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Keith A Loftin, Ph.D.

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Science and Products

Filter Total Items: 32
Nutrient inputs for HABs and algal toxins

Tracking Toxins at the Coastline: A National Look at Harmful Algal Toxins in U.S. Coastal Waters

This study is a major step forward in understanding how harmful algal blooms, which are often associated with lakes and rivers, can also affect coastal environments. It provides important baseline information for scientists, public health officials, and environmental managers.
By
Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, Central Plains Water Science Center
Tracking Toxins at the Coastline: A National Look at Harmful Algal Toxins in U.S. Coastal Waters

Tracking Toxins at the Coastline: A National Look at Harmful Algal Toxins in U.S. Coastal Waters

This study is a major step forward in understanding how harmful algal blooms, which are often associated with lakes and rivers, can also affect coastal environments. It provides important baseline information for scientists, public health officials, and environmental managers.
Learn More
A floating algal mat forming along the edge of the riverbank of the Shenandoah River.

Leveraging UV Light for Effective Algal Toxin Removal in Drinking Water

Harmful algal blooms (HABs) pose significant risks to public health and the environment by producing dangerous toxins like microcystin-LR (MC-LR), which can exceed safety limits in drinking water. Research by the U.S. Geological Survey, The Ohio State University, and Boise State University evaluated ultraviolet (UV) light treatments for reducing microcystin levels, comparing traditional UV254 with...
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
Leveraging UV Light for Effective Algal Toxin Removal in Drinking Water

Leveraging UV Light for Effective Algal Toxin Removal in Drinking Water

Harmful algal blooms (HABs) pose significant risks to public health and the environment by producing dangerous toxins like microcystin-LR (MC-LR), which can exceed safety limits in drinking water. Research by the U.S. Geological Survey, The Ohio State University, and Boise State University evaluated ultraviolet (UV) light treatments for reducing microcystin levels, comparing traditional UV254 with...
Learn More
Image: Harmful Algal Blooms

Algal and Environmental Toxins Research Laboratory — Lawrence, Kansas

About the Laboratory The Environmental Health Program collaborates with scientists at the Organic Geochemistry Research Laboratory (OGRL) in Lawrence, Kansas, to develop and employ targeted and non-targeted analytical methods for identification and quantitation of known and understudied algal/cyanobacterial toxins. The laboratory contructed in 2019 is a 2,500 square foot modern laboratory facility...
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
Algal and Environmental Toxins Research Laboratory — Lawrence, Kansas

Algal and Environmental Toxins Research Laboratory — Lawrence, Kansas

About the Laboratory The Environmental Health Program collaborates with scientists at the Organic Geochemistry Research Laboratory (OGRL) in Lawrence, Kansas, to develop and employ targeted and non-targeted analytical methods for identification and quantitation of known and understudied algal/cyanobacterial toxins. The laboratory contructed in 2019 is a 2,500 square foot modern laboratory facility...
Learn More
Microscope image of Microcystis sp.

Decoding Harmful Algal Blooms: Unraveling the Mystery

Harmful algal blooms (HABs) are a significant environmental concern due to their potential effects on health, ecosystems, and economies. Algal toxins, which are toxic compounds produced by certain species of cyanobacteria and algae, are commonly linked to these blooms. It's important to note that algal toxins can still be present even when a bloom is not visible, highlighting the need for ongoing...
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, California Water Science Center, Caribbean-Florida Water Science Center (CFWSC), Maryland-Delaware-D.C. Water Science Center, National Wildlife Health Center, Nevada Water Science Center, New England Water Science Center, New Jersey Water Science Center, New Mexico Water Science Center, South Atlantic Water Science Center (SAWSC), St. Petersburg Coastal and Marine Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center
Decoding Harmful Algal Blooms: Unraveling the Mystery

Decoding Harmful Algal Blooms: Unraveling the Mystery

Harmful algal blooms (HABs) are a significant environmental concern due to their potential effects on health, ecosystems, and economies. Algal toxins, which are toxic compounds produced by certain species of cyanobacteria and algae, are commonly linked to these blooms. It's important to note that algal toxins can still be present even when a bloom is not visible, highlighting the need for ongoing...
Learn More
see caption

