Comment on “Field study of spatial variability in unsaturated flow beneath and adjacent to playas” by Bridget R. Scanlon and Richard S. Goldsmith
Warren W. Wood
1999, Water Resources Research (35) 601-601
The Scanlon and Goldsmith [1997] paper contains a wealth of data that provides a useful contribution to the understanding of...
Vegetative resistance to flow in South Florida: Summary of vegetation sampling at sites NESRS3 and P33, Shark River Slough, April 1996
Virginia Carter, Henry A. Ruhl, Nancy B. Rybicki, Justin T. Reel, Patricia T. Gammon
1999, Open-File Report 99-187
The U.S. Geological Survey is one of many agencies participating in the effort to restore the south Florida Everglades. We are sampling and characterizing the vegetation at selected sites in the Everglades as part of a study to quantify vegetative flow resistance. The objectives of the vegetative sampling are (1)...
Vegetative resistance to flow in south Florida: Summary of vegetation sampling at sites NESRS3 and P33, Shark River Slough, November, 1996
Virginia Carter, Justin T. Reel, Nancy B. Rybicki, Henry A. Ruhl, Patricia T. Gammon, Jonathan K. Lee
1999, Open-File Report 99-218
The U.S. Geological Survey is one of many agencies participating in the effort to restore the South Florida Everglades. We are sampling and characterizing the vegetation at selected sites in the Everglades as part of a study to quantify vegetative flow resistance. The objectives of the vegetation sampling are (1)...
Results of time-domain electromagnetic soundings in Everglades National Park, Florida
D.V. Fitterman, Maria Deszcz-Pan, C.E. Stoddard
1999, Open-File Report 99-426
This report describes the collection, processing, and interpretation of time-domain electromagnetic soundings from Everglades National Park. The results are used to locate the extent of seawater intrusion in the Biscayne aquifer and to map the base of the Biscayne aquifer in regions where well coverage is sparse. The data show...
Hydrogeologic structure of the Newark Basin, Pennsylvania, from borehole geophysical logs
R. H. Morin, L.A. Senior, E.R. Decker
B. Amadei, R.L. Kranz, G.A. Scott, P.H. Smeallie, editor(s)
1999, Book chapter, Rock Mechanics for Industry--Proceedings of the 37th U.S. Rock Mechanics Symposium
The Brunswick and the underlying Lockatong Formations are comprised of littrifled Mesozoic sediments that constitute part of the Newark Basin in southeastern Pennsylvania (USA). These fractured rocks form an important regional aquifer that consists of gmdational sequences of shale, siltstone, and sandstone, with fluid transport occurring primarily in fractures. An...
Radiotracking large wilderness mammals: Integration of GPS and Argos technology
Charles C. Schwartz, Steve M. Arthur
1999, Ursus (11) 261-274
We tested 30 prototype global positioning system (GPS) radiocollars on brown bears (Ursus arctos) over a 3-year period on the Kenai Peninsula, Alaska. Collars were of 2 design types: GPS with an Argos (Argos Data collection and Location System) satellite uplink (n=19) and GPS unites where the data were stored...
Ground-water flow paths and traveltime to three small embayments within the Peconic Estuary, eastern Suffolk County, New York
Christopher Schubert
1999, Water-Resources Investigations Report 98-4181
The Peconic Estuary, at the eastern end of Long Island, has been plagued by a recurrent algal bloom that has caused the severe decline of local marine resources. Although the onset, duration, and cessation of the bloom remain unpredictable, ground-water discharge has been shown to affect surface-water quality in the...
USGS develops a drainage-based system to track ANS introductions
Pamela L. Fuller
1999, Aquatic Nuisance Species Digest (3) 32-35
The U.S. Geological Survey (USGS) Nonindigenous Aquatic Species (NAS) Program has tracked the distribution of introduced species for more than 20 years. This effort began with foreign fishes in Florida and later expanded to include aquatic nuisance species nationwide. The tracking database contains locational and temporal data for introductions and...
GIS database development to analyze fire history in southern Arizona and beyond: an example from Saguaro National Park
P.J. Swantek, W. L. Halvorson, C.R. Schwalbe
1999, Technical Report 61
No abstract available at this time...
