Science Inventory

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Records with

  • Keyword = harmful algal blooms OR HABs.
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Records 1 to 25 of 211

Cyanobacterial community structure changes with seasonal mixing and dissolved oxygen dynamics in three urban eutrophic lakes. (PRESENTATION)
Nutrients contribute to the development of toxic cyanobacterial blooms yet information about other drivers is needed to better predict when and where blooms will occur. We monitored cyanobacterial community dynamics in three Gulf Coast urban lakes. The SW and SE lakes were both...
Eutrophication Model Development for Life Cycle Impact Assessment in the United States (ICOSSE '18 presentation) (PRESENTATION)
Eutrophication describes the buildup of excess nutrients, such as nitrogen and phosphorus, in a body of water. This buildup can lead to excess plant growth, such as harmful algal blooms (HABs), resulting in deficiency of dissolved oxygen (hypoxia), and in some cases the productio...
Overview of HABs Research Program (PRESENTATION)
This presentation is an overview of the cyanobacteria/harmful algal blooms research currently being performed within the Office of Research and Development's Safe and Sustainable Water Resources research program. The presentation highlights results in the following areas: lake m...
Lake Harsha: Three Years of HABs Monitoring (PRESENTATION)
USEPA’s Office of Research and Development has partnered with the Clermont County, OH Water Resources Department in an on-going study to assess HAB trends and develop monitoring tools and approaches. Lake Harsha, a multi-use reservoir and primary drinking water source in southwes...
Measuring Total Microcystins in Fish Tissue using the 2-methyl-3-methoxy-4-phenylbutyric acid (MMPB) procedure - Minneapolis (PRESENTATION)
There are limited methods for the analyses of multiple algal toxins in aquatic food webs, phytoplankton, zooplankton, periphyton, macroinvertebrates, forage fish, bottom feeders and top carnivore fish. Algal toxins in freshwater systems do not necessarily occur as single contamin...
US Environmental Protection Agency Efforts to address Harmful Algal Blooms (HABs) Impacting Drinking and Recreational Waters (NEWSLETTER ARTICLE)
This is a short article for a European cyanobacteria newsletter that discusses EPA efforts in the following areas: toxin monitoring in public water systems, toxin guidance values in drinking and recreational waters, and research in the areas of treatment, monitoring, methods deve...
pH dependent octanol–water partitioning coefficients of microcystin congeners (JOURNAL)
Hazardous algal blooms can generate toxic compounds with significant health impacts for exposed communities. The ubiquitous class of algal toxins known as microcystins exhibits significant heterogeneity in its peptide structure, which has been minimally studied, given the signifi...
Using Rapid Small Scale Column Testing to Evaluate Granular Activated Carbon Adsorption of Cyanotoxins from Drinking Water (PAPER IN NON-EPA PROCEEDINGS)
Increases in cyanotoxin containing harmful algal blooms in recent years has raised the level of concern within the water treatment industry to remove these dangerous bacteria and chemicals. Typical methods used to treat intracellular and extracellular cyanotoxins include pretreat...
Who messed up my lake? (PRESENTATION)
Initial results from a lake-wide agent based simulation releasing virtual drifters from multiple tributaries over time. We examine the use of agent based modeling to break down the sources contributing to the composition of nearshore waters. Knowing that flow is highly biased in ...
Evaluating Lake Superior nearshore offshore gradients using autonomous gliders (PRESENTATION)
Slocum electric gliders are autonomous vehicles capable of continuously mapping subsurface conditions at high resolution for months at a time. During the 2016 CSMI in Lake Superior, seven glider deployments were undertaken through a partnership between University of Minnesota Dul...
An approach to monitoring cyanobacteria blooms at surface drinking water intakes using satellite imagery (10th National Monitoring Conference) (PRESENTATION)
Cyanobacterial blooms occur worldwide and are associated with human respiratory irritation, undesirable taste and odor of potable water, increased drinking water treatment costs, loss of revenue from recreational use, and human illness as a result of ingestion or skin exposure du...
Satellite-based monitoring of cyanobacteria blooms from 2002–2011 for 11 reservoirs with watersheds along an agricultural gradient (PRESENTATION)
Imagery acquired by the Envisat Medium Resolution Imaging Spectrometer from 2002-2011 was used to estimate cyanobacteria cell densities for 11 reservoirs in Indiana, Ohio, and Kentucky, USA (surface areas 8–43 km2; 864 total images spanning May–September). This initia...
