David P Krabbenhoft
David Krabbenhoft is a Scientist Emeritus with the Upper Midwest Water Science Center.
David Krabbenhoft received his Ph.D. from the University of Wisconsin-Madison in 1988 and has been a research scientist with the U.S. Geological Survey since. He has general research interests are in biogeochemistry and hydrogeology of aquatic ecosystems. Dave began working on environmental mercury cycling, transformations, and fluxes in aquatic ecosystems with the Mercury in Temperate Lakes project in 1988; since then, the topic has consumed his professional life. In 1994, Dave established the USGS’s Mercury Research Laboratory, which includes a team of multi-disciplinary mercury investigators and a state-of-the-art analytical facility strictly dedicated to low-level speciation analysis of mercury. In 1995 he initiated the multi-agency Aquatic Cycling of Mercury in the Everglades (ACME) project, which is still ongoing. More recently, Dave has been a Primary Investigator on the internationally conducted Mercury Experiment To Assess Atmospheric Loadings in Canada and the US (METAALICUS) project, which is a novel effort to examine the ecosystem-level response to loading an entire watershed with mercury. Currently, Dave’s research team is active on projects that span environments as far ranging as the Pacific Ocean to freshwater systems in Alaska to Florida, and from California to New England. In recent years, the Mercury Research Team entered into the realm of atmospheric research by constructing and deployed the USGS Mobile Atmospheric Mercury Lab, which has the capability for rapid deployment and advanced study of mercury in the atmosphere. Since 1990, he has authored or coauthored over 100 papers on mercury in the environment. In August 2006, Dave served as the Co-Chair for the 8th International Conference on Mercury as a Global Pollutant.
Professional Experience
Research Hydrologist/Geochemist, U.S. Geological Survey, Wisconsin Water Science Center, 8505 Research Way, Middleton, Wisconsin, July 1988 to present.
Adjunct, University of Wisconsin-Madison, 2001 to present.
USGS Mercury Research Lab, Team Leader, 1994 to present.
Education and Certifications
Ph.D. 1988, University of Wisconsin-Madsion, Department of Geology and Geophysics; research emphasis isotope geochemistry, limnology, and hydrogeology
M.S. 1984, University of Wisconsin-Madsion, Department of Geology and Geophysics; research emphasis geochemistry and hydrogeology
B.S. 1982, North Dakota St. University, Major: Geology, Minor: Chemistry
Honors and Awards
Shoemaker Lifetime Achievement Award for Excellence in Science Communications (October 2013)
USGS performance awards (received on 24 occasions from 1988-2013)
Department of the Interior, U.S. Geological Survey, In Recognition for Meritorious Service (2003)
Department of the Interior, U.S. Geological Survey, In Recognition for Superior Service (1997)
Exxon Research Scholarship, University of Wisconsin-Madison (1982)
Summa Cum Laude, North Dakota State University (19
Science and Products
Mercury isotopes reveal an ontogenetic shift in habitat use by walleye in lower Green Bay of Lake Michigan
Ratio of mercury concentration to PCB concentration varies with sex of white sucker (Catostomus commersonii)
Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington
Factors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes
Permafrost stores a globally significant amount of mercury
Stream mercury export in response to contemporary timber harvesting methods (Pacific Coastal Mountains, Oregon, USA)
Atmospheric deposition to forests in the eastern USA
Spatial dependence of reduced sulfur in Everglades dissolved organic matter controlled by sulfate enrichment
Mobilization of mercury and arsenic from a carbonate-hosted ore deposit, central Idaho, U.S.A.
