Annual layers revealed by GPR in the subsurface of a prograding coastal barrier, southwest Washington, U.S.A
L. J. Moore, H.M. Jol, S. Kruse, S. Vanderburgh, G. M. Kaminsky
2004, Journal of Sedimentary Research (74) 690-696
The southwest Washington coastline has experienced extremely high rates of progradation during the late Holocene. Subsurface stratigraphy, preserved because of progradation and interpreted using ground-penetrating radar (GPR), has previously been used successfully to document coastal response to prehistoric storm and earthquake events. New GPR data collected at Ocean Shores, Washington,...
Changing perspectives on pearly mussels, North America's most imperiled animals
David L. Strayer, John A. Downing, Wendell R. Haag, Tim L. King, James B. Layzer, Teresa J. Newton, S. Jerrine Nichols
2004, BioScience (54) 429-439
Pearly mussels (Unionacea) are widespread, abundant, and important in freshwater ecosystems around the world. Catastrophic declines in pearly mussel populations in North America and other parts of the world have led to a flurry of research on mussel biology, ecology, and conservation. Recent research on mussel feeding, life history, spatial...
Oreochromis aureus reproduction in the Muddy River
K.M. Swaim, R.R McShane, G.G. Scoppettone
2004, Report
No abstract available ...
Risk assessment and screening for potentially invasive fishes
C. Kolar
2004, New Zealand Journal of Marine and Freshwater Research (38) 391-397
Preventing the introduction of potentially invasive species is becoming more important as this worldwide problem continues to grow. The ability to predict the identity or range of potential invaders could influence regulatory decisions and help to optimally allocate resources to deal with ongoing invasions. One screening tool presented here, using...
Flow cytometry used to assess genetic damage in frogs from farm ponds
B.L. Bly, M. G. Knutson, M.B. Sandheinrich, B. R. Gray, D.A. Jobe
2004, Journal of the Iowa Academy of Science (111) 67-70
Flow cytometry (FC) is a laboratory method used to detect genetic damage induced by environmental contaminants and other stressors in animals, including amphibians. We tested FC methods on three species of ranid frogs collected from farm ponds and natural wetlands in southeastern Minnesota. We compared FC metrics for Rana clamitans...
Spatial variation in fish species richness of the upper Mississippi River system
T.M. Koel
2004, Transactions of the American Fisheries Society (133) 984-1003
Important natural environmental gradients, including the connectivity of off-channel aquatic habitats to the main-stem river, have been lost in many reaches of the upper Mississippi River system, and an understanding of the consequences of this isolation is lacking in regard to native fish communities. The objectives of this study were...
Reintroduction of the flannelmouth sucker in the lower Colorado River
G.A. Mueller, R. Wydoski
2004, North American Journal of Fisheries Management (24) 41-46
A single stocking of 611 wild flannelmouth suckers Catostomus latipinnis in 1976 represented the first successful reintroduction of a native fish in the lower Colorado River. Flannelmouth suckers ranging in age from young of the year to 24 years were captured during 1999–2001; their population was estimated as at least...
Discovery of Sphaeroma terebrans, a wood-boring isopod, in the red mangrove, Rhizophora mangle, habitat of northern Florida Bay
R. A. Brooks
2004, Ambio (33) 171-173
No abstract available....
Effects of lowhead dams on riffle-dwelling fishes and macroinvertebrates in a Midwestern river
J.S. Tiemann, D.P. Gillette, M. L. Wildhaber, D.R. Edds
2004, Transactions of the American Fisheries Society (133) 705-717
Many studies have assessed the effects of large dams on fishes and macroinvertebrates, but few have examined the effects of lowhead dams. We sampled fishes, macroinvertebrates, habitat, and physicochemistry monthly from November 2000 to October 2001 at eight gravel bar sites centered around two lowhead dams on the Neosho River,...
