Article
Engineering, Marine
Michael S. Owens, Stephen P. Kelly, Thomas A. Frankovich, David T. Rudnick, James W. Fourqurean, Jeffrey C. Cornwell
Summary: The study estimated the net exchange of nitrogen and phosphorus species in estuarine lakes, revealing high efflux of NH4+ in dark conditions and significantly decreased efflux in light conditions. The presence of Chara hornemannii Wallman was found to have a large impact on NH4+ efflux, and it is expected that increased freshwater flow from the Everglades will influence NH4+ release in lakes.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Mingyue Li, Anqi Fang, Xiaoli Yu, Keke Zhang, Zhili He, Cheng Wang, Yisheng Peng, Fanshu Xiao, Tony Yang, Wei Zhang, Xiafei Zheng, Qiuping Zhong, Xingyu Liu, Qingyun Yan
Summary: Microbially-driven sulfur cycling is a critical biogeochemical process in sulfur-rich mangrove ecosystems. This study reveals the diversity, composition, and structure of sulfur-oxidizing bacteria (SOB) and sulfate-reducing bacteria (SRB) in mangrove sediments, highlighting the important role of temperature, redox potential, and key factors like elemental sulfur and total carbon in influencing these microbial communities. Additionally, the morphological transformation of sulfur compounds explains the variations in sulfur cycling microbial communities, with specific dominant genus identified in different mangrove species. These findings shed light on the sulfur cycling dynamics in mangrove ecosystems and offer insights for similar wetland ecosystems from a microbial perspective.
Article
Environmental Sciences
Elena Gazzano, Jasmine Rita Petriglieri, Elisabetta Aldieri, Bice Fubini, Christine Laporte-Magoni, Cristina Pavan, Maura Tomatis, Francesco Turci
Summary: Exposure to asbestos and asbestos-like minerals is associated with severe lung diseases. The study investigated the toxicity and cellular effects of fibrous antigorites on murine macrophages and alveolar epithelial cells. The findings revealed significant cellular toxicity of fibrous antigorites, which correlated with their fibrous habit and surface reactivity.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Medicinal
Jian Cai, Xueni Wang, Xia Gan, Qian Zhou, Xiaowei Luo, Bin Yang, Yonghong Liu, Disna Ratnasekera, Xuefeng Zhou
Summary: Two new chlorinated metabolites and eight known compounds were isolated from the fungus Mollisia sp. SCSIO41409 derived from mangrove sediments. Their structures were identified through physical and chemical analysis. The antimicrobial and antiproliferative activities of the compounds were evaluated, and stemphone C (4) showed potential as an antiproliferative agent and anti-prostate cancer lead compound.
Article
Forestry
Arian L. D. Paul, Sandrine Q. Isnard, Francis Brearley, Guillaume D. Echevarria, Alan J. M. Baker, Peter Erskine, Antony van der Ent
Summary: This study reveals the cycling of nutrients in ultramafic rain forests in New Caledonia. Most of the magnesium is found in the soil, while a portion of calcium and phosphorus, as well as the majority of potassium, is contained in the plant biomass. This study is essential for the restoration of rain forests in New Caledonia.
FOREST ECOLOGY AND MANAGEMENT
(2022)
Article
Geochemistry & Geophysics
Michel Cathelineau, Marie-Christine Boiron, Jean-Louis Grimaud, Sylvain Favier, Yoram Teitler, Fabrice Golfier
Summary: Silicification in pseudo-karsts developed on peridotite in New Caledonia was studied using delta O-18 and delta Si-30 pairs on quartz cements. The results showed that the development of pseudo-karsts and cementation occurred after the supergene alteration and lateritic weathering of peridotites in the Eocene. River incision resulted in the formation of a pseudo-karst system with dissolution pipes along pre-existing faults. Quartz and pimelite precipitation was driven by evaporation during drier climatic episodes.
Article
Engineering, Environmental
Adam J. Williamson, Jonathan R. Lloyd, Christopher Boothman, Gareth T. W. Law, Samuel Shaw, Joe S. Small, Gianni F. Vettese, Heather A. Williams, Katherine Morris
Summary: This study investigated the biogeochemical processes of Tc in high pH, cementitious environments. The findings suggest that both biological and abiotic reduction play important roles in Tc removal in these environments.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Geochemistry & Geophysics
Aurelie Boula, Christine Laporte-Magoni, Peggy Gunkel-Grillon, Olivier Bour, Nazha Selmaoui-Folcher
Summary: This study found that erosion from an old mine exacerbated sediment transport, leading to elevated concentrations of specific metals in surface waters. As a result, Cr, As, Si, Mg, and Al were identified as discriminating markers for total concentrations.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2022)
Article
Ecology
Min Wang, Yuxin Sun, Huixian Zeng, Wenkun Wu, Lifang Deng, Panfeng Tu
Summary: This study investigated the distribution of black carbon (BC) in mangrove sediments in China and its environmental implications. The results showed that sediments from the Hainan Province had higher BC content, with significant enrichment in the size fractions 0.053-0.25 mm and 0.25-2 mm. There was no significant difference in BC distribution between different sampling sites, and BC mainly originated from the combustion of biomass and minerals.
