huang, Hong Zhang, Yonghe Han, and Jun Sun
Biogeosciences, 20, 1299–1312, https://doi.org/10.5194/bg-20-1299-2023, https://doi.org/10.5194/bg-20-1299-2023, 2023
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We found that increasing light intensity compensates for the negative effects of low phosphorus (P) availability on cellular protein and nitrogen contents. Reduced P availability, increasing light intensity, and ocean acidification act synergistically to increase cellular contents of carbohydrate and POC and the allocation of POC to carbohydrate. These regulation mechanisms in Emiliania huxleyi could provide vital information for evaluating carbon cycle in marine ecosystems under global change.
Beatriz Gill-Olivas, Jon Telling, Mark Skidmore, and Martyn Tranter
Biogeosciences, 20, 929–943, https://doi.org/10.5194/bg-20-929-2023, https://doi.org/10.5194/bg-20-929-2023, 2023
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Microbial ecosystems have been found in all subglacial environments sampled to date. Yet, little is known of the sources of energy and nutrients that sustain these microbial populations. This study shows that crushing of sedimentary rocks, which contain organic carbon, carbonate and sulfide minerals, along with previously weathered silicate minerals, produces a range of compounds and nutrients which can be utilised by the diverse suite of microbes that inhabit glacier beds.
Federico Fabisik, Benoit Guieysse, Jonathan Procter, and Maxence Plouviez
Biogeosciences, 20, 687–693, https://doi.org/10.5194/bg-20-687-2023, https://doi.org/10.5194/bg-20-687-2023, 2023
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We show, for the first time, that pure cultures of the cyanobacterium Microcystis aeruginosa can synthesize the potent greenhouse gas N2O using nitrite as substrate. Our findings have broad environmental implications because M. aeruginosa is globally found in freshwater ecosystems and is often the dominant species found in algae blooms. Further research is now needed to determine the occurrence and significance of N2O emissions from ecosystems rich with M. aeruginosa.
Fanny Noirmain, Jean-Luc Baray, Frédéric Tridon, Philippe Cacault, Hermine Billard, Guillaume Voyard, Joël Van Baelen, and Delphine Latour
Biogeosciences, 19, 5729–5749, https://doi.org/10.5194/bg-19-5729-2022, https://doi.org/10.5194/bg-19-5729-2022, 2022
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We present a study linking rain, meteorology, and mountain lake phytoplankton dynamics on the basis of a case study at Aydat (France) in September 2020. The air mass origin mainly influences the rain chemical composition, which depends on the type of rain, convective or stratiform. Our results also highlighted a non-negligible presence of photosynthetic cells in rainwater. The impact of the atmospheric forcing on the lake could play a key role in phytoplankton dynamics in the temperate zone.
Sarah A. Brown, John Paul Balmonte, Adrienne Hoarfrost, Sherif Ghobrial, and Carol Arnosti
Biogeosciences, 19, 5617–5631, https://doi.org/10.5194/bg-19-5617-2022, https://doi.org/10.5194/bg-19-5617-2022, 2022
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Bacteria use extracellular enzymes to cut large organic matter to sizes small enough for uptake. We compared the enzymatic response of surface, mid-water, and deep-ocean bacteria to complex natural substrates. Bacteria in surface and mid-depth waters produced a much wider range of enzymes than those in the deep ocean and may therefore consume a broader range of organic matter. The extent to which organic matter is recycled by bacteria depends in part on its residence time at different depths.
Aaron Ferderer, Zanna Chase, Fraser Kennedy, Kai G. Schulz, and Lennart T. Bach
Biogeosciences, 19, 5375–5399, https://doi.org/10.5194/bg-19-5375-2022, https://doi.org/10.5194/bg-19-5375-2022, 2022
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Ocean alkalinity enhancement has the capacity to remove vast quantities of carbon from the atmosphere, but its effect on marine ecosystems is largely unknown. We assessed the effect of increased alkalinity on a coastal phytoplankton community when seawater was equilibrated and not equilibrated with atmospheric CO2. We found that the phytoplankton community was moderately affected by increased alkalinity and equilibration with atmospheric CO2 had little influence on this effect.