Understanding Algal Bloom Dynamics in Lake Okeechobee

The U.S. Geological Survey (USGS) is conducting studies to better understand algal bloom dynamics to enhance lake management. Recent research, in Lake Okeechobee, Florida, focused on phytoplankton community and abundance. Phytoplankton can be a potential driver of harmful algal blooms (HABs).
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, Caribbean-Florida Water Science Center (CFWSC)
Understanding Algal Bloom Dynamics in Lake Okeechobee

Understanding Algal Bloom Dynamics in Lake Okeechobee

The U.S. Geological Survey (USGS) is conducting studies to better understand algal bloom dynamics to enhance lake management. Recent research, in Lake Okeechobee, Florida, focused on phytoplankton community and abundance. Phytoplankton can be a potential driver of harmful algal blooms (HABs).
Learn More
Image shows laboratory instrumentation

FY25 Capabilities and Services

The U.S. Geological Survey (USGS) Kansas Water Science Center Organic Geochemistry Research Laboratory (OGRL) was established in 1987. The OGRL is a multidisciplinary program that contributes knowledge about the distribution, fate, transport, and effects of new and understudied organic compounds that may affect human health and (or) ecosystems. The OGRL consists of two units: Algal and Other...
By
Central Plains Water Science Center, Organic Geochemistry Research Laboratory (OGRL)
FY25 Capabilities and Services

FY25 Capabilities and Services

The U.S. Geological Survey (USGS) Kansas Water Science Center Organic Geochemistry Research Laboratory (OGRL) was established in 1987. The OGRL is a multidisciplinary program that contributes knowledge about the distribution, fate, transport, and effects of new and understudied organic compounds that may affect human health and (or) ecosystems. The OGRL consists of two units: Algal and Other...
Learn More
Filter Total Items: 28

Fourier Transform Infrared (FTIR) screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015 Fourier Transform Infrared (FTIR) screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015

Coastal communities are uniquely vulnerable to sea-level rise and severe storms such as hurricanes. These events enhance the dispersion and concentration of natural and anthropogenic chemicals and pathogenic microorganisms that could adversely affect the health and resilience of coastal communities and ecosystems in subsequent years. The U.S. Geological Survey has developed the Sediment...
By
Central Plains Water Science Center

Protein Phosphatase 2A screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015 Protein Phosphatase 2A screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015

Coastal communities are uniquely vulnerable to sea-level rise and severe storms such as hurricanes. These events enhance the dispersion and concentration of natural and anthropogenic chemicals and pathogenic microorganisms that could adversely affect the health and resilience of coastal communities and ecosystems in subsequent years. The U.S. Geological Survey has developed the Sediment...
By
Central Plains Water Science Center

2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Great Lakes Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS) 2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Great Lakes Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS)

The EPA National Coastal Condition Assessment (NCCA) is a nation-wide survey of coastal and estuarine water quality. During the 2015 EPA NCCA, samples were collected for analysis of algal toxins and cyanotoxins at the Organic Geochemistry Research Laboratory (OGRL) at the U.S. Geological Survey Kansas Water Science Center (KSWSC) by liquid chromatography triple quadrupole mass...
By
Central Plains Water Science Center

2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Estuary Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS) 2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Estuary Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS)

The U.S. Environmental Protection Agency (EPA) National Coastal Condition Assessment (NCCA) is a nationwide survey of coastal and estuarine water quality. During the 2015 EPA NCCA, samples were collected at 732 sites for analysis of algal toxins and cyanotoxins at the Organic Geochemistry Research Laboratory (OGRL) at the U.S. Geological Survey Kansas Water Science Center (KSWSC) by...
By
Central Plains Water Science Center

Phytoplankton Identification and Enumeration Data Collected from Seven Reservoirs in the United States (July to November 2019) Phytoplankton Identification and Enumeration Data Collected from Seven Reservoirs in the United States (July to November 2019)

This dataset contains algal identification and enumeration data for phytoplankton samples collected by the U.S. Geological Survey (USGS) between July 2019 and November 2019 at seven reservoirs across the United States. Reservoirs sampled included Lake Koshkonong, Wisconsin, Pelican Lake, Minnesota, Lake Ida, Minnesota, Pomme de Terre, Minnesota, Lake Emily, Minnesota, Milford Lake...
By
Central Plains Water Science Center

Phytoplankton data for samples collected at twelve large river sites throughout the United States, June through October 2019 Phytoplankton data for samples collected at twelve large river sites throughout the United States, June through October 2019

