Article
Ecology
Takuya Sato, Rui Ueda, Gaku Takimoto
Summary: This study highlights the importance of resource subsidy duration in affecting stream ecosystems, with prolonged subsidies leading to increased predation pressure by large fish and pulsed subsidies allowing small fish to capitalize on the resource. Indirect effects on benthic prey and leaf break-down rate varied depending on the duration of the subsidy and the edibility of prey species, suggesting that predator-specific vulnerability can mediate trophic cascades in detritus-based stream food webs. Insights into the effects of subsidy duration can help better understand ecological processes in spatially and temporally coupled ecosystems.**
JOURNAL OF ANIMAL ECOLOGY
(2021)
Review
Environmental Sciences
Bin Hu, Peifang Wang, Chao Wang, Tianli Bao
Summary: This study provides a systematic overview of the photogeochemistry of particulate organic matter (POM) in aquatic environments, focusing on photodissolution and photo induced flocculation processes. Photodissolution can alter the bioavailability of organic matter and impact the biogeochemical cycling of nutrients, heavy metals, and organic pollutants; while photo induced flocculation may influence the transport and transformation of organic matter and associated pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Energy & Fuels
Adam Zakrzewski, Marta Waliczek, Pawel Kosakowski, Krzysztof Jurek, Irena Matyasik
Summary: A set of 24 core samples from the Lower Keuperian and Grabfeld Formation in the Polish Basin were analyzed using geochemical and petrological methods. The results showed that the organic matter in the samples is mostly mature/overmature. The presence of allochthonous organic matter influenced some geochemical indicators and indicated the presence of a fluvial-deltaic paleoenvironment. The degree of organic matter diagenetic oxidation was determined using various ratios based on phenanthrene, methylphenanthrenes, and aromatic ketones.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Engineering, Marine
Noor Fazreen Dzulkafli, Akbariah Mahdzir, Hirofumi Hara
Summary: The research utilized various analytical methods to compare the organic matter in different coastal sediments in Peninsular Malaysia, finding differences in elemental analysis among the three samples, which aligned with results from UV-Vis and fluorescence spectroscopy analyses. WEOM was largely dominated by HFOC, and variations in DOM within different coastal ecosystems could be attributed to various human and land activities.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Logan Swaren, Daniel S. Alessi, George W. Owttrim, Kurt O. Konhauser
Summary: Marine cyanobacteria play a crucial role in trace metal cycling in the oceans. Upon cell lysis, bacterial detritus contributes significantly to trace metal sequestration in deep marine sediments. Experimental results show that bacterial detritus has lower affinity towards trace metals compared to intact cyanobacteria cells, suggesting that intact cells are primarily responsible for trace metal sequestration.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Environmental Sciences
Yan-Ting Zuo, Shi Cheng, Hao-Han Jiang, Yu-Ze Han, Wen-Xiang Ji, Zheng Wang, Qing Zhou, Ai-Min Li, Wen-Tao Li
Summary: This study investigated the release and treatability of algae-derived organic matter (AOM) during water treatments. It was found that humic substances can protect algal cell membrane during prechlorination, and the variation of humic-like fluorescence can indicate the chlorine dose. Prechlorination released low molecular weight fractions and fluorescent nitrogenous biopterins. Physically extracted AOM cannot represent the released organic matter during prechlorination. Coagulation was more affected by humic substances than AOM released during prechlorination, and high molecular weight biopolymers and humic substances can be removed effectively. Low molecular weight fractions released by prechlorination can also be effectively removed, while other fractions were recalcitrant to coagulation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Yanqing Duan, Aijuan Zhou, Xiuping Yue, Zhichun Zhang, Yanjuan Gao, Yanhong Luo, Xiao Zhang
Summary: The study investigated the accelerated hydrolysis of particulate organic matter (POM) by using mesh sieves, which showed significantly improved hydrolysis efficiency and a higher hydrolysis constant. The domestication of specific microbial communities played a key role in the process. Improving POM hydrolysis method can economically enhance carbon availability for biological nutrient removal processes.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
Article
Environmental Sciences
Biao Li, Muhua Feng, Xiangchao Chen, Yarui Wang, Yue Shen, Qinglong L. Wu
Summary: Abundant organic matters potentially exacerbate chemical iron reduction, leading to the occurrence of black bloom in deep lakes like Lake Fuxian.