Mercury and methylmercury in aquatic sediment across western North America
Sex differences in contaminant concentrations of fish: a synthesis
Mercury cycling in the Hells Canyon Complex of the Snake River, Idaho and Oregon
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Mercury isotopes reveal an ontogenetic shift in habitat use by walleye in lower Green Bay of Lake Michigan
In general, fish residing in rivers differ from fish residing in lakes in their mercury (Hg) isotope ratios. Specifically, fish residing in lakes typically show enriched values for the isotope ratios of δ202Hg (mass-dependent fractionation of isotope 202Hg) and Δ199Hg (mass-independent fractionation of isotope 199Hg) compared with fish residing in rivers, because photochemical effects acting on HgAuthorsCharles P. Madenjian, Sarah E. Janssen, Ryan F. Lepak, Jacob M. Ogorek, Tylor J. Rosera, John F. DeWild, David P. Krabbenhoft, Stewart F. Cogswell, Mark E. HoleyRatio of mercury concentration to PCB concentration varies with sex of white sucker (Catostomus commersonii)
The whole-fish total mercury (Hg) concentrations were determined in 25 mature female and 26 mature male white suckers (Catostomus commersonii) caught during their spawning run in the Kewaunee River, a tributary to Lake Michigan. The age of each fish was estimated using thin-sectioned otoliths, and total length (TL) and weight were determined for each fish. When adjusted for the effect of age, maleAuthorsCharles P. Madenjian, Andrew L. Stevens, Martin A. Stapanian, David P. Krabbenhoft, John F. DeWild, Jacob M. Ogorek, William H. Edwards, Lynn M. Ogilvie, Peter B. McIntyreMercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington
The U.S. Geological Survey evaluated the transformation of mercury to bioavailable methylmercury in Sinclair Inlet, Kitsap County, Washington, and assessed the effect of the transformation processes on the mercury burden in marine organisms and sediment. In August 2008, samples of sediment, water, and biota from six sites in Sinclair Inlet and three bays representative of Puget Sound embayments weAuthorsA.J. Paulson, M.C. Marvin-DiPasquale, P.W. Moran, J.F. DeWild, A.R. Stewart, J. Toft, J.L. Agee, E. Kakouros, Le H. Kieu, B. Carter, R.W. Sheibley, J. Cordell, David P. KrabbenhoftFactors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes
Identifying the sources of methylmercury (MeHg) and tracing the transformations of mercury (Hg) in the aquatic food web are important components of effective strategies for managing current and legacy Hg sources. In our previous work, we measured stable isotopes of Hg (δ202Hg, Δ199Hg, and Δ200Hg) in the Laurentian Great Lakes and estimated source contributions of Hg to bottom sediment. Here, we idAuthorsRyan F. Lepak, Sarah E. Janssen, Runsheng Yin, Jacob M. Ogorek, David P. Krabbenhoft, John F. DeWild, Michael T. Tate, Thomas M. Holsen, James P. HurleyPermafrost stores a globally significant amount of mercury
Changing climate in northern regions is causing permafrost to thaw with major implications for the global mercury (Hg) cycle. We estimated Hg in permafrost regions based on in situ measurements of sediment total mercury (STHg), soil organic carbon (SOC), and the Hg to carbon ratio (RHgC) combined with maps of soil carbon. We measured a median STHg of 43 ± 30 ng Hg g soil−1 and a median RHgC of 1.6AuthorsPaul F. Schuster, Kevin Schaefer, George R. Aiken, Ronald C. Antweiler, John F. DeWild, Joshua D. Gryziec, Alessio Gusmeroli, Gustaf Hugelius, Elchin E. Jafarov, David P. Krabbenhoft, Lin Liu, Nicole M. Herman-Mercer, Cuicui Mu, David A. Roth, Tim Schaefer, Robert G. Striegl, Kimberly P. Wickland, Tingjun ZhangStream mercury export in response to contemporary timber harvesting methods (Pacific Coastal Mountains, Oregon, USA)
Land-use activities can alter hydrological and biogeochemical processes that can affect the fate, transformation, and transport of mercury (Hg). Previous studies in boreal forests have shown that forestry operations can have profound, but variable effects on Hg export and methylmercury (MeHg) formation. The Pacific Northwest is an important timber producing region that receives large atmosphericAuthorsChris S. Eckley, Collin A. Eagles-Smith, Michael T. Tate, Brandon M Kowalski, Robert Danehy, Sherri L Johnson, David P. KrabbenhoftAtmospheric deposition to forests in the eastern USA
