Distance sampling for Sonoran Desert tortoises
Don E. Swann, Roy C. Averill-Murray, Cecil R. Schwalbe
2002, Journal of Wildlife Management (66) 969-975
We used line transects and distance sampling in combination with radiotelemetry to estimate density of a desert tortoise (Gopherus agassizii) population in the Rincon Mountains near Tucson, Arizona, USA, as part of a long-term study evaluating the impact of urban development on tortoises. During 2000, 34 1-km transects were each...
Increased incidence of red imported fire ant (Hymenoptera: Formicidae) presence in loggerhead sea turtle (Testudines: Cheloniidae) nests and observations of hatchling mortality
L.B. Parris, M.M. Lamont, R.R. Carthy
2002, Florida Entomologist (85) 514-517
No abstract available....
Spatial forecasting of disease risk and uncertainty
L. De Cola
2002, Cartography and Geographic Information Science (29) 363-380
Because maps typically represent the value of a single variable over 2-dimensional space, cartographers must simplify the display of multiscale complexity, temporal dynamics, and underlying uncertainty. A choropleth disease risk map based on data for polygonal regions might depict incidence (cases per 100,000 people) within each polygon for a year...
Reproductive success of the interior least tern (Sterna antillarum) in relation to hydrology on the Lower Mississippi River
Katie M. Dugger, Mark R. Ryan, David L. Galat, Rochelle B. Renken, John W Smith
2002, River Research and Applications (18) 97-105
The annual hydrograph of large rivers, including flood pulses and low-flow periods, is believed to play a primary role in the productivity of biota associated with these ecosystems. We investigated the relationship between river hydrology and Interior least tern (Sterna antillarum) reproductive success on the Lower Mississippi River from April...
The impact of climatic and seismic events on the short-term evolution of seacliffs based on 3-D mapping: Northern Monterey Bay, California
C. Hapke, B. Richmond
2002, Marine Geology (187) 259-278
Coastal cliff retreat along the central California coast is episodic, occurring in response to single large storms or seismic events. Traditional approaches to the study of long-term seacliff retreat utilize historical aerial photography and maps to delineate the landward migration of the top edge of the cliff over periods of...
An application of LIDAR to analyses of El Nino erosion in the Netarts littoral cell, Oregon
D.L. Revell, P.D. Komar, A. H. Sallenger Jr.
2002, Journal of Coastal Research (18) 792-801
El Nin??o produces coastal and beach erosion along the West Coast of the USA by elevating mean water levels so that tides are significantly higher than predicted, and by altering the paths of storms that generate large waves. In the past it has been difficult to adequately document the erosion...
An assessment of injury to sediments and sediment-dwelling organisms in the Grand Calumet River and Indiana Harbor Area of Concern, USA
D.D. MacDonald, C.G. Ingersoll, D.E. Smorong, R.A. Lindskoog, D. W. Sparks, J.R. Smith, T.P. Simon, M.A. Hanacek
2002, Archives of Environmental Contamination and Toxicology (43) 141-155
This article is the first in a series of three that describe the results of a Natural Resource Damage Assessment (NRDA) conducted in the Grand Calumet River and Indiana Harbor Area of Concern (IHAOC). The assessment area is located in northwest Indiana and was divided into nine reaches to facilitate...
Effects of canopy gaps and flooding on homopterans in a bottomland hardwood forest
L.E. Gorham, S.L. King, B. D. Keeland, S. Mopper
2002, Wetlands (22) 541-549
Canopy disturbance is a major factor affecting forest structure and composition and, as a result of habitat alterations, can influence insect communities. We initiated a field study to quantify the effects of canopy disturbance on aerial insect abundance and distribution within a bottomland hardwood forest along the Cache River, Arkansas,...
Nonlinear and linear site response and basin effects in Seattle for the M 6.8 Nisqually, Washington, earthquake
A.D. Frankel, D. L. Carver, R. A. Williams
2002, Bulletin of the Seismological Society of America (92) 2090-2109
We used recordings of the M 6.8 Nisqually earthquake and its ML 3.4 aftershock to study site response and basin effects for 35 locations in Seattle, Washington. We determined site amplification from Fourier spectral ratios of the recorded horizontal ground motions, referenced to a soft-rock site. Soft-soil sites (generally National...