Extirpation and recolonization in a metapopulation of an endangered fish, the tidewater goby
K. D. Lafferty, C. C. Swift, R.F. Ambrose
1999, Conservation Biology (13) 1447-1453
The tidewater goby ( Eucyclogobius newberryi ), an endangered species in the United States, occurs in a series of isolated coastal wetlands in California. Using historical presence-absence data and our own surveys, we estimated annual rates of extirpation and recolonization for several populations of the goby in southern California. As predicted, large...
Population demographics and genetic diversity in remnant and translocated populations of sea otters
James L. Bodkin, Brenda E. Ballachey, M. A. Cronin, K.T. Scribner
1999, Conservation Biology (13) 1378-1385
The effects of small population size on genetic diversity and subsequent population recovery are theoretically predicted, but few empirical data are available to describe those relations. We use data from four remnant and three translocated sea otter ( Enhydra lutris) populations to examine relations among magnitude and duration of minimum population...
Reproductive characteristics of migratory golden eagles in Denali National Park, Alaska
Carol L. McIntyre, Layne G. Adams
1999, The Condor (101) 115-123
We describe reproductive characteristics of Golden Eagles (Aquila chrysaetos) breeding in Denali National Park, Alaska during an entire snowshoe hare (Lepus americanus) cycle, 1988-1997. Data on nesting eagles were collected at 58 to 72 nesting areas annually using two aerial surveys. Surveys were conducted during the incubation period to determine...
Water-use patterns of woody species in pineland and hammock communities of South Florida
Sharon M. Ewe, Leonel S. Sternberg, David E. Busch
1999, Forest Ecology and Management (118) 139-148
Rockland pine forests of south Florida dominated by Pinus elliottii var. densa characteristically have poor soil development in relation to neighboring hardwood hammocks. This has led to the hypothesis that Everglades hammock trees are more reliant on soil moisture derived from local precipitation whereas pineland plants must depend more on...
Detecting long-term hydrological patterns at Crater Lake, Oregon
D. L. Peterson, D.G. Silsbee, Kelly T. Redmond
1999, Northwest Science (73) 121-130
Tree-ring chronologies for mountain hemlock (Tsuga mertensiana) were used to reconstruct the water level of Crater Lake, a high-elevation lake in the southern Cascade Range of Oregon. Reconstructions indicate that lake level since the late 1980s has been lower than at any point in the last 300 years except the early 1930s...
Exotic plant species invade hot spots of native plant diversity
T.J. Stohlgren, Dan Binkley, G.W. Chong, M. A. Kalkhan, L. D. Schell, K.A. Bull, Yuka Otsuki, G. Newman, Michael A. Bashkin, Y. Son
1999, Ecological Monographs (69) 25-46
Some theories and experimental studies suggest that areas of low plant species richness may be invaded more easily than areas of high plant species richness. We gathered nested-scale vegetation data on plant species richness, foliar cover, and frequency from 200 1-m2 subplots (20 1000-m2 modified-Whittaker plots) in the Colorado Rockies...
Clinal variation in the juvenal plumage of American kestrels
J.A. Smallwood, C. Natale, K. Steenhof, M. Meetz, C.D. Marti, R.J. Melvin, G.R. Bortolotti, R. Robertson, S. Robertson, W.R. Shuford, S.A. Lindemann, B. Tornwall
1999, Journal of Field Ornithology (70) 425-435
The American Kestrel(Falco sparverius) is a sexually dichromatic falcon that exhibits considerable individual plumage variability. For example, the anterior extent of the black dorsal barring in juvenile males has been used throughout North America as one of several aging criteria, but recent data demonstrate that the variability among individual Southeastern American Kestrels(E S. paulus)exceeds...
Temporal and spatial variability in thalweg profiles of a gravel-bed river
Mary Ann Madej
1999, Earth Surface Processes and Landforms (24) 1153-1169
This study used successive longitudinal thalweg profiles in gravel-bed rivers to monitor changes in bed topography following floods and associated large sediment inputs. Variations in channel bed elevations, distributions of residual water depths, percentage of channel length occupied by riffles, and a spatial autocorrelation coefficient (Moran's I) were used to...
