Tritium and plutonium in waters from the Bering and Chukchi Seas
E. R. Landa, D. M. Beals, J.E. Halverson, R. L. Michel, G.R. Cefus
1999, Health Physics (77) 668-676
During the summer of 1993, seawater in the Bering and Chukchi Seas was sampled on a joint Russian-American cruise [BERPAC] of the RV Okean to determine concentrations of tritium, 239Pu and 240Pu. Concentrations of tritium were determined by electrolytic enrichment and liquid scintilation counting. Tritium levels ranged up to 420...
Estimation of methanogen biomass via quantitation of coenzyme M
Dwayne A. Elias, Lee R. Krumholz, Ralph S. Tanner, Joseph M. Suflita
1999, Applied and Environmental Microbiology (65) 5541-5545
Determination of the role of methanogenic bacteria in an anaerobic ecosystem often requires quantitation of the organisms. Because of the extreme oxygen sensitivity of these organisms and the inherent limitations of cultural techniques, an accurate biomass value is very difficult to obtain. We standardized a simple method for estimating methanogen...
Revised shaded relief map and controlled color photomosaic of the Mare Australe region (MC-30) of Mars
D.D. Hirsch, D.A. Casebier
1999, IMAP 2571
Patch to landscape patterns in post fire recruitment of a serotinous conifer
Gidi Ne’eman, C. J. Fotheringham, Jon E. Keeley
1999, Plant Ecology (145) 235-242
Obligate seeding species are highly specialized to fire disturbance and many conifers such as cypress, which are adapted to high intensity stand-replacing fires, have canopy seed banks stored in serotinous cones. Resilience of these trees to fire disturbance is a function of disturbance frequency and one focus of this study...
Bathymetric survey and physical and chemical-related properties of Kincaid Reservoir, Louisiana, June and September 1997
Paul A. Ensminger
1999, Water-Resources Investigations Report 99-4194
No abstract available....
Time-series photographs of the sea floor in western Massachusetts Bay: June - October, 1996
Bradford Butman, John Evans, William Lange, Chris F. Polloni
1999, Open-File Report 98-797
No abstract available....
Molecular and immunogenetic analysis of major histocompatibility haplotypes in northern bobwhite enable direct identification of corresponding haplotypes in an endangered subspecies, the masked bobwhite
B. M. Drake, R.M. Goto, M.M. Miller, G.F. Gee, W.E. Briles
1999, Zoo Biology (18) 279-294
The major histocompatibility complex (MHC) is a group of genetic loci coding for haplotypes that have been associated with fitness traits in mammals and birds. Such associations suggest that MHC diversity may be an indicator of overall genetic fitness of endangered or threatened species. The MHC haplotypes...
Terrestrial predator alarm vocalizations are a valid monitor of stress in captive brown capuchins (Cebus apella)
S. Boinski, T. S. Gross, J.K. Davis
1999, Zoo Biology (18) 295-312
The vocal behavior of captive animals is increasingly exploited as an index of well-being. Here we show that the terrestrial predator alarm (TPA) vocalization, a robust and acoustically distinctive anti-predation vocal response present in many mammal and bird species, offers useful information on the relative well-being and...
A weighted least-squares approach to temporal NDVI smoothing
D. Swets, Bradley C. Reed, James Rowland, S.E. Marko
1999, Conference Paper
Satellite imagery provides a unique vantage point for observing seasonal dynamics of the landscape that have implications for global change issues. An objective evaluation of surface conditions may be performed using the normalized difference vegetation index (NDVI) derived from National Oceanic and Atmospheric Administration advanced very high resolution radiometer data....
Efficacy of identifying stocked crappies in a Tennessee reservoir through oxytetracycline marking
Daniel A. Isermann, Phillip William Bettoli, Steven M. Sammons
1999, North American Journal of Fisheries Management (19) 1122-1123
Oxytetracycline (OTC) immersion was used to identify black-nosed crappies, a morphological variation of black crappie Pomoxis nigromaculatus, stocked into Normandy Reservoir, Tennessee, during fall 1997. The technique effectively marked 97% of the treated fish. Analysis of one otolith per fish by one reader successfully identified 98% of marked and unmarked...
Comparison of water quality in four small watersheds containing animal feeding operations in Iowa
Kent Becher, Kimberlee K.B. Akers
1999, Conference Paper, Workshop Abstracts of conference
No abstract available....
Nutrients, pesticides, and pesticide metabolites discharged to the Mississippi River from Eastern Iowa Watersheds
D.J. Schnoebelen, Kent Becher
1999, Conference Paper
No abstract available....
Finding minimal concentrations of herbicides in ground water? Try looking for the degradates
D.W. Kolpin, E.M. Thurman, S. M. Linhart
1999, Book chapter, Contamination of Hydrologic Systems and Related Ecosystems: USGS WRIR 99-4018B
No abstract available....
Occurrence of acetochlor and acetochlor metabolites in alluvial aquifers in Iowa
Stephen J. Kalkhoff, Mark E. Savoca, Eric M. Sadorf, Dana W. Kolpin, Earl M. Thurman
1999, Conference Paper
No abstract available....