Quentin Devresse, Kevin W. Becker, Arne Bendinger, Johannes Hahn, and Anja Engel
Biogeosciences, 19, 5199–5219, https://doi.org/10.5194/bg-19-5199-2022, https://doi.org/10.5194/bg-19-5199-2022, 2022
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Eddies are ubiquitous in the ocean and alter physical, chemical, and biological processes. However, how they affect organic carbon production and consumption is largely unknown. Here we show how an eddy triggers a cascade effect on biomass production and metabolic activities of phyto- and bacterioplankton. Our results may contribute to the improvement of biogeochemical models used to estimate carbon fluxes in the ocean.
Sania Arif, Heiko Nacke, Elias Schliekmann, Andreas Reimer, Gernot Arp, and Michael Hoppert
Biogeosciences, 19, 4883–4902, https://doi.org/10.5194/bg-19-4883-2022, https://doi.org/10.5194/bg-19-4883-2022, 2022
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The natural enrichment of Chloroflexi (Ktedonobacteria) at the Kilianstollen Marsberg copper mine rocks being exposed to the acidic sulfate-rich leachate led to an investigation of eight metagenomically assembled genomes (MAGs) involved in copper and other transition heavy metal resistance in addition to low pH resistance and aromatic compounds degradation. The present study offers functional insights about a novel cold-adapted Ktedonobacteria MAG extremophily along with other phyla MAGs.
Chunmei Zhang, Huirong Li, Yinxin Zeng, Haitao Ding, Bin Wang, Yangjie Li, Zhongqiang Ji, Yonghong Bi, and Wei Luo
Biogeosciences, 19, 4639–4654, https://doi.org/10.5194/bg-19-4639-2022, https://doi.org/10.5194/bg-19-4639-2022, 2022
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The unique microbial eukaryotic community structure and lower diversity have been demonstrated in five freshwater lakes of the Fildes Peninsula, Antarctica. Stochastic processes and biotic co-occurrence patterns were shown to be important in shaping microbial eukaryotic communities in the area. Our study provides a better understanding of the dynamic patterns and ecological assembly processes of microbial eukaryotic communities in Antarctic oligotrophic lakes (Fildes Peninsula).
Juan Pablo Almeida, Nicholas P. Rosenstock, Susanne K. Woche, Georg Guggenberger, and Håkan Wallander
Biogeosciences, 19, 3713–3726, https://doi.org/10.5194/bg-19-3713-2022, https://doi.org/10.5194/bg-19-3713-2022, 2022
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Fungi living in symbiosis with tree roots can accumulate belowground, forming special tissues than can repel water. We measured the water repellency of organic material incubated belowground and correlated it with fungal growth. We found a positive association between water repellency and root symbiotic fungi. These results are important because an increase in soil water repellency can reduce the release of CO2 from soils into the atmosphere and mitigate the effects of greenhouse gasses.
Karen M. Brandenburg, Björn Rost, Dedmer B. Van de Waal, Mirja Hoins, and Appy Sluijs
Biogeosciences, 19, 3305–3315, https://doi.org/10.5194/bg-19-3305-2022, https://doi.org/10.5194/bg-19-3305-2022, 2022
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Reconstructions of past CO2 concentrations rely on proxy estimates, with one line of proxies relying on the CO2-dependence of stable carbon isotope fractionation in marine phytoplankton. Culturing experiments provide insights into which processes may impact this. We found, however, that the methods with which these culturing experiments are performed also influence 13C fractionation. Caution should therefore be taken when extrapolating results from these experiments to proxy applications.
Weilin Huang, Peter M. van Bodegom, Toni Viskari, Jari Liski, and Nadejda A. Soudzilovskaia
Biogeosciences, 19, 1469–1490, https://doi.org/10.5194/bg-19-1469-2022, https://doi.org/10.5194/bg-19-1469-2022, 2022
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This work focuses on one of the essential pathways of mycorrhizal impact on C cycles: the mediation of plant litter decomposition. We present a model based on litter chemical quality which precludes a conclusive examination of mycorrhizal impacts on soil C. It improves long-term decomposition predictions and advances our understanding of litter decomposition dynamics. It creates a benchmark in quantitatively examining the impacts of plant–microbe interactions on soil C dynamics.
