Reconstructing the spatial pattern of trees from routine stand examination measurements
M.L. Hanus, D.W. Hann, D.D. Marshall
1998, Forest Science (44) 125-133
Reconstruction of the spatial pattern of trees is important for the accurate visual display of unmapped stands. The proposed process for generating the spatial pattern is a nonsimple sequential inhibition process, with the inhibition zone proportionate to the scaled maximum crown width of an open-grown tree of the same species...
Determination of phylogenetic relationships of Flavobacterinium psychrophilum (Flexibacterin psychrophilus), Flavobacterinium columnare (Flexibacterin columnaris), and Flexibacterin maritimus by sequence analysis of 16S ribosomal RNA genes amplified by polymerase chain reaction
J.A. Bader, E. B. Shotts Jr.
1998, Journal of Aquatic Animal Health (10) 320-327
The nearly complete small subunit 16S ribosomal RNA (rRNA) gene sequence amplified by polymerase chain reaction was determined for Flavobacterium psychrophilum (formerly Flexibacter psychrophilus) by using automated nucleotide sequencing. The sequence was found to be 1,465 base pairs (bp) in length, a size consistent with previously determined sequences for...
Variability of Secchi disk readings in an exceptionally clear and deep caldera lake
Gary L. Larson, M.W. Buktenica
1998, Archiv fur Hydrobiologie (141) 377-388
SUMMARY: The Peromyscus leucopus on a 17-acre study area were live-trapped, marked, and released over a seven-day period. On the three following nights intensive snap-trapping was done on the central acre of the study plot. The animals caught by snap traps in...
Spatial patterns of tropospheric ozone in the Mount Rainier region of the Cascade Mountains, USA
S. Brace, D. L. Peterson
1998, Atmospheric Environment (32) 3629-3637
Few data exist on tropospheric ozone concentrations in rural and wildland areas of western Washington, U.S.A. We measured tropospheric ozone in Mount Rainier National Park and the Puget Sound region of Washington using electronic analyzers and passive samplers during the summers of 1994 and 1995. Electronic analyzers recorded hourly ozone...
Long term trends liver neoplasm epizootics of brown bullhead in the Black River, Ohio
P. C. Baumann, J.C. Harshbarger
1998, Environmental Monitoring and Assessment (53) 213-223
Since 1980, liver neoplasms in brown bullhead and polynuclear aromatic hydrocarbons (PAH) in sediment have been researched in a series of studies on the Black River in Lorain, Ohio. In the early 1980s the liver cancer prevalence in fish of age 3 and older was high, ranging from 22% to...
Pathology of diseases in wild desert tortoises from California
B.L. Homer, K.H. Berry, Mary E. Brown, G. Ellis, E.R. Jacobson
1998, Journal of Wildlife Diseases (34) 508-523
Twenty-four ill or dead desert tortoises (Gopherus agassizii) were received between March 1992 and July 1995 for necropsies from the Mojave and Colorado deserts of California (USA). Diseases observed in these animals included cutaneous dyskeratosis (n = 7); shell necrosis (n = 2); respiratory diseases...
Landsat 7 science data users handbook
Water Resources Division, U.S. Geological Survey
1998, Report
Estimates of brown bear abundance on Kodiak Island, Alaska
V.G. Barnes Jr., R. B. Smith
1998, Ursus (10) 1-9
During 1987-94 we used capture-mark-resight (CMR) methodology and rates of observation (bears/hour and bears/100 km2) of unmarked brown bears (Ursus arctos middendorffi) during intensive aerial surveys (IAS) to estimate abundance of brown bears on Kodiak Island and to establish a baseline for monitoring population trends. CMR estimates were obtained on 3 study areas; density ranged...
A female black bear denning habitat model using a geographic information system
J. D. Clark, S.G. Hayes, J.M. Pledger
1998, Ursus (10) 181-185
We used the Mahalanobis distance statistic and a raster geographic information system (GIS) to model potential black bear (Ursus americanus) denning habitat in the Ouachita Mountains of Arkansas. The Mahalanobis distance statistic was used to represent the standard squared distance between sample variates in the GIS database (forest cover type,...
Classifying coastal resources by integrating optical and radar imagery and color infrared photography
Elijah W. Ramsey III, Gene A. Nelson, Sijan Sapkota
1998, Mangroves and Salt Marshes (2) 109-119
A progressive classification of a marsh and forest system using Landsat Thematic Mapper (TM), color infrared (CIR) photograph, and ERS-1 synthetic aperture radar (SAR) data improved classification accuracy when compared to classification using solely TM reflective band data. The classification resulted in a detailed identification of differences within a nearly...
Wetland connectivity and waterbird conservation in the western Great Basin of the United States: Introduction to workshop
Susan M. Haig, Lewis W. Oring
1998, Wader Study Group Bulletin (85) 19-20
As scientists, managers and landowners, we have come to realize that to best understand the local and regional value of individual wetlands, we need to take a broad geographic, taxonomic, and management view. In December 1994, a symposium was held in Reno, Nevada that addressed this topic for shorebirds by...
Photosynthesis of the cyanobacterial soil-crust lichen Collema tenax from arid lands in southern Utah, USA: Role of water content on light and temperature responses of CO2 exchange
Otto L. Lange, Jayne Belnap, H. Reichenberger
1998, Functional Ecology (12) 195-202
1. The gelatinous cyanobacterial Collema tenax is a dominant lichen of biotic soil crusts in the western United States. In laboratory experiments, we studied CO2 exchange of this species as dependent on water content (WC), light and temperature. Results are compared with performance of green-algal lichens of the same site...
