Article
Ecology
Neal D. Mundahl, Erik D. Mundahl
Summary: The study revealed that agriculture-dominated karst areas had significant negative impacts on stream habitats and biota, with over half of the sites showing degradation. Wide riparian buffers and avoidance of groundwater influence have allowed for some recovery in certain stream reaches, but more buffers and soil conservation practices are needed to protect additional stream segments and biota. New stream buffer laws have resulted in establishment of vegetated buffers at all study sites, potentially leading to improved habitat and biotic communities in the future.
ECOLOGICAL PROCESSES
(2022)
Article
Environmental Sciences
Jennifer L. Williamson, Andrew Tye, Dan J. Lapworth, Don Monteith, Richard Sanders, Daniel J. Mayor, Chris Barry, Mike Bowes, Michael Bowes, Annette Burden, Nathan Callaghan, Gareth Farr, Stacey Felgate, Alice Fitch, Stuart Gibb, Pete Gilbert, Geoff Hargreaves, Patrick Keenan, Vassilis Kitidis, Monika Juergens, Adrian Martin, Ian Mounteney, Philip D. Nightingale, M. Gloria Pereira, Justyna Olszewska, Amy Pickard, Andrew P. Rees, Bryan Spears, Mark Stinchcombe, Debbie White, Peter Williams, Fred Worrall, Chris Evans
Summary: This study provides a comprehensive assessment of riverine dissolved organic carbon (DOC) export in Great Britain, revealing that smaller river systems draining peat-rich areas are underestimated in global syntheses. The study also highlights the significant influence of upland conifer plantation forestry on the spatial distribution of DOC exports. These findings have implications for future assessments of CO2 sequestration potential and climate change mitigation strategies.
Article
Environmental Sciences
D. W. Clow, G. A. Akie, R. G. Striegl, C. A. Penn, G. A. Sexstone, G. L. Keith
Summary: This study measured aquatic carbon fluxes in mountain headwater streams and used a geostatistical analysis to determine how landscape characteristics influence these fluxes. The findings showed that wetlands have a positive influence on aquatic carbon fluxes, while perennial snow/ice has a negative effect. Mean annual temperature and precipitation also have impacts on aquatic carbon fluxes. Furthermore, dissolved organic matter and bicarbonate ions in the water showed strong dynamic responses to snowmelt and rain events.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Wafa Laffet, Andrea Prentice, Luc Tremblay
Summary: The priming effect (PE) has been extensively studied in soils but has contradictory results in aquatic ecosystems. Our experiments showed that the presence of easily degradable labile dissolved organic matter (LDOM) can significantly increase the biodegradation rate of nonlabile DOM (NLDOM), but this effect is only observed with specific types of LDOM. Microbial use of LDOM produces new microbial NLDOM that should be considered for accurate PE measurements. This temporary PE can have significant impacts on CO2 production in areas with frequent additions of LDOM. The addition of a new microbial inoculum had a stronger effect than adding LDOM or the PE.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Biodiversity Conservation
Isolde Callisto Puts, Jenny Ask, Matthias B. Siewert, Ryan A. Sponseller, Dag O. Hessen, Ann-Kristin Bergstrom
Summary: Global change affects gross primary production in benthic and pelagic habitats of northern lakes by influencing catchment characteristics and lake water biogeochemistry. Changes in key environmental drivers manifest in light limitation of total GPP and the relative size of the benthic habitat. External inputs of inorganic carbon can influence lake productivity patterns independent of terrestrial DOC supply.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Environmental Sciences
Mahmood Sadat-Noori, Helen Rutlidge, Martin S. Andersen, William Glamore
Summary: Research on the largest urban freshwater lake in the metropolitan area of Sydney revealed that the lake system is a source of CO2 and CH4 to the atmosphere. Groundwater discharge plays a significant role in greenhouse gas emissions from the lake, contributing 25% of CO2 and 13% of CH4 emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Astronomy & Astrophysics
Kaj Sand-Jensen, Tenna Riis, Johan Emil Kjaer, Kenneth Thoro Martinsen
Summary: Streams in cultivated lowlands are often saturated with CO2, but the concentrations decrease downstream with rising water temperature, chlorophyll a concentration, and decreasing groundwater inputs. CO2 concentrations at the outlet of lakes can be reduced due to phytoplankton uptake and atmospheric loss. Plant uptake of CO2 is observed to occur in summer and in the afternoons. Sites with deeper water and low gas transfer velocity retain high CO2 concentrations. The variation in CO2 emission rates in fluvial networks is influenced by various physical, chemical and biological processes.
