A5025464681- Aquatic Ecosystems and Phytoplankton Dynamics
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Water Quality and Resources Studies
- Water Quality and Pollution Assessment
- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Ecosystems and Biodiversity
- Hydrology and Watershed Management Studies
- Marine Toxins and Detection Methods
- Water Quality Monitoring and Analysis
- Biocrusts and Microbial Ecology
- Microbial Community Ecology and Physiology
- Aquatic Invertebrate Ecology and Behavior
- Nonmelanoma Skin Cancer Studies
- Atmospheric and Environmental Gas Dynamics
- Groundwater flow and contamination studies
- Groundwater and Isotope Geochemistry
- Diatoms and Algae Research
- Soil erosion and sediment transport
- Climate Change and Health Impacts
- Isotope Analysis in Ecology
- Effects of Radiation Exposure
- Chemotherapy-related skin toxicity
- Bone and Dental Protein Studies
United States Geological Survey
2014-2024
University of Missouri
2004-2024
New York Water Science Center
2021-2024
Kansas Water Science Center
2010-2018
Entertainment Industries Council
2016-2018
United States Army Corps of Engineers
2017
Kansas Department of Health and Environment
2017
St George Hospital
2003-2013
Colorado Permanente Medical Group
2010
Environmental Protection Agency
2008
The mixtures of toxins and taste-and-odor compounds present during cyanobacterial blooms are not well characterized particular concern when evaluating potential human health risks. Cyanobacterial were sampled in twenty-three Midwestern United States lakes analyzed for community composition, thirteen cyanotoxins by liquid chromatography/mass spectrometry immunoassay, two gas spectrometry. Aphanizomenon, Cylindrospermopsis and/or Microcystis dominant most (96%) blooms, but composition was...
Cyanotoxins occur in rivers worldwide but are understudied lotic ecosystems relative to lakes and reservoirs. We sampled 11 large river sites located throughout the United States during June–September 2017 determine occurrence of cyanobacteria with known cyanotoxin-producing strains, cyanotoxin synthetase genes, cyanotoxins. Chlorophyll a concentrations ranged from oligotrophic eutrophic (0.5–64.4 µg L−1). Cyanobacteria were present algal communities all (82% samples, n = 50) rarely...
Algal blooms around the world are increasing in frequency and severity, often with possibility of adverse effects on human ecosystem health. The health economic impacts associated harmful algal blooms, or HABs, provide compelling rationale for developing new methods monitoring these events via remote sensing. Although concentrations chlorophyll-a key pigments like phycocyanin routinely estimated from satellite images used to infer cyanobacterial cell counts, current unable information...
To determine whether the inhalation of aromatherapy during radiotherapy reduces anxiety.Three hundred thirteen patients undergoing were randomly assigned to receive either carrier oil with fractionated oils, only, or pure essential oils lavender, bergamot, and cedarwood administered by concurrently radiation treatment. Patients underwent assessment Hospital Anxiety Depression Scale (HADS) Somatic Psychological Health Report (SPHERE) at baseline treatment completion.There no significant...
Recent studies have shown that the total nitrogen to phosphorus (TN:TP) ratio and oxidation state may substantial effects on secondary metabolite (e.g., microcystins) production in cyanobacteria. We investigated relationship between water column TN:TP cyanobacterial metabolites geosmin, 2-methylisoborneol (MIB), microcystin using multiple years of data from 4 reservoirs located Midwestern United States. also examined concentrations chemically oxidized (NO3) reduced (NH3) nitrogen, NO3:NH3...
Harris TD, Graham JL. 2017. Predicting cyanobacterial abundance, microcystin, and geosmin in a eutrophic drinking-water reservoir using 14-year dataset. Lake Reserve Manage. 33:32-48.Cyanobacterial blooms degrade water quality drinking supply reservoirs by producing toxic taste-and-odor causing secondary metabolites, which ultimately cause public health concerns lead to increased treatment costs for utilities. There have been numerous attempts create models that predict cyanobacteria their...
