Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10379
Effects of current-use pesticides on amphibians Effects of current-use pesticides on amphibians
For many years, amphibians were understudied in the ecotoxicological literature. In 1989, the Canadian Wildlife Service published a comprehensive review of studies examining the effects of contaminants on amphibians (Power et al. 1989). Just 10 years later, the same organization published an updated review that included twice the number of studies (Pauli et al. 2000), indicating rapid...
Authors
C. Lehman, B K Williams
Effect of numerical dispersion as a source of structural noise in the calibration of a highly parameterized saltwater intrusion model Effect of numerical dispersion as a source of structural noise in the calibration of a highly parameterized saltwater intrusion model
A model with a small amount of numerical dispersion was used to represent saltwater 7 intrusion in a homogeneous aquifer for a 10-year historical calibration period with one 8 groundwater withdrawal location followed by a 10-year prediction period with two groundwater 9 withdrawal locations. Time-varying groundwater concentrations at arbitrary locations in this low-10 dispersion model...
Authors
Christian D. Langevin, Joseph D. Hughes
Measurement-derived heat-budget approaches for simulating coastal wetland temperature with a hydrodynamic model Measurement-derived heat-budget approaches for simulating coastal wetland temperature with a hydrodynamic model
Numerical modeling is needed to predict environmental temperatures, which affect a number of biota in southern Florida, U.S.A., such as the West Indian manatee (Trichechus manatus), which uses thermal basins for refuge from lethal winter cold fronts. To numerically simulate heat-transport through a dynamic coastal wetland region, an algorithm was developed for the FTLOADDS coupled...
Authors
Eric Swain, Jeremy Decker
Potential effects of coal bed natural gas development on fish and aquatic resources Potential effects of coal bed natural gas development on fish and aquatic resources
The purpose of this chapter is to provide a summary of issues and findings related to the potential effects of coalbed natural gas (CBNG) development on fish and other aquatic resources. We reviewed CBNG issues from across the United States and used the Powder River Basin of Wyoming as a case study to exemplify some pertinent issues. The quality of water produced during CBNG extraction...
Authors
Aida M. Farag, D.D. Harper, W.A. Hubert, A.E. Hubert
What you need to know about selenium What you need to know about selenium
No abstract available.
Authors
T. Young, K. Finley, William J. Adams, John M. Besser, W. A. Hopkins, D.B. Jolley, J. Martin-McNaughton, Theresa S. Presser, D.P. Shaw, J. M. Unrine
Effects of model layer simplification using composite hydraulic properties Effects of model layer simplification using composite hydraulic properties
The effects of simplifying hydraulic property layering within an unconfined aquifer and the underlying confining unit were assessed. The hydraulic properties of lithologic units within the unconfined aquifer and confining unit were computed by analyzing the aquifer-test data using radial, axisymmetric two-dimensional (2D) flow. Time-varying recharge to the unconfined aquifer and pumping...
Authors
Nicasio Sepulveda, Eve L. Kuniansky
Biodegration of chlorinated ethenes Biodegration of chlorinated ethenes
Biodegradation of chlorinated ethenes by naturally occurring or artificially enhanced processes is an important component of current site remediation strategies. At this writing, several microbial mechanisms for chlorinated ethene transformation and degradation have been identified. The purpose of this chapter is to briefly summarize the current understanding of those processes that lead...
Authors
Paul M. Bradley, Francis H. Chapelle
Recent advancements in amphibian ecotoxicology Recent advancements in amphibian ecotoxicology
When the first edition of Ecotoxicology of Amphibians and Reptiles was published in 2000, I reviewed the state of the literature from 1972 through 1998 (Sparling et al. 2000). That review covered 11 271 contaminant citations listed in Wildlife Review and Sports Fisheries Abstracts published by the US Fish and Wildlife Service. Among its findings, only 2.7% of the cited papers were on...
Authors
Donald Sparling, Greg Linder, Christine A. Bishop, Sherry K. Krest
Physiological ecology of amphibians and reptiles: Natural history and life history attributes framing chemical exposure in the field Physiological ecology of amphibians and reptiles: Natural history and life history attributes framing chemical exposure in the field
No abstract available.
Authors
Greg Linder, B. Palmer, Edward E. Little, Christopher L. Rowe, Paula F. P. Henry
Coral calcification in a changing ocean Coral calcification in a changing ocean
Animals and plants that live in the ocean form skeletons and other hard parts by combining calcium ions and carbonate ions to create calcium carbonate. This process is called calcification. In tropical and subtropical oceans, the calcification of corals and other organisms creates reefs that protect islands, produce beautiful white-sand beaches, and create habitat for thousands of...
Authors
Ilsa B. Kuffner
How does a U.S. Geological Survey streamgage work? How does a U.S. Geological Survey streamgage work?
Information on the flow of rivers and streams is a vital national asset that safeguards lives, protects property, and ensures adequate water supplies for the future. The U.S. Geological Survey (USGS) operates a network of more than 9,000 streamgages nationwide with more than 500 in Texas.
Authors
Dee L. Lurry