ENVIRONMENTAL POLLUTION
(2021)
Article
Microbiology
Bethany G. Fox, Robin M. S. Thorn, Darren M. Reynolds
Summary: This study investigates the origin and range of fluorescent organic matter (FOM) produced by environmentally sourced freshwater bacteria, challenging the binary classification of FOM as either autochthonous or allochthonous. The study demonstrates that FOM processing and production occur along a dynamic continuum, with both in-situ production by microbial processes and transportation into aquatic systems from external sources. Additionally, fluorescence intensity data for environmental bacteria isolate monocultures are presented for the first time, allowing for the assessment of the relative contribution of different bacteria to the autochthonous FOM pool.
Article
Soil Science
Paula Berenstecher, Georgina Conti, Ana Faigon, Gervasio Pineiro
Summary: Recent studies have emphasized the importance of rhizodeposition in soil organic matter (SOM) formation, but quantification in different soil fractions is still uncommon. Through a pot experiment using a dual isotope brush-labeling method, our study evaluated the effectiveness of tracing plant-derived carbon (C) and nitrogen (N) into the soil and demonstrated the significant contribution of rhizodeposition to the formation of mineral-associated organic matter (MAOM).
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Review
Oceanography
Youhei Yamashita, Tetsu Tosaka, Rise Bamba, Ryuichi Kamezaki, Shuji Goto, Jun Nishioka, Ichiro Yasuda, Toru Hirawake, Joji Oida, Hajime Obata, Hiroshi Ogawa
Summary: The study highlights the Sea of Okhotsk as the major source region of allochthonous FDOM in the North Pacific Intermediate Water (NPIW), rather than the Bering Sea. Allochthonous FDOM derived from shelf sediments in the Sea of Okhotsk is conservatively distributed throughout the North Pacific via the circulation of intermediate water, especially the upper part of NPIW. Furthermore, the study demonstrates that FDOM can aid in determining the spatiotemporal distribution of NPIW and its mixing with other water masses in the deep ocean.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Engineering, Environmental
Weihua Li, Muhammad Saboor Siddique, Mengjie Liu, Nigel Graham, Wenzheng Yu
Summary: Riparian zones are important for water purification as they can decrease the concentration of organic matter in water through adsorption and microbial degradation. This study investigated the migration of dissolved organic matter (DOM) in riparian zones and found that wetland soils can absorb organic matter from forest soils and adjacent reservoirs, acting as a major sink for organic matter. Microorganisms in the wetland system were found to utilize certain compounds as electron acceptors, leading to enhanced removal of organic matter.
Article
Soil Science
Karin Nikolaus, Judith Schellekens, Steven Mols, Boris Jansen, Maria J. I. Briones, Ellen Desie, Jean-Thomas Cornelis, Samira Absalah, Bart Muys, Karen Vancampenhout
Summary: By comparing the molecular composition and environmental significance of different soil organic matter (SOM) fractions, we found that only HA and BE fractions were successful in capturing the overall processes of soil carbon (C) dynamics. Different SOM fractions can be used complementary to each other to study the environmental and ecological effects of forest stand conversion on soil C dynamics.
