Keith A Loftin, Ph.D.
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Satellite monitoring of cyanobacterial harmful algal bloom frequency in recreational waters and drinking water sources
A method for examining temporal changes in cyanobacterial harmful algal bloom spatial extent using satellite remote sensing
A critical review of the postulated role of the non-essential amino acid, β-N-methylamino-L-alanine, in neurodegenerative disease in humans
Cyanobacteria of the 2016 Lake Okeechobee and Okeechobee Waterway harmful algal bloom
Expanded target-chemical analysis reveals extensive mixed-organic-contaminant exposure in USA streams
Methods used to characterize the chemical composition and biological activity of environmental waters throughout the United States, 2012-14
Similarities and differences in occurrence and temporal fluctuations in glyphosate and atrazine in small Midwestern streams (USA) during the 2013 growing season
Water quality and bed sediment quality in the Albemarle Sound, North Carolina, 2012–14
Spatial variability of harmful algal blooms in Milford Lake, Kansas, July and August 2015
Estimating microcystin levels at recreational sites in western Lake Erie and Ohio
Cyanobacterial harmful algal blooms (cyanoHABs) and associated toxins, such as microcystin, are a major global water-quality issue. Water-resource managers need tools to quickly predict when and where toxin-producing cyanoHABs will occur. This could be done by using site-specific models that estimate the potential for elevated toxin concentrations that cause public health concerns. With this study
Cyanotoxins in inland lakes of the United States: Occurrence and potential recreational health risks in the EPA National Lakes Assessment 2007
Total cylindrospermopsins, microcystins/nodularins, and saxitoxins data for the 2007 United States Environmental Protection Agency National Lake Assessment
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Satellite monitoring of cyanobacterial harmful algal bloom frequency in recreational waters and drinking water sources
Cyanobacterial harmful algal blooms (cyanoHAB) cause extensive problems in lakes worldwide, including human and ecological health risks, anoxia and fish kills, and taste and odor problems. CyanoHABs are a particular concern in both recreational waters and drinking water sources because of their dense biomass and the risk of exposure to toxins. Successful cyanoHAB assessment using satellites may prAuthorsJohn M. Clark, Blake A. Schaeffer, John A. Darling, Erin A. Urquhart, John M. Johnston, Amber R. Ignatius, Mark H. Myer, Keith A. Loftin, P. Jeremy Werdell, Richard P. StumpfA method for examining temporal changes in cyanobacterial harmful algal bloom spatial extent using satellite remote sensing
Cyanobacterial harmful algal blooms (CyanoHAB) are thought to be increasing globally over the past few decades, but relatively little quantitative information is available about the spatial extent of blooms. Satellite remote sensing provides a potential technology for identifying cyanoHABs in multiple water bodies and across geo-political boundaries. An assessment method was developed using MEdiumAuthorsErin A. Urquhart, Blake A. Schaeffer, Richard P. Stumpf, Keith A. Loftin, P. Jeremy WerdellA critical review of the postulated role of the non-essential amino acid, β-N-methylamino-L-alanine, in neurodegenerative disease in humans
The compound BMAA (β-N-methylamino-L-alanine) has been postulated to play a significant role in four serious neurological human diseases: Amyotrophic Lateral Sclerosis/Parkinsonism Dementia Complex (ALS/PDC) found on Guam, and ALS, Parkinsonism, and dementia that occur globally. ALS/PDC with symptoms of all three diseases first came to the attention of the scientific community during and after WorAuthorsNeil Chernoff, D. J. Hill, D. L. Diggs, B. D. Faison, B. M. Francis, J. R. Lang, M. M. Larue, T.-T. Le, Keith A. Loftin, J. N. Lugo, J. E. Schmid, W. W. WinnikCyanobacteria of the 2016 Lake Okeechobee and Okeechobee Waterway harmful algal bloom
The Lake Okeechobee and the Okeechobee Waterway (Lake Okeechobee, the St. Lucie Canal and River, and the Caloosahatchee River) experienced an extensive harmful algal bloom within Lake Okeechobee, the St. Lucie Canal and River and the Caloosahatchee River in 2016. In addition to the very visible bloom of the cyanobacterium Microcystis aeruginosa, several other cyanobacteria were present. These otheAuthorsBarry H. Rosen, Timothy W. Davis, Christopher J. Gobler, Benjamin J. Kramer, Keith A. LoftinExpanded target-chemical analysis reveals extensive mixed-organic-contaminant exposure in USA streams