Julie Dinasquet, Estelle Bigeard, Frédéric Gazeau, Farooq Azam, Cécile Guieu, Emilio Marañón, Céline Ridame, France Van Wambeke, Ingrid Obernosterer, and Anne-Claire Baudoux
Biogeosciences, 19, 1303–1319, https://doi.org/10.5194/bg-19-1303-2022, https://doi.org/10.5194/bg-19-1303-2022, 2022
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Saharan dust deposition of nutrients and trace metals is crucial to microbes in the Mediterranean Sea. Here, we tested the response of microbial and viral communities to simulated dust deposition under present and future conditions of temperature and pH. Overall, the effect of the deposition was dependent on the initial microbial assemblage, and future conditions will intensify microbial responses. We observed effects on trophic interactions, cascading all the way down to viral processes.
Ralf Conrad, Pengfei Liu, and Peter Claus
Biogeosciences, 18, 6533–6546, https://doi.org/10.5194/bg-18-6533-2021, https://doi.org/10.5194/bg-18-6533-2021, 2021
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Acetate is an important intermediate during the anaerobic degradation of organic matter. It is consumed by methanogenic and sulfidogenic microorganisms accompanied by stable carbon isotope fractionation. We determined isotope fractionation under different conditions in two paddy soils and two lake sediments and also determined the composition of the microbial communities. Despite a relatively wide range of experimental conditions, the range of fractionation factors was quite moderate.
Natalie R. Cohen, Abigail E. Noble, Dawn M. Moran, Matthew R. McIlvin, Tyler J. Goepfert, Nicholas J. Hawco, Christopher R. German, Tristan J. Horner, Carl H. Lamborg, John P. McCrow, Andrew E. Allen, and Mak A. Saito
Biogeosciences, 18, 5397–5422, https://doi.org/10.5194/bg-18-5397-2021, https://doi.org/10.5194/bg-18-5397-2021, 2021
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A previous study documented an intense hydrothermal plume in the South Pacific Ocean; however, the iron release associated with this plume and the impact on microbiology were unclear. We describe metal concentrations associated with multiple hydrothermal plumes in this region and protein signatures of plume-influenced microbes. Our findings demonstrate that resources released from these systems can be transported away from their source and may alter the physiology of surrounding microbes.
Sabyasachi Bhattacharya, Tarunendu Mapder, Svetlana Fernandes, Chayan Roy, Jagannath Sarkar, Moidu Jameela Rameez, Subhrangshu Mandal, Abhijit Sar, Amit Kumar Chakraborty, Nibendu Mondal, Sumit Chatterjee, Bomba Dam, Aditya Peketi, Ranadhir Chakraborty, Aninda Mazumdar, and Wriddhiman Ghosh
Biogeosciences, 18, 5203–5222, https://doi.org/10.5194/bg-18-5203-2021, https://doi.org/10.5194/bg-18-5203-2021, 2021
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Physicochemical determinants of microbiome architecture across continental shelves–slopes are unknown, so we explored the geomicrobiology along 3 m sediment horizons of seasonal (shallow coastal) and perennial (deep sea) hypoxic zones of the Arabian Sea. Nature, concentration, and fate of the organic matter delivered to the sea floor were found to shape the microbiome across the western Indian margin, under direct–indirect influence of sedimentation rate and water column O2 level.
Aditi Sengupta, Sarah J. Fansler, Rosalie K. Chu, Robert E. Danczak, Vanessa A. Garayburu-Caruso, Lupita Renteria, Hyun-Seob Song, Jason Toyoda, Jacqueline Hager, and James C. Stegen
Biogeosciences, 18, 4773–4789, https://doi.org/10.5194/bg-18-4773-2021, https://doi.org/10.5194/bg-18-4773-2021, 2021
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Conceptual models link microbes with the environment but are untested. We test a recent model using riverbed sediments. We exposed sediments to disturbances, going dry and becoming wet again. As the length of dry conditions got longer, there was a sudden shift in the ecology of microbes, chemistry of organic matter, and rates of microbial metabolism. We propose a new model based on feedbacks initiated by disturbance that cascade across biological, chemical, and functional aspects of the system.
