Article
Engineering, Environmental
Junkai Gao, Guanglong Liu, Xiaowen Li, Mengjuan Tang, Xiuyun Cao, Yiyong Zhou, Chunlei Song
Summary: This study investigated the impact of organic carbon quantity and composition on nitrate reduction pathways in two basins of Lake Chaohu in Hefei City, China. It was found that the serious algal bloom in the west basin resulted in higher organic carbon accumulation and nitrate deficiency, leading to a high C/NO3--N ratio. This triggered dissimilatory nitrate reduction to ammonium (DNRA) and specific bacterial communities played a role in this process.
Article
Marine & Freshwater Biology
Irini Tsikopoulou, Maria Lampa, Anastasia Tsiola, Paraskevi Pitta, Manolis Tsapakis, Ioannis Karakassis
Summary: The study found that organic matter inputs from fish farming affect the interaction between microphytobenthos and macrofauna, with bioturbation potential being the main driver of shaping the microphytobenthic community composition in the ecosystem.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Environmental Sciences
Xiaowen Li, Qinghui Deng, Zhimin Zhang, Dong Bai, Zhenghan Liu, Xiuyun Cao, Yiyong Zhou, Chunlei Song
Summary: This study investigated the effects of sulfur cycle and enzyme activity on dissimilatory nitrate reduction processes (DNRPs) in natural and human-modified heterotrophic sediments. The key driver of DNRPs was found to be glucosidase activity (GLU), and the sulfur cycle played a general restrictive role in the regulation and partitioning of DNRPs.
Article
Environmental Sciences
Xiaosi Su, Zhuyan Zheng, Yaoxuan Chen, Yuyu Wan, Hang Lyu, Weihong Dong
Summary: Riverbank filtration (RBF) is a widely used technique globally for groundwater quality maintenance and clean drinking water production. The ratio of organic carbon to nitrate in groundwater does not directly affect the rate of nitrate reduction, but can control the competitive partitioning between different processes. Seasonal variations in the OC: NO3- ratio in groundwater can significantly influence the enrichment process during RBF.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Haoming Xu, Guodong Song, Siqi Yang, Ruosi Zhu, Guiling Zhang, Sumei Liu
Summary: This study investigates benthic nitrogen cycling in the deep ocean of the Kuroshio Extension region and highlights nitrification as the predominant process and anammox as the dominant N-loss process. The findings suggest temperature and ammonium are limiting factors for deep-ocean benthic N-loss. Additionally, there is a tight coupling relationship between pelagic primary production and the benthic nitrogen cycle in the study area.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Helena Jantti, Sanni L. Aalto, Hans W. Paer
Summary: This study conducted in the Neuse River Estuary in North Carolina, USA, found that DNRA dominated over denitrification in this hypoxic estuary, with no clear correlation between potential nitrate reduction rates, salinity, or dissolved oxygen levels. Prolonged hypoxia led to a loss of denitrification capacity and increased nitrous oxide formation in sediments. Additions of hydrogen sulfide stimulated DNRA while additions of ferrous iron stimulated nitrate consumption, but the exact end product was unclear.
ESTUARIES AND COASTS
(2021)
Article
Fisheries
Nuria Casado-Coy, Pablo Sanchez-Jerez, Jesus S. Troncoso, Carlos Sanz-Lazaro
Summary: Mollusc shell debris released from marine aquaculture affects sediment structure and biogeochemical processes, with its promotion of macrofaunal communities with high bioturbation potential depending on environmental conditions. Shell-hash can be used as a management practice to improve ecosystem function in sediments under certain circumstances.
Article
Marine & Freshwater Biology
Sanni L. Aalto, Eero Asmala, Tom Jilbert, Susanna Hietanen
Summary: Coastal environments play a crucial role in regulating the transfer of nitrogen from land to sea, with variations in nitrate reduction processes between estuary and offshore archipelago environments in the Baltic Sea. The balance between denitrification and DNRA processes is influenced by the ratio of nitrate to autochthonous organic carbon, impacting the release of nitrous oxide and efficiency of nitrogen recycling in different coastal areas.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Engineering, Marine
Stephanie Mangan, Andrew M. Lohrer, Simon F. Thrush, Joanne I. Ellis, Conrad A. Pilditch
Summary: Anthropogenic increases in nutrient delivery have fundamentally altered the biogeochemical cycling in the marine coastal zone, with potential ecological shifts. Long-term enrichment and ecological complexity have limited our ability to effectively manage and prevent these changes.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Lijie Zhou, Bikai Zhao, Wei-Qin Zhuang
Summary: The double-edged sword effects of Dissimilatory nitrate reduction to ammonium (DNRA) bacteria on anammox bacteria were investigated. It was found that the overgrowth of DNRA bacteria had a negative impact on the nitrogen removal efficiency of anammox bacteria.