Surface water from 38 streams nationwide was assessed using 14 target-organic methods (719 compounds). Designed-bioactive anthropogenic contaminants (biocides, pharmaceuticals) comprised 57% of 406 organics detected at least once. The 10 most-frequently detected anthropogenic-organics included eight pesticides (desulfinylfipronil, AMPA, chlorpyrifos, dieldrin, metolachlor, atrazine, CIAT, glyphosaAuthorsPaul M. Bradley, Celeste A. Journey, Kristin M. Romanok, Larry B. Barber, Herbert T. Buxton, William T. Foreman, Edward T. Furlong, Susan T. Glassmeyer, Michelle L. Hladik, Luke R. Iwanowicz, Daniel Jones, Dana W. Kolpin, Kathryn M. Kuivila, Keith A. Loftin, Marc A. Mills, Michael T. Meyer, James L. Orlando, Timothy J. Reilly, Kelly L. Smalling, Daniel L. VilleneuveMethods used to characterize the chemical composition and biological activity of environmental waters throughout the United States, 2012-14
A vast array of chemical compounds are in wide commercial use in the United States, and the potential ecological and human-health effect of exposure to chemical mixtures has been identified as a high priority in environment health science. Awareness of the potential effects of low-level chemical exposures is rising. The U.S. Geological Survey, in cooperation with the U.S. Environmental ProtectionAuthorsKristin M. Romanok, Timothy J. Reilly, Larry B. Barber, J. Scott Boone, Herbert T. Buxton, William T. Foreman, Edward T. Furlong, Michelle Hladik, Luke R. Iwanowicz, Celeste A. Journey, Dana W. Kolpin, Kathryn Kuivila, Keith A. Loftin, Marc A. Mills, Michael T. Meyer, James L. Orlando, Kelly L. Smalling, Daniel L. Villeneuve, Paul M. BradleySimilarities and differences in occurrence and temporal fluctuations in glyphosate and atrazine in small Midwestern streams (USA) during the 2013 growing season
Glyphosate and atrazine are the most intensively used herbicides in the United States. Although there is abundant spatial and temporal information on atrazine occurrence at regional scales, there are far fewer data for glyphosate, and studies that compare the two herbicides are rare. We investigated temporal patterns in glyphosate and atrazine concentrations measured weekly during the 2013 growingAuthorsBarbara Mahler, Peter C. Van Metre, Thomas E. Burley, Keith A. Loftin, Michael T. Meyer, Lisa H. NowellWater quality and bed sediment quality in the Albemarle Sound, North Carolina, 2012–14
The Albemarle Sound region was selected in 2012 as one of two demonstration sites in the Nation to test and improve the design of the National Water Quality Monitoring Council’s National Monitoring Network (NMN) for U.S. Coastal Waters and Tributaries. The goal of the NMN for U.S. Coastal Waters and Tributaries is to provide information about the health of our oceans, coastal ecosystems, and inlanAuthorsMichelle C. Moorman, Sharon A. Fitzgerald, Laura N. Gurley, Ahmed Rhoni-Aref, Keith A. LoftinSpatial variability of harmful algal blooms in Milford Lake, Kansas, July and August 2015
Cyanobacterial harmful algal blooms (CyanoHABs) tend to be spatially variable vertically in the water column and horizontally across the lake surface because of in-lake and weather-driven processes and can vary by orders of magnitude in concentration across relatively short distances (meters or less). Extreme spatial variability in cyanobacteria and associated compounds poses unique challenges toAuthorsGuy M. Foster, Jennifer L. Graham, Tom C. Stiles, Marvin G. Boyer, Lindsey R. King, Keith A. LoftinEstimating microcystin levels at recreational sites in western Lake Erie and Ohio
Cyanobacterial harmful algal blooms (cyanoHABs) and associated toxins, such as microcystin, are a major global water-quality issue. Water-resource managers need tools to quickly predict when and where toxin-producing cyanoHABs will occur. This could be done by using site-specific models that estimate the potential for elevated toxin concentrations that cause public health concerns. With this study
AuthorsDonna S. Francy, Amie M.G. Brady, Christopher D. Ecker, Jennifer L. Graham, Erin A. Stelzer, Pamela Struffolino, Keith A. LoftinCyanotoxins in inland lakes of the United States: Occurrence and potential recreational health risks in the EPA National Lakes Assessment 2007
A large nation-wide survey of cyanotoxins (1161 lakes) in the United States (U.S.) was conducted during the EPA National Lakes Assessment 2007. Cyanotoxin data were compared with cyanobacteria abundance- and chlorophyll-based World Health Organization (WHO) thresholds and mouse toxicity data to evaluate potential recreational risks. Cylindrospermopsins, microcystins, and saxitoxins were detected (AuthorsKeith A. Loftin, Jennifer L. Graham, Elizabeth Hilborn, Sarah Lehmann, Michael T. Meyer, Julie E. Dietze, Christopher GriffithTotal cylindrospermopsins, microcystins/nodularins, and saxitoxins data for the 2007 United States Environmental Protection Agency National Lake Assessment
Phytoplankton communities in freshwater lakes, ponds, and reservoirs may be dominated by cyanobacteria (also called blue-green algae) under certain environmental conditions. Cyanobacteria may cause a range of water-quality impairments, including the potential for toxin production. Cyanobacteria toxins (cyanotoxins) may adversely impact human and ecological health. Microcystins are considered to beAuthorsKeith A. Loftin, Julie E. Dietze, Michael T. Meyer, Jennifer L. Graham, Megan M. Maksimowicz, Kathryn D. Toyne - Software
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