Cora Hörstmann, Eric J. Raes, Pier Luigi Buttigieg, Claire Lo Monaco, Uwe John, and Anya M. Waite
Biogeosciences, 18, 3733–3749, https://doi.org/10.5194/bg-18-3733-2021, https://doi.org/10.5194/bg-18-3733-2021, 2021
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Microbes are the main drivers of productivity and nutrient cycling in the ocean. We present a combined approach assessing C and N uptake and microbial community diversity across ecological provinces in the Southern Ocean and southern Indian Ocean. Provinces showed distinct genetic fingerprints, but microbial activity varied gradually across regions, correlating with nutrient concentrations. Our study advances the biogeographic understanding of microbial diversity across C and N uptake regimes.
Nimrod Wieler, Tali Erickson Gini, Osnat Gillor, and Roey Angel
Biogeosciences, 18, 3331–3342, https://doi.org/10.5194/bg-18-3331-2021, https://doi.org/10.5194/bg-18-3331-2021, 2021
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Biological rock crusts (BRCs) are common microbial-based assemblages covering rocks in drylands. BRCs play a crucial role in arid environments because of the limited activity of plants and soil. Nevertheless, BRC development rates have never been dated. Here we integrated archaeological, microbiological and geological methods to provide a first estimation of the growth rate of BRCs under natural conditions. This can serve as an affordable dating tool in archaeological sites in arid regions.
Michal Elul, Maxim Rubin-Blum, Zeev Ronen, Itay Bar-Or, Werner Eckert, and Orit Sivan
Biogeosciences, 18, 2091–2106, https://doi.org/10.5194/bg-18-2091-2021, https://doi.org/10.5194/bg-18-2091-2021, 2021
Mindaugas Zilius, Irma Vybernaite-Lubiene, Diana Vaiciute, Donata Overlingė, Evelina Grinienė, Anastasija Zaiko, Stefano Bonaglia, Iris Liskow, Maren Voss, Agneta Andersson, Sonia Brugel, Tobia Politi, and Paul A. Bukaveckas
Biogeosciences, 18, 1857–1871, https://doi.org/10.5194/bg-18-1857-2021, https://doi.org/10.5194/bg-18-1857-2021, 2021
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In fresh and brackish waters, algal blooms are often dominated by cyanobacteria, which have the ability to utilize atmospheric nitrogen. Cyanobacteria are also unusual in that they float to the surface and are dispersed by wind-driven currents. Their patchy and dynamic distribution makes it difficult to track their abundance and quantify their effects on nutrient cycling. We used remote sensing to map the distribution of cyanobacteria in a large Baltic lagoon and quantify their contributions.
Saly Jaber, Muriel Joly, Maxence Brissy, Martin Leremboure, Amina Khaled, Barbara Ervens, and Anne-Marie Delort
Biogeosciences, 18, 1067–1080, https://doi.org/10.5194/bg-18-1067-2021, https://doi.org/10.5194/bg-18-1067-2021, 2021
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Our study is of interest to atmospheric scientists and environmental microbiologists, as we show that clouds can be considered a medium where bacteria efficiently degrade and transform amino acids, in competition with chemical processes. As current atmospheric multiphase models are restricted to chemical degradation of organic compounds, our conclusions motivate further model development.
Kahina Djaoudi, France Van Wambeke, Aude Barani, Nagib Bhairy, Servanne Chevaillier, Karine Desboeufs, Sandra Nunige, Mohamed Labiadh, Thierry Henry des Tureaux, Dominique Lefèvre, Amel Nouara, Christos Panagiotopoulos, Marc Tedetti, and Elvira Pulido-Villena
Biogeosciences, 17, 6271–6285, https://doi.org/10.5194/bg-17-6271-2020, https://doi.org/10.5194/bg-17-6271-2020, 2020
Romie Tignat-Perrier, Aurélien Dommergue, Alban Thollot, Olivier Magand, Timothy M. Vogel, and Catherine Larose
Biogeosciences, 17, 6081–6095, https://doi.org/10.5194/bg-17-6081-2020, https://doi.org/10.5194/bg-17-6081-2020, 2020
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The adverse atmospheric environmental conditions do not appear suited for microbial life. We conducted the first global comparative metagenomic analysis to find out if airborne microbial communities might be selected by their ability to resist these adverse conditions. The relatively higher concentration of fungi led to the observation of higher proportions of stress-related functions in air. Fungi might likely resist and survive atmospheric physical stress better than bacteria.
