Article
Environmental Sciences
Damiano Baldan, Matthias Pucher, Elmira Akbari, Thomas Hein, Gabriele Weigelhofer
Summary: The study focused on analyzing the efficiency of a two-stage ditch in improving the stream sediment structure and functionality under different hydrological conditions. Results showed that the two-stage ditch reach had no changes in sediment texture and stocks, while the floodplain reach had higher fines and organic matter content under all hydrological conditions.
Article
Limnology
Enrico Bertuzzo, Erin R. Hotchkiss, Alba Argerich, John S. Kominoski, Diana Oviedo-Vargas, Philip Savoy, Rachel Scarlett, Daniel von Schiller, James B. Heffernan
Summary: This study used an inverse modeling framework to estimate the contribution of different organic matter sources to stream ecosystem respiration and found that respiration of autochthonous organic matter was correlated with seasonal peaks in gross primary production, while respiration associated with litter inputs was larger in smaller streams.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Biochemistry & Molecular Biology
Andreas Nord, Imen Chamkha, Eskil Elmer
Summary: Understanding mitochondrial biology and pathology is crucial for understanding animal evolution. However, current mitochondrial measurement methods are often invasive or terminal, which is challenging for wild models and longitudinal studies. To overcome this limitation, researchers have utilized mitochondria in non-mammal vertebrates' red blood cells for minimally invasive measurement. This study developed a protocol to measure mitochondrial respiration in bird whole blood and found that whole blood measurement provided faster, more reproducible, and more biologically relevant assessment of mitochondrial respiration compared to isolated blood cell measurement. The authors recommend using whole blood approach for future studies unless specific circumstances require isolated blood cell use.
Article
Food Science & Technology
Annamaria Ricciardi, Livia Vanessa Storti, Marilisa Giavalisco, Eugenio Parente, Teresa Zotta
Summary: This study evaluated the effects of anaerobic and respiratory cultivations, citrate supplementation, and different pH values on Leuconostoc mesenteroides subsp. cremoris E30. The results showed that respiratory cultivation benefited growth rate, biomass, and antioxidant enzyme activity. Citrate supplementation impaired the growth rate of respiratory cells.
Article
Environmental Sciences
Rina Heu, May Phue Wai, Sokly Siev, Vibol Chem, Khy Eam Eang, Vannak Ann, Mohamed Ateia, Chihiro Yoshimura
Summary: This study investigated the role of DSi in Tonle Sap Lake, Cambodia. The concentration of DSi was higher in the dry season than in the wet season, and both measurements were comparable with lakes in other parts of the world. The molar ratio of TN:TP:DSi suggested limitation of TP and DSi in both seasons, and phytoplankton biomass was found to be influenced by DSi, TN:TP, dissolved oxygen, and water temperature.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Flavia Tromboni, Erin R. Hotchkiss, Anne E. Schechner, Walter K. Dodds, Simon R. Poulson, Sudeep Chandra
Summary: Diel variations in the isotopic composition of dissolved oxygen in river water suggest that carbon cycling in rivers may be faster than previously thought. By comparing oxygen concentration data with stable oxygen isotope signatures, researchers found that ecosystem respiration and gross primary production in rivers were higher than predicted by traditional methods.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Environmental Sciences
Manolaki Paraskevi, Gimenez-Grau Pau, Pastor Ada, Baattrup-Pedersen Annette, Riis Tenna
Summary: Weed cutting in a large lowland river in Denmark significantly altered the physical conditions of the river and reduced the metabolic rates of Gross Primary Production (GPP) and Ecosystem Respiration (ER). Moreover, the metabolic rates did not fully recover to pre-weed cutting levels within 2-6 weeks. The study highlights the need to consider the cascade effects of metabolic rate alterations on ecosystem structure and functioning in future management plans.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Michele A. Burford, Stephen J. Faggotter
Summary: Estuaries in the tropical Gulf of Carpentaria in Australia are facing increasing pressure from catchment water development. The addition of nutrients can stimulate mudflat primary production, with the Flinders estuary being the most productive of the three. However, excessive water development may impact productivity in these estuaries.
MARINE POLLUTION BULLETIN
(2021)
Article
Ecology
Irene E. Teubner, Matthias Forkel, Benjamin Wild, Leander Moesinger, Wouter Dorigo
Summary: The study focuses on utilizing VOD to estimate global vegetation productivity, and finds that including temperature factor improves the model performance across different regions, with less improvement observed in tropical regions. The VOD-GPP model is able to capture the response of GPP to water availability, and in some regions, the model performance shows negative or positive correlations with SPEI.