EARTH AND SPACE SCIENCE
(2022)
Article
Environmental Sciences
Seung-Cheol Lee, Yera Shin, Young-Joon Jeon, Eun-Ju Lee, Jae-Sung Eom, Bomchul Kim, Neung-Hwan Oh
Summary: The study found that forest and agricultural land use impact the concentration and composition of dissolved organic carbon (DOC) in stream during storm events; agricultural streams have lower peak DOC values than forest streams, indicating weaker response to hydrological changes; agricultural watersheds export more protein-like DOM compared to forested streams.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Lluis Gomez-Gener, Erin R. Hotchkiss, Hjalmar Laudon, Ryan A. Sponseller
Summary: The study utilized 7 years of data from three boreal catchments to investigate how different land-water interfaces modulate carbon concentration in streams and the balance among different forms. Results showed seasonal patterns and C-Q relationships varied across catchments, with different mechanisms regulating the different forms of carbon.
WATER RESOURCES RESEARCH
(2021)
Article
Biodiversity Conservation
Hu Liu, Jia Liu, Jing Hu, Yunning Cao, Shangbin Xiao, Weiguo Liu
Summary: The C-13 values of aquatic plants in lakes are important for understanding carbon cycles and environmental changes. This study evaluated the influence of carbon sources' C-13 values on their C-13 differences, revealing that it is not the main factor determining the C-13 difference between different aquatic plant species. This finding contributes to the understanding of C-13 variations in carbon cycles and paleoenvironment reconstructions for lakes.
ECOLOGICAL INDICATORS
(2022)
Editorial Material
Environmental Sciences
William C. Daniels
Summary: Paleoclimatologists use lake sediments to reconstruct past changes in precipitation and evaporation. Recent research in Arctic lakes shows that aquatic plants contribute significantly to the wax signals, providing a method for identifying the sources of plant waxes in these lakes.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2022)
Article
Biology
Joao Paulo S. Pinheiro, Fredric M. Windsor, Rod W. Wilson, Charles R. Tyler
Summary: Chemical pollution poses a major threat to global freshwater biodiversity, with the physico-chemical features of natural fresh waters playing a crucial role in influencing environmental risk and toxicity to aquatic wildlife. Understanding the variability of these features in natural fresh waters is essential for accurate environmental risk assessment and protection of organisms.
BIOLOGICAL REVIEWS
(2021)
Article
Environmental Sciences
Arun Looman, Damien T. Maher, Isaac R. Santos
Summary: This study investigated the small-scale spatial variability in dissolved carbon dioxide (CO2) and water-air CO2 flux dynamics in first-order catchments of the upper Blue Mountains Plateau in New South Wales, Australia. The results showed that wetlands and lakes had the highest CO2 supersaturation, while CO2 approached atmospheric equilibrium at escarpment waterfalls. High resolution sampling was essential in identifying CO2 outgassing hotspots, with over 95% of excess dissolved CO2 outgassed to the atmosphere in these geomorphically diverse catchments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Ecology
Peter D. F. Isles, Irena F. Creed, Anders Jonsson, Ann-Kristin Bergstrom
Summary: The study found that increasing dissolved organic carbon (DOC) in northern lakes will likely lead to increases in phytoplankton biomass, but its effects depend on the trade-offs between light availability and nutrient supply; seasonal changes play a crucial role in the relationship between DOC and phytoplankton biomass, with a clear unimodal relationship observed in the fall.
