Age, growth, and gonadal characteristics of adult bighead carp, Hypophthalmichthys nobilis, in the lower Missouri River
S.J. Schrank, C.S. Guy
2002, Environmental Biology of Fishes (64) 443-450
Bighead carp were introduced into Arkansas in 1973 to improve water clarity in production ponds. Bighead carp subsequently escaped aquaculture facilities in the early 1980's and dispersed into the Mississippi and Missouri rivers. The first documentation of bighead carp reproduction in the Mississippi River system was in 1989. The population...
Estuaries as nurseries for the jacks Caranx ignobilis and Caranx melampygus (Carangidae) in Hawaii
G.C. Smith, J.D. Parrish
2002, Estuarine, Coastal and Shelf Science (55) 347-359
Estuaries provide juvenile nursery habitat for many species of fish that inhabit marine environments as adults. In Hawaii, some juvenile Caranx ignobilis and Caranx melampygus occupy estuaries opportunistically before moving to nearshore ocean habitats. This study examined the extent and nature of estuarine habitat available in the lower Hanalei River...
Transport of suspended solids from a karstic to an alluvial aquifer: The role of the karst/alluvium interface
N. Massei, M. Lacroix, H.Q. Wang, B.J. Mahler, J.P. Dupont
2002, Journal of Hydrology (260) 88-101
This study focuses on the coupled transport of dissolved constituents and particulates, from their infiltration on a karst plateau to their discharge from a karst spring and their arrival at a well in an alluvial plain. Particulate markers were identified and the transport of solids was characterised in situ in...
Multispecies reactive tracer test in an aquifer with spatially variable chemical conditions, Cape Cod, Massachusetts: Dispersive transport of bromide and nickel
Kathryn M. Hess, James A. Davis, Douglas B. Kent, Jennifer A. Coston
2002, Water Resources Research (38) 36-1-36-17
Dispersive transport of groundwater solutes was investigated as part of a multispecies reactive tracer test conducted under spatially variable chemical conditions in an unconfined, sewage‐contaminated sand and gravel aquifer on Cape Cod, Massachusetts. Transport of the nonreactive tracer bromide (Br) reflected physical and hydrologic processes. Transport of the reactive tracer...
Effects of a coastal golf complex on water quality, periphyton, and seagrass
M.A. Lewis, R.G. Boustany, D.D. Dantin, R.L. Quarles, J.C. Moore, R. S. Stanley
2002, Ecotoxicology and Environmental Safety (53) 154-162
The objective of this study was to provide baseline information on the effects of a golf course complex on water quality, colonized periphyton, and seagrass meadows in adjacent freshwater, near-coastal, and wetland areas. The chemical and biological impacts of the recreational facility, which uses reclaimed municipal wastewater for irrigation, were...
Effect of adsorbed metals ions on the transport of Zn- and Ni-EDTA complexes in a sand and gravel aquifer
D.B. Kent, J.A. Davis, L.C.D. Anderson, B.A. Rea, J.A. Coston
2002, Geochimica et Cosmochimica Acta (66) 3017-3036
Adsorption, complexation, and dissolution reactions strongly influenced the transport of metal ions complexed with ethylenediaminetetraacetic acid (EDTA) in a predominantly quartz-sand aquifer during two tracer tests conducted under mildly reducing conditions at pH 5.8 to 6.1. In tracer test M89, EDTA complexes of zinc...
Middle Palaeolithic refugium, or archaeological misconception? A new U-Series and radiocarbon chronology of Abric Agut (Capellades, Spain)
Manola Vaquero, M. Esteban, E. Allue, J. Vallverdu, E. Carbonell, J. L. Bischoff
2002, Journal of Archaeological Science (29) 953-958
New U-Series and C14 (AMS) dates are provided for the Abric Agut (Capellades, Barcelona, Spain). This site was previously considered to be of Middle Palaeolithic age according to the characteristics of the lithic assemblage. In addition, human teeth were uncovered and attributed to neandertals. However, radiometric dating clearly indicates a...
Distribution and transport of suspended particulate matter in Monterey Canyon, California
J. P. Xu, M. Noble, S.L. Eittreim, L.K. Rosenfeld, F.B. Schwing, C.H. Pilskaln
2002, Marine Geology (181) 215-234
From August 1993 to August 1994, six moorings that measure current, temperature, salinity, and water clarity were deployed along the axis of Monterey Canyon to study the circulation and transport of water and suspended particulate matter through the canyon system. The moorings occupied three sites that are morphologically different: a...
A Brownian model for recurrent earthquakes
M.V. Matthews, W.L. Ellsworth, P.A. Reasenberg
2002, Bulletin of the Seismological Society of America (92) 2233-2250
We construct a probability model for rupture times on a recurrent earthquake source. Adding Brownian perturbations to steady tectonic loading produces a stochastic load-state process. Rupture is assumed to occur when this process reaches a critical-failure threshold. An earthquake relaxes the load state to a characteristic ground level and begins...
U-Pb geochronology of zircon and polygenetic titanite from the Glastonbury Complex, Connecticut, USA: An integrated SEM, EMPA, TIMS, and SHRIMP study
J. N. Aleinikoff, R. P. Wintsch, C.M. Fanning, M. J. Dorais
2002, Chemical Geology (188) 125-147
U-Pb ages for zircon and titanite from a granodioritic gneiss in the Glastonbury Complex, Connecticut, have been determined using both isotope dilution thermal ionization mass spectrometry (TIMS) and the sensitive high resolution ion microprobe (SHRIMP). Zircons occur in three morphologic populations: (1) equant to stubby, multifaceted, colorless, (2) prismatic, dark...
Allocation of extracellular enzymatic activity in relation to litter composition, N deposition, and mass loss
R. L. Sinsabaugh, M.M. Carreiro, D.A. Repert
2002, Biogeochemistry (60) 1-24
Decomposition of plant material is a complex process that requires interaction among a diversity of microorganisms whose presence and activity is subject to regulation by a wide range of environmental factors. Analysis of extracellular enzyme activity (EEA) provides a way to relate the functional organization of microdecomposer communities to environmental...
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...