Occurrence and distribution of chloroacetanilide and triazine pesticide metabolites in streams in eastern Iowa
Stephen J. Kalkhoff, E.M. Thurman
1999, Conference Paper
No abstract available....
Water chemistry in a nutrient and sediment control system near Owasco, New York
Stephen C. Komor
1999, Water Resources Impact (1) 19-21
Carbon cycling in boreal wetlands: A comparison of three approaches
Susan E. Trumbore, Jill Bubier, Jennifer W. Harden, Patrick M. Crill
1999, Journal of Geophysical Research - Atmospheres (104) 27673-27682
Three independent methods were used to measure net ecosystem production (NEP) in four wetlands near Thompson, Manitoba, Canada. The first method calculated NEP by subtracting heterotrophic respiration from net primary productivity, using both measurements and estimates derived from the literature. The second method used radiocarbon data from cores to derive...
Metallogeny of the northeastern Pacific Rim: an example of the distribution of ore deposits along a growing continental margin
R.J. Goldfarb, C.J. Hart, J.K. Mortensen
Graeme Weber, editor(s)
1999, Book, PACRIM '99 Congress: 10-13 October 1999, Bali, Indonesia (The Australasian Institute of Mining and Metallurgy Publication Series no. 99/4)
The distribution of mineral deposits within northwestern North America (Alaska, Yukon, and northern British Columbia) allows for an in-depth examination of the metallogenic patterns of a growing continental margin. A more complete understanding of the tectonic evolution of this part of the Pacific Rim, achieved over the last 15 to...
Winter ecology of the endangered golden-cheeked warbler
John H. Rappole, David I. King, Wylie C. Barrow Jr.
1999, The Condor (101) 762-770
We studied the ecology of the Golden-cheeked Warbler (Dendroica chrysoparia) during three winter seasons, 1995-1998, in Honduras, Guatemala, and Mexico. Individuals of this species occurred almost exclusively as members of mixed-species flocks, occupying sites with greater densities of encino oak and ground cover and fewer pines than random sites. Most...
Response
C. Edward Proffitt, Donna Devlin, Shannon May Bros
1999, Ecological Applications (9) 1492-1496
No abstract available....
An assessment of seismic monitoring in the United States; requirement for an Advanced National Seismic System
Water Resources Division, U.S. Geological Survey
1999, Circular 1188
This report assesses the status, needs, and associated costs of seismic monitoring in the United States. It sets down the requirement for an effective, national seismic monitoring strategy and an advanced system linking national, regional, and urban monitoring networks. Modernized seismic monitoring can provide alerts of imminent strong earthquake shaking;...
Physical stratigraphy, paleontology, and magnetostratigraphy of the USGS-Santee Coastal Reserve core (CHN-803), Charleston County, South Carolina
Lucy E. Edwards, G. S. Gohn, Self-Trail J.M., D.C. Prowell, L.M. Bybell, L. P. Bardot, J. V. Firth, B.T. Huber, N. O. Frederiksen, K.G. MacLeod
1999, Open-File Report 99-308-A
The Santee Coastal Reserve core, a 545-ft-deep corehole in northeastern Charleston County, South Carolina, recovered sediments of Late Cretaceous, Paleocene, Eocene, and Quaternary age. The deepest sediments, the Donoho Creek Formation (545-475.7 ft), consist of 69.3 ft of muddy calcareous sand of marine origin. This formation is placed within the...
Status and distribution of the angonoka tortoise (Geochelone yniphora) of western Madagascar
Lora L. Smith, Don Reid, Bourou Robert, Mahatoly Joby, Sibo Clement
1999, Biological Conservation (91) 23-33
From 1993 to 1995, field surveys were conducted in western Madagascar to assess the current status of the angonoka tortoise (Geochelone yniphora) in the wild. Tortoise presence was documented at 10 of 11 localities surveyed. These localities represent at least five populations, all within a 30-km radius of Baly Bay,...
Restoration of bighorn sheep metapopulations in and near 15 national parks: Conservation of severely fragmented species; Volume II, Synopsis of research findings
Francis J. Singer, Michelle A. Gudorf
1999, Open-File Report 99-105
In 1991, the National Park Service (NPS) initiated a series of research studies to support an effort to restore bighorn sheep (Ovis canadensis) into 15 national parks in the Intennountain West and Colorado Plateau areas (Fig. 1). The Biological Resources Division of the U.S. Geological Survey provided scientific advice and...
Physical stratigraphy, paleontology, and magnetostratigraphy of the USGS-Santee Coastal Reserve core (CHN-803), Charleston County, South Carolina
Lucy E. Edwards, G. S. Gohn, Self-Trail J.M., D.C. Prowell, L.M. Bybell, L. P. Bardot, J. V. Firth, B.T. Huber, N. O. Frederiksen, K.G. MacLeod
1999, Open-File Report 99-308-B
The Santee Coastal Reserve core, a 545-ft-deep corehole in northeastern Charleston County, South Carolina, recovered sediments of Late Cretaceous, Paleocene, Eocene, and Quaternary age. The deepest sediments, the Donoho Creek Formation (545-475.7 ft), consist of 69.3 ft of muddy calcareous sand of marine origin. This formation is placed within the...