Article
Engineering, Environmental
Ana Previsic, Marina Vilenica, Natalija Vuckovic, Mira Petrovic, Marko Rozman
Summary: The study provides evidence of the transfer of pharmaceuticals and endocrine disruptors through the aquatic-terrestrial habitat by emerging aquatic insects. Adult Trichoptera, an important food source for riparian predators, showed increased body burden of these contaminants. The transfer of these contaminants from aquatic primary producers to terrestrial predators may impact their physiology and population dynamics.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Limnology
Shin-Ichiro S. Matsuzaki, Richard C. Lathrop, Stephen R. Carpenter, Jake R. Walsh, M. Jake Vander Zanden, Mark R. Gahler, Emily H. Stanley
Summary: This study found that climate change and food web structure can impact the significant clear-water phase in lakes, with effects varying among different metrics. Higher water temperature leads to earlier start and peak dates of the clear-water phase, while the proportion of D. pulicaria affects all clear-water phase metrics, and high Bythotrephes density delays the start date of the clear-water phase.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Ecology
Jean-Francois Lapierre, Sarah M. Collins, Samantha K. Oliver, Emily H. Stanley, Tyler Wagner
Summary: Multiple studies have shown widespread browning of Northern Hemisphere lakes. An examination of Northeastern U.S. lakes found that the majority of lakes have experienced an increase in both DOC and color, with variable trends and no strong correlation between them, suggesting other factors beyond terrestrial carbon loading may be at play. Browning may be more prominent in regions where climate and atmospheric deposition are dominant drivers.
Article
Environmental Sciences
Simon N. Topp, Tamlin M. Pavelsky, Emily H. Stanley, Xiao Yang, Claire G. Griffin, Matthew R. Ross
Summary: Current research on freshwater resources globally indicates a deteriorating water quality, with studies often focusing on large water bodies and using biased sampling data. In the United States, satellite remote sensing data reveals an increasing trend in lake water clarity since 1984, particularly in densely populated areas and smaller water bodies pre-2000. This suggests that extensive pollution control measures in the U.S. have been effective in improving water quality.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Editorial Material
Ecology
Ellen A. R. Welti, Anthony Joern, Aaron M. Ellison, David C. Lightfoot, Sydne Record, Nicholas Rodenhouse, Emily H. Stanley, Michael Kaspari
NATURE ECOLOGY & EVOLUTION
(2021)
Article
Limnology
Noah R. Lottig, Joseph S. Phillips, Ryan D. Batt, Facundo Scordo, Tanner J. Williamson, Stephen R. Carpenter, Sudeep Chandra, Paul C. Hanson, Chistopher T. Solomon, Michael J. Vanni, Jacob Zwart
Summary: This study compared the estimates of primary production using C-14 incubations and free-water O-2 methods in lake ecosystems, finding that 61% of the C-14 production estimates overlapped with the free-water O-2 production estimates within the 95% credible intervals. There was little difference in the daily estimates of primary production based on the selection of free-water O-2 or C-14 approaches in these lakes during summer stratified conditions.
LIMNOLOGY AND OCEANOGRAPHY-METHODS
(2022)
Article
Environmental Sciences
Facundo Scordo, Noah R. Lottig, Juan E. Fiorenza, Joshua Culpepper, James Simmons, Carina Seitz, Edward M. Krynak, Erin Suenaga, Sudeep Chandra
Summary: The littoral habitat of lakes plays an important role in the response to hydroclimatic variability and overall lake productivity. Dry and wet years result in decreased productivity and consumer biomass in the littoral habitat.
WATER RESOURCES RESEARCH
(2022)
Article
Multidisciplinary Sciences
Liwei Zhang, Sibo Zhang, Xinghui Xia, Tom J. Battin, Shaoda Liu, Qingrui Wang, Ran Liu, Zhifeng Yang, Jinren Ni, Emily H. Stanley
Summary: This study investigated the concentrations and fluxes of N2O in four watersheds on the East Qinghai-Tibet Plateau between 2016 and 2018. The findings show that permafrost rivers in this region release relatively low levels of N2O, despite the high N2O emissions from thawing permafrost soils. This is attributed to the uptake of dissolved inorganic N by terrestrial plants, unfavorable conditions for N2O generation through denitrification, and a low N2O yield due to a small ratio of nitrite reductase to nitrous oxide reductase in these rivers. The study estimates the fluvial N2O emissions from permafrost landscapes on the entire Qinghai-Tibet Plateau to be relatively small, but suggests that these permafrost-affected rivers may become significant sources of N2O in the future, contributing to the permafrost non-carbon feedback that intensifies warming.