Article
Environmental Sciences
Xiaofei Li, Wei Qian, Mengting Qi, Dengzhou Gao, Cheng Liu, Min Liu, Lijun Hou
Summary: The study revealed that high-frequency hypoxia can decrease denitrification and anammox rates while increasing DNRA rates, with important implications on nitrogen retention and removal.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Environmental Sciences
Dongyao Sun, Jiafang Huang, Min Luo, Cheng Chen, Xue Lan, Weifang Hu
Summary: Intensive aquaculture in estuaries and coasts has led to ecological and environmental problems. Among nitrogen transformation pathways, dissimilatory nitrate reduction plays a crucial role in regulating reactive nitrogen. This study investigated the three sediment processes of nitrate reduction and found that denitrification was the dominant pathway. Environmental factors such as C and N substrates and salinity significantly influenced nitrate reduction. The nitrogen losses from denitrification and anaerobic ammonium oxidation were substantial, indicating the importance of coastal reclamation in nitrogen removal.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Environmental
Xingyu Jiang, Changqing Liu, Jian Cai, Yang Hu, Keqiang Shao, Xiangming Tang, Yi Gong, Xiaolong Yao, Qiujin Xu, Guang Gao
Summary: This study investigates the modulation of denitrification and DNRA rates by gene abundances and environmental factors in eutrophic lakes. The results indicate that denitrification rates increase with eutrophication, while DNRA rates do not. The nitrification process provides ample nitrate for denitrification, and certain microbial genera are responsible for these processes. Further eutrophication indirectly affects denitrification and DNRA rates through modulation of N-cycling microbe gene abundances.
Article
Soil Science
Chenglin Li, Zhijun Wei, Xiaomin Wang, Xiaofang Ma, Pinpin Yang, Jun Shan, Xiaoyuan Yan
Summary: This study found that long-term application of NPK and NPKS fertilizers can enhance the rates of dissimilatory nitrate reduction processes in rice paddy fields, mainly by altering soil carbon components. NPKS is more effective in maintaining soil fertility in the paddy field.
SOIL USE AND MANAGEMENT
(2023)
Article
Agricultural Engineering
Hao Sheng, Rui Weng, Yan He, Zheng Wei, Yanmei Yang, Jinghan Chen, Minsheng Huang, Gongming Zhou
Summary: This study identified a nitrate-calcium-based pathway that accelerated the start-up of anammox. Calcium nitrate induced partial denitrification to provide nitrite for anammox, while also increasing the contribution of dissimilatory nitrate reduction to ammonium (DNRA). This mutualistic symbiosis among denitrification, DNRA, and anammox in the calcium nitrate-added systems explained the accelerated start-up of anammox.
BIORESOURCE TECHNOLOGY
(2021)
Review
Environmental Sciences
Sarah McDonald, Tom Cresswell, Kathryn Hassell, Michael Keough
Summary: Live animal gamma radioisotope tracing is a valuable tool for monitoring the real-time contaminant uptake and retention in individual animals for ecotoxicologists. A systematic review of current aquatic studies found shortcomings in experimental design and statistical approaches, leading to key recommendations for future researchers. Despite some studies not matching the statistical approach with the experimental design, most studies utilized the correct approach for analyzing data.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2022)
Article
Fisheries
A. K. Farmery, K. Alexander, K. Anderson, J. L. Blanchard, C. G. Carter, K. Evans, M. Fischer, A. Fleming, S. Frusher, E. A. Fulton, B. Haas, C. K. MacLeod, L. Murray, K. L. Nash, G. T. Pecl, Y. Rousseau, R. Trebilco, I. E. van Putten, S. Mauli, L. Dutra, D. Greeno, J. Kaltavara, R. Watson, B. Nowak
Summary: Seafood plays a significant role in promoting healthy and sustainable diets, as well as addressing hunger and malnutrition. The supply and consumption of seafood are affected by various factors and need to be examined holistically to align with the 2030 Sustainable Development Goals.
