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
Geosciences, Multidisciplinary
Zhong-Jun Wang, Fu-Jun Yue, Li-Li Xue, Yu-Chun Wang, Cai-Qing Qin, Jie Zeng, Hu Ding, Yu-Cong Fu, Si-Liang Li
Summary: A large amount of cropland in the Southwestern China karst area has been abandoned since the implementation of the Grain for Green project at the end of the last century, which significantly impacted the biogeochemistry cycle in soil. However, the effect of cropland abandonment on the soil nitrogen (N) cycle and the N loss process is still little understood. This study used N content and isotope analysis to assess karst soil's N fate and explore the N loss process in SW China.
Article
Environmental Sciences
Wei Guo, Li Luo, Zhongyi Zhang, Nengjian Zheng, Hongwei Xiao, Huayun Xiao
Summary: The study shows that nitrate in southern China, especially during warm months, is mainly derived from the OH radical pathway, while changes in formation pathways and isotopic composition are influenced by air pollution emissions. Higher isotopic values from NOx emissions in northern areas and during cold months lead to higher nitrate isotopic compositions.
ENVIRONMENTAL RESEARCH
(2021)
Article
Environmental Sciences
Anna Fadliah Rusydi, Shin-Ichi Onodera, Mitsuyo Saito, Fujio Hyodo, Morihiro Maeda, Khori Sugianti, Sunarya Wibawa
Summary: The study found that the sources of ammonium-nitrogen in Indonesian coastal groundwater include both natural origins, such as organic nitrogen mineralization, and anthropogenic origins, mainly from agricultural and residential waste. The presence of E. coli confirmed contamination from human and animal waste.
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)
Article
Environmental Sciences
Sabarathinam Chidambaram, Banajarani Panda, Tirumalesh Keesari, M. Prasanna, Dhiraj Kr Singh, A. L. Ramanathan
Summary: The dynamics of coastal aquifers can be understood through geochemical and isotopic signatures. In this study, groundwater recharge processes in coastal Tamil Nadu, South India were evaluated using major ion chemistry and environmental isotopes. The results showed that shallow groundwater had contributions from multiple recharge sources, while deeper groundwater was mainly recharged by precipitation. The isotopic variations in different areas indicated different sources and influences. The groundwater in the study area was found to be brackish to saline, with minor influence from anthropogenic activities.
MARINE POLLUTION BULLETIN
(2022)
Article
Engineering, Civil
Lu Yan, Xianjun Xie, James W. Heiss, Kang Peng, Yamin Deng, Yiqun Gan, Qinghua Li, Yanpeng Zhang
Summary: In this study, the sources, preservation, and degradation of sedimentary organic matter (SOM) in the Dongzhai Harbor estuary were investigated using stable isotopes, spectral techniques, and hydrogeochemical analysis. The results showed that aquaculture, C3 mangrove forests, and marine plankton were the main sources of SOM along the estuarine gradient. Moreover, the preservation and degradation of SOM were controlled by sedimentation, hydrodynamic conditions, and geochemical reactions. These findings contribute to a better understanding of SOM dynamics in estuarine mangrove ecosystems and have implications for their protection and management.
JOURNAL OF HYDROLOGY
(2023)
Article
Geochemistry & Geophysics
D. M. Nisson, T. L. Kieft, H. Drake, O. Warr, B. Sherwood Lollar, H. Ogasawara, S. M. Perl, B. M. Friefeld, J. Castillo, M. J. Whitehouse, E. Kooijman, T. C. Onstott
Summary: Geochemical and isotopic analyses were performed on hypersaline brines from the Moab Khotsong gold and uranium mine in the Witwatersrand Basin of South Africa to investigate brine evolution over time and evaluate habitability conditions. The results showed that the brines were highly saline and exhibited low dissolved inorganic carbon and high dissolved organic carbon pools. Radiolysis and water-rock interactions were identified as significant contributors to the brine chemistry, with radiolytic production of H2 and oxidant species supporting a potentially low biomass microbial community. The findings also revealed distinct fluid events during the cooling of the basin, as evidenced by stable isotopic signatures.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Wei Song, Xue-Yan Liu
Summary: In this study, concentrations and δ15N values of emitted NOx and NO3- from biomass burning were measured in northern China. The study filled the knowledge gap of species-specific δ15N signatures of NOx produced by biomass burning, expanded the understanding of N isotope fractionations during burning processes, and provided critical parameters for isotope source apportionment of NOx and NO3- in the atmosphere.