Article
Limnology
James M. Hood, Lyndsie M. Collis, John D. Schade, Rebecca A. Stark, Jacques C. Finlay
Summary: This study investigated benthic POM-associated respiration and nutrient uptake in six streams in the forested South Fork Eel River watershed. The results showed that downstream sites had benthic POM composed of smaller particles with lower organic matter content and richer in nitrogen and autotrophic material. Areal respiration and nutrient uptake rates increased with stream size, while microbial biomass determined longitudinal patterns in benthic POM-associated areal nutrient uptake and respiration rates.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Environmental Sciences
Luke C. Loken, Steven Sadro, Leah E. K. Lenoch, Paul R. Stumpner, Randy A. Dahlgren, Jon R. Burau, Erwin E. Van Nieuwenhuyse
Summary: Estuaries are productive aquatic ecosystems, but the understanding of their primary production patterns and drivers is incomplete. A whole-ecosystem experiment in the Sacramento-San Joaquin Delta showed that hydrodynamics and various factors influence primary production. Stratification and light availability have a stronger influence on primary production than nitrogen. Nitrogen and chlorophyll are positively related, suggesting that stratification may trigger nutrient limitation. Nitrogen can become limiting in time and space, especially during episodic stratification events.
ESTUARIES AND COASTS
(2022)
Article
Geosciences, Multidisciplinary
Francesco Mattei, Michele Scardi
Summary: Phytoplankton primary production plays a key role in oceanographic processes, but global datasets are currently scattered and incomplete. Researchers have compiled and analyzed data from various sources to create a unified dataset, in hopes of providing a convenient resource for those studying marine phytoplankton production.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Limnology
Devanshi Pathak, Michael Hutchins, Lee E. Brown, Matthew Loewenthal, Peter Scarlett, Linda Armstrong, David Nicholls, Mike Bowes, Francois Edwards, Gareth Old
Summary: This article presents a new approach for estimating ecosystem metabolism in rivers using a high-resolution, process-based model. The model takes into account variations in flow and water quality, and provides insights into the differences in metabolism at different seasons and locations along the River Thames. The model can be used for rapid river health assessments and has the potential to predict metabolism rates under future scenarios of environmental change.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Ecology
Philippe Cherabier, Regis Ferriere
Summary: The response of ocean primary production to climate warming is affected by microbial loop activity and bacterial adaptation, which can reverse the negative impacts of climate warming through bacterial adaptation.
Article
Microbiology
Mingzhu Huang, Lingfeng Zhu, Lin Feng, Li Zhan, Yue Zhao, Xuelan Chen
Summary: This study successfully engineered C. crenatum to enhance L-arginine production under anaerobic conditions through altering metabolic pathways.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Water Resources
Natalie A. Griffiths, Patrick J. Mulholland
Summary: The original Walker Branch Watershed (WBW) project, established in 1967, aimed to study elemental cycling and mass balances in an unimpacted watershed. Over the next 50+ years, additional studies and long-term observations on WBW advanced understanding of catchment hydrology, biogeochemistry, and ecology, establishing WBW as a seminal site for catchment science. The long-term datasets collected on WBW have been and will continue to be crucial in evaluating the influence of climatic and environmental factors on catchment processes.
HYDROLOGICAL PROCESSES
(2021)
Article
Ecology
Holly J. Curtinrich, Stephen D. Sebestyen, Natalie A. Griffiths, Steven J. Hall
Summary: Iron plays a crucial role in stabilizing carbon, phosphorus, and nutrient cations in terrestrial-aquatic interfaces and potentially releasing them through redox cycling. The impact of Fe redox cycling on carbon and nutrient dynamics is significant in peatlands, and warmer temperatures can promote the release of carbon and nutrients in these ecosystems.
Article
Ecology
Matt T. Trentman, Jennifer L. Tank, Robert T. Davis, Brittany R. Hanrahan, Ursula H. Mahl, Sarah S. Roley
Summary: This study reveals that water column turbidity is a significant factor affecting stream metabolism, with increased vegetative cover reducing turbidity and enhancing gross primary production and ecosystem respiration. During storms, these effects are even more pronounced.
Article
Water Resources
Jonathan M. Stelling, Stephen D. Sebestyen, Natalie A. Griffiths, Carl P. J. Mitchell, Mark B. Green
Summary: The new data set from the Marcell Experimental Forest (MEF) compiles water isotope measurements from multiple research catchments, primarily focused on three peatlands (S1, S2, S6) over an 11-year period. These data are publicly available and will be expanded upon in the future.
