Article
Microbiology
Kaitlin R. Rempfert, Daniel B. Nothaft, Emily A. Kraus, Ciara K. Asamoto, R. Dave Evans, John R. Spear, Juerg M. Matter, Sebastian H. Kopf, Alexis S. Templeton
Summary: Nitrogen is an essential element for life, and its availability and forms in subsurface ecosystems, especially serpentinite-hosted settings, are not well understood. This study analyzed nitrogen and oxygen isotopes to investigate the source, abundance, and cycling of nitrogen species in the Samail Ophiolite of Oman. The results reveal the dominant dissolved nitrogen species and provide insights into the microbial life and nitrogen cycling in serpentinite environments.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Engineering, Environmental
Yaojin Xiong, Yao Du, Yamin Deng, Teng Ma, Yanxin Wang
Summary: Groundwater nitrogen contamination is a growing concern worldwide. This study provides evidence of the occurrence of Feammox in groundwater and identifies the key microbial and environmental factors associated with this process.
Article
Environmental Sciences
Kalina C. Grabb, Shuai Ding, Xiaoyan Ning, Su Mei Liu, Bao Qian
Summary: The study investigated the changes in nitrogen sources and cycling in the Three Gorges Reservoir and downstream the Changjiang, finding that the construction of the Three Gorges Dam and anthropogenic inputs have impacted the ecosystem, highlighting the significant influence of pollution sources on nitrogen cycling.
ENVIRONMENTAL RESEARCH
(2021)
Article
Environmental Sciences
Jun-Peng Jiang, Shuang Leng, Yi-Fan Liao, Xuan Liu, Dong-Xu Li, Chen Chu, Xiang-Yang Yu, Chang-Hong Liu
Summary: This study found that almost all fungi possess anaerobic denitrification, dissimilatory nitrate reduction to ammonium (DNRA), and nitrification pathways, but not anaerobic ammonium oxidation (anammox). The distribution of fungi with different nitrogen-conversion abilities in subseafloor sediments was mainly determined by in situ temperature, CaCO3, and inorganic carbon contents. These findings suggest that fungi have multiple nitrogen transformation processes to cope with their requirements for a variety of nitrogen sources in nutrient deficient anaerobic subseafloor sedimentary environments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Hong-Duck Ryu, Sun-Jung Kim, Un-il Baek, Deok-Woo Kim, Hyun-Jeoung Lee, Eu Gene Chung, Min-Seob Kim, Kyunghyun Kim, Jae Kwan Lee
Summary: A novel approach using dual ammonium and nitrate nitrogen isotope ratios was proposed to identify nitrogen sources in intensive livestock farming watersheds, showing that seasonal patterns of delta N-15(NH4) and delta N-15(NO3) can reflect nitrogen pollution from agricultural activities. The study revealed that microbial nitrification is the dominant nitrogen transformation process in the river, and the dual delta N-15(NH4) and delta N-15(NO3) axes provide better results compared to traditional methods for identifying nitrogen sources in agricultural watersheds with swine excreta treatment facilities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
Yangjun Chen, Min Chen
Summary: The primary nitrite maximum (PNM) is a characteristic feature of the oceanic nitrogen cycle, but its characterization worldwide is lacking. Using the natural abundance of NO2- isotopes and a geochemical model, this study reveals that ammonia oxidation dominates the formation of PNM in the Arctic and subarctic waters, while the oxidation of NO2- is the main sink. The oxidation of NO2- plays a more important role in Arctic and subarctic waters compared to low- and mid-latitude waters. The residence time of NO2- in the PNM suggests a more dynamic NO2- cycle in the Arctic Ocean ecosystem. These findings provide insights into the nitrogen cycle dynamics in the upper Arctic Ocean ecosystem.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Review
Microbiology
Andreas Kappler, Casey Bryce, Muammar Mansor, Ulf Lueder, James M. Byrne, Elizabeth D. Swanner
Summary: The biogeochemical cycling of iron plays a crucial role in environmental processes such as ocean productivity, carbon storage, greenhouse gas emissions, and nutrient and contaminant fate. Recent studies have uncovered novel processes in the biogeochemical iron cycle and shown that oxidation and reduction of iron occur cyclically or simultaneously in many environments.
NATURE REVIEWS MICROBIOLOGY
(2021)
Review
Microbiology
Jean-Baptiste Ramond, Karen Jordaan, Beatriz Diez, Sandra M. Heinzelmann, Don A. Cowan
Summary: Arid ecosystems cover a significant portion of the Earth's terrestrial surface and contribute to the global nitrogen pool. These ecosystems are characterized by extreme conditions that limit the presence of macrofauna and flora and hinder plant growth and productivity. Microbes play a crucial role in the nitrogen cycling processes that drive primary production and nutrient biogeochemical cycling in these ecosystems. This survey provides insights into the current understanding of microbial-mediated nitrogen processes in different edaphic and refuge niches in arid environments.
