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Records 1 to 25 of 250

Geographic variation in projected US forest aboveground carbon responses to climate change and atmospheric deposition
(JOURNAL) [Published : Feb 20, 2024]
Forest composition and ecosystem services are sensitive to anthropogenic pressures like climate change and atmospheric deposition of nitrogen (N) and sulfur (S). Here we extend recent forest projections for the current cohort of trees in the contiguous US, characterizing potentia...
Sensitive tree species remain at risk despite improved air quality benefits to US forests
(JOURNAL) [Published : Aug 21, 2023]
Atmospheric nitrogen (N) and sulfur (S) deposition can significantly affect forest biodiversity and production by altering the growth and survival of trees. Three decades of air quality regulations in the United States have led to large reductions in oxides of N (44–81%) an...
Evaluating the effects of climate change and chemical, physical, and biological stressors on nearshore coral reefs: A case study in the Great Barrier Reef, Australia
(JOURNAL) [Published : Nov 29, 2023]
An understanding of the combined effects of climate change (CC) and other anthropogenic stressors, such as chemical exposures, is essential for improving ecological risk assessments of vulnerable ecosystems. In the Great Barrier Reef, coral reefs are under increasingly severe dur...
Future climate change effects on U.S. forest composition may offset benefits of reduced atmospheric deposition of N and S
(JOURNAL) [Published : Jul 07, 2023]
Climate change and atmospheric deposition of nitrogen (N) and sulfur (S) are important drivers of forest demography. Here we apply previously derived growth and survival responses for 94 tree species, representing >90% of the contiguous US forest basal area, to project how cha...
Watershed-scale changes in terrestrial nitrogen cycling during a period of decreased atmospheric nitrate and sulfur deposition
(JOURNAL) [Published : Dec 01, 2016]
During a period of decreased atmospheric N deposition, we assessed changes in forest N cycling by evaluating trends in tree-ring d15N values (between 1980 and 2010; n ¼ 20 trees per watershed), stream nitrate yields (between 2000 and 2011), and retention of atmospherically...
Impacts of nitrogen pollution on terrestrial ecosystems in the United States
(JOURNAL) [Published : Sep 01, 2015]
Nitrogen (N) has historically been the nutrient that most often limits plant growth in the United States. However, human activity since the Industrial Revolution has resulted in increased emission and hence deposition of N.1 Initial increases in N deposition can act as a fertiliz...
Comparing Drivers of Spatial Variability in U.S. Lake and Stream Phosphorus Concentrations
(JOURNAL) [Published : Jul 28, 2023]
Decision makers need to know the drivers of surface water phosphorus (P) concentrations, the environmental factors that mediate P loading in freshwater systems, and where pollution sources and mediating factors are co-located. Publicly available spatial datasets of P pollution so...
A review of ecosystem services from edge-of-field practices in tile-drained agricultural systems in the United States Corn Belt Region
(JOURNAL) [Published : Dec 15, 2023]
Edge-of-field management practices that reduce nutrient pollution from tile drainage while contributing habitat and other ecosystem services are needed to enhance US Corn Belt agricultural systems. In this review, we identified edge-of-field and catchment scale agricultural conse...
The changing nitrogen landscape of United States streams: Declining deposition and increasing organic nitrogen
(JOURNAL) [Published : Jan 01, 2024]
Air quality regulations decreased nitrogen (N) and sulfur deposition across the conterminous United States (CONUS) during the last several decades. But it is unclear if declining deposition has also altered stream N at large scales. We compared watershed N inputs with N chemistry...
Potential vulnerability of 348 herbaceous species to atmospheric deposition of nitrogen and sulfur in the United States
(JOURNAL) [Published : Jul 01, 2019]
Atmospheric nitrogen (N) and sulfur (S) pollution increased greatly across industrialized temperate regions during much of the 20th century. Despite significant declines in recent decades, N and S deposition continue to negatively affect the distribution of many plant species. We...
Analysis of Microcystis aeruginosa physiology by spectral flow cytometry: Impact of chemical and light exposure
(JOURNAL) [Published : Oct 27, 2023]
M. aeruginosa fluorescent changes were observed using a Cytek Aurora spectral flow cytometer that contains 5 lasers and 64 narrow band detectors located between 365 and 829 nm. Cyanobacteria were treated with different concentrations of H2O2 and then monitored afte...
A New Approach to Predict Tributary Phosphorus Loads Using Machine Learning– and Physics-Based Modeling Systems.
(JOURNAL) [Published : Jul 01, 2023]
Tributary phosphorus (P) loads are one of the main drivers of eutrophication problems in freshwater lakes. Being able to predict P loads can aid in understanding subsequent load patterns and elucidate potential degraded water quality conditions in downstream surface waters. We de...
Wildfires in the western United States are mobilizing PM2.5-associated nutrients and may be contributing to downwind cyanobacteria blooms
(JOURNAL) [Published : May 15, 2023]
Wildfire activity is increasing and can be linked to climate change effects, including rising global temperatures and more frequent drought conditions. Wildfire emissions impact human health and sensitive ecosystems, particularly in the western United States where large fire freq...