Using Satellite Data to Monitor the Impacts of CyanoHAB Events on Drinking Water: A Texas Case Study (PRESENTATION)
Overview of CYAN and it's mission to support the environmental management and public use of U.S. lakes and estuaries by providing a capability of detecting and quantifying algal blooms and related water quality using satellite data records.
Applications of agent-based modeling to nutrient movement Lake Michigan (PRESENTATION)
As part of an ongoing project aiming to provide useful information for nearshore management (harmful algal blooms, nutrient loading), we explore the value of agent-based models in Lake Michigan. Agent-based models follow many individual “agents” moving through a simul...
Spatial and Temporal Dynamics of Cyanobacterial Blooms in Two Rhode Island Ponds. (PRESENTATION)
Cyanobacteria are natural components of freshwater ecosystems. When conditions are favorable (e.g., high nutrient inputs), cyanobacteria can form dense blooms that have negative effects on human and animal health, ecosystem functioning, and aesthetics. When blooms occur they can ...
Harmful Algal Blooms (HABs): Responding to State and Regional Needs (PRESENTATION)
Presentation to Region 5 and States' visitors, 2/2/18.
Spatial and Temporal Dynamics of Cyanobacterial Blooms in Two Rhode Island Ponds (PRESENTATION)
Cyanobacteria are natural components of freshwater ecosystems. When conditions are favorable (e.g., high nutrient inputs), cyanobacteria can form dense blooms that have negative effects on human and animal health, ecosystem functioning, and aesthetics. When blooms occur they ca...
StreamCat and LakeCat: An overview of algorithms, data, and models developed at the US EPA Western Ecology Division to facilitate and advance watershed prediction in the conterminous US. (PRESENTATION)
Geospatial data and techniques have long been critical to advancing the analysis and management of freshwater ecosystems. However, these data and techniques have often been limited to specific sample sites or regional analyses because of the difficulty associated with generating ...
Harmful Algae Bloom Occurrence in Urban Ponds: Relationship of Toxin Levels with Cell Density and Species Composition (JOURNAL)
Retention ponds constructed within urban watershed areas of high density populations are common as a result of green infrastructure applications. Several urban ponds in the Northern Kentucky area were monitored for algal community (algae and cyanobacteria) from October 2012 to Se...
Novel Analyses of Long-Term Data Provide a Scientific Basis for Chlorophyll-a Thresholds in San Francisco Bay (JOURNAL)
San Francisco Bay (SFB), USA, is highly enriched in nitrogen and phosphorus, but has been resistant to the classic symptoms of eutrophication associated with over-production of phytoplankton. Observations in recent years suggest that this resistance may be weakening, shown by: si...
Using High Frequency Monitoring of Environmental Factors to Predict Microcystin Concentrations in a Multi-use, Inland Reservoir (PRESENTATION)
Cyanobacteria, known as blue-green algae, are photosynthetic bacteria found naturally in marine, freshwater, and estuarine ecosystems. An increase in nutrient input and changes in the climate have contributed to the proliferation of cyanobacteria, forming harmful algal blooms, or...
Overview of U.S. EPA Office of Research and Development’s planned research on analysis and monitoring in fresh and coastal/estuarine environments (PRESENTATION)
This research plan has several objectives: 1) develop new or refine existing chemical, instrument and biological methods for the detection of cyanobacteria and their toxins; test such methods in field studies in both HAB and non HAB environments; 2) determine the method(s) that c...
CyAN satellite-derived Cyanobacteria products in support of Public Health Protection (PRESENTATION)
The timely distribution of satellite-derived cyanoHAB data is necessary for adaptive water quality management decision-making and for targeted deployment of existing government and non-government water quality monitoring resources. The Cyanobacteria Assessment Network (CyAN) is a...
Human health effects and remotely sensed cyanobacteria (PRESENTATION)
Cyanobacteria blooms (HAB) pose a potential health risk to beachgoers, including HAB-associated gastrointestinal, respiratory and dermal illness. We conducted a prospective study of beachgoers at a Great Lakes beach during July – September, 2003. We recorded each participan...
Conventional Treatment Options for HABs Impacted Waters (PRESENTATION)
This presentation discusses (1) the removal of cyanobacterial cells through coagulation, flocculation, sedimentation and filtration, (2) the control of cyanobacterial toxins by powdered activated carbon, (3) the control of cyanobacterial toxins by chlorine, UV, ozone, chlorine di...