This U.S. Geological Survey (USGS) Data Release provides phytoplankton data for samples collected from twelve large river sites throughout the United States, from June through October 2019. All data are reported as raw calculated values and are not rounded to USGS significant figures. The dataset includes all routine and quality assurance/quality control samples collected as part of a...
By
New York Water Science Center
Picture showing satellite data for a lake
Satellite reflectance for Milford Lake near Wakefield, Kansas
Satellite reflectance for Milford Lake near Wakefield, Kansas
Picture showing satellite data for a lake

Satellite reflectance for Milford Lake near Wakefield, Kansas

Satellite reflectance for Milford Lake near Wakefield, Kansas

The image shows sattelite relectance data that can be accessed using

By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
Picture showing satellite data for a lake

Satellite reflectance for Milford Lake near Wakefield, Kansas

Satellite reflectance for Milford Lake near Wakefield, Kansas

The image shows sattelite relectance data that can be accessed using

By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples
(USGS scientist working on data analysis of cyanotoxins in water
(USGS scientist working on data analysis of cyanotoxins in water
U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

(USGS scientist working on data analysis of cyanotoxins in water

(USGS scientist working on data analysis of cyanotoxins in water

U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

(USGS scientist working on data analysis of cyanotoxins in water

(USGS scientist working on data analysis of cyanotoxins in water

U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer
USGS scientists evaluating the nebulizer assembly
USGS scientists evaluating the nebulizer assembly
USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer used to measure individual cyanotoxins

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer used to measure individual cyanotoxins

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA)
USGS scientist preparing to measure cyanotoxins in water samples
USGS scientist preparing to measure cyanotoxins in water samples
USGS scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA)

USGS scientist preparing to measure cyanotoxins in water samples

USGS scientist preparing to measure cyanotoxins in water samples

USGS) scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA) instrument

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA)

USGS scientist preparing to measure cyanotoxins in water samples

USGS scientist preparing to measure cyanotoxins in water samples

USGS) scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA) instrument

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
Filter Total Items: 87

Tapwater-contaminant mixtures and risk in a biofuel-facility impacted private-well community Tapwater-contaminant mixtures and risk in a biofuel-facility impacted private-well community

We assessed private-well drinking water (DW) at the point of use (i.e., tapwater, TW) within a rural Nebraska community around a state-closed biofuel facility, which used pesticide-treated corn seed as feedstock for ethanol production. Organic (485), inorganic (34), and microbial (13) analytes were assessed at 15 locations in June 2022, to evaluate the relative contribution of facility...
Authors
Paul M. Bradley, Shannon M. Meppelink, Kristin Romanok, Molly L. Schreiner, Kelly Smalling, Shannon L. Bartelt-Hunt, Brenda Densmore, Stephanie E. Gordon, Keith Loftin, R. Blaine McCleskey, Eleanor G. Rogan, David L. Rus, Daniel D. Snow
By
South Atlantic Water Science Center (SAWSC)

Cyanotoxin and domoic acid occurrence, relation with salinity, and potential recreational health risks in U.S. coasts in the 2015 US EPA National Coastal Condition Assessment Cyanotoxin and domoic acid occurrence, relation with salinity, and potential recreational health risks in U.S. coasts in the 2015 US EPA National Coastal Condition Assessment

In the first nationwide study of cyanotoxins in U.S. estuaries, algal toxins, cyanotoxins, chlorophyll, and salinity were measured in samples collected during the National Coastal Condition Assessment 2015. Anatoxin-a (ANAA), cylindrospermopsin (CYLS), domoic acid (DMAC), and microcystins (MCs) were detected by LC/MS/MS in 0.6, 0.9, 8.3, and 2.0 % of samples with mean concentrations of...
Authors
Ariel R. Donovan, Zachary R. Laughrey, Robin A. Femmer, Sarena L. Senegal, Keith A. Loftin

Comparison of Microcystin-LR degradation by UV222 and UV254 Comparison of Microcystin-LR degradation by UV222 and UV254

Microcystin-LR (MC-LR), a toxin produced during some cyanobacterial harmful algal blooms (cyanoHABs), can harm ecosystems and require consideration in water treatment. Ultraviolet (UV)-C treatment has the potential to degrade cyanotoxins with less harmful byproducts than other treatments. This study compares MC-LR degradation in three different water types using UV-C light emitted from a...
Authors
Zanna J. Leciejewski, Zachary R. Laughrey, Amanda L. Stickney, Keith A. Loftin, Natalie M. Hull