NATURE COMMUNICATIONS
(2022)
Article
Fisheries
Zachary S. Feiner, Hilary A. Dugan, Noah R. Lottig, Greg G. Sass, Gretchen A. Gerrish
Summary: Climate change is affecting phenological events in aquatic ecosystems, increasing variability and unpredictability. Understanding the responses of aquatic communities to variable phenology is crucial for conservation and management of resilient aquatic ecosystems.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2022)
Article
Ecology
C. D. Buelo, M. L. Pace, S. R. Carpenter, E. H. Stanley, D. A. Ortiz, D. T. Ha
Summary: The study finds that temporal Early Warning Statistics (EWS) can provide advanced warning of algal blooms, helping managers to prepare and minimize negative impacts.
ECOLOGICAL APPLICATIONS
(2022)
Article
Limnology
Robert Ladwig, Alison P. Appling, Austin Delany, Hilary A. Dugan, Qiantong Gao, Noah Lottig, Jemma Stachelek, Paul C. Hanson
Summary: This study investigates the metabolism patterns of lakes in Wisconsin, USA, and compares the differences in metabolic trends between oligotrophic and eutrophic lakes. The results show that oligotrophic lakes have diverse metabolism patterns, while eutrophic lakes exhibit consistent long-term trends of increased oxygen consumption over the last decade. The landscape setting is identified as the primary driver of long-term metabolic change.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Limnology
Amanda G. DelVecchia, Spencer Rhea, Kelly S. Aho, Emily H. Stanley, Erin R. Hotchkiss, Alice Carter, Emily S. Bernhardt
Summary: Streams and rivers are major sources of greenhouse gas emissions. While our understanding of individual gas flux drivers has improved, the lack of consistently collected samples hinders our ability to analyze the interrelationship between gas concentrations and their drivers. This study analyzed a dataset collected by the National Ecological Observatory Network, providing insights into the physical and biogeochemical drivers of greenhouse gas production in 27 streams and rivers across the United States. The results show that physical drivers such as temperature, stream slope, dissolved oxygen, and total nitrogen concentration strongly influence the concentrations of CO2 and CH4, while N2O is exclusively correlated with total nitrogen concentration.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Limnology
Ellie Socha, Adrianna Gorsky, Noah R. Lottig, Gretchen Gerrish, Emily C. Whitaker, Hilary A. Dugan
Summary: Previously overlooked, winter is now recognized as a significant period of biological activity in north-temperate lakes. Research suggests that changes in ice cover duration and snow conditions could have substantial impacts on aquatic ecosystems. This study investigates the potential consequences of changing ice and snow dynamics on aquatic biological communities, specifically focusing on lower trophic levels.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Multidisciplinary Sciences
Gerard Rocher-Ros, Emily H. Stanley, Luke C. Loken, Nora J. Casson, Peter A. Raymond, Shaoda Liu, Giuseppe Amatulli, Ryan A. Sponseller
Summary: Methane emissions from running waters account for a significant portion of global emissions and are influenced by edaphic and climate features. These emissions are not strongly temperature dependent and are characterized by large fluxes in different environments.
Article
Geosciences, Multidisciplinary
Emily H. Stanley, Luke C. Loken, Nora J. Casson, Samantha K. Oliver, Ryan A. Sponseller, Marcus B. Wallin, Liwei Zhang, Gerard Rocher-Ros
Summary: Despite their small size, fluvial ecosystems play a significant role in carbon processing and methane emissions. However, progress in understanding and estimating methane concentrations and fluxes in streams and rivers has been slow due to variability and limited data availability. In order to address these challenges, the Global River Methane Database (GriMeDB) provides a comprehensive resource of methane concentrations and fluxes, along with physical and chemical data, to examine environmental drivers and estimate fluvial contributions to methane emissions.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Limnology
Jean-Francois Lapierre, Katherine E. Webster, Ephraim M. Hanks, Tyler Wagner, Patricia A. Soranno, Ian M. Mccullough, Kaitlin L. Reinl, Marcella Domka, Noah R. Lotting
Summary: A new geographic classification approach was developed for lakes in the conterminous U.S., based on lake archetypes representing extreme points along gradients of multiple geographic features. Seven lake archetypes were identified, and individual lakes were assigned weights for each archetype. This approach improved understanding and prediction of lake responses to environmental drivers, and outperformed global models and ecoregion classifications.
LIMNOLOGY AND OCEANOGRAPHY
(2023)