Effects of dissolved carbonate on arsenate adsorption and surface speciation at the hematite-water interface
Y. Arai, D.L. Sparks, J.A. Davis
2004, Environmental Science & Technology (38) 817-824
Effects of dissolved carbonate on arsenate [As(V)] reactivity and surface speciation at the hematite−water interface were studied as a function of pH and two different partial pressures of carbon dioxide gas [PCO2 = 10-3.5 atm and ∼0; CO2-free argon (Ar)] using adsorption kinetics, pseudo-equilibrium adsorption/titration experiments, extended X-ray absorption...
Host social behavior and parasitic infection: A multifactorial approach
V.O. Ezenwa
2004, Behavioral Ecology (15) 446-454
I examined associations between several components of host social organization, including group size and gregariousness, group stability, territoriality and social class, and gastrointestinal parasite load in African bovids. At an intraspecific level, group size was positively correlated with parasite prevalence, but only when the parasite was relatively host specific and...
Seasonal Daphnia biomass in winterkill and nonwinterkill glacial lakes of South Dakota
D.A. Isermann, S. R. Chipps, M. L. Brown
2004, North American Journal of Fisheries Management (24) 287-292
We compared the seasonal biomass (??g dry weight/L) and body size of Daphnia pulex populations between South Dakota lakes that experienced nearly complete winterkill (n = 2) and those that did not experience fish winterkill the previous winter (n = 2). In spring (March-May), D. pulex biomass was substantially lower...
Geochemical cycles in sediments deposited on the slopes of the Guaymas and Carmen Basins of the Gulf of California over the last 180 years
W. Dean, C. Pride, R. Thunell
2004, Quaternary Science Reviews (23) 1817-1833
Sediments deposited on the slopes of the Guaymas and Carmen Basins in the central Gulf of California were recovered in two box cores. Q-mode factor analyses identified detrital-clastic, carbonate, and redox associations in the elemental composition of these sediments. The detrital-clastic fraction appears to contain two source components, a more...
Variation in responses to spawning Pacific salmon among three south-eastern Alaska streams
D. T. Chaloner, G. A. Lamberti, R.W. Merritt, N.L. Mitchell, P.H. Ostrom, M.S. Wipfli
2004, Freshwater Biology (49) 587-599
1. Pacific salmon are thought to stimulate the productivity of the fresh waters in which they spawn by fertilising them with marine-derived nutrients (MDN). We compared the influence of salmon spawners on surface streamwater chemistry and benthic biota among three southeastern Alaska streams. Within each stream, reaches up- and downstream...
Fast ground-water mixing and basal recharge in an unconfined, alluvial aquifer, Konza LTER Site, Northeastern Kansas
G.L. Macpherson, M. Sophocleous
2004, Journal of Hydrology (286) 271-299
Ground-water chemistry and water levels at three levels in a well nest were monitored biweekly for two and a half years in a shallow unconfined floodplain aquifer in order to study the dynamics of such shallow aquifers. The aquifer, in northeastern Kansas, consists of high porosity, low hydraulic conductivity fine-grained...
Field and laboratory arsenic speciation methods and their application to natural-water analysis
A.J. Bednar, J.R. Garbarino, M.R. Burkhardt, J. F. Ranville, T.R. Wildeman
2004, Water Research (38) 355-364
The toxic and carcinogenic properties of inorganic and organic arsenic species make their determination in natural water vitally important. Determination of individual inorganic and organic arsenic species is critical because the toxicology, mobility, and adsorptivity vary substantially. Several methods for the speciation of arsenic in groundwater, surface-water, and acid mine...
A review of models and micrometeorological methods used to estimate wetland evapotranspiration
J.Z. Drexler, R.L. Snyder, D. Spano, U.K.T. Paw
2004, Hydrological Processes (18) 2071-2101
Within the past decade or so, the accuracy of evapotranspiration (ET) estimates has improved due to new and increasingly sophisticated methods. Yet despite a plethora of choices concerning methods, estimation of wetland ET remains insufficiently characterized due to the complexity of surface characteristics and the diversity of wetland types. In...