FRONTIERS IN FORESTS AND GLOBAL CHANGE
(2022)
Article
Environmental Sciences
Jianfei Chen, Tianli Tong, Yuyin Yang, Yanchu Ke, Xiuli Chen, Shuguang Xie
Summary: This study identified the microorganisms involved in BPA metabolism in mangrove sediments using DNA-based stable isotope probing. Five bacterial genera were found to be associated with BPA degradation, and the in-situ BPA degraders varied between mudflat and forest sediments. Functional gene analysis also showed that genes related to cytochrome P450, benzoate degradation, bisphenol degradation, and citrate cycle were up-regulated in the in-situ BPA-degrading microbes.
ENVIRONMENTAL RESEARCH
(2022)
Article
Ecology
Cui-Jing Zhang, Yu-Rong Liu, Guihong Cha, Yang Liu, Xin-Quan Zhou, Zhongyi Lu, Jie Pan, Mingwei Cai, Meng Li
Summary: Methylmercury (MeHg) is a potent neurotoxin that bioaccumulates along food chains. The diversity and distribution of putative microbial Hg-methylators in mangrove ecosystems were investigated using metagenomic and metatranscriptomic analyses. Asgard archaea, including Lokiarchaeota, were identified as potential novel Hg-methylating microorganisms. These findings suggest the important role of Asgard archaea in hgcA evolution and MeHg production.
Article
Microbiology
Jie Wu, Wu Qu, Qiliang Lai, Shengxiang Pei, Tianyou Zhang, Yan Zhuang, Zhuhua Chan, Runying Zeng
Summary: A novel bacterial strain named Vibrio ziniensis sp. nov. was isolated from mangrove sediments in Zhangzhou City, PR China, showing distinct characteristics from other Vibrio species, with a genome containing genes involved in the biosynthesis of various compounds.
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
(2021)
Article
Environmental Sciences
Chenyao Ding, Meng Jiao, Yijin Wang, Zuofang Yao, Tiezhu Li, Wenhuan Wang, Shaoheng Cao, Ruilong Li, Yinghui Wang
Summary: This study investigated the spatial distribution and factors influencing microplastics (MPs) in surface sediments of plantation mangrove forests for the first time. The results showed that plantation forests had lower abundance of MPs, especially fibrous MPs, compared to natural forests. The abundance of MPs was strongly related to sand content and Aegi-ceras corniculata biomass.
Article
Environmental Sciences
Xiaoyong Zhang, Zihui Chen, Youkai Yu, Zhiying Liu, Li Mo, Zuwang Sun, Zhongmei Lin, Jun Wang
Summary: The study found that different metals and organic matter fractions had varied effects on bacterial communities in mangrove sediments, with some metals and organic matter fractions showing significant positive correlations with specific genera of bacteria and significant negative correlations with others.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Multidisciplinary Sciences
Camille Bihanic, Eddy Petit, Roseline Perrot, Lucie Cases, Armelle Garcia, Franck Pelissier, Cyril Poullain, Camille Rivard, Martine Hossaert-McKey, Doyle McKey, Claude Grison
Summary: The New Caledonian endemic Mn-hyperaccumulator Grevillea meisneri is a useful species for preparing ecocatalysts, containing Mn-Ca oxides that are hard to synthesize under laboratory conditions. The study found strong positive correlations between Mn and Ca concentrations in tissues of G. meisneri, which might facilitate the formation of mixed Ca-Mn oxides. The successful use of G. meisneri in site rehabilitation and ecocatalyst biomass production was demonstrated, with transplanted nursery-grown seedlings accumulating Mn and sequestering it in the same tissues as spontaneously growing plants.
