A5011156971- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Soil and Water Nutrient Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Biocrusts and Microbial Ecology
- Fish Ecology and Management Studies
- Aquatic Ecosystems and Biodiversity
- Race, History, and American Society
- Water Quality and Resources Studies
- Microbial Community Ecology and Physiology
- Constructed Wetlands for Wastewater Treatment
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Algal biology and biofuel production
- Geographic Information Systems Studies
- Aquatic Invertebrate Ecology and Behavior
- American History and Culture
- Colonialism, slavery, and trade
- Pharmaceutical and Antibiotic Environmental Impacts
- Toxic Organic Pollutants Impact
- Environmental Monitoring and Data Management
- Soil Carbon and Nitrogen Dynamics
- Fire effects on ecosystems
- Water Quality and Pollution Assessment
- Recycling and Waste Management Techniques
University of Kansas
2015-2025
Kansas Department of Health and Environment
2017
United States Geological Survey
2014-2016
University of Idaho
2014
Abstract Freshwater cyanobacterial blooms have become ubiquitous, posing major threats to ecological and public health. Decades of research focused on understanding drivers these with a primary focus eutrophic systems; however, also occur in oligotrophic systems, but received far less attention, resulting gap our overall. In this review, we explore evidence freshwater systems provide explanations for those occurrences. We show that through their unique physiological adaptations,...
Abstract Cyanobacterial blooms have substantial direct and indirect negative impacts on freshwater ecosystems including releasing toxins, blocking light needed by other organisms, depleting oxygen. There is growing concern over the potential for climate change to promote cyanobacterial blooms, as positive effects of increasing lake surface temperature growth are well documented in literature; however, there evidence that also being initiated persisting relatively cold‐water temperatures...
Abstract High concentrations of cyanobacterial toxins such as microcystin represent a global challenge to water quality in lakes, threatening health, economies and ecosystem stability. Lakes are sentinels climate change but how warming will affect is still unclear. Here we examine impacts the probability exceeding thresholds across 2,804 lakes United States show future alter these probabilities. We find that higher temperatures consistently increase likelihood occurrence above highest for...
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...
Water quality of eutrophic lakes is threatened by harmful cyanobacterial blooms, which are favored summer heatwaves and expected to intensify with global warming. Societal demands on surface water for drinking, irrigation recreation also highest in summer, especially during dry warm conditions. Here, we analyzed trends online searches investigate how public awareness blooms impacted temperature nine different countries over almost twenty years. Our findings reveal large seasonal interannual...
Freshwater benthic algae form complex mat matrices that can confer ecosystem benefits but also produce harmful cyanotoxins and nuisance taste-and-odor (T&O) compounds. Despite intensive study of the response pelagic systems to anthropogenic change, environmental factors controlling toxin presence in mats remain uncertain. Here, we present a unique dataset from rapidly urbanizing community (Kansas City, USA) spans environmental, toxicological, taxonomic, genomic indicators identify prevalence...
The use of persistent organic pollutants (POPs), such as herbicides, pesticides, pharmaceutical and personal care products (PCPPs), polycyclic aromatic hydrocarbons (PAHs), has more than doubled since 1950. POPs find their way into aquatic ecosystems through agricultural industrial runoff, wastewater treatment effluent discharge, atmospheric deposition. Cyanobacterial harmful algal blooms (CyanoHABs), which can produce toxins potent enough to cause human death, have been increasing in...
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...
Wetlands play a disproportionate role in the global climate as major sources and sinks of greenhouse gases. Herbicides are most heavily used agrochemicals frequently detected aquatic ecosystems, with glyphosate 2,4-Dichlorophenoxyacetic acid (2,4-D), representing two commonly worldwide. In recent years, these herbicides being mixtures to combat herbicide-tolerant noxious weeds. While it is well documented that herbicide use for agriculture expected increase, their indirect effects on wetland...
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...
The bbe-Moldaenke BenthoTorch (BT) is an in vivo fluorometer designed to quantify algal biomass and community composition benthic environments. BT quantifies total via chlorophyll a (Chl-a) concentration may differentiate among cyanobacteria, green algae, diatoms based on pigment fluorescence. To evaluate how measurements of periphytic (as Chl-a) compared with ethanol extraction laboratory analysis, we collected BT- laboratory-measured Chl-a data from 6 stream sites the Indian Creek basin,...
First posted March 31, 2017 For additional information, contact: Director, Kansas Water Science Center U.S. Geological Survey 4821 Quail Crest Place Lawrence, KS 66049https://ks.water.usgs.gov Cheney Reservoir, located in south-central Kansas, is one of the primary drinking-water supplies for city Wichita and an important recreational resource. Since 1990, cyanobacterial blooms have been present occasionally resulting increased treatment costs decreased use. Cyanobacteria, cyanotoxin...
Indian Creek is one of the most urban drainage basins in Johnson County, Kansas, and environmental biological conditions creek are affected by contaminants from point other sources. The County Douglas L. Smith Middle Basin (hereafter referred to as "Middle Basin") Tomahawk Wastewater Treatment Facilities (WWTFs) discharge Creek. In summer 2010, upgrades were completed increase capacity include nutrient removal at facility. There have been no recent infrastructure changes facility; however,...
Abstract Recent studies suggest that nitrogen additions to increase the total nitrogen:total phosphorus (TN:TP) ratio may reduce cyanobacterial biovolume and microcystin concentration in reservoirs. In systems where TP is >100 μg/L, however, TN:TP could cause ammonia, nitrate, or nitrite toxicity terrestrial aquatic organisms. Reducing via aluminum sulfate (alum) be needed prior aimed at increasing ratio. We experimentally tested this sequential management approach large situ mesocosms (70.7...
Cyanobacterial harmful algal blooms are one of the most prominent threats to water quality in freshwater ecosystems and expected become more common as climate continues change. While traditional strategies manage have focused on controlling nutrients, manipulating light a way reduce cyanobacteria is less frequently explored. Here, we propose addition glacial rock flour (GRF), fine particulate that floats water's surface remains suspended column, availability turn, phytoplankton biomass...
Wetlands play a disproportionate role in global climate as major sources and sinks of greenhouse gases. Herbicides are the most heavily used agrochemicals frequently detected aquatic ecosystems, with glyphosate 2,4-Dichlorophenoxyacetic acid (2,4-D), representing two commonly worldwide. In recent years, these herbicides being mixtures to combat herbicide-tolerant noxious weeds. While it is well documented that herbicide use for agriculture expected increase, their indirect impacts on...
Zooplankton abundance, community composition, and size can drive clear-water phases (CWPs) in temperate lakes. CWP events temporarily improve water transparency by decreasing algae, thus better understanding the mechanisms of could lead to improvements quality. Here, we evaluate how zooplankton composition (copepods, cladocerans), (only Daphnia) relate CWPs three Kansas reservoirs with different trophic states (i.e. mesotrophic, eutrophic, or hypereutrophic). Water was measured using a...
Kelly, AG, Harris, TD. 2024. Watershed grassland fires drive nutrient increases in replicated experimental ponds. Lake Reserv Manage. XX:XX–XX.