MICROBIOLOGY AND MOLECULAR BIOLOGY REVIEWS
(2022)
Article
Environmental Sciences
Yaojin Xiong, Yao Du, Yamin Deng, Teng Ma, Dian Li, Xiaoliang Sun, Guangning Liu, Yanxin Wang
Summary: This study used multiple stable isotopes and spectral characteristics of DOM to investigate the sources and fate of nitrate and ammonium in groundwater in the Central Yangtze River Basin. Different hydrogeological conditions were found to control the behavior of nitrogen compounds in three subareas, leading to contrasting patterns of nitrogen sources and fate.
ENVIRONMENTAL POLLUTION
(2021)
Review
Environmental Sciences
Lin Yang, Ben Yu, Deming Han, Kun Zhang, Hongwei Liu, Cailing Xiao, Ligang Hu, Yongguang Yin, Jianbo Shi, Guibin Jiang
Summary: The oceans are important reservoirs of mercury (Hg) and have a significant role in the global biogeochemical cycling of Hg. Understanding the mechanisms of Hg cycling in marine ecosystems is crucial for assessing its risks to wildlife and humans. The stable Hg isotope technique is a powerful tool for studying Hg sources and processes. This review summarizes recent advances in marine Hg biogeochemical cycling from an isotopic tracing perspective, including sources of marine Hg, isotopic fingerprints, and applications in understanding pathways, transport, and transformation mechanisms in marine environments.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Hiroto Kawashima, Otoha Yoshida, Nana Suto
Summary: This study measured the stable nitrogen isotope ratios of NH4+ in PM2.5 at a suburban site and a rural site in Japan, and identified the sources of NH4+ using isotopic mixing models. The results showed that nonagricultural sources contributed significantly to NH4+ at both sites, and the contribution of nonagricultural sources to NH3 was higher than that of agricultural sources.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Young-Jae Jeong, Bo-Seong Seo, Nuri Baek, Jin-Hyeob Kwak, Sang-Mo Lee, Hyun-Jin Park, Woo-Jung Choi
Summary: This study proposed methods for determining the δN-15 of multiple nitrogen species. The methods included traditional distillation, direct evaporation, and isotope mass balance equation. The accuracy and precision of the methods were evaluated through a series of experiments, and the influences of different conditions on the analysis results were assessed.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Geochemistry & Geophysics
Marie-Noelle Decraene, Johanna Marin-Carbonne, Christophe Thomazo, Nicolas Olivier, Pascal Philippot, Harald Strauss, Etienne Deloule
Summary: Iron isotope compositions of sedimentary pyrites are used to study the redox evolution of the Precambrian ocean and early Fe-based metabolisms. The study on micropyrites from stromatolites in the Tumbiana Formation reveals a complex two-step iron cycling process, including partial Fe oxidation followed by microbially induced Fe reduction, contributing to the understanding of Archean microbial ecosystems and biogeochemical cycles.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Review
Environmental Sciences
Jiaxuan Zhu, Tian Li, Chengmei Liao, Nan Li, Xin Wang
Summary: Ammonium is a common form of nitrogen in wastewater, and new technologies are needed to effectively remove it to prevent severe pollution. Feammox, known as anaerobic ammonium oxidation coupled to Fe(III) reduction, is an efficient and environmentally friendly method that can be combined with other nitrogen removal reactions for wastewater treatment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Ke Pan, Wenlu Lan, Tianshen Li, Ming Hong, Xiaoyan Peng, Zhifang Xu, Wenjing Liu, Hao Jiang
Summary: Although the role of oysters in remediating estuarine eutrophication has been controversial, this study found that oysters can effectively suppress phytoplankton blooms in a nutrient-enriched estuary, impacting pelagic nitrogen cycling significantly. The research provides implications for restoring oyster reefs to mitigate the symptoms of estuarine eutrophication.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Gabe S. Epstein, Gray E. Bebout, Samuel Angiboust, Philippe Agard
Article
Biology
Seth D. Newsome, Kelli L. Feeser, Christina J. Bradley, Caitlin Wolf, Cristina Takacs-Vesbach, Marilyn L. Fogel
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2020)
Article
Environmental Sciences
Lily A. Tomkovic, Edward S. Gross, Bobby Nakamoto, Marilyn L. Fogel, Carson Jeffres
Article
Geochemistry & Geophysics
E. Cannao, M. Scambelluri, G. E. Bebout, S. Agostini, T. Pettke, M. Godard, L. Crispini
Article
Ecology
Seth D. Newsome, Bobby J. Nakamoto, Mauriel Rodriguez Curras, Marilyn L. Fogel
Article
Geography, Physical
Jonathan W. Nye, Atilio Francisco J. Zangrando, Maria Paz Martinoli, Marilyn L. Fogel
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2020)
Article
Geosciences, Multidisciplinary
Nadine W. Gabriel, Dominic Papineau, Zhenbing She, Arne Leider, Marilyn L. Fogel
Summary: This study aims to investigate the mineralogy and organic geochemistry of well-preserved late Palaeoproterozoic stromatolitic dolomite from the McLeary Formation, and suggests that chemically oscillating reactions may influence the formation of diagenetic spheroids.
