Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 9967
Selenium and other elements in juvenile striped bass from the San Joaquin Valley and San Francisco Estuary, California
Concentrations of selenium and other trace elements were determined in 55 whole body samples of juvenile anadromous striped bass (Morone saxatilis) from the San Joaquin Valley and San Francisco Estuary, California. The fish (≤1 yr old—the predominant life stage in the San Joaquin Valley) were collected in September–December 1986 from 19 sites in the Valley and 3 sites in the Estuary, and analyzed
Authors
Michael K. Saiki, Donald U. Palawski
Variations in suspended sediment and associated trace element concentrations in selected riverine cross sections
Detailed sampling and subsequent analyses of riverine suspended sediment obtained from six rivers in the United States indicate substantial differences in suspended sediment concentrations and possibly in some associated trace elements, depending on whether depth- and width-integrated, point, or pumping samples are used. In addition, the data from time-series, depth-integrated sampling indicate th
Authors
Arthur J. Horowitz, Frank A. Rinella, Paul J. Lamothe, Timothy L. Miller, Thomas K. Edwards, Richard L. Roche, David A. Rickert
Field trip guide - American Water Resources Association
No abstract available.
Authors
Matthew C. Larsen, Thalia D. Veve
Development of an aquifer management model AQMAN3D
A computer code that enables the use of the USGS Modular groundwater flow model for aquifermanagement modeling has been developed. Aquifermanagement techniques integrate groundwater flow modeling with linear quadratic optimization methods for the solution of various aquifer management problems. The model AQMAN3D, is a modified version of a previously developed two-dimensional AQMAN model. The idea
Authors
Juan Carlos Puig, L. I. Rolon-Collazo, Ishmael Pagan-Trinidad
Landslide processes in saprolitic soils of a tropical rain forest, Puerto Rico
Shallow soil slips, earth and debris slides appear to be a primary mechanism of hillslope denudation in the rainforest of eastern Puerto Rico. Annual rainfall in excess of 4,000 mm, and thick sequences (up to 20 m) of residual soils (saprolite) combine to produce these landslides. Shear strength testing and observatons of tension cracks indicate that landslides may start as tensile failure of sapr
Authors
Matthew C. Larsen, Andrew Simon
Rainfall-soil moisture relations in landslide-prone areas of a tropical rain forest, Puerto Rico
Soil moisture conditions are not well documented in steep, tropical landslide-prone terrain. In the 11,330 ha Caribbean National Forest (CNF) in northeastern Puerto Rico more than 170 landslides that occurred from one to approximately 60 years ago have been mapped. Most of these landslides are shallow, with failure depths of 0.5 ot 7 m, and are associated with periods of intense, prolonged rainfal
Authors
Matthew C. Larsen, Angel J. Torres-Sanchez
Hydrochemistry of the South Coastal Plain Aquifer System of Puerto Rico and its relation to surface-water recharge
No abstract available.
Authors
Fernando Gomez-Gomez
Behavioral indicators of sublethal toxicity in rainbow trout
Four measures of behavior-spontaneous swimming activity, swimming capacity, feeding behavior, and vulnerability to predation-were assessed as indicators of sublethal toxicity in rainbow trout (Oncorhynchus mykiss) in 96-hr exposures to sublethal concentrations of six agricultural chemicals: carbaryl, chlordane, dimethylamine salt of 2,4-dichlorophenoxyacetic acid (2,4-DMA), tributyl phosphorotrith
Authors
Edward E. Little, Richard D. Archeski, Boris A. Flerov, Vera I. Kozlovskaya
Colorimetric and refractometer estimates of total plasma protein in striped bass, Morone saxatilis (Walbaum)
No abstract available.
Authors
J. B. Hunn, I.E. Greer
Eocene-Oligocene sea-level changes on the New Jersey coastal plain linked to the deep-sea record
We use magnetostratigraphy and Sr-isotope stratigraphy to improve stratigraphic control for the Eocene to Oligocene of the New Jersey coastal plain (ACGS4 borehole). Magnetostratigraphy in many cases is complicated in outcrop sections of shallow-water (<200 m paleodepth) sediments by low remanence and weathering; we minimize these problems by analyzing large samples obtained from the ACGS4 borehol
Authors
Kenneth G. Miller, Dennis V. Kent, Andrew N. Brower, Laurel M. Bybell, Mark D. Feigenson, Richard K. Olsson, Richard Z. Poore
A computer program for GEOphysical log data MANagement and plotting (GEOMAN)
No abstract available.
Authors
I. E. Arroyo, Sigfredo Torres-Gonzalez, Ramon A. Carrasquillo