Changes in groundwater quality in a conduit-flow-dominated karst aquifer, following BMP implementation
J.C. Currens
2002, Environmental Geology (42) 525-531
Water quality in the Pleasant Grove Spring karst groundwater basin, Logan County, Kentucky, was monitored to determine the effectiveness of best management practices (BMPs) in protecting karst aquifers. Ninety-two percent of the 4,069-ha (10,054-acre) watershed is used for agriculture. Water-quality monitoring began in October 1992 and ended in November 1998....
A pitfall in shallow shear-wave refraction surveying
J. Xia, R. D. Miller, C.B. Park, E. Wightman, R. Nigbor
2002, Journal of Applied Geophysics (51) 1-9
The shallow shear-wave refraction method works successfully in an area with a series of horizontal layers. However, complex near-surface geology may not fit into the assumption of a series of horizontal layers. That a plane SH-wave undergoes wave-type conversion along an interface in an area of nonhorizontal layers is theoretically...
Forensic applications of nitrogen and oxygen isotopes in tracing nitrate sources in urban environments
S. R. Silva, P. B. Ging, R. W. Lee, J.C. Ebbert, A. J. Tesoriero, E. L. Inkpen
2002, Environmental Forensics (3) 125-130
Ground and surface waters in urban areas are susceptible to nitrate contamination from septic systems, leaking sewer lines, and fertilizer applications. Source identification is a primary step toward a successful remediation plan in affected areas. In this respect, nitrogen and oxygen isotope ratios of nitrate, in conjunction with hydrologic data...
An upwelling model for the Phosphoria sea: A Permian, ocean-margin sea in the northwest United States
D.Z. Piper, P. K. Link
2002, American Association of Petroleum Geologists Bulletin (86) 1217-1235
The Permian Phosphoria Formation, a petroleum source rock and world-class phosphate deposit, was deposited in an epicratonic successor basin on the western margin of North America. We calculate the seawater circulation in the basin during deposition of the lower ore zone in the Meade Peak Member from the accumulation rates...
Long-term dynamics of winter and summer annual communities in the Chihuahuan Desert
Qinfeng Guo, James H. Brown, T. J. Valone
2002, Journal of Vegetation Science (13) 575-584
Winter and summer annuals in the Chihuahuan Desert have been intensively studied in recent years but little is known about the similarities and differences in the dynamics between these two communities. Using 15 yr of census data from permanent quadrats, this paper compared the characteristics and temporal dynamics of these...
Comparison of stomach contents of haddock (Melanogrammus aeglefinus) from the 1981 and 1991 North Sea International Stomach Sampling Projects
S.A. Adlerstein, A. Temming, N. Mergardt
2002, ICES Journal of Marine Science (59) 497-515
This study analyses data from over 20 000 haddock stomachs collected during the 1981 and 1991 Stomach Sampling Projects of the North Sea. Sampling was within the framework of the Multispecies Virtual Population Analysis (MSVPA) for fisheries stock assessment. In 1981 stomachs were collected to calculate input feeding parameters from...
Gas geochemistry of the Valles caldera region, New Mexico and comparisons with gases at Yellowstone, Long Valley and other geothermal systems
F. Goff, C. J. Janik
2002, Journal of Volcanology and Geothermal Research (116) 299-323
Noncondensible gases from hot springs, fumaroles, and deep wells within the Valles caldera geothermal system (210-300??C) consist of roughly 98.5 mo1% CO2, 0.5 mol% H2S, and 1 mol% other components. 3He/4He ratios indicate a deep magmatic source (R/Ra up to 6) whereas ??13C-CO2 values (-3 to -5???) do not discriminate...
Magmatic inflation at a dormant stratovolcano: 1996-1998 activity at Mount Peulik volcano, Alaska, revealed by satellite radar interferometry
Zhong Lu, Charles W. Wicks Jr., Daniel Dzurisin, John A. Power, Seth C. Moran, Wayne R. Thatcher
2002, Journal of Geophysical Research B: Solid Earth (107) ETG 4-1-ETG 4-13
A series of ERS radar interferograms that collectively span the time interval from July 1992 to August 2000 reveal that a presumed magma body located 6.6 ??? 0.5 km beneath the southwest flank of the Mount Peulik volcano inflated 0.051 ??? 0.005 km3 between October 1996 and September 1998. Peulik...