Article
Environmental Sciences
Ruben Campanero, Nadia Burgoa, Bieito Fernandez-Castro, Sara Valiente, Mar Nieto-Cid, Alba M. Martinez-Perez, Maria Dolores Gelado-Caballero, Nauzet Hernandez-Hernandez, Angeles Marrero-Diaz, Francisco Machin, Angel Rodriguez-Santana, Ines Hernandez-Garcia, Antonio Delgado-Huertas, Antonio Martinez-Marrero, Javier Aristegui, Xose Anton Alvarez-Salgado
Summary: In this study, the distributions of dissolved and suspended organic matter in the Cape Verde Frontal Zone (CVFZ) were investigated at high resolution. The results indicate that the input of Sahara dust and release of DOM from sinking particles are key factors contributing to the complexity of DOM and POM dynamics in the CVFZ.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Qianjin Che, Zhongsheng Zhang, Wang Jim Jian
Summary: Cultivation of marshes to arable land or sugarcane causes depletion of soil organic carbon within a short time. This study investigated the molecular composition of soil organic matter and found that land use change significantly altered it. The decrease in lignin and phenolic compounds during land use change was consistent with the decrease in soil organic carbon, indicating their instability. Land use change also resulted in more diverse molecular components in arable land or sugarcane compared to marshes. The findings suggest that land use change not only affects carbon fluxes but also changes the molecular mechanisms driving the carbon cycle.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Biology
Allison L. Bidlack, Sarah M. Bisbing, Brian J. Buma, Heida L. Diefenderfer, Jason B. Fellman, William C. Floyd, Ian Giesbrecht, Amritpal Lally, Ken P. Lertzman, Steven S. Perakis, David E. Butman, David D'Amore, Sean W. Fleming, Eran W. Hood, Brian P. Hunt, Peter M. Kiffney, Gavin McNicol, Brian Menounos, Suzanne E. Tank
Summary: Coastal margins are vital areas for material exchange between terrestrial and marine ecosystems. Climate-induced changes in coastal terrestrial ecosystems and hydrologic regimes can impact nearshore ocean chemistry and food web dynamics. Research in these ecosystems can enhance understanding of terrestrial-marine links and climate sensitivities.
Article
Geosciences, Multidisciplinary
Heida L. Diefenderfer, Amy B. Borde, Valerie Cullinan
Summary: The sedimentation rate in tidal marshes increases with water depth, and elevation is negatively correlated with accretion rate while positively correlated with total organic carbon content. Spatial patterns of cross-sectional morphology in wetlands conform to typical forms in estuarine areas, but differ in riverine reaches. Channel perimeter and surface area exhibit high variability between estuarine and riverine reaches.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Biodiversity Conservation
G. Curtis Roegner, Gary E. Johnson, Andre M. Coleman
Summary: The study revealed varying levels of accessibility to different salmon species in intertidal wetlands, with Chum Salmon having more stable opportunities compared to Chinook Salmon and Coho Salmon. Inundation in wetlands fluctuated nonlinearly with tidal height, and fish were able to access the productive marsh edge for approximately 40-50% of the time during out-migration periods. The fish habitat opportunity index provided a realistic metric for assessing fish habitat opportunity and could aid resource managers in predicting the relative effects of restoration efforts on habitat opportunity for juvenile anadromous fishes.
ECOLOGICAL INDICATORS
(2021)
Article
Ecology
G. Curtis Roegner, Stephanie A. Fields, Sarah K. Henkel
Summary: The study found that the thin-layer sediment deployment method has the potential to minimize direct impacts on epifauna during beach nourishment. Crabs were significantly impacted, while gastropods were more resistant and the impact was relatively brief. The results indicate an acute and ephemeral impact on crabs.
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
(2021)
Article
Ecology
Ian A. Sinks, Amy B. Borde, Heida L. Diefenderfer, Jason P. Karnezis
Summary: The control methods for reed canarygrass in tidal wetlands are not suitable for its unique conditions, and alternative strategies such as implementing control pre-restoration, topographic modification, and limiting nutrient availability are recommended for successful long-term control.
NATURAL AREAS JOURNAL
(2021)
Article
Ecology
Chanda Littles, Jason Karnezis, Katie Blauvelt, Anne Creason, Heida Diefenderfer, Gary Johnson, Lynne Krasnow, Phil Trask
Summary: This article discusses the key developments in science, coordination, and management that have led to the success of the Columbia Estuary Ecosystem Restoration Program (CEERP). Through adaptive management, the program addresses uncertainties and has achieved significant restoration of floodplain habitat. The article also outlines future plans and goals for the program.
RESTORATION ECOLOGY
(2022)
Editorial Material
Multidisciplinary Sciences
Heida L. Diefenderfer, Larry D. McKinney, Walter R. Boynton, Kenneth L. Heck, Barbara A. Kleiss, Deepak R. Mishra, Holly Greening, Albert A. George, Bethany A. Carl Kraft, Catherine L. Kling
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Microbiology
Taniya RoyChowdhury, Lisa M. Bramer, Joseph Brown, Young-Mo Kim, Erika Zink, Thomas O. Metz, Lee Ann McCue, Heida L. Diefenderfer, Vanessa Bailey
Summary: This study presents observations from a laboratory-controlled study on the impacts of extreme wetting and drying on a wetland soil microbiome. The results demonstrate the predictive power of soil metabolites for bacterial community structure formation.