Tapwater exposures, residential risk, and mitigation in a PFAS-impacted-groundwater community Tapwater exposures, residential risk, and mitigation in a PFAS-impacted-groundwater community

Tapwater (TW) safety and sustainability are priorities in the United States. Per/polyfluoroalkyl substance(s) (PFAS) contamination is a growing public-health concern due to prolific use, widespread TW exposures, and mounting human-health concerns. Historically-rural, actively-urbanizing communities that rely on surficial-aquifer private wells incur elevated risks of unrecognized TW...
Authors
Paul M. Bradley, Kristin M. Romanok, Kelly Smalling, Lee Donahue, Mark P. Gaikowski, Randy K. Hines, Sara E. Breitmeyer, Stephanie E. Gordon, Keith A. Loftin, R. Blaine McCleskey, Shannon M. Meppelink, Molly L. Schreiner
By
Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC)

Genome sequences of toxigenic cyanobacteria from a bloom in Lake Mattamuskeet, North Carolina (United States) Genome sequences of toxigenic cyanobacteria from a bloom in Lake Mattamuskeet, North Carolina (United States)

Lake Mattamuskeet, the largest lake in North Carolina, USA, has undergone decades-long eutrophication causing reduced water quality and promoting cyanobacterial blooms that may produce toxins. It is therefore necessary to evaluate the cyanobacterial diversity of the lake and their toxigenic potential. We present draft genomes of Microcystis, Pelatocladus, Raphidiopsis, and Umezakia...
Authors
Jéssica A. Moretto, David E. Berthold, Forrest W. Lefler, Viviana Mazzei, Keith A. Loftin, Dail H. Laughinghouse
By
Water Resources Mission Area, Central Plains Water Science Center, Caribbean-Florida Water Science Center (CFWSC)

Phytoplankton assemblage structure, drivers, and thresholds with a focus on harmful algal bloom ecology in the Lake Okeechobee system, Florida, USA Phytoplankton assemblage structure, drivers, and thresholds with a focus on harmful algal bloom ecology in the Lake Okeechobee system, Florida, USA

Untangling the complexities of harmful algal bloom (HAB) dynamics is an ongoing effort that requires a fundamental understanding of spatiotemporal phytoplankton patterns and the environmental filters through which assemblages are structured. To this aim, monthly field surveys were conducted from 2019 to 2021 at 21 sites in Lake Okeechobee, Florida – a large, shallow, eutrophic, and...
Authors
Viviana Mazzei, Kristy Lee Sullivan, Keith A. Loftin
By
Water Resources Mission Area, Central Plains Water Science Center, Caribbean-Florida Water Science Center (CFWSC)

CyAN Field Integrated Exploratory Lakes Database (CyAN FIELD) CyAN Field Integrated Exploratory Lakes Database (CyAN FIELD)

The Cyanobacteria Assessment Network (CyAN) is a multi-agency project to develop remote sensing technology using satellite data to provide early warnings for cyanobacteria and algal blooms in U.S. lakes and reservoirs. To support remote sensing efforts by CyAN, validating satellite imagery is critical to developing early warning indicators for cyanobacteria and algae blooms. This open...
By
Central Plains Water Science Center
Satellite Imagery Can Track Harmful Algal Blooms

Satellite Imagery Can Track Harmful Algal Blooms

A joint collaboration between EPA, NOAA, NASA, and USGS scientists has demonstrated that satellite imagery can be used to track the frequency of...

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New Science Challenges Old Assumptions about Harmful Algal Blooms

New Science Challenges Old Assumptions about Harmful Algal Blooms

First-of-its-kind survey shows that algal toxins are found nationwide

Read Article
Multiple Satellite Eyes to Track Algal Threat to U.S. Freshwater

Multiple Satellite Eyes to Track Algal Threat to U.S. Freshwater

Four federal agencies including the U.S. Geological Survey have joined forces in an effort to transform satellite data into vital information to...