HYDROLOGICAL PROCESSES
(2021)
Article
Water Resources
Paul G. Matson, Louise M. Stevenson, Natalie A. Griffiths, Christopher R. DeRolph, R. Trent Jett, Allison M. Fortner, Michael W. Jones, Nikki J. Jones, Teresa J. Mathews
Summary: Human activities can have significant impacts on catchment ecosystems, prompting the development of the Oak Ridge National Laboratory's Biological Monitoring and Abatement Program (BMAP) to assess compliance with environmental regulations and mitigate adverse ecological impacts. BMAP focuses on multiple watersheds containing small to mid-size streams, utilizing an integrated approach to determine stream health and providing valuable long-term data on degradation and recovery in catchment ecosystems.
HYDROLOGICAL PROCESSES
(2021)
Article
Environmental Sciences
Daniel M. Ricciuto, Xiaofeng Xu, Xiaoying Shi, Yihui Wang, Xia Song, Christopher W. Schadt, Natalie A. Griffiths, Jiafu Mao, Jeffrey M. Warren, Peter E. Thornton, Jeff Chanton, Jason K. Keller, Scott D. Bridgham, Jessica Gutknecht, Stephen D. Sebestyen, Adrien Finzi, Randall Kolka, Paul J. Hanson
Summary: Environmental changes are expected to have significant impacts on carbon cycling in peatlands, affecting terrestrial-climate feedback. A new microbial-functional group-based CH4 module has been incorporated into the ELM model to simulate CH4 fluxes, accurately reproducing observed data. These findings will help improve Earth system model predictions for high-carbon ecosystems.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Engineering, Environmental
Caroline E. Pierce, Olha S. Furman, Sarah L. Nicholas, Jill Coleman Wasik, Caitlin M. Gionfriddo, Ann M. Wymore, Stephen D. Sebestyen, Randall K. Kolka, Carl P. J. Mitchell, Natalie A. Griffiths, Dwayne A. Elias, Edward A. Nater, Brandy M. Toner
Summary: We investigated the composition and spatial correlation of sulfur and mercury pools in peatland soil profiles. Our findings suggest that organic sulfur species play an important role in mercury methylation processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
David M. Costello, Scott D. Tiegs, Luz Boyero, Cristina Canhoto, Krista A. Capps, Michael Danger, Paul C. Frost, Mark O. Gessner, Natalie A. Griffiths, Halvor M. Halvorson, Kevin A. Kuehn, Amy M. Marcarelli, Todd Royer, Devan M. Mathie, Ricardo J. Albarino, Clay P. Arango, Jukka Aroviita, Colden Baxter, Brent J. Bellinger, Andreas Bruder, Francis J. Burdon, Marcos Callisto, Antonio Camacho, Fanny Colas, Julien Cornut, Veronica Crespo-Perez, Wyatt F. Cross, Alison M. Derry, Michael M. Douglas, Arturo Elosegi, Elvira Eyto, Veronica Ferreira, Carmen Ferriol, Tadeusz Fleituch, Jennifer J. Follstad Shah, Andre Frainer, Erica A. Garcia, Liliana Garcia, Pavel E. Garcia, Darren P. Giling, R. Karina Gonzales-Pomar, Manuel A. S. Graca, Hans-Peter Grossart, Francois Guerold, Luiz U. Hepp, Scott N. Higgins, Takuo Hishi, Carlos Iniguez-Armijos, Tomoya Iwata, Andrea E. Kirkwood, Aaron A. Koning, Sarian Kosten, Hjalmar Laudon, Peter R. Leavitt, Aurea L. Lemes da Silva, Shawn J. Leroux, Carri J. LeRoy, Peter J. Lisi, Frank O. Masese, Peter B. McIntyre, Brendan G. McKie, Adriana O. Medeiros, Marko Milisa, Yo Miyake, Robert J. Mooney, Timo Muotka, Jorge Nimptsch, Riku Paavola, Isabel Pardo, Ivan Y. Parnikoza, Christopher J. Patrick, Edwin T. H. M. Peeters, Jesus Pozo, Brian Reid, John S. Richardson, Jose Rincon, Geta Risnoveanu, Christopher T. Robinson, Anna C. Santamans, Gelas M. Simiyu, Agnija Skuja, Jerzy Smykla, Ryan A. Sponseller, Franco Teixeira-de Mello, Sirje Vilbaste, Veronica D. Villanueva, Jackson R. Webster, Stefan Woelfl, Marguerite A. Xenopoulos, Adam G. Yates, Catherine M. Yule, Yixin Zhang, Jacob A. Zwart
Summary: Microbes play a critical role in plant litter decomposition and the fate of carbon in rivers and riparian zones. The process of nutrient immobilization, whereby microbes acquire nitrogen and phosphorus from the environment during the decomposition of low-nutrient plant litter, is influenced by nutrient loading and changing climate. However, environmental controls on immobilization are poorly understood due to the complex interplay between environmental factors and plant litter chemistry.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Ecology
Sarah J. Shelley, Deanne J. Brice, Colleen M. Iversen, Randy K. Kolka, Stephen D. Sebestyen, Natalie A. Griffiths
Summary: Bryophytes play a crucial role in carbon accumulation in peatland ecosystems. Intrinsic and extrinsic factors both influence moss decomposition, with intrinsic characteristics driving early decay stages and extrinsic factors becoming more important over time. Longer-term studies are needed to fully understand the complexities of moss decay and inform carbon and climate models.