National Wildlife Health Center Quarterly Mortality Report
K. A. Converse, R. Sohn, Kimberli J.G. Miller, G. McLaughlin
2004, Supplement to the Journal of Wildlife Diseases (40)
Habitat restoration across large areas: Assessing wildlife responses in the Clearwater basin, Idaho
L.K. Scanvara, G. Servheen, W. Melquist, D. Davis, J. M. Scott
2004, Western Journal of Applied Forestry (19) 123-132
Over the past century, fire suppression and prevention have altered disturbance regimes across the Pacific Northwest, resulting in a significant divergence of historical and current conditions in forested habitats. To address this continuing trend in habitat changes and begin restoring historical patterns of disturbance, the Clearwater Basin Elk Habitat Initiative...
In-situ measurements of velocity structure within turbidity currents
J. P. Xu, M.A. Noble, L.K. Rosenfeld
2004, Geophysical Research Letters (31)
Turbidity currents are thought to be the main mechanism to move ???500,000 m3 of sediments annually from the head of the Monterey Submarine Canyon to the deep-sea fan. Indirect evidence has shown frequent occurrences of such turbidity currents in the canyon, but the dynamic properties of the turbidity currents such...
Identification of amoebae implicated in the life cycle of Pfiesteria and Pfiesteria-like dinoflagellates
M.T. Peglar, T.A. Nerad, O.R. Anderson, P.M. Gillevet
2004, Journal of Eukaryotic Microbiology (51) 542-552
This study was undertaken to assess whether amoebae commonly found in mesohaline environments are in fact stages in the life cycles of Pfiesteria and Pfiesteria-like dinoflagellates. Primary isolations of amoebae and dinoflagellates were made from water and sediment samples from five tributaries of the Chesapeake Bay. Additional amoebae were also cloned from bioassay aquaria...
Evidence for liquefaction identified in peeled slices of Holocene deposits along the Lower Columbia River, Washington
K. Takada, B.F. Atwater
2004, Bulletin of the Seismological Society of America (94) 550-575
Peels made from 10 geoslices beneath a riverbank at Washington's Hunting Island, 45 km inland from the Pacific coast, aid in identifying sand that liquefied during prehistoric earthquakes of estimated magnitude 8-9 at the Cascadia subduction zone. Each slice was obtained by driving sheetpile and a shutter plate to depths...
Characterization and origin of polar dissolved organic matter from the Great Salt Lake
J.A. Leenheer, T.I. Noyes, C.E. Rostad, M.L. Davisson
2004, Biogeochemistry (69) 125-141
Polar dissolved organic matter (DOM) was isolated from a surface-water sample from the Great Salt Lake by separating it from colloidal organic matter by membrane dialysis, from less-polar DOM fractions by resin sorbents, and from inorganic salts by a combination of sodium cation exchange followed by precipitation of sodium salts...
Hydrochemical tracers in the middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model
W. E. Sanford, Niel Plummer, D. P. McAda, L. M. Bexfield, S. K. Anderholm
2004, Hydrogeology Journal (12) 389-407
The calibration of a groundwater model with the aid of hydrochemical data has demonstrated that low recharge rates in the Middle Rio Grande Basin may be responsible for a groundwater trough in the center of the basin and for a substantial amount of Rio Grande water in the regional flow...
Methods for estimating adsorbed uranium(VI) and distribution coefficients of contaminated sediments
M. Kohler, G.P. Curtis, D.E. Meece, J.A. Davis
2004, Environmental Science & Technology (38) 240-247
Assessing the quantity of U(VI) that participates in sorption/desorption processes in a contaminated aquifer is an important task when investigating U migration behavior. U-contaminated aquifer sediments were obtained from 16 different locations at a former U mill tailings site at Naturita, CO (U.S.A.) and were extracted with an artificial groundwater,...