Read Article

Science and Products

Filter Total Items: 32
Nutrient inputs for HABs and algal toxins

Tracking Toxins at the Coastline: A National Look at Harmful Algal Toxins in U.S. Coastal Waters

This study is a major step forward in understanding how harmful algal blooms, which are often associated with lakes and rivers, can also affect coastal environments. It provides important baseline information for scientists, public health officials, and environmental managers.
By
Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, Central Plains Water Science Center
Tracking Toxins at the Coastline: A National Look at Harmful Algal Toxins in U.S. Coastal Waters

Tracking Toxins at the Coastline: A National Look at Harmful Algal Toxins in U.S. Coastal Waters

This study is a major step forward in understanding how harmful algal blooms, which are often associated with lakes and rivers, can also affect coastal environments. It provides important baseline information for scientists, public health officials, and environmental managers.
Learn More
A floating algal mat forming along the edge of the riverbank of the Shenandoah River.

Leveraging UV Light for Effective Algal Toxin Removal in Drinking Water

Harmful algal blooms (HABs) pose significant risks to public health and the environment by producing dangerous toxins like microcystin-LR (MC-LR), which can exceed safety limits in drinking water. Research by the U.S. Geological Survey, The Ohio State University, and Boise State University evaluated ultraviolet (UV) light treatments for reducing microcystin levels, comparing traditional UV254 with...
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
Leveraging UV Light for Effective Algal Toxin Removal in Drinking Water

Leveraging UV Light for Effective Algal Toxin Removal in Drinking Water

Harmful algal blooms (HABs) pose significant risks to public health and the environment by producing dangerous toxins like microcystin-LR (MC-LR), which can exceed safety limits in drinking water. Research by the U.S. Geological Survey, The Ohio State University, and Boise State University evaluated ultraviolet (UV) light treatments for reducing microcystin levels, comparing traditional UV254 with...
Learn More
Image: Harmful Algal Blooms

Algal and Environmental Toxins Research Laboratory — Lawrence, Kansas

About the Laboratory The Environmental Health Program collaborates with scientists at the Organic Geochemistry Research Laboratory (OGRL) in Lawrence, Kansas, to develop and employ targeted and non-targeted analytical methods for identification and quantitation of known and understudied algal/cyanobacterial toxins. The laboratory contructed in 2019 is a 2,500 square foot modern laboratory facility...
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
Algal and Environmental Toxins Research Laboratory — Lawrence, Kansas

Algal and Environmental Toxins Research Laboratory — Lawrence, Kansas

About the Laboratory The Environmental Health Program collaborates with scientists at the Organic Geochemistry Research Laboratory (OGRL) in Lawrence, Kansas, to develop and employ targeted and non-targeted analytical methods for identification and quantitation of known and understudied algal/cyanobacterial toxins. The laboratory contructed in 2019 is a 2,500 square foot modern laboratory facility...
Learn More
Microscope image of Microcystis sp.

Decoding Harmful Algal Blooms: Unraveling the Mystery

Harmful algal blooms (HABs) are a significant environmental concern due to their potential effects on health, ecosystems, and economies. Algal toxins, which are toxic compounds produced by certain species of cyanobacteria and algae, are commonly linked to these blooms. It's important to note that algal toxins can still be present even when a bloom is not visible, highlighting the need for ongoing...
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, California Water Science Center, Caribbean-Florida Water Science Center (CFWSC), Maryland-Delaware-D.C. Water Science Center, National Wildlife Health Center, Nevada Water Science Center, New England Water Science Center, New Jersey Water Science Center, New Mexico Water Science Center, South Atlantic Water Science Center (SAWSC), St. Petersburg Coastal and Marine Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center
Decoding Harmful Algal Blooms: Unraveling the Mystery

Decoding Harmful Algal Blooms: Unraveling the Mystery

Harmful algal blooms (HABs) are a significant environmental concern due to their potential effects on health, ecosystems, and economies. Algal toxins, which are toxic compounds produced by certain species of cyanobacteria and algae, are commonly linked to these blooms. It's important to note that algal toxins can still be present even when a bloom is not visible, highlighting the need for ongoing...
Learn More
see caption

Understanding Algal Bloom Dynamics in Lake Okeechobee

The U.S. Geological Survey (USGS) is conducting studies to better understand algal bloom dynamics to enhance lake management. Recent research, in Lake Okeechobee, Florida, focused on phytoplankton community and abundance. Phytoplankton can be a potential driver of harmful algal blooms (HABs).
By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, Caribbean-Florida Water Science Center (CFWSC)
Understanding Algal Bloom Dynamics in Lake Okeechobee

