Jeff's research focuses on the transport of and biological response to nutrients. Most of the research occurs in the Midwest, primarily in the Cornbelt ecoregion. Recently the focus has been on edge of field studies and Super gages (especially continuous nitrate and orthophosphate) to better understand transport of nutrients.
Jeff received his B.S. from the University of Minnesota in Environmental Studies in 1986 and his M.S. from the Indiana University School of Public and Environmental Affairs in 1992. He began working with the USGS after graduate school in Indiana with the National Water-Quality Assessment (NAWQA) Program and has held several positions since then. Currently, he is the Indiana Deputy Director of the USGS Indiana-Kentucky Water Science Center in Indianapolis. Other non-USGS work highlights includes working with Peace Corps in Cameroon teaching inland fisheries (1986-88) and as an observer with the National Marine Fisheries Service off of Alaska (1990).
Science and Products
Understanding the influence of nutrients on stream ecosystems in agricultural landscapes
Relative importance of water-quality stressors in predicting fish community responses in midwestern streams
High nitrate concentrations in some Midwest United States streams in 2013 after the 2012 drought
Stream sediment sources in midwest agricultural basins with land retirement along channel
Identifying nutrient reference sites in nutrient-enriched regions-Using algal, invertebrate, and fish-community measures to identify stressor-breakpoint thresholds in Indiana rivers and streams, 2005-9
The Midwest Stream Quality Assessment
USGS library for S-PLUS for Windows -- Release 4.0
Assessment of nutrient enrichment by use of algal-, invertebrate-, and fish-community attributes in wadeable streams in ecoregions surrounding the Great Lakes
Breakpoint analysis and assessment of selected stressor variables on benthic macroinvertebrate and fish communities in Indiana streams: Implications for developing nutrient criteria
The influence of nutrients and physical habitat in regulating algal biomass in agricultural streams
Biological-Community Composition in Small Streams and its Relations to Habitat, Nutrients, and Land Use in Agriculturally Dominated Landscapes in Indiana and Ohio, 2004, and Implications for Assessing Nutrient Conditions in Midwest Streams
Occurrence and distribution of algal biomass and Its relation to nutrients and selected basin characteristics in Indiana streams, 2001-2005
Environmental Effects of Agricultural Practices
Ohio-Kentucky-Indiana Collaboration Partners
Biological Response to Nutrients
Transport and Fate of Nutrients
Science and Products
Filter Total Items: 25
Understanding the influence of nutrients on stream ecosystems in agricultural landscapesSustaining the quality of the Nation’s water resources and the health of our diverse ecosystems depends on the availability of sound water-resources data and information to develop effective, science-based policies. Effective management of water resources also brings more certainty and efficiency to important economic sectors. Taken together, these actions lead to immediate and long-term economic,AuthorsMark D. Munn, Jeffrey W. Frey, Anthony J. Tesoriero, Robert W. Black, John H. Duff, Kathy Lee, Terry R. Maret, Christopher A. Mebane, Ian R. Waite, Ronald B. Zelt
Relative importance of water-quality stressors in predicting fish community responses in midwestern streamsFish, habitat, and water chemistry data were collected from 98 streams in the midwestern United States, an area dominated by intense cultivation of row crops, in order to identify important water‐quality stressors to fish communities. We focused on 10 stressors including riparian disturbance, riparian vegetative cover, instream fish cover, streambed sedimentation, streamflow variability, total nitAuthorsMichael R. Meador, Jeffrey W. Frey
High nitrate concentrations in some Midwest United States streams in 2013 after the 2012 droughtNitrogen sources in the Mississippi River basin have been linked to degradation of stream ecology and to Gulf of Mexico hypoxia. In 2013, the USGS and the USEPA characterized water quality stressors and ecological conditions in 100 wadeable streams across the midwestern United States. Wet conditions in 2013 followed a severe drought in 2012, a weather pattern associated with elevated nitrogen concAuthorsPeter C. Van Metre, Jeffrey W. Frey, MaryLynn Musgrove, Naomi Nakagaki, Sharon Qi, Barbara Mahler, Michael E. Wieczorek, Daniel T. Button
Stream sediment sources in midwest agricultural basins with land retirement along channelDocumenting the effects of agricultural land retirement on stream-sediment sources is critical to identifying management practices that improve water quality and aquatic habitat. Particularly difficult to quantify are the effects from conservation easements that commonly are discontinuous along channelized streams and ditches throughout the agricultural midwestern United States. Our hypotheses werAuthorsTanja N. Williamson, Victoria G. Christensen, William B. Richardson, Jeffrey W. Frey, Allen C. Gellis, K. A. Kieta, Faith A. Fitzpatrick
Identifying nutrient reference sites in nutrient-enriched regions-Using algal, invertebrate, and fish-community measures to identify stressor-breakpoint thresholds in Indiana rivers and streams, 2005-9Excess nutrients in aquatic ecosystems can lead to shifts in species composition, reduced dissolved oxygen concentrations, fish kills, and toxic algal blooms. In this study, nutrients, periphyton chlorophyll a (CHLa), and invertebrate- and fishcommunity data collected during 2005-9 were analyzed from 318 sites on Indiana rivers and streams. The objective of this study was to determine which invertAuthorsBrian J. Caskey, Aubrey R. Bunch, Megan E. Shoda, Jeffrey W. Frey, Shivi Selvaratnam, Robert J. Miltner
