Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 9969
Landslides triggered by Hurricane Hugo in eastern Puerto Rico, September 1989
On the morning of September 18, 1989, a category-four hurricane struck eastern Puerto Rico with a sustained wind speed in excess of 46 m/s. The 24-h rainfall accumulation from the hurricane ranged from 100 to 339 mm. Average rainfall intensities ranging from 34 to 39 mm/h were calculated for 4 and 6 h periods, respectively, at a rain gage equipped with satellite telemetry, and at an observer stati
Authors
Matthew C. Larsen, Angel J. Torres-Sanchez
Aluminum in soil solutions from a subalpine spruce-fir forest at Whiteface Mountain, New York
Direct or indirect Al toxicity has been suggested as a principal factor in forest tree declines. We monitored ambient soil solutions in undisturbed and experimentally manipulated soils from a fir [Abies balsamea (L.) Mill.]-spruce forest on Whiteface Mountain, NY, in order to characterize soil solution Al concentrations over a range of acid anion loadings. Under both natural and experimental condi
Authors
E. K. Miller, Thomas G. Huntington, A. H. Johnson, A. J. Friedland
Genetic variation in male Yellow-headed Blackbirds from the northern Great Plains
Electrophoretic differences at 15 presumptive loci were used to assess allelic frequencies, heterozygosities, and polymorphism for male Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected in east-central Alberta, north-central North Dakota, and east-central South Dakota. Five loci were polymorphic and mean heterozygosities ranged from 0.119 to 0.133. Significant differences were det
Authors
Daniel J. Twedt, William J. Bleier, George M. Linz
Comparison of algorithms for replacing missing data in discriminant analysis
We examined the impact of different methods for replacing missing data in discriminant analyses conducted on randomly generated samples from multivariate normal and non-normal distributions. The probabilities of correct classification were obtained for these discriminant analyses before and after randomly deleting data as well as after deleted data were replaced using: (1) variable means, (2) prin
Authors
Daniel J. Twedt, D.S. Gill
Investigations into the effects of PCB congeners on reproduction in lake trout from the Great Lakes
Eggs of feral lake trout collected in Lake Michigan were reared under laboratory conditions and monitored for egg hatchability, physical abnormalities, and survival of fry. Subsamples of eggs were also analyzed for PCB congeners. A negative correlation was found between egg hatchability and total PCBs but expressing PCB dose as dioxin equivalents did not produce as strong a correlation. No other m
Authors
Michael J. Mac, T.R. Schwartz
Interim report of the technical workshop on manatee population biology. Manatee Population Research Report No. 10
Abstract not supplied at this time
Authors
T. J. O'Shea, B.B. Ackerman
Food preferences of spring-migrating blue-winged teal in southwestern Louisiana
We studied effects of pair status, molt intensity, and year on food selection by migrating male blue-winged teal (Anas discors) in southwestern Louisiana during springs 1990 and 1991. Diets consisted primarily of animal foods; but plant material, consisting mostly of seeds, comprised as much as 44%. There was no difference in animal food consumption by paired and unpaired males; however, the propo
Authors
Scott W. Manley, W.L. Hohman, J.L. Moore, David Richard
Knowledge-based GIS: An expert system approach for managing wetlands
No abstract available
Authors
Wei Ji, James B. Johnston, Marcia McNiff, Loyd C. Mitchell
Toxicity of agricultural subsurface drainwater from the San Joaquin Valley, California to juvenile chinook salmon and striped bass
Juvenile chinook salmon Oncorhynchus tshawytscha (40-50 mm total length, TL) and striped bass Morone saxatilis (30-40 mm TL) were exposed to serial dilutions (100, 50, 25, and 12.5%) of agricultural subsurface drainwater (WWD), reconstituted drainwater (RWWD), and reconstituted seawater (IO). Agricultural subsurface drainwater contained naturally elevated concentrations of major ions (such as sodi
Authors
Michael K. Saiki, Mark R. Jennings, Raymond H. Wiedmeyer
Toxicity of trace element and salinity mixtures to striped bass (Morone saxatilis) and Daphnia magna
Acute toxicity tests with reconstituted water were conducted to investigate the relationship between water hardness, salinity, and a mixture of trace elements found in irrigation drain waters entering Stillwater Wildlife Management Area (SWMA), near Fallon, Nevada. The SWMA has been the site of many fish kills in recent years, and previous toxicity studies indicated that one drain water, Pintail B
Authors
F.J. Dwyer, S.A. Burch, C.G. Ingersoll, J. B. Hunn
Use of semipermeable membrane devices for in situ monitoring of polycyclic aromatic hydrocarbons in aquatic environments
A method is given for the recovery, cleanup, and analysis of polycyclic aromatic hydrocarbons (PAHs) that have been sequestered in SPMDs (semipermeable membrane devices). SPMDs are polymeric membranes enclosing lipids, and mimic the bioconcentration process of aquatic animals. SPMDs are used as passive, in situ monitors of contamination by organic pollutants of aquatic environments. The method rep
Authors
Jon A. Lebo, James L. Zajicek, James N. Huckins, Jimmie D. Petty, Paul H. Peterman