Article
Environmental Sciences
Rachel M. Wilson, Natalie A. Griffiths, Ate Visser, Karis J. McFarlane, Stephen D. Sebestyen, Keith C. Oleheiser, Samantha Bosman, Anya M. Hopple, Malak M. Tfaily, Randall K. Kolka, Paul J. Hanson, Joel E. Kostka, Scott D. Bridgham, Jason K. Keller, Jeffrey P. Chanton
Summary: Climate warming accelerates degradation of peatlands, leading to increased emissions of CO2 and CH4. The experiment showed that heating the peat bog to +9 degrees C over 7 years resulted in higher turnover of C and increased emissions of CO2 and CH4, particularly due to microbial respiration of ancient peat C. The findings suggest that warming can potentially shift peatlands from a net C sink to a C source, impacting peatland-climate feedbacks.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Ecology
Edward B. Rastetter, Bonnie L. Kwiatkowski, David W. Kicklighter, Audrey Barker Plotkin, Helene Genet, Jesse B. Nippert, Kimberly O'Keefe, Steven S. Perakis, Stephen Porder, Sarah S. Roley, Roger W. Ruess, Jonathan R. Thompson, William R. Wieder, Kevin Wilcox, Ruth D. Yanai
Summary: In this study, the Multiple Element Limitation (MEL) model was used to examine the responses of 12 ecosystems to elevated CO2, warming, and changes in precipitation. The results showed that ecosystems responded synergistically to the combined effects of elevated CO2, warming, and decreased precipitation, while the response to the combined effects of elevated CO2, warming, and increased precipitation was additive. The study also analyzed the factors attributing to changes in ecosystem carbon based on nitrogen and phosphorus, and found that different ecosystems exhibit different C-nutrient interactions, which shape their carbon sequestration under simulated global change.
ECOLOGICAL APPLICATIONS
(2022)
Article
Ecology
Colleen M. Iversen, John Latimer, Deanne J. Brice, Joanne Childs, Holly M. Vander Stel, Camille E. Defrenne, Jake Graham, Natalie A. Griffiths, Avni Malhotra, Richard J. Norby, Keith C. Oleheiser, Jana R. Phillips, Verity G. Salmon, Stephen D. Sebestyen, Xiaojuan Yang, Paul J. Hanson
Summary: Warming is found to exponentially increase plant-available ammonium and phosphate in a peatland ecosystem, with no effect from elevated CO2 levels. The dynamics of nutrient availability are influenced by peat depth and microtopography. Future predictions of peatland nutrient availability should take into account dynamic changes in nutrient acquisition by plants and microbes, as well as peat depth and microtopography.
Article
Ecology
Erica A. H. Bakker, Carmella Vizza, Clay P. Arango, Sarah S. Roley
Summary: This study investigated the nitrogen fixation in low-N streams in the Cascade Mountains. It identified three dominant groups of nitrogen-fixing organisms and measured their nitrogen fixation rates using acetylene reduction assay and N-15(2) calibration. The study found that sediment heterotrophs and cyanobacteria colonies contributed significantly to stream nitrogen availability.
FRESHWATER BIOLOGY
(2022)
Review
Biodiversity Conservation
Rachel M. Pilla, Natalie A. Griffiths, Lianhong Gu, Shih-Chieh Kao, Ryan McManamay, Daniel M. Ricciuto, Xiaoying Shi
Summary: Inland waters play an important role in connecting terrestrial landscape and oceans, but their contribution to global carbon budgets is often overlooked. This study synthesizes recent estimates of carbon fluxes in different types of inland waterbodies and highlights the impact of anthropogenic pressures on these fluxes. The study also recommends research priorities for better understanding and quantification of carbon fluxes in response to climate and landscape changes.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Environmental Sciences
Natalie A. Griffiths, Peter S. Levi, Jeffery S. Riggs, Christopher R. DeRolph, Allison M. Fortner, Jason K. Richards
Summary: The deployment of the unmanned surface vehicle (USV)-water quality measurement platform (the AquaBOT) provided longitudinal profiling of water quality in low-to mid-order streams. The AquaBOT data showed spatial patterns and heterogeneity in water quality parameters, such as nitrate concentration, and had higher spatial resolution compared to grab sampling data.