Yanhong Lu, Shunyan Cheung, Ling Chen, Shuh-Ji Kao, Xiaomin Xia, Jianping Gan, Minhan Dai, and Hongbin Liu
Biogeosciences, 17, 6017–6032, https://doi.org/10.5194/bg-17-6017-2020, https://doi.org/10.5194/bg-17-6017-2020, 2020
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Through a comprehensive investigation, we observed differential niche partitioning among diverse ammonia-oxidizing archaea (AOA) sublineages in a typical subtropical estuary. Distinct AOA communities observed at DNA and RNA levels suggested that a strong divergence in ammonia-oxidizing activity among different AOA groups occurs. Our result highlights the importance of identifying major ammonia oxidizers at RNA level in future studies.
Lisa Tanet, Séverine Martini, Laurie Casalot, and Christian Tamburini
Biogeosciences, 17, 3757–3778, https://doi.org/10.5194/bg-17-3757-2020, https://doi.org/10.5194/bg-17-3757-2020, 2020
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Bioluminescent bacteria, the most abundant light-emitting organisms in the ocean, can be free-living, be symbiotic or colonize organic particles. This review suggests that they act as a visual target and may indirectly influence the sequestration of biogenic carbon in oceans by increasing the attraction rate for consumers. We summarize the instrumentation available to quantify this impact in future studies and propose synthetic figures integrating these ecological and biogeochemical concepts.
Michael Lintner, Bianca Biedrawa, Julia Wukovits, Wolfgang Wanek, and Petra Heinz
Biogeosciences, 17, 3723–3732, https://doi.org/10.5194/bg-17-3723-2020, https://doi.org/10.5194/bg-17-3723-2020, 2020
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Foraminifera are unicellular marine organisms that play an important role in the marine element cycle. Changes of environmental parameters such as salinity or temperature have a significant impact on the faunal assemblages. Our experiments show that changing salinity in the German Wadden Sea immediately influences the foraminiferal community. It seems that A. tepida is better adapted to salinity fluctuations than H. germanica.
Kathrin Busch, Ulrike Hanz, Furu Mienis, Benjamin Mueller, Andre Franke, Emyr Martyn Roberts, Hans Tore Rapp, and Ute Hentschel
Biogeosciences, 17, 3471–3486, https://doi.org/10.5194/bg-17-3471-2020, https://doi.org/10.5194/bg-17-3471-2020, 2020
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Seamounts are globally abundant submarine structures that offer great potential to study the impacts and interactions of environmental gradients at a single geographic location. In an exemplary way, we describe potential mechanisms by which a seamount can affect the structure of pelagic and benthic (sponge-)associated microbial communities. We conclude that the geology, physical oceanography, biogeochemistry, and microbiology of seamounts are even more closely linked than currently appreciated.
Alexander Bratek, Justus E. E. van
Beusekom, Andreas Neumann, Tina Sanders, Jana Friedrich, Kay-Christian Emeis, and Kirstin Dähnke
Biogeosciences, 17, 2839–2851, https://doi.org/10.5194/bg-17-2839-2020, https://doi.org/10.5194/bg-17-2839-2020, 2020
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The following paper highlights the importance of benthic N-transformation rates in different sediment types in the southern North Sea as a source of fixed nitrogen for primary producers and also as a sink of fixed nitrogen. Sedimentary fluxes of dissolved inorganic nitrogen support ∼7 to 59 % of the average annual primary production. Semi-permeable and permeable sediments contribute ∼68 % of the total benthic N2 production rates, counteracting eutrophication in the southern North Sea.
