Victoria G Christensen

Algal toxins and Mycobacterium avium ssp. paratuberculosis measured in surface-water, quarry-water, and sediment samples collected at Pipestone National Monument, Pipestone, Minnesota, 2018-19

The U.S. Geological Survey, in cooperation with the U.S. National Park Service, conducted a study to determine the presence of algal toxins and Mycobacterium avium ssp. paratuberculosis (MAP) within Pipestone National Monument located in Pipestone County in southwestern Minnesota. Three algal toxins (microcystins, saxitoxin, and anatoxin-a) were analyzed in 12 water-quality samples collected from 8 surface and 2 quarry-water sample sites by enzyme-linked immunosorbent assay (ELISA) methods. Two of the three analyzed algal toxins (microcystins and anatoxin-a) were also analyzed using immunosorbent strip test methods. All analysis kits were provided by Eurofins Abraxis Inc. (Warminister, Pa) and analyses were completed...

Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: USGS Science Data Catalog (SDC), Water Quality, Water Resources

Phytoplankton enumeration and identification from recurring algal bloom locations in Kabetogama Lake, northern Minnesota, 2016-2017

This data release provides phytoplankton identification, phytoplankton enumeration, chlorophyll concentration, phaeophytin concentration, phycocyanin data, and nutrient quality assurance data from three recurring algal bloom sites in Kabetogama Lake, Voyaguers National Park, Minnesota in 2016 and 2017. The goal of this research is to better understand the drivers of algal bloom toxicity in the large lakes of Voyageurs National Park so that resource managers may better predict, manage, and mitigate the occurrence of harmful algal blooms. A total of 126 environmental samples were collected at three recreational areas where blooms frequently occur. One site, Sullivan Bay, was chosen for more intensive sampling, including...

Categories: Data; Tags: Algal blooms, Kabetogama Lake, Koochiching, Lakes, Minnesota, All tags... Phytoplankon, St. Louis Counties, Minnesota, USGS Science Data Catalog (SDC), Voyageurs National Park, biota, Fewer tags

Rapid assessment test strip data for determining cyanotoxin presence in algal blooms, Kabetogama Lake, northern Minnesota, 2017-2018

Algal toxins are a growing concern worldwide. Rapid assessment test strips are a newer technology and their accuracy in detecting toxins in different lakes with different phytoplankton and toxins present is unknown. This data release is supported by our testing of toxin test strips. This research took place in Voyageurs National Park in northern Minnesota. The research will indicate whether these test strips are accurate for this system, and hopefully lay the foundation for a cost-effective harmful algal blooms (HABs) monitoring and communication tool for Voyageurs National Park and other parks. The utility of the test strips in this system may lead to broader applications, for instance in other inland systems like...

Categories: Data; Tags: Algal blooms, Koochiching, Lakes, Minnesota, Phytoplankton, All tags... St. Louis Counties, Minnesota, USGS Science Data Catalog (SDC), biota, Fewer tags

Chemical and physical data for sediment source fingerprinting of suspended and bottom sediment in the West Fork of Beaver Creek, Minnesota

This data release includes physical and chemical data for samples from suspended and bottom sediments of streams in Minnesota. Data were collected in September 2011 and April 2012. These data include total nitrogen and carbon, organic carbon, concentrations for 39 metals, and particle-size analysis. Source samples were grouped into one of three land-use categories: channel (Mid-bank,Low-bank), cropland (corn, sugar beets, soybeans, bare field), or road. These data were used for source attribution in order to quantify the proportional contribution of individual sources to suspend sediment in the basin.

Categories: Data; Tags: Minnesota, Renville, USGS Science Data Catalog (SDC), Water Resources, agriculture, All tags... environment, field monitoring stations, inlandWaters, land use and land cover, sediment transport, surface water quality, suspended material, Fewer tags

Multiple linear regression models were developed using data collected in 2016 and 2017 from three recurring bloom sites in Kabetogama Lake in northern Minnesota. These models were developed to predict concentrations of cyanotoxins (anatoxin-a, microcystin, and saxitoxin) that occur within the blooms. Virtual Beach software (version 3.0.6) was used to develop four models: two cyanotoxin mixture (MIX) models and two microcystin (MC) models. Models include those using readily available environmental variables (for example, wind speed and specific conductance) and those using additional comprehensive variables (based on laboratory analyses). Many of the independent variables were averages over a certain time period...

Categories: Data; Tags: Kabetogama Lake, Koochiching County Minnesota, Minnesota, USGS Science Data Catalog (SDC), Voyageurs National Park, All tags... Water Quality, Water Resources, cyanobacteria ["blue-green algae"], cyanotoxin mixtures, harmful algal blooms, inlandWaters, recreational water quality, Fewer tags