Euthanasia
J. C. Franson
1999, Information and Technology Report 1999-0001
Euthanasia means to cause humane death. Some current euthanasia techniques may become unacceptable over time and be replaced by new techniques as more data are gathered and evaluated. The following information and recommendations are based largely on the 1993 report of the American Veterinary Medical Association (AVMA) Panel on Euthanasia....
Reference intervals and physiologic alterations in hematologic and biochemical values of free-ranging desert tortoises in the Mojave Desert
Mary M. Christopher, Kristin H. Berry, I.R. Wallis, K.A. Nagy, B.T. Henen, C.C. Peterson
1999, Journal of Wildlife Diseases (35) 212-238
Desert tortoise (Gopherus agassizii) populations have experienced precipitous declines resulting from the cumulative impact of habitat loss, and human and disease-related mortality. Evaluation of hematologic and biochemical responses of desert tortoises to physiologic and environmental factors can facilitate the assessment of stress and disease in tortoises and contribute to management...
Stem demography and postfire recruitment of a resprouting serotinous conifer
Jon E. Keeley, Melanie B. Keeley, William J. Bond
1999, Journal of Vegetation Science (10) 69-76
The contribution of resprouts and seedling recruitment to post-fire regeneration of the South African fynbos conifer Widdringtonia nodiflora was compared eight months after wildfires in 1990. Stems on all trees were killed by fire but resprouting success was > 90 % at all but one site. A demographic study of...
Subcutaneous anchor attachment increases retention of radio transmitters on Xantus' and marbled murrelets
Scott H. Newman, John Y. Takekawa, Darrell L. Whitworth, Esther E. Burkett
1999, Journal of Field Ornithology (70) 520-534
We modified a subcutaneous anchor attachment and achieved transmitter reten- tion times that exceeded those reported previously for other attachments used on alcids. Traditional suture and epoxy attachment methods were used on Xantus' Murrelets in 1995 and 1996, while the modified attachment was used for Xantus' Murrelets in 1996 and...
Relations of surface-water quality to streamflow in the Atlantic Coastal, lower Delaware River, and Delaware Bay basins, New Jersey, water years 1976-93
Kathryn Hunchak-Kariouk, Debra E. Buxton, R. Edward Hickman
1999, Water-Resources Investigations Report 98-4244
Relations of water quality to streamflow were determined for 18 water-quality constituents at 28 surface-water-quality stations within the drainage area of the Atlantic Coastal, lower Delaware River, and Delaware Bay Basins for water years 1976-93. Surface-water-quality and streamflow data were evaluated for trends (through time) in constituent concentrations during high...
Upper Klamath Lake Basin nutrient-loading study: Assessment of historic flows in the Williamson and Sprague rivers
John C. Risley, Antonius Laenen
1999, Water-Resources Investigations Report 98-4198
The Williamson River Basin, located in south-central Oregon, has a drainage area of approximately 3,000 square miles. The Sprague River, which flows into the Williamson River Basin, has a drainage area of 1,580 square miles. Together, the Williamson and Sprague Rivers supply about one-half of the inflow to Upper Klamath...
Estimation of potential runoff-contributing areas in the Kansas-Lower Republican River basin, Kansas
Kyle E. Juracek
1999, Water-Resources Investigations Report 99-4089
Digital soils and topographic data were used to estimate and compare potential runoff-contributing areas for 19 selected subbasins representing soil, slope, and runoff variability within the Kansas-Lower Republican (KLR) River Basin. Potential runoff-contributing areas were estimated separately and collectively for the processes of infiltration-excess and saturation-excess overland flow using a...
Application of spatially referenced regression modeling for the evaluation of total nitrogen loading in the Chesapeake Bay watershed
Stephen D. Preston, John W. Brakebill
1999, Water-Resources Investigations Report 99-4054
The reduction of stream nutrient loads is an important part of current efforts to improve water quality in the Chesapeake Bay. To design programs that will effectively reduce stream nutrient loading, resource managers need spatially detailed information that describes the location of nutrient sources and the watershed factors that affect...