Sabine Haalboom, David M. Price, Furu Mienis, Judith D. L. van Bleijswijk, Henko C. de Stigter, Harry J. Witte, Gert-Jan Reichart, and Gerard C. A. Duineveld
Biogeosciences, 17, 2499–2519, https://doi.org/10.5194/bg-17-2499-2020, https://doi.org/10.5194/bg-17-2499-2020, 2020
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Mineral mining in deep-sea hydrothermal settings will lead to the formation of plumes of fine-grained, chemically reactive, suspended matter. Understanding how natural hydrothermal plumes evolve as they disperse from their source, and how they affect their surrounding environment, may help in characterising the behaviour of the diluted part of mining plumes. The natural plume provided a heterogeneous, geochemically enriched habitat conducive to the development of a distinct microbial ecology.
Noelle A. Held, Eric A. Webb, Matthew M. McIlvin, David A. Hutchins, Natalie R. Cohen, Dawn M. Moran, Korinna Kunde, Maeve C. Lohan, Claire Mahaffey, E. Malcolm S. Woodward, and Mak A. Saito
Biogeosciences, 17, 2537–2551, https://doi.org/10.5194/bg-17-2537-2020, https://doi.org/10.5194/bg-17-2537-2020, 2020
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Trichodesmium is a globally important marine nitrogen fixer that stimulates primary production in the surface ocean. We surveyed metaproteomes of Trichodesmium populations across the North Atlantic and other oceans, and we found that they experience simultaneous phosphate and iron stress because of the biophysical limits of nutrient uptake. Importantly, nitrogenase was most abundant during co-stress, indicating the potential importance of this phenotype to global nitrogen and carbon cycling.
Helmke Hepach, Claire Hughes, Karen Hogg, Susannah Collings, and Rosie Chance
Biogeosciences, 17, 2453–2471, https://doi.org/10.5194/bg-17-2453-2020, https://doi.org/10.5194/bg-17-2453-2020, 2020
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Tropospheric iodine takes part in numerous atmospheric chemical cycles, including tropospheric ozone destruction and aerosol formation. Due to its significance for atmospheric processes, it is crucial to constrain its sources and sinks. This paper aims at investigating and understanding features of biogenic iodate-to-iodide reduction in microalgal monocultures. We find that phytoplankton senescence may play a crucial role in the release of iodide to the marine environment.
Roger D. Finlay, Shahid Mahmood, Nicholas Rosenstock, Emile B. Bolou-Bi, Stephan J. Köhler, Zaenab Fahad, Anna Rosling, Håkan Wallander, Salim Belyazid, Kevin Bishop, and Bin Lian
Biogeosciences, 17, 1507–1533, https://doi.org/10.5194/bg-17-1507-2020, https://doi.org/10.5194/bg-17-1507-2020, 2020
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Effects of biological activity on mineral weathering operate at scales ranging from short-term, microscopic interactions to global, evolutionary timescale processes. Microorganisms have had well-documented effects at large spatio-temporal scales, but to establish the quantitative significance of microscopic measurements for field-scale processes, higher-resolution studies of liquid chemistry at local weathering sites and improved upscaling to soil-scale dissolution rates are still required.
Christine Rooks, James Kar-Hei Fang, Pål Tore Mørkved, Rui Zhao, Hans Tore Rapp, Joana R. Xavier, and Friederike Hoffmann
Biogeosciences, 17, 1231–1245, https://doi.org/10.5194/bg-17-1231-2020, https://doi.org/10.5194/bg-17-1231-2020, 2020
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Sponge grounds are known as nutrient sources, providing nitrate and ammonium to the ocean. We found that they also can do the opposite: in six species from Arctic and North Atlantic sponge grounds, we measured high rates of denitrification, which remove these nutrients from the sea. Rates were highest when the sponge tissue got low in oxygen, which happens when sponges stop pumping because of stress. Sponge grounds may become nutrient sinks when exposed to stress.
Cheng Li, Clare E. Reimers, and Yvan Alleau
Biogeosciences, 17, 597–607, https://doi.org/10.5194/bg-17-597-2020, https://doi.org/10.5194/bg-17-597-2020, 2020
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Novel filamentous cable bacteria that grow in the top layer of intertidal mudflat sediment were attracted to electrodes poised at a positive electrical potential. Several diverse morphologies of Desulfobulbaceae filaments, cells, and colonies were observed on the electrode surface. These observations provide information to suggest conditions that will induce cable bacteria to perform electron donation to an electrode, informing future experiments that culture cable bacteria outside of sediment.