APPLIED GEOCHEMISTRY
(2023)
Article
Environmental Sciences
Sherry L. Martin, Quercus F. Hamlin, Anthony D. Kendall, Luwen Wan, David W. Hyndman
Summary: This study reveals the slow delivery process of nitrogen in groundwater over time, indicating that actions taken now may not show expected results for decades or even centuries. Differences in groundwater travel times create a heterogeneous patchwork, allowing managers to prioritize actions to best match their targeted response times. Agricultural practices are the main source of nitrogen contributions, but human contributions also play a role.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Mei Yan Lai, Thomas Stachel, Richard A. Stern, Kan Li, D. Graham Pearson, Jeff W. Harris
Summary: Through examining 16 diamonds with eclogitic garnet inclusions from the Koidu kimberlite complex in Sierra Leone, it was found that the garnet inclusions have high oxygen isotope values, indicating a link to protoliths that had undergone extensive low-temperature alteration by seawater. The carbon and nitrogen isotope compositions of the host diamonds suggest that diamond formation is associated with an external, mantle-derived fluid.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Environmental Sciences
Juanting Niu, Litang Hu, Jian Li, Jinsheng Wang, Shihang Yu
Summary: This study analyzed the influences of groundwater level recovery on the sources and transformation of nitrogen in groundwater using field data. It found that groundwater level recovery can lead to changes in NH4+ and NO3- concentrations in groundwater, and the processes vary at different depths.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Li-Li Han, Helin Wang, Lianghao Ge, Min Nina Xu, Jin-Ming Tang, Li Luo, Ping Li, Shuh-Ji Kao
Summary: Ammonium (NH4+) retention/removal processes in groundwater are important due to human activities increasing nitrogenous compound loading. However, the transformation processes determining NH4+ fate in groundwater under different redox conditions have not been well studied. In a high nitrogen groundwater system in China, NH4+ source and sink processes were identified and quantified, revealing the dominance of mineralization and nitrification in oxidizing zones, and anammox in reducing zones. The NH4+ production/consumption ratio increased downstream, indicating NH4+ accumulation in strongly reducing groundwater where aerobic conditions are lacking. These findings provide insights for understanding NH4+ dynamics and suggest mitigation techniques for groundwater NH4+.
Article
Engineering, Civil
Jie Li, Yulian Liu, Wei Dai, Jian Li, Pingheng Yang, Lijun Tian, Shihang Yu, Rui Zuo, Yuanzheng Zhai, Wei Song, Fan Yang, Ruijing Zhou, Shufang Wang
Summary: This study combines dual nitrate isotopes and microbial signatures to assess and quantify nitrate attenuation in the North China Plain. The results reveal significant denitrification using the dual nitrate isotopes on a temporal scale. High-throughput sequencing provides microbial evidence showing the relationship between the relative abundances of denitrification-related functional genes and nitrate concentration.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Chung-Mo Lee, Hanna Choi, Yongcheol Kim, MoonSu Kim, HyunKoo Kim, Se-Yeong Hamm
Summary: This study investigated the influence of land use types on nitrate-nitrogen contamination in groundwater in a typical rural area in South Korea. The findings showed that nitrate-nitrogen mainly originated from public facilities and livestock areas, with different land use types having distinct recharge routes for nitrate-nitrogen into the groundwater system. The shallow groundwaters in the study area were classified into three clusters based on their chemical constituents and land-use properties using SOM, PCA, and HCA.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Ian Paynter, Crystal Schaaf, Jennifer L. Bowen, Linda Deegan, Francesco Peri, Bruce Cook
Article
Geosciences, Multidisciplinary
Amanda C. Spivak, Jonathan Sanderman, Jennifer L. Bowen, Elizabeth A. Canuel, Charles S. Hopkinson
Article
Limnology
Ashley N. Bulseco, Joseph H. Vineis, Anna E. Murphy, Amanda C. Spivak, Anne E. Giblin, Jane Tucker, Jennifer L. Bowen
LIMNOLOGY AND OCEANOGRAPHY
(2020)
Article
Microbiology
Anna E. Murphy, Ashley N. Bulseco, Ross Ackerman, Joseph H. Vineis, Jennifer L. Bowen
ENVIRONMENTAL MICROBIOLOGY
(2020)
Article
Environmental Sciences
Christopher A. Lynum, Ashley N. Bulseco, Courtney M. Dunphy, Sean M. Osborne, Joseph H. Vineis, Jennifer L. Bowen
ESTUARIES AND COASTS
(2020)
Article
Biology
Jennifer L. Bowen, Anne E. Giblin, Anna E. Murphy, Ashley N. Bulseco, Linda A. Deegan, David S. Johnson, James A. Nelson, Thomas J. Mozdzer, Hillary L. Sullivan
Article
Biodiversity Conservation
Kerry L. McNally, Cody R. Mott, Jeffrey R. Guertin, Jennifer L. Bowen
Summary: This study characterized the microbiome of the oral cavity and cloaca from wild-captured Kemp's ridley and green turtles in the west coast of Florida, revealing distinct microbial communities between body sites and turtle species. The core microbiome of the green turtle cloaca was primarily from the order Clostridiales, highlighting the importance of the turtle species in determining the microbiome. High prevalence of fibropapillomatosis in green turtles was also investigated, with changes in beta diversity associated with the severity of tumors.