A New Approach to Predict Tributary Phosphorus Loads Using Machine Learning– and Physics-Based Modeling Systems
(JOURNAL) [Published : Jul 01, 2023]
Tributary phosphorus (P) loads are one of the main drivers of eutrophication problems in freshwater lakes. Being able to predict P loads can aid in understanding subsequent load patterns and elucidate potential degraded water quality conditions in downstream surface waters. We de...
Yields and molecular composition of gas-phase and secondary organic aerosol from the photooxidation of the volatile consumer product benzyl alcohol: formation of highly oxygenated and hydroxy nitro-aromatic compounds
(JOURNAL) [Published : Apr 19, 2023]
Recently, volatile chemical products (VCPs) have been increasingly recognized as important precursors for secondary organic aerosol (SOA) and ozone in urban areas. However, their atmospheric chemistry, physical transformation, and their impact on climate, environment and human he...
Anaerobic digestate management, environmental impacts, and techno-economic challenges
(JOURNAL) [Published : Mar 01, 2022]
Digestate is a nutrient-rich by-product from organic waste anaerobic digestion but can contribute to nutrient pollution without comprehensive management strategies. Some nutrient pollution impacts include harmful algal blooms, hypoxia, and eutrophication. This contribution explor...
Sensitivity of Riparian Buffer Designs to Climate Change—Nutrient and Sediment Loading to Streams: A Case Study in the Albemarle-Pamlico River Basins (USA) Using HAWQS
(JOURNAL) [Published : Nov 09, 2021]
Riparian buffer zones (RBZs) provide multiple benefits to watershed ecosystems. We aimed to conduct an extensive sensitivity analysis of the RBZ designs to climate change nutrient and sediment loadings to streams. We designed 135 simulation scenarios starting with the six baselin...
Spatiotemporal variability in Swedish lake ecosystems
(JOURNAL) [Published : Mar 21, 2022]
Studying ecosystem dynamics is critical to monitoring and managing linked systems of humans and nature. Due to the growth of tools and techniques for collecting data, information on the condition of these systems is more widely available. While there are a variety of approaches f...
Improving the Characterization of the Natural Emissions in CMAQ
(JOURNAL) [Published : Oct 01, 2021]
The air quality of any given location is the result of complex interactions between meteorology and emissions through dynamical, physical, chemical, and photochemical processes. Of the many sources of air pollution, naturally produced emissions such as nitric oxide (NO) from soil...
Impacts of climate change on estuarine stratification and implications for hypoxia within a shallow subtropical system
(JOURNAL) [Published : Dec 05, 2022]
Vertical density stratification often plays an important role in the formation and expansion of coastal hypoxic zones through its effect on near-bed circulation and vertical oxygen flux. However, the impact of future climate change on estuarine circulation is widely unknown. Here...
A Machine Learning Approach to Predict Watershed Health Indices for Sediments and Nutrients at Ungauged Basins
(JOURNAL) [Published : Feb 02, 2023]
Effective water quality management and reliable environmental modeling depend on the availability, size, and quality of water quality (WQ) data. Observed stream water quality data are usually sparse in both time and space. Reconstruction of water quality time series using surroga...
In utero exposure to a mixture of the perfluoroalkylisopropyl pesticide pyrifluquinazon with dibutyl phthalatecumulatively disrupts male rat reproductive development via different mechanisms of action
(JOURNAL) [Published : Aug 01, 2022]
Administration of individual of chemicals and mixtures during sexual differentiation that disrupt the androgen signaling pathway can induce reproductive abnormalities in male rats.  In the current study we co-administered the heptafluoro-isopropyl pesticide pyrifluquinazon (...
Improved mapping of coastal salt marsh habitat change at Barnegat Bay (NJ, USA) using object-based image analysis of high-resolution aerial imagery
(JOURNAL) [Published : Jan 01, 2023]
Tidal wetlands are valued for the ecosystem services they provide yet are vulnerable to loss due to anthropogenic disturbances such as land conversion, hydrologic modifications, and the impacts of climate change, especially accelerating rates of sea level rise. To effectivel...
Simulating Hypoxia in a New England Estuary: WASP8 Advanced Eutrophication Module (Narragansett Bay, RI, USA)
(JOURNAL) [Published : Mar 20, 2023]
Anthropogenic sources of nutrients cause eutrophication in coastal waters. Narraganset Bay (USA), the largest estuary in New England, has large seasonal zones of hypoxia. In response, management strategies have been implemented to reduce nutrient loadings. In this study, a mechan...
Footprints in Action: How UVA is Managing its Sustainability Stewardship
(JOURNAL) [Published : Feb 23, 2023]
Evaluating sustainability stewardship at higher educational institutions is essential to working towards improving our environment. Many institutions have used environmental footprint indicators as a way to evaluate, track, and improve their impact on the environment. In this art...