Land use and climate change are anticipated to affect phytoplankton of lakes worldwide. The effects will depend on the magnitude projected land changes lake sensitivity these factors. We used random forests fit with long-term (1971–2016) cyanobacteria abundance time series, observations (1971–2016), upstream catchment (global Clumondo models for year 2000) data from 14 European 15 North American basins. future in 29 focal basins 1567 across regions based three (sustainability, middle road,...
Cyanobacteria are the most common toxigenic algae in inland waters. Their toxins can affect health of aquatic and terrestrial organisms, including humans. Other algal groups, such as haptophytes (e.g., Prymnesium parvum) euglenoids Euglena sanguinea), also form harmful blooms (HABs) whose cause injury to biota but currently have no known effects on human health. parvum, however, is responsible for some worst HAB-related ecological disasters recorded Here, we provide an overview primary found...
Abstract Cyanobacteria and cyanotoxin producing cyanobacterial blooms are a trending focus of current research. Many studies on bloom events in lentic environments such as lakes or ponds. Comparatively few have explored lotic fewer still examined the communities potential producers during ambient, non-bloom conditions. Here we used metagenomics-based approach to profile microbial cyanobacteria 12 major U.S. rivers at multiple time points summer months 2019. Our data show that possess...
ABSTRACT While commonplace in clinical settings, DNA-based assays for identification or enumeration of drinking water pathogens and other biological contaminants remain widely unadopted by the monitoring community. In this study, shotgun metagenomics was used to identify taste-and-odor producers toxin-producing cyanobacteria over a 2-year period reservoir. The sequencing data implicated several cyanobacteria, including Anabaena spp., Microcystis an unresolved member order Oscillatoriales as...
Abstract Measurement of planktonic chlorophyll‐ a —a proxy for algal biomass—in rivers may represent local production or algae transported from upstream, confounding understanding bloom development in flowing waters. We modeled 3 years transport through 394‐km portion the Illinois River and found that although biomass is longitudinally widespread, most net occurs at river control points upper reaches (up to 3.7 Mg y −1 km ). Up 69% was result within‐reach production, with remainder recruited...
Cyanobacteria and associated toxins taste-and-odor compounds are of increasing environmental concern. However, consistent guidelines for the development studies assessing cyanobacterial presently not available. This report provides guidance scientific cyanobacteria by-products in lakes reservoirs. Topics include: background information on cyanobacteria, toxins, compounds; spatial temporal considerations that unique to reservoirs; common study types, objectives, approaches general collecting...
Abstract A global dataset was compiled to examine relations between the total nitrogen phosphorus ratio (TN:TP) and microcystin concentration in lakes reservoirs. Microcystin decreased as TN:TP ratios increased, suggesting that manipulation of may reduce concentrations. This relationship experimentally tested by adding ammonium nitrate increase large-scale (70 m3), situ mesocosms located a eutrophic reservoir routinely experiences toxic blooms cyanobacteria. At >75:1, chlorophytes dominated...
First posted November 6, 2015 For additional information, contact: Director, Ohio Water Science Center U.S. Geological Survey 6480 Doubletree Ave Columbus, OH 43229-1111 http://oh.water.usgs.gov/ Harmful cyanobacterial “algal” blooms (cyanoHABs) and associated toxins, such as microcystin, are a major water-quality issue for Lake Erie inland lakes in Ohio. Predicting when where bloom may occur is important to protect the public that uses consumes water resource; however, predictions...
The spatiotemporal distribution of harmful algal blooms (HABs) in rivers remains poorly understood, and there is an urgent need to develop a consistent set metrics better document HAB occurrences forecast future events. Using data from seven sites the Illinois River Basin, we computed focused on conditions related excess growth hypoxia. Daily mean chlorophyll dissolved oxygen (DO) concentrations, gross primary productivity (GPP), net ecosystem (NEP) rates, water quality status, identifying...
First posted May 23, 2024 For additional information, contact: Director, Water Resources Mission AreaU.S. Geological Survey12201 Sunrise Valley DriveReston, VA 20192Contact Pubs Warehouse Algal blooms in water, soils, dusts, and the environment have captured national attention because of concerns associated with exposure to algal toxins for humans animals. naturally occur all surface-water types are important primary producers aquatic ecosystems. However, excessive algae growth can be many...