Article
Environmental Sciences
Holly S. Greening, Kenneth L. Heck, Larry D. McKinney, Heida L. Diefenderfer, Walter R. Boynton, Barbara A. Kleiss, Deepak R. Mishra, Albert A. George, Bethany A. Carl Kraft, Cathy A. Kling, Laura A. Windecker
Summary: A recent report from the National Academies addresses the cumulative effects of large-scale restoration projects and the challenges in monitoring and assessing these effects in the context of long-term environmental change. The report highlights gaps in data collection, data accessibility issues, and the lack of synthesis and analysis as obstacles to understanding the impacts of restoration efforts on ecosystem health and productivity in the Gulf of Mexico. The proposed approach includes using emerging monitoring technologies, devising an adaptive management framework, reassessing restoration goals, and conducting rigorous synthesis and analysis to overcome these challenges and achieve large-scale environmental recovery.
ESTUARIES AND COASTS
(2023)
Article
Environmental Sciences
William J. Templeton, David A. Jay, Heida L. Diefenderfer, Stefan A. Talke
Summary: Decreases in shallow-water habitat area have negatively impacted salmonid populations in the Lower Columbia River and Estuary. Levees were found to be the largest cause of SWHA loss.
ESTUARIES AND COASTS
(2023)
Article
Geosciences, Multidisciplinary
M. W. Brand, H. L. Diefenderfer, J. E. O'Connor, A. B. Borde, D. A. Jay, A. Al-Bahadily, M. McKeon, S. A. Talke
Summary: Subsidence caused by subduction zone earthquakes can significantly impact estuarine bathymetry. Through using a hydrodynamic and habitat model, we quantified the effects of earthquake-induced subsidence on hydrodynamics and habitat distributions in the lower Columbia River Estuary, a major system. The model results show that coseismic subsidence increases tidal range, with the largest increase occurring in areas of topographic convergence. Intertidal habitat is reduced by 24%-25% in all scenarios, and about 93% of estuarine wetlands are shifted to lower-elevation habitat bands. Considering the dynamic effects of tidal changes from subsidence leads to higher estimates of remaining habitat, depending on the habitat type.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Malia H. H. Scott, Stefan A. A. Talke, David A. A. Jay, Heida L. L. Diefenderfer
Summary: This study examines the changes in water temperatures in the lower Columbia River by analyzing historical temperature measurements since the 1850s. The results show an increase in annual averaged water temperature by 2.2℃ since the 1850s, with a rate of 1.3℃/century. The increase in water temperature is primarily driven by warming air temperatures (29%), altered river flow (14%), and water resources management (57%).
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Stefan A. Talke, David A. Jay, Heida L. Diefenderfer
Summary: Using archival research methods, this study developed a statistical regression model to analyze the changes in water temperature in the lower Willamette River over a 140-year period. The results showed a consistent increase in temperature, with the largest shift occurring in winter months. The duration of high temperatures and the decrease in cold-water days have also been observed. These changes are primarily attributed to increases in air temperature and alterations in the river system.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Review
Ecology
Heida L. Diefenderfer, Gregory D. Steyer, Matthew C. Harwell, Andrew J. LoSchiavo, Hilary A. Neckles, David M. Burdick, Gary E. Johnson, Kate E. Buenau, Elene Trujillo, John C. Callaway, Ronald M. Thom, Neil K. Ganju, Robert R. Twilley
Summary: In large-scale ecosystem restoration efforts, the cumulative effects of interacting restoration projects have positive impacts on species and ecosystems at landscape and regional scales, and can help reduce countervailing effects.
FRONTIERS IN ECOLOGY AND THE ENVIRONMENT
(2021)
Article
Environmental Sciences
Samuel F. Harding, Andre M. Coleman, G. Curtis Roegner
RIVER RESEARCH AND APPLICATIONS
(2020)