ENDANGERED SPECIES RESEARCH
(2021)
Article
Engineering, Environmental
Xuefeng Peng, Qixing Ji, John H. Angell, Patrick J. Kearns, Jennifer L. Bowen, Bess B. Ward
Summary: Salt marsh sediments are key sites for nitrogen cycling and a significant source of nitrous oxide (N2O) production and consumption. Fertilization can impact nitrogen dynamics, increasing the importance of nitrification in N2O production. Changes in specific substrate utilization rates reveal shifts in microbial community composition and functional gene expression in response to long-term fertilization.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Plant Sciences
Torrance C. Hanley, Jennifer L. Bowen, Patrick J. Kearns, A. Randall Hughes
Summary: Nutrient enrichment affects plant species and soil microbes, with enriched environments promoting higher plant productivity but plants with different population histories may exhibit varied responses.
JOURNAL OF ECOLOGY
(2021)
Article
Multidisciplinary Sciences
Kerry L. McNally, Charles J. Innis, Adam Kennedy, Jennifer L. Bowen
Summary: The microbial communities in the oral and cloacal samples of cold-stunned Kemp's ridley turtles were found to change significantly throughout the rehabilitation process, influenced by factors such as environment, antibiotics, and disease status. The type of antibiotic administered during rehabilitation altered the microbial community composition, but overall taxonomic diversity remained consistent.
Article
Microbiology
Andrea Unzueta-Martinez, Heather Welch, Jennifer L. Bowen
Summary: The study identified a strong population-specific signal in the microbial community composition of oysters sampled in the wild, and found that even oysters reared in a common garden environment maintained distinct gill-associated microbial communities reflecting their wild population of origin. The majority of gill-associated microbes were resident members specific to each oyster population, but a small portion of the microbial communities was transient and moved among oyster populations, suggesting stochastic assembly also contributes to the oyster gill microbiome.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Agriculture, Dairy & Animal Science
Kerry L. McNally, Jennifer L. Bowen, Jennifer O. Brisson, Adam Kennedy, Charles J. Innis
Summary: This study characterized the tracheal lavage microbiome of sea turtles and found that radiographic lung abnormalities do not correlate with the tracheal lavage microbiome. Culture-dependent methods under-represented the microbial community, many sea turtle pathogens were present in low abundance, and tracheal lavages were not representative of other sections of the respiratory tract. The complex pulmonary microbial community associated with pneumonia in sea turtles did not correlate well with the microbial community identified by tracheal lavage, highlighting the limitations of using tracheal lavage for identifying causative agents of pneumonia.
Letter
Limnology
Andrea Unzueta-Martinez, Alan M. Downey-Wall, Louise P. Cameron, Justin B. Ries, Katie E. Lotterhos, Jennifer L. Bowen
Summary: The study found that certain members of the oyster microbiome were more responsive to environmental conditions, while others were more closely linked to host condition. Different members of the oyster microbiome may contribute to the health and resistance of their hosts, with some members being more vulnerable to changing environmental conditions.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2021)
Article
Biotechnology & Applied Microbiology
Sherlynette Perez Castro, Elena L. Peredo, Olivia U. Mason, Joseph Vineis, Jennifer L. Bowen, Behzad Mortazavi, Anakha Ganesh, S. Emil Ruff, Blair G. Paul, Anne E. Giblin, Zoe G. Cardon
Summary: The study reveals the high diversity of sulfur-cycling microbial communities in salt marsh rhizosphere sediments, with their distribution and genomic features influenced by geographical location and plant species.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Microbiology
Andrea Unzueta-Martinez, Elliot Scanes, Laura M. Parker, Pauline M. Ross, Wayne O'Connor, Jennifer L. Bowen
Summary: This study tracks the microbiomes of Sydney Rock Oyster throughout different developmental stages and finds that each larval stage has a distinct microbiome partially influenced by their parental microbiome. The study also identifies core microbes that persist across life stages and environmentally acquired microbial communities. These findings provide insights into the transmission and evolution of microbial communities in broadcast spawning marine invertebrates.