Understanding Algal Bloom Dynamics in Lake Okeechobee

The U.S. Geological Survey (USGS) is conducting studies to better understand algal bloom dynamics to enhance lake management. Recent research, in Lake Okeechobee, Florida, focused on phytoplankton community and abundance. Phytoplankton can be a potential driver of harmful algal blooms (HABs).
Learn More
Image shows laboratory instrumentation

FY25 Capabilities and Services

The U.S. Geological Survey (USGS) Kansas Water Science Center Organic Geochemistry Research Laboratory (OGRL) was established in 1987. The OGRL is a multidisciplinary program that contributes knowledge about the distribution, fate, transport, and effects of new and understudied organic compounds that may affect human health and (or) ecosystems. The OGRL consists of two units: Algal and Other...
By
Central Plains Water Science Center, Organic Geochemistry Research Laboratory (OGRL)
FY25 Capabilities and Services

FY25 Capabilities and Services

The U.S. Geological Survey (USGS) Kansas Water Science Center Organic Geochemistry Research Laboratory (OGRL) was established in 1987. The OGRL is a multidisciplinary program that contributes knowledge about the distribution, fate, transport, and effects of new and understudied organic compounds that may affect human health and (or) ecosystems. The OGRL consists of two units: Algal and Other...
Learn More
Filter Total Items: 28

Fourier Transform Infrared (FTIR) screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015 Fourier Transform Infrared (FTIR) screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015

Coastal communities are uniquely vulnerable to sea-level rise and severe storms such as hurricanes. These events enhance the dispersion and concentration of natural and anthropogenic chemicals and pathogenic microorganisms that could adversely affect the health and resilience of coastal communities and ecosystems in subsequent years. The U.S. Geological Survey has developed the Sediment...
By
Central Plains Water Science Center

Protein Phosphatase 2A screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015 Protein Phosphatase 2A screening of extracted sediments for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015

Coastal communities are uniquely vulnerable to sea-level rise and severe storms such as hurricanes. These events enhance the dispersion and concentration of natural and anthropogenic chemicals and pathogenic microorganisms that could adversely affect the health and resilience of coastal communities and ecosystems in subsequent years. The U.S. Geological Survey has developed the Sediment...
By
Central Plains Water Science Center

2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Great Lakes Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS) 2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Great Lakes Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS)

The EPA National Coastal Condition Assessment (NCCA) is a nation-wide survey of coastal and estuarine water quality. During the 2015 EPA NCCA, samples were collected for analysis of algal toxins and cyanotoxins at the Organic Geochemistry Research Laboratory (OGRL) at the U.S. Geological Survey Kansas Water Science Center (KSWSC) by liquid chromatography triple quadrupole mass...
By
Central Plains Water Science Center

2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Estuary Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS) 2015 National Coastal Conditions Assessment: Algal Toxins and Cyanotoxins in United States Estuary Samples Detected by Liquid Chromatography Triple Quadrupole Mass Spectrometry (LC/MS/MS)

The U.S. Environmental Protection Agency (EPA) National Coastal Condition Assessment (NCCA) is a nationwide survey of coastal and estuarine water quality. During the 2015 EPA NCCA, samples were collected at 732 sites for analysis of algal toxins and cyanotoxins at the Organic Geochemistry Research Laboratory (OGRL) at the U.S. Geological Survey Kansas Water Science Center (KSWSC) by...
By
Central Plains Water Science Center

Phytoplankton Identification and Enumeration Data Collected from Seven Reservoirs in the United States (July to November 2019) Phytoplankton Identification and Enumeration Data Collected from Seven Reservoirs in the United States (July to November 2019)

This dataset contains algal identification and enumeration data for phytoplankton samples collected by the U.S. Geological Survey (USGS) between July 2019 and November 2019 at seven reservoirs across the United States. Reservoirs sampled included Lake Koshkonong, Wisconsin, Pelican Lake, Minnesota, Lake Ida, Minnesota, Pomme de Terre, Minnesota, Lake Emily, Minnesota, Milford Lake...
By
Central Plains Water Science Center

Phytoplankton data for samples collected at twelve large river sites throughout the United States, June through October 2019 Phytoplankton data for samples collected at twelve large river sites throughout the United States, June through October 2019