Estimating maize production in Kenya using NDVI: Some statistical considerations
J.E. Lewis, James Rowland, A. Nadeau
1998, International Journal of Remote Sensing (19) 2609-2617
A regression model approach using a normalized difference vegetation index (NDVI) has the potential for estimating crop production in East Africa. However, before production estimation can become a reality, the underlying model assumptions and statistical nature of the sample data (NDVI and crop production) must be examined rigorously. Annual maize...
The Inter-American Geospatial Data Network— developing a Western Hemisphere geospatial data clearinghouse
Michelle L. Anthony, Jacqueline M. Klaver, Robert Quenzer
1998, Report, IAHS-AISH Publication, no. 253
The US Geological Survey and US Agency for International Development are enhancing the geographic information infrastructure of the Western Hemisphere by establishing the Inter-American Geospatial Data Network (IGDN). In its efforts to strengthen the Western Hemisphere's information infrastructure, the IGDN is consistent with the goals of the Plan of Action...
Satellite radar interferometry measures deformation at Okmok Volcano
Zhong Lu, Dorte Mann, Jeff Freymueller
1998, Eos, Transactions, American Geophysical Union (79) 461-468
The center of the Okmok caldera in Alaska subsided 140 cm as a result of its February– April 1997 eruption, according to satellite data from ERS-1 and ERS-2 synthetic aperture radar (SAR) interferometry. The inferred deflationary source was located 2.7 km beneath the approximate center of the caldera using a...
North American landscape characterization project: The production of a continental scale three-decade Landsat data set
Terry L. Sohl, John L. Dwyer
1998, Geocarto International (13) 43-51
The North American Landscape Characterization (NALC) project is a component of the National Aeronautics and Space Administration (NASA) Landsat Pathfinder program. Pathfinder projects are focused on the investigation of global change utilizing current remote sensing technologies. The NALC project is a cooperative effort between the U. S. Environmental Protection Agency...
Cultural resource applications for a GIS: Stone conservation at Jefferson and Lincoln Memorials
Kyle Joly, Tony Donald, Douglas Comer
1998, Cultural Resources Management (21) 17-18
Geographical information systems are rapidly becoming essential tools for land management. They provide a way to link landscape features to the wide variety of information that managers must consider when formulating plans for a site, designing site improvement and restoration projects, determining maintenance projects and protocols, and even interpreting the...
Regional land cover characterization using Landsat thematic mapper data and ancillary data sources
James E. Vogelmann, Terry L. Sohl, P.V. Campbell, D.M. Shaw
Veith G., editor(s)
1998, Environmental Monitoring and Assessment (51) 415-428
As part of the activities of the Multi-Resolution Land Characteristics (MRLC) Interagency Consortium, an intermediate-scale land cover data set is being generated for the conterminous United States. This effort is being conducted on a region-by-region basis using U.S. Standard Federal Regions. To date, land cover data sets have been...
The lizard fauna of Guam's fringing islets: Island biogeography, phylogenetic history, and conservation implications
G. Perry, G.H. Rodda, T. H. Fritts, T.R. Sharp
1998, Global Ecology and Biogeography Letters (7) 353-365
We sampled the lizard fauna of twenty-two small islets fringing the Pacific island of Guam and used these data to shed light on the processes responsible for present-day diversity. Habitat diversity, measured by islet area and vegetation complexity, was significantly correlated with the number of species found on an islet....
Real-time monitoring of bluff stability at Woodway, Washington, USA
R.L. Baum, E. L. Harp, W.J. Likos, P. S. Powers, R.G. LaHusen
Evangelista A.Picarelli L.Evangelista A.Picarelli L., editor(s)
1998, Conference Paper, The geotechnics of hard soils - soft rocks. Proceedings of the second international symopsium on hard soils-soft rocks, Naples, October 1998. (Two volumes).
On January 15, 1997, a landslide of approximately 100,000-m3 from a coastal bluff swept five cars of a freight train into Puget Sound at Woodway, Washington, USA, 25 km north of downtown Seattle. The landslide resulted from failure of a sequence of dense sands and hard silts of glacial and...
Geohydrologic unit boundaries along the Colorado Front Range
Sharon Rafferty
1998, Report
This digital geospatial data set consists of geohydrologic unit boundaries shown in the report "Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado" (Robson and others, 1998)....
Superfund GIS - Aquifer Diffusivity in Tennessee.
D.C. Greene, W.J. Wolfe
1998, Report
This dataset represents aquifer diffusivity based on the streamflow-recession index areas from Bingham (1986)....
Point and line geologic structure information in "Structure, outcrop, and subcrop of the geologic structure information for the Arapahoe and Laramie-Fox Hills aquifers."
Sharon Rafferty
1998, Report
This digital geospatial data set consists of points and lines representing symbolization of geologic structure information for the Arapahoe and Laramie-Fox Hills aquifers. The symbols were developed as part of the report in "Structure, Outcrop, and Subcrop of the Bedrock Aquifers Along the Western Margin of the Denver Basin,...
Structure contours of base of Laramie-Fox Hills and Arapahoe aquifers
Sharon Rafferty
1998, Report
This digital geospatial data set consists of structure contours of the base of the Laramie-Fox Hills aquifer and the base of the Arapahoe aquifer along the Front Range of Colorado. The U.S. Geological Survey developed this data set as part of a project described in the report, "Structure, Outcrop,...
County-based estimates of nitrogen and phosphorus content of animal manure in the United States for 1982, 1987, and 1992
Larry Puckett, Kerie Hitt, Richard Alexander
1998, Report
This data set contains county estimates of nitrogen and phosphorus content of animal wastes produced annually for the years 1982, 1987, and 1992. The estimates are based on animal populations for those years from the 1992 Census of Agriculture (U.S. Bureau of the Census, 1995) and methods for estimating the...