Atmospheric mercury (Hg) deposition to forests is important because half of the land cover in the eastern USA is forest. Mercury was measured in autumn litterfall and weekly precipitation samples at a total of 27 National Atmospheric Deposition Program (NADP) monitoring sites in deciduous and mixed deciduous-coniferous forests in 16 states in the eastern USA during 2007–2014. These simultaneous, uAuthorsMartin R. Risch, John F. DeWild, David A. Gay, Leiming Zhang, Elizabeth W. Boyer, David P. KrabbenhoftSpatial dependence of reduced sulfur in Everglades dissolved organic matter controlled by sulfate enrichment
Sulfate inputs to the Florida Everglades stimulate sulfidic conditions in freshwater wetland sediments that affect ecological and biogeochemical processes. An unexplored implication of sulfate enrichment is alteration of the content and speciation of sulfur in dissolved organic matter (DOM), which influences the reactivity of DOM with trace metals. Here, we describe the vertical and lateral spatiaAuthorsBrett A. Poulin, Joseph N. Ryan, Kathryn L. Nagy, Aron Stubbins, Thorsten Dittmar, William H. Orem, David P. Krabbenhoft, George R. AikenMobilization of mercury and arsenic from a carbonate-hosted ore deposit, central Idaho, U.S.A.
The Cinnabar and Fern mine sites in central Idaho are primary source areas for elevated mercury and arsenic entering the South Fork of the Salmon River, which provides critical spawning habitat for bull trout and Chinook salmon. Mercury mineralization is hosted by carbonate rocks, which generate waters dominated by Ca2+ and HCO3 - at pH 7 to 9. A synoptic sampling was conducted on headwater tributAuthorsJoAnn M. Holloway, Michael Pribil, R. Blaine McCleskey, Alexandra B. Etheridge, David P. Krabbenhoft, George R. AikenMercury and methylmercury in aquatic sediment across western North America
Large-scale assessments are valuable in identifying primary factors controlling total mercury (THg) and monomethyl mercury (MeHg) concentrations, and distribution in aquatic ecosystems. Bed sediment THg and MeHg concentrations were compiled for > 16,000 samples collected from aquatic habitats throughout the West between 1965 and 2013. The influence of aquatic feature type (canals, estuaries, lakesAuthorsJacob Fleck, Mark C. Marvin-DiPasquale, Collin A. Eagles-Smith, Joshua T. Ackerman, Michelle A. Lutz, Michael T. Tate, Charles N. Alpers, Britt D. Hall, David P. Krabbenhoft, Chris S. EckleyByEcosystems Mission Area, Water Resources Mission Area, Environmental Health Program, Toxic Substances Hydrology, California Water Science Center, Forest and Rangeland Ecosystem Science Center, John Wesley Powell Center for Analysis and Synthesis, Upper Midwest Water Science Center, Mercury Research LaboratorySex differences in contaminant concentrations of fish: a synthesis
Comparison of whole-fish polychlorinated biphenyl (PCB) and total mercury (Hg) concentrations in mature males with those in mature females may provide insights into sex differences in behavior, metabolism, and other physiological processes. In eight species of fish, we observed that males exceeded females in whole-fish PCB concentration by 17 to 43%. Based on results from hypothesis testing, weAuthorsCharles P. Madenjian, Richard R. Rediske, David P. Krabbenhoft, Martin A. Stapanian, Sergei M. Chernyak, James P. O'KeefeMercury cycling in the Hells Canyon Complex of the Snake River, Idaho and Oregon
Introduction The Hells Canyon Complex (HCC) is a hydroelectric project built and operated by the Idaho Power Company (IPC) that consists of three dams on the Snake River along the Oregon and Idaho border (fig. 1). The dams have resulted in the creation of Brownlee, Oxbow, and Hells Canyon Reservoirs, which have a combined storage capacity of more than 1.5 million acre-feet and span about 90 milesAuthorsGregory M. Clark, Jesse Naymik, David P. Krabbenhoft, Collin A. Eagles-Smith, George R. Aiken, Mark C. Marvin-DiPasquale, Reed C. Harris, Ralph Myers - Web Tools
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