This U.S. Geological Survey (USGS) Data Release provides phytoplankton data for samples collected from twelve large river sites throughout the United States, from June through October 2019. All data are reported as raw calculated values and are not rounded to USGS significant figures. The dataset includes all routine and quality assurance/quality control samples collected as part of a...
By
New York Water Science Center
Picture showing satellite data for a lake
Satellite reflectance for Milford Lake near Wakefield, Kansas
Satellite reflectance for Milford Lake near Wakefield, Kansas
Picture showing satellite data for a lake

Satellite reflectance for Milford Lake near Wakefield, Kansas

Satellite reflectance for Milford Lake near Wakefield, Kansas

The image shows sattelite relectance data that can be accessed using

By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
Picture showing satellite data for a lake

Satellite reflectance for Milford Lake near Wakefield, Kansas

Satellite reflectance for Milford Lake near Wakefield, Kansas

The image shows sattelite relectance data that can be accessed using

By
Ecosystems Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology
U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples
(USGS scientist working on data analysis of cyanotoxins in water
(USGS scientist working on data analysis of cyanotoxins in water
U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

(USGS scientist working on data analysis of cyanotoxins in water

(USGS scientist working on data analysis of cyanotoxins in water

U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

(USGS scientist working on data analysis of cyanotoxins in water

(USGS scientist working on data analysis of cyanotoxins in water

U.S. Geological Survey (USGS) scientist working on data analysis of cyanotoxins in water samples

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Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer
USGS scientists evaluating the nebulizer assembly
USGS scientists evaluating the nebulizer assembly
USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer used to measure individual cyanotoxins

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Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly

USGS scientists evaluating the nebulizer assembly in a mixed mode ionization source of a triple quadrupole mass spectrometer used to measure individual cyanotoxins

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Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA)
USGS scientist preparing to measure cyanotoxins in water samples
USGS scientist preparing to measure cyanotoxins in water samples
USGS scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA)

USGS scientist preparing to measure cyanotoxins in water samples

USGS scientist preparing to measure cyanotoxins in water samples

USGS) scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA) instrument

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Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA)

USGS scientist preparing to measure cyanotoxins in water samples

USGS scientist preparing to measure cyanotoxins in water samples

USGS) scientist preparing to measure cyanotoxins in water samples using an automated enzyme-linked immunosorbent assay (ELISA) instrument

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
Filter Total Items: 87

Tapwater-contaminant mixtures and risk in a biofuel-facility impacted private-well community Tapwater-contaminant mixtures and risk in a biofuel-facility impacted private-well community

We assessed private-well drinking water (DW) at the point of use (i.e., tapwater, TW) within a rural Nebraska community around a state-closed biofuel facility, which used pesticide-treated corn seed as feedstock for ethanol production. Organic (485), inorganic (34), and microbial (13) analytes were assessed at 15 locations in June 2022, to evaluate the relative contribution of facility...
Authors
Paul M. Bradley, Shannon M. Meppelink, Kristin Romanok, Molly L. Schreiner, Kelly Smalling, Shannon L. Bartelt-Hunt, Brenda Densmore, Stephanie E. Gordon, Keith Loftin, R. Blaine McCleskey, Eleanor G. Rogan, David L. Rus, Daniel D. Snow
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South Atlantic Water Science Center (SAWSC)

Cyanotoxin and domoic acid occurrence, relation with salinity, and potential recreational health risks in U.S. coasts in the 2015 US EPA National Coastal Condition Assessment Cyanotoxin and domoic acid occurrence, relation with salinity, and potential recreational health risks in U.S. coasts in the 2015 US EPA National Coastal Condition Assessment

In the first nationwide study of cyanotoxins in U.S. estuaries, algal toxins, cyanotoxins, chlorophyll, and salinity were measured in samples collected during the National Coastal Condition Assessment 2015. Anatoxin-a (ANAA), cylindrospermopsin (CYLS), domoic acid (DMAC), and microcystins (MCs) were detected by LC/MS/MS in 0.6, 0.9, 8.3, and 2.0 % of samples with mean concentrations of...
Authors
Ariel R. Donovan, Zachary R. Laughrey, Robin A. Femmer, Sarena L. Senegal, Keith A. Loftin

Comparison of Microcystin-LR degradation by UV222 and UV254 Comparison of Microcystin-LR degradation by UV222 and UV254

