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 in fish, bed sediment, and water from streams across the United States, 1998-2005
Impact of wildfire on levels of mercury in forested watershed systems - Voyageurs National Park, Minnesota
Experimental removal of wetland emergent vegetation leads to decreased methylmercury production in surface sediment
Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning
Methylmercury enters an aquatic food web through acidophilic microbial mats in Yellowstone National Park, Wyoming
Mercury cycling in stream ecosystems. 1. Water column chemistry and transport
Investigation of uptake and retention of atmospheric Hg(II) by boreal forest plants using stable Hg isotopes
Obtaining parsimonious hydraulic conductivity fields using head and transport observations: A Bayesian geostatistical parameter estimation approach
Mercury sources, distribution, and bioavailability in the North Pacific Ocean: Insights from data and models
Geological, geochemical, and geophysical studies by the U.S. Geological Survey in Big Bend National Park, Texas
Total mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04
White sturgeon mitigation and restoration in the Columbia and Snake rivers upstream from Bonneville Dam, Annual Progress Report April 2006 - March 2007. Report C
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Mercury in fish, bed sediment, and water from streams across the United States, 1998-2005
Mercury (Hg) was examined in top-predator fish, bed sediment, and water from streams that spanned regional and national gradients of Hg source strength and other factors thought to influence methylmercury (MeHg) bioaccumulation. Sampled settings include stream basins that were agricultural, urbanized, undeveloped (forested, grassland, shrubland, and wetland land cover), and mined (for gold and Hg)AuthorsBarbara C. Scudder, Lia C. Chasar, Dennis A. Wentz, Nancy J. Bauch, Mark E. Brigham, Patrick W. Moran, David P. KrabbenhoftImpact of wildfire on levels of mercury in forested watershed systems - Voyageurs National Park, Minnesota
Atmospheric deposition of mercury to remote lakes in mid-continental and eastern North America has increased approximately threefold since the mid-1800s (Swain and others, 1992; Fitzgerald and others, 1998; Engstrom and others, 2007). As a result, concerns for human and wildlife health related to mercury contamination have become widespread. Despite an apparent recent decline in atmospheric deposiAuthorsLaurel G. Woodruff, Mark B. Sandheinrich, Mark E. Brigham, William F. CannonExperimental removal of wetland emergent vegetation leads to decreased methylmercury production in surface sediment
We performed plant removal (devegetation) experiments across a suite of ecologically diverse wetland settings (tidal salt marshes, river floodplain, rotational rice fields, and freshwater wetlands with permanent or seasonal flooding) to determine the extent to which the presence (or absence) of actively growing plants influences the activity of the Hg(II)-methylating microbial community and the avAuthorsLisamarie Windham-Myers, Mark Marvin-DiPasquale, David P. Krabbenhoft, Jennifer L. Agee, Marisa H. Cox, Pilar Heredia-Middleton, Carolyn Coates, Evangelos KakourosMercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment - Pore water partitioning
Mercury speciation, controls on methylmercury (MeHg) production, and bed sediment−pore water partitioning of total Hg (THg) and MeHg were examined in bed sediment from eight geochemically diverse streams where atmospheric deposition was the predominant Hg input. Across all streams, sediment THg concentrations were best described as a combined function of sediment percent fines (%fines; particles <AuthorsMark Marvin-DiPasquale, Michelle A. Lutz, Mark E. Brigham, David P. Krabbenhoft, George R. Aiken, William H. Orem, Britt D. HallMethylmercury enters an aquatic food web through acidophilic microbial mats in Yellowstone National Park, Wyoming
Microbial mats are a visible and abundant life form inhabiting the extreme environments in Yellowstone National Park (YNP), WY, USA. Little is known of their role in food webs that exist in the Park's geothermal habitats. Eukaryotic green algae associated with a phototrophic green/purple Zygogonium microbial mat community that inhabits low-temperature regions of acidic (pH ∼ 3.0) thermal springs wAuthorsEric S. Boyd, S. King, J.K. Tomberlin, D. Kirk Nordstrom, D. P. Krabbenhoft, T. Barkay, G. G. GeeseyMercury cycling in stream ecosystems. 1. Water column chemistry and transport