Effects of colony relocation on diet and productivity of Caspian terns
Daniel D. Roby, Ken Collis, Donald E. Lyons, D. P. Craig, Jessica Y. Adkins, Anne Mary Myers, Robert M. Suryan
2002, Journal of Wildlife Management (66) 662-673
We investigated the efficacy of management to reduce the impact of Caspian tern (Sterna caspia) predation on survival of juvenile salmonids (Oncorhynchus spp.) in the Columbia River estuary. Resource managers sought to relocate approximately 9,000 pairs of terns nesting on Rice Island (river km 34) to East Sand Island (river...
Denitrification in the recharge area and discharge area of a transient agricultural nitrate plume in a glacial outwash sand aquifer, Minnesota
J.K. Böhlke, R. Wanty, M. Tuttle, G. Delin, Matthew K. Landon
2002, Water Resources Research (38) 10-1-10-26
Recharge rates of nitrate (NO3−) to groundwater beneath agricultural land commonly are greater than discharge rates of NO3− in nearby streams, but local controls of NO3−distribution in the subsurface generally are poorly known. Groundwater dating (CFC, 3H) was combined with chemical (ions and gases) and stable isotope (N, S, and C) analyses...
Evaluation of numerical sediment quality targets for the St. Louis River Area of Concern
J.L. Crane, D.D. MacDonald, C.G. Ingersoll, D.E. Smorong, R.A. Lindskoog, C.G. Severn, T.A. Berger, L.J. Field
2002, Archives of Environmental Contamination and Toxicology (43) 1-10
Numerical sediment quality targets (SQTs) for the protection of sediment-dwelling organisms have been established for the St. Louis River Area of Concern (AOC), 1 of 42 current AOCs in the Great Lakes basin. The two types of SQTs were established primarily from consensus-based sediment quality guidelines. Level I SQTs are...
Evaluation of a Mysis bioenergetics model
Steven R. Chipps, David H. Bennett
2002, Journal of Plankton Research (24) 77-82
Direct approaches for estimating the feeding rate of the opossum shrimp Mysis relicta can be hampered by variable gut residence time (evacuation rate models) and non-linear functional responses (clearance rate models). Bioenergetics modeling provides an alternative method, but the reliability of this approach needs to be evaluated using independent measures...
HIBAL: A hydrologic-isotopic-balance model for application to paleolake systems
L. Benson, F. Paillet
2002, Quaternary Science Reviews (21) 1521-1539
A simple hydrologic-isotopic-balance (HIBAL) model for application to paleolake ??18O records is presented. Inputs to the model include discharge, on-lake precipitation, evaporation, and the ??18O values of these fluid fluxes. Monthly values of climatic parameters that govern the fractionation of 18O and 16O during evaporation have been extracted from historical...
Reconstruction of hydrological changes and response to effective moisture variations from North-Central USA lake sediments
A. Schwalb, W.E. Dean
2002, Quaternary Science Reviews (21) 1541-1554
Ratios of the stable isotopes of oxygen and carbon in benthic ostracodes and marl from cores taken from two lakes in north-central Minnesota reflect Holocene hydrological and vegetation changes. Oxygen isotopes show that Williams and Shingobee Lakes, located in the same watershed but with different positions along a hydrologic gradient,...
September-March survival of female northern pintails radiotagged in San Joaquin Valley, California
Joseph P. Fleskes, D.M. Jarzen, David S. Gilmer
2002, Journal of Wildlife Management (66) 901-911
To improve understanding of pintail ecology, we radiotagged 191 hatch-year (HY) and 228 after-hatch-year (AHY) female northern pintails (Anas acuta) in the San Joaquin Valley (SJV), and studied their survival throughout central California, USA, during September-March, 1991-1994. We used adjusted Akaike Information Criterion (AICc) values to contrast known-fate models and...
The Saguenay Fjord, Quebec, Canada: Integrating marine geotechnical and geophysical data for spatial seismic slope stability and hazard assessment
R. Urgeles, J. Locat, H.J. Lee, F. Martin
2002, Marine Geology (185) 319-340
In 1996 a major flood occurred in the Saguenay region, Quebec, Canada, delivering several km3 of sediment to the Saguenay Fjord. Such sediments covered large areas of the, until then, largely contaminated fjord bottom, thus providing a natural capping layer. Recent swath bathymetry data have also shown that sediment landslides...