Marie Maßmig, Jan Lüdke, Gerd Krahmann, and Anja Engel
Biogeosciences, 17, 215–230, https://doi.org/10.5194/bg-17-215-2020, https://doi.org/10.5194/bg-17-215-2020, 2020
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Little is known about the rates of bacterial element cycling in oxygen minimum zones (OMZs). We measured bacterial production and rates of extracellular hydrolytic enzymes at various in situ oxygen concentrations in the OMZ off Peru. Our field data show unhampered bacterial activity at low oxygen concentrations. Meanwhile bacterial degradation of organic matter substantially contributed to the formation of the OMZ.
Anna T. Kunert, Mira L. Pöhlker, Kai Tang, Carola S. Krevert, Carsten Wieder, Kai R. Speth, Linda E. Hanson, Cindy E. Morris, David G. Schmale III, Ulrich Pöschl, and Janine Fröhlich-Nowoisky
Biogeosciences, 16, 4647–4659, https://doi.org/10.5194/bg-16-4647-2019, https://doi.org/10.5194/bg-16-4647-2019, 2019
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A screening of more than 100 strains from 65 different species revealed that the ice nucleation activity within the fungal genus Fusarium is more widespread than previously assumed. Filtration experiments suggest that the single cell-free Fusarium IN is smaller than 100 kDa (~ 6 nm) and that aggregates can be formed in solution. Exposure experiments, freeze–thaw cycles, and long-term storage tests demonstrate a high stability of Fusarium IN under atmospherically relevant conditions.
Qing Wang, Renbin Zhu, Yanling Zheng, Tao Bao, and Lijun Hou
Biogeosciences, 16, 4113–4128, https://doi.org/10.5194/bg-16-4113-2019, https://doi.org/10.5194/bg-16-4113-2019, 2019
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We investigated abundance, potential activity, and diversity of soil ammonia-oxidizing archaea (AOA) and bacteria (AOB) in five Antarctic tundra patches, including penguin colony, seal colony, and tundra marsh. We have found (1) sea animal colonization increased AOB population size.; (2) AOB contributed to ammonia oxidation rates more than AOA in sea animal colonies; (3) community structures of AOB and AOA were closely related to soil biogeochemical processes associated with animal activities.
Yalda Vasebi, Marco E. Mechan Llontop, Regina Hanlon, David G. Schmale III, Russell Schnell, and Boris A. Vinatzer
Biogeosciences, 16, 1675–1683, https://doi.org/10.5194/bg-16-1675-2019, https://doi.org/10.5194/bg-16-1675-2019, 2019
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Ice nucleation particles (INPs) help ice form at temperatures as high as −4 °C and contribute to the formation of precipitation. Leaf litter contains a high concentration of INPs, but the organisms that produce them are unknown. Here, we cultured two bacteria and one fungus from leaf litter that produce INPs similar to those found in leaf litter. This suggests that leaf litter may be an important habitat of these organisms and supports a role of these organisms as producers of atmospheric INPs.
Nimrod Wieler, Hanan Ginat, Osnat Gillor, and Roey Angel
Biogeosciences, 16, 1133–1145, https://doi.org/10.5194/bg-16-1133-2019, https://doi.org/10.5194/bg-16-1133-2019, 2019
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In stony deserts, when rocks are exposed to atmospheric conditions, they undergo weathering. The cavernous (honeycomb) weathering pattern is one of the most common, but it is still unclear exactly how it is formed. We show that microorganisms, which differ from the surrounding soil and dust, form biological crusts on exposed rock surfaces. These microbes secrete polymeric substances that mitigate weathering by reducing evaporation rates and, consequently, salt transport rates through the rock.
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Short summary
This study focuses on the chemical reaction between Fe(II) and nitrite, which has been reported to produce high levels of the greenhouse gas N2O. We investigated the extent to which dead biomass and Fe(II) minerals might enhance this reaction. Here, nitrite reduction was highest when both additives were present but less pronounced if only Fe(II) minerals were added. Both reaction systems show distinct differences, rather low N2O levels, and indicated the abiotic production of N2.
This study focuses on the chemical reaction between Fe(II) and nitrite, which has been reported...
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