REVIEWS IN FISH BIOLOGY AND FISHERIES
(2022)
Article
Fisheries
Kathryn A. Willis, Catarina Serra-Goncalves, Kelsey Richardson, Qamar A. Schuyler, Halfdan Pedersen, Kelli Anderson, Jonathan S. Stark, Joanna Vince, Britta D. Hardesty, Chris Wilcox, Barbara F. Nowak, Jennifer L. Lavers, Jayson M. Semmens, Dean Greeno, Catriona MacLeod, Nunnoq P. O. Frederiksen, Peter S. Puskic
Summary: The ocean is often seen as a sink for pollution in the Anthropocene era, with various types of pollution threatening marine ecosystems. Despite awareness and data on risks, there is a significant delay in implementing strategies to address marine pollution. Experts present two future scenarios and prioritize actions for governments, industry, and consumers to reduce pollution and move towards a more sustainable future.
REVIEWS IN FISH BIOLOGY AND FISHERIES
(2022)
Article
Ecology
Michelle N. Simone, Joanne M. Oakes, Kai G. Schulz, Bradley D. Eyre
Summary: The impact of future climate change on benthic nitrogen recycling and assimilation was assessed in this study. The results showed that combinations of warming and ocean acidification significantly affected the fluxes of dissolved inorganic nitrogen (DIN), highlighting the importance of considering combined stressor treatments when studying ecosystem responses to future climates.
MARINE ECOLOGY PROGRESS SERIES
(2022)
Article
Engineering, Environmental
Sarah McDonald, Aleicia Holland, Stuart L. Simpson, Jennifer B. Gadd, William W. Bennett, Glen W. Walker, Michael J. Keough, Tom Cresswel, Kathryn L. Hassell
Summary: Stormwater runoff contains metal contaminants that pose a potential risk to water quality. During a storm, the concentrations of dissolved and particulate metals increase. Most of the metals exist in a complexed form during the storm, posing a lower risk of toxicity to aquatic organisms. Current water quality guideline values may be too conservative when assessing stormwater pollution risks from metal contaminants.
Article
Environmental Sciences
Peisheng Huang, Eduardo R. De Sousa, Naomi S. Wells, Bradley D. Eyre, Badin Gibbes, Matthew R. Hipsey
Summary: Estuaries play a significant role in the global greenhouse gas budget, but there are uncertainties in modeling predictions of CO2 and CH4 emissions. This study presents a modeling framework to assess the sensitivity and uncertainty of CO2 and CH4 concentrations and emissions, applied to the Brisbane River in Australia. The findings demonstrate that riverine inputs are the main factor influencing estuarine CO2 concentrations, while sediment production and pelagic oxidation are the main factors influencing estuarine CH4 concentrations.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Environmental Sciences
Anita K. Perkins, Isaac R. Santos, Andrew L. Rose, Kai G. Schulz, Hans-Peter Grossart, Bradley D. Eyre, Brendan P. Kelaher, Joanne M. Oakes
Summary: Marine macroalgae, as a primary producer in coastal ecosystems, play a crucial role in blue carbon sequestration. This study focused on the fate of carbon from macroalgal detritus deposition on beaches. The results showed that a significant amount of carbon was released as dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC), while a small portion was emitted as CO2. Carbonate alkalinity formed during degradation could contribute to coastal carbon cycling and marine carbon sequestration.