We studied total mercury (THg) and methylmercury (MeHg) in eight streams, located in Oregon, Wisconsin, and Florida, that span large ranges in climate, landscape characteristics, atmospheric Hg deposition, and water chemistry. While atmospheric deposition was the source of Hg at each site, basin characteristics appeared to mediate this source by providing controls on methylation and fluvial THg anAuthorsM. E. Brigham, D.A. Wentz, G. R. Aiken, D. P. KrabbenhoftInvestigation of uptake and retention of atmospheric Hg(II) by boreal forest plants using stable Hg isotopes
Although there is now a general consensus among mercury (Hg) biogeochemists that increased atmospheric inputs of inorganic Hg(II) to lakes and watersheds can result in increased methylmercury (MeHg) concentrations in fish, researchers still lack kinetic data describing the movement of Hg from the atmosphere, through watershed and lake ecosystems, and into fish. The use of isotopically enriched HgAuthorsJ.A. Graydon, V.L. St. Louis, H. Hintelmann, S.E. Lindberg, K.A. Sandilands, J.W.M. Rudd, C.A. Kelly, M.T. Tate, D. P. Krabbenhoft, I. LehnherrObtaining parsimonious hydraulic conductivity fields using head and transport observations: A Bayesian geostatistical parameter estimation approach
Flow path delineation is a valuable tool for interpreting the subsurface hydrogeochemical environment. Different types of data, such as groundwater flow and transport, inform different aspects of hydrogeologic parameter values (hydraulic conductivity in this case) which, in turn, determine flow paths. This work combines flow and transport information to estimate a unified set of hydrogeologic paraAuthorsMichael N. Fienen, R. Hunt, D. Krabbenhoft, T. ClemoMercury sources, distribution, and bioavailability in the North Pacific Ocean: Insights from data and models
Fish harvested from the Pacific Ocean are a major contributor to human methylmercury (MeHg) exposure. Limited oceanic mercury (Hg) data, particularly MeHg, has confounded our understanding of linkages between sources, methylation sites, and concentrations in marine food webs. Here we present methylated (MeHg and dimethylmercury (Me2Hg)) and total Hg concentrations from 16 hydrographic stations inAuthorsE.M. Sunderland, D. P. Krabbenhoft, J.W. Moreau, S.A. Strode, W.M. LandingGeological, geochemical, and geophysical studies by the U.S. Geological Survey in Big Bend National Park, Texas
Big Bend National Park (BBNP), Tex., covers 801,163 acres (3,242 km2) and was established in 1944 through a transfer of land from the State of Texas to the United States. The park is located along a 118-mile (190-km) stretch of the Rio Grande at the United States-Mexico border. The park is in the Chihuahuan Desert, an ecosystem with high mountain ranges and basin environments containing a wide varAuthorsW. R. Page, K. J. Turner, R. G. Bohannon, M. E. Berry, V. S. Williams, D. P. Miggins, M. Ren, E. Y. Anthony, L. A. Morgan, P. W. C. Shanks, J. E. Gray, P. M. Theodorakos, David P. Krabbenhoft, A. H. Manning, P. A. Gemery-Hill, E. C. Hellgren, C. A. Stricker, D. P. Onorato, C. A. Finn, E. AndersonTotal mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04
Mercury contamination of aquatic ecosystems is an issue of national concern, affecting both wildlife and human health. Detailed information on mercury cycling and food-web bioaccumulation in stream settings and the factors that control these processes is currently limited. In response, the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) conducted detailed studies frAuthorsMark C. Marvin-DiPasquale, Michelle A. Lutz, David P. Krabbenhoft, George R. Aiken, William H. Orem, Britt D. Hall, John F. DeWild, Mark E. BrighamWhite sturgeon mitigation and restoration in the Columbia and Snake rivers upstream from Bonneville Dam, Annual Progress Report April 2006 - March 2007. Report C
Describe reproduction and early life history characteristics of white sturgeon populations in the Columbia River between Bonneville and Priest Rapids dams. Define habitat requirements for spawning and rearing white sturgeon and quantify the extent of habitat available in the Columbia River between Bonneville and Priest Rapids dams. Progress updates on young-of-the-year recruitment in Bonneville ReAuthorsM.J. Parsley, P. Kofoot - Web Tools
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