Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
GeoHEALTH-USGS Newsletter
GeoHEALTH-USGS Newsletter
The GeoHEALTH–USGS Newsletter—published since 2004—provides information on USGS science activities pertinent to safeguarding the health of fish, wildlife, domesticated animals, and people from environmental exposures to contaminants and pathogens.
Featured Science Activities
Featured Science Activities
Learn about our Featured Science Activities through our pages that highlight studies, publications, and results.
Filter Total Items: 4098
Relations between stream temperature discharge, and stream/groundwater interaction along several mountain streams Relations between stream temperature discharge, and stream/groundwater interaction along several mountain streams
No abstract available.
Authors
James Constantz, G. Zellweger
Occurrence and distribution of pesticides in streams of the Midwestern United States Occurrence and distribution of pesticides in streams of the Midwestern United States
No abstract available.
Authors
D. A. Goolsby, William A. Battaglin
Isotope tracers on water and solute sources in catchments Isotope tracers on water and solute sources in catchments
No abstract available.
Authors
Carol Kendall, C. Sklash, Thomas D. Bullen
Transport of reacting solutes in rivers and streams Transport of reacting solutes in rivers and streams
In this chapter we discuss the major processes affecting solutes in rivers and streams. Here a solute is generally defined as any substance or entity that is transported downstream by the flowing waters. Under this definition, solutes may be pollutants, such as pesticides and hydrocarbons, or naturally occurring substances such as dissolved gases, nutrients, and trace elements. Study of...
Authors
Robert L. Runkel, Kenneth E. Bencala
The role of climate in estuarine variability The role of climate in estuarine variability
No abstract available.
Authors
D. H. Peterson, D. Cayan, J. DiLeo, M. Noble, M. Dettinger
Assessing nonpoint-source pollution risk: A GIS application Assessing nonpoint-source pollution risk: A GIS application
No abstract available.
Authors
Kenneth J. Lull, James A. Tindall, Donald F. Potts
Phosphate dynamics in an acidic mountain stream: Interactions involving algal uptake, sorption by iron oxide, and photoreduction Phosphate dynamics in an acidic mountain stream: Interactions involving algal uptake, sorption by iron oxide, and photoreduction
Acid mine drainage streams in the Rocky Mountains typically have few algal species and abundant iron oxide deposits which can sorb phosphate. An instream injection of radiolabeled phosphate (32P0,) into St. Kevin Gulch, an acid mine drainage stream, was used to test the ability of a dominant algal species, Ulothrix sp., to rapidly assimilate phosphate. Approximately 90% of the injected...
Authors
Cathy M. Tate, Robert E. Broshears, Diane M. McKnight
Mantle helium in ground waters of eastern North America: Time and space constraints on sources Mantle helium in ground waters of eastern North America: Time and space constraints on sources
Mantle helium in continental environments is generally considered to be the result of active volcanism and/or active extension. The latest episodes of volcanism in northeastern North America are the track of the New England hotspot (95–190 Ma) and the closure of the Iapetus sea (before 300 Ma). Thus, the identification of mantle helium in young ground waters of central New England is...
Authors
T. Torgersen, S. Drenkard, M. Stute, P. Schlosser, A. Shapiro
Characterization of a high-transmissivity zone by well test analysis: Steady state case Characterization of a high-transmissivity zone by well test analysis: Steady state case
A method is developed to analyze steady horizontal flow to a well pumped from a confined aquifer composed of two homogeneous zones with contrasting transmissivities. Zone 1 is laterally unbounded and encloses zone 2, which is elliptical in shape and is several orders of magnitude more transmissive than zone 1. The solution for head is obtained by the boundary integral equation method...
Authors
Claire R. Tiedeman, Paul A. Hsieh, Sarah B. Christian
Year-to-year fluctuation of the spring phytoplankton bloom in south San Francisco Bay: An example of ecological variability at the land-sea interface Year-to-year fluctuation of the spring phytoplankton bloom in south San Francisco Bay: An example of ecological variability at the land-sea interface
Estuaries are transitional ecosystems at the interface of the terrestrial and marine realms. Their unique physiographic position gives rise to large spatial variability, and to dynamic temporal variability resulting, in part, from a variety of forces and fluxes at the oceanic and terrestrial boundaries. River flow, in particular, is an important mechanism for delivering watershed-derived...
Authors
James E. Cloern, Alan D. Jassby
Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the Carson River, Nevada Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the Carson River, Nevada
Sediments from mercury-contaminated and uncontaminated reaches of the Carson River, Nevada, were assayed for sulfate reduction, methanogenesis, denitrification, and monomethylmercury (MeHg) degradation. Demethylation of [14C]MeHg was detected at all sites as indicated by the formation of 14CO2 and 14CH4. Oxidative demethylation was indicated by the formation of 14CO2 and was present at...
Authors
R.S. Oremland, L.G. Miller, P. Dowdle, T. Connell, T. Barkay
Growth of strain SES-3 with arsenate and other diverse electron acceptors Growth of strain SES-3 with arsenate and other diverse electron acceptors
The selenate-respiring bacterial strain SES-3 was able to use a variety of inorganic electron acceptors to sustain growth. SES-3 grew with the reduction of arsenate to arsenite, Fe(III) to Fe(II), or thiosulfate to sulfide. It also grew in medium in which elemental sulfur, Mn(IV), nitrite, trimethylamine N-oxide, or fumarate was provided as an electron acceptor. Growth on oxygen was
Authors
A.M. Laverman, J.S. Blum, J.K. Schaefer, Elizabeth J.P. Phillips, Derek R. Lovley, R.S. Oremland