SCIENTIFIC REPORTS
(2021)
Article
Microbiology
A. Gorlas, T. Mariotte, L. Morey, C. Truong, S. Bernard, J-M Guigner, J. Oberto, F. Baudin, G. Landrot, C. Baya, P. Le Pape, G. Morin, P. Forterre, F. Guyot
Summary: Thermococcales, a major order of archaea inhabiting hydrothermal deep-sea vents, have the ability to rapidly produce iron sulfide. This process is dependent on the presence of zero-valent sulfur and results in cell mortality, but also allows for the growth of new cells. This suggests that biologically induced mineralization of iron-sulfides could be a survival strategy employed by Thermococcales in high-temperature hydrothermal environments.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Geochemistry & Geophysics
Beatrix M. Heller, Silvana Bressan Riffel, Thierry Allard, Guillaume Morin, Jean-Yves Roig, Renaud Coueffe, Geoffrey Aertgeerts, Alexis Derycke, Claire Ansart, Rosella Pinna-Jamme, Cecile Gautheron
Summary: The dynamics of tropical weathering through time and its association with climatic and geodynamic forcing in the formation of laterite and its long-term evolution are studied. The study focuses on lateritic-bauxitic duricrusts from Kaw mountain in French Guiana and investigates their mineralogy, geochemistry, and (U-Th)/He geochronology. The results reveal the heterogeneity in the formation and evolution of duricrust through processes of dissolution and (re)precipitation of Fe (oxyhydr)oxides. The intensification of weathering and shift towards bauxitic conditions since the end of the Miocene are indicated by the dissolution and (re)precipitation of Fe minerals, Al-substitution in goethite, and the overall enrichment in Th. The study proposes a model of lateritization since at least 30 Ma and bauxitization since the late Miocene, providing new insights into the timescale and intensity of weathering in the region.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Guillaume Wattelez, Cecile Dupouy, Farid Juillot
Summary: This article demonstrates the application of unsupervised clustering methods to classify seabed colors in the shallow waters of a tropical oligotrophic lagoon in New Caledonia using Sentinel-2 images. Standardization of data improves the accuracy of the method and highlights its relevance and robustness in optically complex shallow settings.
Article
Geochemistry & Geophysics
Jeremie Aubineau, Fleurice Parat, Abdellatif Elghali, Otmane Raji, Aissam Addou, Clement Bonnet, Manuel Munoz, Olivia Mauguin, Fabien Baron, Moulay Brahim Jouti, Oussama Khadiri Yazami, Jean-Louis Bodinier
Summary: Phosphorus in Moroccan phosphate minerals occurs mainly as microcrystalline carbonate fiuorapatite (CFA) and shows heterogeneous CO32- content at both regional and grain scales. The variations in CO32- content between phosphate basins are likely related to depositional conditions, highlighting the importance of studying the impact of CO32- on grain morphology for potential applications in long-term soil fertilization.
Article
Ecology
Hamid Amir, Laurent Bordez, Yvon Cavaloc, Philippe Jourand, Marc Ducousso, Farid Juillot
Summary: Ecological restoration is considered the best solution for mining-degraded areas, especially valuable ecosystems. However, the storage of topsoil can negatively affect soil fertility and microbial diversity. This study examined the evolution of topsoils stored in piles on mined areas and found that storage duration, depth, and topsoil origin all influenced microbial, fungal, and physical properties of the soil. The findings highlight the importance of minimizing stockpiling duration and reducing pile height to ensure successful ecosystem restoration.
ECOLOGICAL ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
F. Locati, G. Collo, L. Madsen, M. Munoz, S. Marfil, P. Maiza
Summary: This study aims to investigate the local alteration process of basalts from the province of Corrientes and propose an alteration sequence. It was found that secondary products formed by the interaction of the rock and hydrothermal fluids at temperatures likely < -100°C-150°C. Different alteration stages were determined, with swelling clay minerals, iron oxides, calcite, and silica identified as the main alteration phases. These findings contribute to a better understanding of the alteration process of basalts.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Vincent Noel, Jennifer L. Druhan, Asli Gundogar, Anthony R. Kovscek, Gordon E. Brown Jr, John R. Bargar
Summary: This study investigates the impact of carbonate mineral content on fluid transport and chemical reactions in shale formations during hydraulic fracturing. The results show that the calcite content directly affects the rate and spatial extent of fluid transport and matrix alteration, highlighting the importance of understanding the HFF-calcite reaction rates for optimizing hydraulic fracturing.
APPLIED GEOCHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Farid Juillot, Michael Meyer, Thomas Quiniou, Magali David, Philippe Jourand, Marc Ducousso, Emmanuel Fritsch, Gael Thery
Summary: In the context of global warming, wildfires are having an increasing impact on continental ecosystems, including enhancing trace metals concentration in freshwater systems. This study focused on assessing the risk of chromium (Cr) pollution in New Caledonia due to soil heating during wildfires. The results showed that soil heating increased the mobility of Cr(VI), with a marked turnaround at 400 degrees C. Additionally, the study revealed the importance of the Fe-oxides/silicates ratio on Cr(VI) mobility. The findings highlight the need for further evaluation of the risk of wildfires-induced freshwater Cr(VI) pollution in different pedological settings worldwide.