Microcystin-LR (MC-LR), a toxin produced during some cyanobacterial harmful algal blooms (cyanoHABs), can harm ecosystems and require consideration in water treatment. Ultraviolet (UV)-C treatment has the potential to degrade cyanotoxins with less harmful byproducts than other treatments. This study compares MC-LR degradation in three different water types using UV-C light emitted from a...
Authors
Zanna J. Leciejewski, Zachary R. Laughrey, Amanda L. Stickney, Keith A. Loftin, Natalie M. Hull

Tapwater exposures, residential risk, and mitigation in a PFAS-impacted-groundwater community Tapwater exposures, residential risk, and mitigation in a PFAS-impacted-groundwater community

Tapwater (TW) safety and sustainability are priorities in the United States. Per/polyfluoroalkyl substance(s) (PFAS) contamination is a growing public-health concern due to prolific use, widespread TW exposures, and mounting human-health concerns. Historically-rural, actively-urbanizing communities that rely on surficial-aquifer private wells incur elevated risks of unrecognized TW...
Authors
Paul M. Bradley, Kristin M. Romanok, Kelly Smalling, Lee Donahue, Mark P. Gaikowski, Randy K. Hines, Sara E. Breitmeyer, Stephanie E. Gordon, Keith A. Loftin, R. Blaine McCleskey, Shannon M. Meppelink, Molly L. Schreiner
By
Pennsylvania Water Science Center, South Atlantic Water Science Center (SAWSC)

Genome sequences of toxigenic cyanobacteria from a bloom in Lake Mattamuskeet, North Carolina (United States) Genome sequences of toxigenic cyanobacteria from a bloom in Lake Mattamuskeet, North Carolina (United States)

Lake Mattamuskeet, the largest lake in North Carolina, USA, has undergone decades-long eutrophication causing reduced water quality and promoting cyanobacterial blooms that may produce toxins. It is therefore necessary to evaluate the cyanobacterial diversity of the lake and their toxigenic potential. We present draft genomes of Microcystis, Pelatocladus, Raphidiopsis, and Umezakia...
Authors
Jéssica A. Moretto, David E. Berthold, Forrest W. Lefler, Viviana Mazzei, Keith A. Loftin, Dail H. Laughinghouse
By
Water Resources Mission Area, Central Plains Water Science Center, Caribbean-Florida Water Science Center (CFWSC)

Phytoplankton assemblage structure, drivers, and thresholds with a focus on harmful algal bloom ecology in the Lake Okeechobee system, Florida, USA Phytoplankton assemblage structure, drivers, and thresholds with a focus on harmful algal bloom ecology in the Lake Okeechobee system, Florida, USA

Untangling the complexities of harmful algal bloom (HAB) dynamics is an ongoing effort that requires a fundamental understanding of spatiotemporal phytoplankton patterns and the environmental filters through which assemblages are structured. To this aim, monthly field surveys were conducted from 2019 to 2021 at 21 sites in Lake Okeechobee, Florida – a large, shallow, eutrophic, and...
Authors
Viviana Mazzei, Kristy Lee Sullivan, Keith A. Loftin
By
Water Resources Mission Area, Central Plains Water Science Center, Caribbean-Florida Water Science Center (CFWSC)

CyAN Field Integrated Exploratory Lakes Database (CyAN FIELD) CyAN Field Integrated Exploratory Lakes Database (CyAN FIELD)

The Cyanobacteria Assessment Network (CyAN) is a multi-agency project to develop remote sensing technology using satellite data to provide early warnings for cyanobacteria and algal blooms in U.S. lakes and reservoirs. To support remote sensing efforts by CyAN, validating satellite imagery is critical to developing early warning indicators for cyanobacteria and algae blooms. This open...
By
Central Plains Water Science Center
Satellite Imagery Can Track Harmful Algal Blooms

Satellite Imagery Can Track Harmful Algal Blooms

A joint collaboration between EPA, NOAA, NASA, and USGS scientists has demonstrated that satellite imagery can be used to track the frequency of...

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New Science Challenges Old Assumptions about Harmful Algal Blooms

New Science Challenges Old Assumptions about Harmful Algal Blooms

First-of-its-kind survey shows that algal toxins are found nationwide

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Multiple Satellite Eyes to Track Algal Threat to U.S. Freshwater

Multiple Satellite Eyes to Track Algal Threat to U.S. Freshwater

Four federal agencies including the U.S. Geological Survey have joined forces in an effort to transform satellite data into vital information to...

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