Article
Environmental Sciences
Jian-Jhih Chen, Naomi S. Wells, Dirk Erler, Bradley D. Eyre
Summary: Land-use changes in catchments have an impact on benthic N2O cycling in estuaries, with benthic habitats acting as either a sink or source of N2O. Benthic N2O fluxes are significantly correlated with benthic NO3- fluxes, indicating the importance of NO3- availability in controlling benthic N2O fluxes.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Environmental Sciences
Elisabeth S. M. Deschaseaux, Hilton B. Swan, Damien T. Maher, Graham B. Jones, Kai G. Schulz, Edwin P. Koveke, Kei Toda, Bradley D. Eyre
Summary: The Earth's Radiation Budget is influenced by the balance between biogenic volatile organic compounds (BVOCs) and greenhouse gases (GHGs). The study found that coral reefs release both dimethyl sulfide (DMS) and methane (CH4), and these two compounds are closely linked in emissions. These findings are important for understanding the complexity of compound emissions in coral reef systems and their role in climate regulation.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Naomi S. Wells, Daren C. Gooddy, Mustefa Yasin Reshid, Peter J. Williams, Andrew C. Smith, Bradley D. Eyre
Summary: Accurately tracing the sources and fate of excess PO43- in waterways is crucial for sustainable catchment management. The natural abundance isotopic composition of O in PO43- (δO-18(P)) shows promise as a tracer for point source pollution, but its ability to track diffuse agricultural pollution is still uncertain.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Sri Adiyanti, Yasuyuki Maruya, Bradley D. Eyre, Perrine Mangion, Jeffrey Turner, Mathew R. Hipsey
Summary: This study demonstrates the successful allocation of nitrogen sources during wet periods by measuring the dual stable isotopes of nitrate in conjunction with routine nitrogen concentration data. The main land use exporting nitrogen during high rainfall periods was wetland, with reduced uncertainty in calculated rates when using dual isotopes.
WATER RESOURCES RESEARCH
(2022)
Article
Ecology
S. Cronin-O'Reilly, N. S. Wells, R. McCallum, C. S. Hallett, J. R. Tweedley, F. J. Valesini, B. D. Eyre
Summary: Anthropogenic alterations to coastal sediments and their benthic macroinvertebrate communities impair ecosystem function. Sediment condition has a greater influence on benthic metabolism, while the macroinvertebrate community has a greater impact on nutrient exchange. Denitrification is driven by both sediment condition and the community. Overall, benthic macroinvertebrates have limited effects on ecosystem processes, indicating their limited functional role in this estuary. There is also a functional decoupling between sediment condition and the community. Community biomass is the most frequently selected predictor for significant macroinvertebrate effects.
MARINE ECOLOGY PROGRESS SERIES
(2022)
Article
Ecology
S. Cronin-O'Reilly, N. S. Wells, R. McCallum, C. S. Hallett, J. R. Tweedley, F. J. Valesini, B. D. Eyre
Summary: The ability of deoxygenation treatment to remove macroinvertebrates from sediment cores is limited, and the remaining biomass has significant effects on environmental fluxes. Different communities have divergent responses to hypoxia.
MARINE ECOLOGY PROGRESS SERIES
(2022)
Article
Environmental Sciences
Judith A. Rosentreter, Goulven G. Laruelle, Hermann W. Bange, Thomas S. Bianchi, Julius J. M. Busecke, Wei-Jun Cai, Bradley D. Eyre, Inke Forbrich, Eun Young Kwon, Taylor Maavara, Nils Moosdorf, Raymond G. Najjar, V. V. S. S. Sarma, Bryce Van Dam, Pierre Regnier
Summary: This article analyzes data from 738 observation sites and finds that coastal ecosystems have a certain absorption effect on greenhouse gases in the atmosphere, but methane and nitrous oxide emissions counteract the absorption of carbon dioxide. Southeast Asia, North America, and Africa are identified as hotspots for coastal greenhouse gas absorption.
NATURE CLIMATE CHANGE
(2023)
Article
Environmental Sciences
Bradley D. Eyre, Nicola Camillini, Ronnie N. Glud, Judith A. Rosentreter
Summary: Blue carbon refers to carbon stored in vegetated coastal ecosystems for a long time, which is an important sink for atmospheric CO2. However, the production and release of methane and nitrous oxide during organic matter decomposition can affect the climate benefit of blue carbon. A meta-analysis of seagrass methane and nitrous oxide fluxes and organic carbon burial rates was conducted, and the reduced climate benefit of seagrass blue carbon was estimated using three upscaling approaches. The study found that methane and nitrous oxide release from seagrass ecosystems offset around 7% to 33% of the global climate benefits of CO2 drawdown by seagrasses. This highlights the importance of considering methane and nitrous oxide fluxes and using long-term organic carbon burial rates in future assessments of seagrass blue carbon.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)