The Midwest Stream Quality AssessmentIn 2013, the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) and USGS Columbia Environmental Research Center (CERC) will be collaborating with the U.S. Environmental Protection Agency (EPA) National Rivers and Streams Assessment (NRSA) to assess stream quality across the Midwestern United States. The sites selected for this study are a subset of the larger NRSA, impAuthorsPeter C. Van Metre, Jeffrey W. Frey, Ellen Tarquinio
USGS library for S-PLUS for Windows -- Release 4.0Release 4.0 of the U.S. Geological Survey S-PLUS library supercedes release 2.1. It comprises functions, dialogs, and datasets used in the U.S. Geological Survey for the analysis of water-resources data. This version does not contain ESTREND, which was in version 2.1. See Release 2.1 for information and access to that version. This library requires Release 8.1 or later of S-PLUS for Windows. S-PLAuthorsDavid L. Lorenz, Elizabeth A. Ahearn, Janet M. Carter, Timothy A. Cohn, Wendy J. Danchuk, Jeffrey W. Frey, Dennis R. Helsel, Kathy Lee, David C. Leeth, Jeffrey D. Martin, Virginia L. McGuire, Kathleen M. Neitzert, Dale M. Robertson, James R. Slack, J. Jeffrey Starn, Aldo V. Vecchia, Donald H. Wilkison, Joyce E. Williamson
Assessment of nutrient enrichment by use of algal-, invertebrate-, and fish-community attributes in wadeable streams in ecoregions surrounding the Great LakesThe algal, invertebrate, and fish taxa and community attributes that best reflect the effects of nutrients along a gradient of low to high nutrient concentrations in wadeable, primarily midwestern streams were determined as part of the U.S. Geological Suvey's National Water-Quality Assessment (NAWQA) Program. Nutrient data collected from 64 sampling sites that reflected reference, agricultural, anAuthorsJeffrey W. Frey, Amanda H. Bell, Julie A. Hambrook Berkman, David L. Lorenz
Breakpoint analysis and assessment of selected stressor variables on benthic macroinvertebrate and fish communities in Indiana streams: Implications for developing nutrient criteriaWater chemistry, periphyton and seston chlorophyll a (CHLa), and biological community data were collected from 321 sites from 2001 through 2005 to (1) determine statistically and ecologically significant relations among the stressor (total nitrogen, total phosphorus, periphyton and seston CHLa, and turbidity) variables and response (biological community) variables; and, (2) determine the breakpoinAuthorsBrian J. Caskey, Jeffrey W. Frey, Shivi Selvaratnam
The influence of nutrients and physical habitat in regulating algal biomass in agricultural streamsThis study examined the relative influence of nutrients (nitrogen and phosphorus) and habitat on algal biomass in five agricultural regions of the United States. Sites were selected to capture a range of nutrient conditions, with 136 sites distributed over five study areas. Samples were collected in either 2003 or 2004, and analyzed for nutrients (nitrogen and phosphorous) and algal biomass (chlorAuthorsMark D. Munn, Jeffrey W. Frey, Anthony J. Tesoriero
Biological-Community Composition in Small Streams and its Relations to Habitat, Nutrients, and Land Use in Agriculturally Dominated Landscapes in Indiana and Ohio, 2004, and Implications for Assessing Nutrient Conditions in Midwest StreamsThe objective of this study was to relate algal-, invertebrate-, and fish-community composition to habitat, nutrients, and land-use variables in small streams in agriculturally dominated landscapes of the Midwest in Indiana and Ohio. Thirty sample locations were selected from a single ecoregion; all were small wadable streams within agriculturally dominated landscapes with similar substrate and caAuthorsBrian J. Caskey, Jeffrey W. Frey
Occurrence and distribution of algal biomass and Its relation to nutrients and selected basin characteristics in Indiana streams, 2001-2005Algal biomass and nutrient data were gathered at 322 randomly selected sites on 261 streams in the West Fork White River, Whitewater River, East Fork White River, Upper Wabash River, Kankakee River, Lower Wabash River, Tributaries to the Great Lakes, and Tributaries to the Ohio River Basins in Indiana from May through October for years 2001 through 2005. Basin characteristics (land use and drainagAuthorsB. Scott Lowe, Donald R. Leer, Jeffrey W. Frey, Brian J. Caskey
Environmental Effects of Agricultural PracticesAs agricultural land in the Minnesota River Basin is retired, tile drains are removed or broken and riparian corridors are planted to reduce runoff. Early studies saw decreased sediment and nitrogen and improved biological indicators but no significant changes in phosphorus. This project continues to investigate the linkages between riparian buffer extent, age, and continuity; stream water; and...
Ohio-Kentucky-Indiana Collaboration PartnersOne of the strongest ways to ensure that science is done effectively and efficiently in the midst of ever decreasing budgets is to collaborate.
Ecological MonitoringScientists research biology, botany, microbiology, habitat, climate, water quality, and other fields to achieve a comprehensive view of ecosystems and their health. Ecosystems can be easily stressed by human activities, climate change, sediment, nutrients, contaminants, and many other variables. Ecosystem monitoring is critical to ecosystem health and answers important questions about the...
Biological Response to NutrientsEutrophication, or excess nutrients in streams, is typically one of the top reasons that a stream is listed as impaired on the 303(d) list as part of the Clean Water Act.
Transport and Fate of NutrientsEutrophication, or excess nutrients in streams, is typically one of the top reasons that a stream is listed as impaired on the 303(d) list as part of the Clean Water Act. How nutrients, primarily nitrogen and phosphorus, are transported to streams and groundwater greatly affects the best management plan to keep them on fields and out of streams and groundwater. Likewise, environmental managers and...