PRECAMBRIAN RESEARCH
(2021)
Review
Astronomy & Astrophysics
Ralf Halama, Gray Bebout
Summary: Understanding the Earth's geological nitrogen and carbon cycles is crucial for assessing their distribution between different Earth reservoirs. Variations in the fluxes of nitrogen and carbon through geological time have influenced Earth's evolution and atmosphere composition. Subduction zones play a key role in the transfer of nitrogen and carbon, with important implications for the Earth's mantle and atmosphere dynamics.
SPACE SCIENCE REVIEWS
(2021)
Article
Ecology
Emma A. Elliott Smith, Michael D. Fox, Marilyn L. Fogel, Seth D. Newsome
Summary: Carbon isotope fingerprinting using multivariate analysis has been applied in ecological studies to measure essential amino acids. This study evaluated the consistency in isotopic fingerprints among nearshore primary producers and identified the biochemical mechanisms driving these patterns. The results showed a high consistency in isotopic fingerprints of marine algae across space and time, with kelps and rhodophytes exhibiting distinct patterns. Taxonomy and site locality were found to be important determinants of individual amino acid delta C-13 values.
FUNCTIONAL ECOLOGY
(2022)
Article
Ecology
Kaycee E. Morra, Seth D. Newsome, Gary R. Graves, Marilyn L. Fogel
Summary: This study explores the variations in δH-2 in plant, herbivore, and herbivorous insect tissues through amino acid analysis, revealing extensive variation within and among individuals and the potential additional sources such as gut microbes contributing to these variations. Multiple isotopic carryover effects associated with metamorphosis were also found, highlighting the importance of physiological mechanisms in determining consumer-diet δH-2 discrimination.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2021)
Article
Geosciences, Multidisciplinary
Gray E. Bebout, Tsutomu Ota, Takuya Kunihiro, William D. Carlson, Eizo Nakamura
Summary: The study investigated major- and trace-element concentrations and delta Li-7 in garnet in ultrahigh-pressure metasedimentary rocks, revealing strong zoning and enrichment of HREEs, Y, and Li in cores and growth annuli, potentially linked to reactions involving titanite breakdown. This work highlights the importance of measuring garnet compositions in understanding devolatilization and mineral reactions during exhumation histories in high-pressure metamorphic rocks.
Article
Marine & Freshwater Biology
Sol Porcel, Marilyn L. Fogel, Irina Izaguirre, Ignacio Roesler, Julio L. Lancelotti
Summary: The introduction of rainbow trout in naturally fishless lakes in the reproductive area of the endangered Hooded Grebe has been found to impact the food web structure and carbon source utilization of the aquatic community. The presence of trout leads to an increase in trophic redundancy and changes in the spatial distribution and diet of the Grebe's main prey.
Article
Biology
Ileana Perez-Rodriguez, Stefan M. Sievert, Marilyn L. Fogel, Dionysis Foustoukos
Summary: We investigated the impact of pressure on thermophilic, chemolithoautotrophic NO3- reducing bacteria isolated from deep-sea hydrothermal vents. Results showed that higher pressure resulted in decreased NO3- consumption, lower cell concentrations, and slower growth. However, nitrogen isotope fractionation effects from the chemolithoautotrophic NO3- reduction were maintained under all pressure conditions. Comparisons between natural hydrothermal vent fluid microbial communities and laboratory isolates suggested similar chemolithoautotrophic NO3- reducing activities. Our results contribute to the understanding of the relationship between pressure, temperature, redox conditions, and anaerobic chemolithoautotrophic processes.
Article
Fisheries
Bobby J. Nakamoto, Carson A. Jeffres, Nicholas J. Corline, Mollie Ogaz, Christina J. Bradley, Joshua H. Viers, Marilyn L. Fogel
Summary: Using compound-specific isotope analysis, we determined the biosynthetic source of amino acids in fish from major tributaries to the Sacramento-San Joaquin river delta in California. Our findings confirm the importance of algae in floodplain food webs in California's Central Valley, while also identifying other sources of amino acids contributing to fish.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Soil Science
Michael V. Schaefer, Nathaniel A. Bogie, Daniel Rath, Alison R. Marklein, Abdi Garniwan, Thomas Haensel, Ying Lin, Claudia C. Avila, Peter S. Nico, Kate M. Scow, Eoin L. Brodie, William J. Riley, Marilyn L. Fogel, Asmeret Asefaw Berhe, Teamrat A. Ghezzehei, Sanjai Parikh, Marco Keiluweit, Samantha C. Ying