APPLIED GEOCHEMISTRY
(2023)
Article
Geochemistry & Geophysics
F. Juillot, V. Noel, P. Louvat, A. Gelabert, D. Jouvin, J. Goettlicher, S. Belin, B. Mueller, G. Morin, A. Voegelin
Summary: This study traced the speciation and isotopic composition of Zn in the sediments of a freshwater lake that underwent strong eutrophication for one hundred years, in order to assess the potential use of sedimentary Zn isotopes in recording such environmental disturbances. The results showed that the sedimentary Zn isotope signal varied as the lake transitioned from pre-eutrophic to eutrophic conditions. A change in Zn speciation from clay minerals to ZnS was observed, along with a depletion of light Zn in the eutrophic sediments. This is attributed to enhanced biological uptake of light Zn in the water column and subsequent transformation into ZnS during early diagenesis. The study highlights the potential of sedimentary Zn isotopes as indicators of past eutrophic periods in freshwater lakes and their ability to provide insights into paleo-environmental conditions and land use.
Article
Chemistry, Physical
Guillaume Morin, Frederic Averseng, Xavier Carrier, Pierre Le Pape, Yishan Du, Yusheng HongE, Elora Bourbon, Giuseppe Sportelli, Tiago A. Da Silva, Alberto Mezzetti, Camille Baya, Thierry Allard, Jessica Brest, Maryse Rouelle
Summary: Heterogeneous Fenton-like reactions using O-2 as the sole oxidant have gained attention for organic contaminant degradation in soils and groundwaters. The reactive species produced upon air oxidation of Fe-(II)-bearing oxide and sulfide mineral phases may deserve further research.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Geology
Pan -Pan Niu, Shao-Yong Jiang, Manuel Munoz
Summary: The Maoping Pb-Zn deposit in southwest China is a major germanium producer. The mineralization process can be divided into three stages, with C5 and C1 sphalerites having the highest germanium contents. Fluids from the Zaige and Baizuo Formations, mixed with metal-bearing basin brine, caused the first-stage germanium enrichment in C1, C2, C3, and C4 sphalerites, while fluids from the Datang Formation led to the second-stage enrichment of germanium in C5 sphalerite.
ORE GEOLOGY REVIEWS
(2023)
Article
Engineering, Environmental
Maya Engel, Vincent Noel, Samuel Pierce, Libor Kovarik, Ravi K. Kukkadapu, Juan S. Lezama Pacheco, Odeta Qafoku, J. Ray Runyon, Jon Chorover, Weijiang Zhou, John Cliff, Kristin Boye, John R. Bargar
Summary: Fe-rich mobile colloids are important but poorly understood in the biogeochemical cycling of Fe in groundwater. This study provides comprehensive information on the sizes, molecular structures, and compositions of Fe-rich mobile colloids in anoxic groundwater from a redox-active floodplain. The mobile colloids consist of Si-coated ferrihydrite nanoparticles and Fe(II)-OM complexes, which can persist under both oxic and anoxic conditions. These findings shed new light on the potential of mobile Fe-rich colloids to transport Fe, OM, and nutrients across terrestrial-aquatic interfaces.
Article
Chemistry, Multidisciplinary
Pierre Lefebvre, Arnaud Mangeret, Alkiviadis Gourgiotis, Pascale Louvat, Pierre Le Pape, Pierre Sabatier, Olivier Diez, Charlotte Cazala, Jerome Gaillardet, Guillaume Morin
Summary: Understanding the U cycle at the watershed scale is crucial for managing contaminated areas and conducting research on ore formation processes and paleoenvironments. Through chemical, isotopic, and speciation analyses, we investigated the U cycle in the U-rich Lake Negre watershed in France. Our findings reveal that U(VI) originates from U-rich rock fractures and is transported in dissolved forms, with wetlands and meadow soils acting as intermediate sinks. Additionally, U is supplied to the lake through physical erosion of soil, and sedimentation in the lake reduces U(VI) to U(IV), resulting in high sedimentary U concentrations.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Environmental Sciences
Fatima Akfas, Abdellatif Elghali, Jean-Louis Bodinier, Fleurice Parat, Manuel Munoz
Summary: Phosphoric acid manufacturing generates large amounts of phosphogypsum (PG), a by-product generally disposed without any pretreatment. Phosphogypsum may contain valuable elements such as rare earth elements (REEs). This study aims to evaluate the trace element release rate from PG under atmospheric conditions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Eleanor Spielman-Sun, Garret Bland, Jonas Wielinski, Laura Froute, Anthony R. Kovscek, Gregory Lowry, John R. Bargar, Vincent Noel
Summary: This study aims to understand the geochemical changes of the host rock and the formation and migration of colloids in response to reservoir stimulation. The results show that the solution pH plays an important role in the formation and migration of colloids. It was found that extensive mineral dissolution and secondary precipitation occurred in the low pH solution, and iron colloids coexisted with silicates. Chromium and nickel were also detected with these iron colloids in the bulk fluid.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)