A120 yr record of widespread contamination from mining of the Iberian pyrite belt
A. VanGeen, J.F. Adkins, E.A. Boyle, C.H. Nelson, A. Palanques
1997, Geology (25) 291-294
A metal-enriched seawater plume entering the western Mediterranean Sea through the Strait of Gibraltar originates 300 km to the west in the Rio Tinto estuary of southwestern Spain. Mining of Rio Tinto ore, one of the largest metal-rich sulfide deposits in the world,...
Using conditional simulations of the level of Devils Lake, North Dakota, to reconstruct historical hydrologic conditions
Aldo V. Vecchia, Gregg J. Wiche
1997, Proceedings of the North Dakota Academy of Science (51) 40-44
No abstract available....
Source-sink dynamics and the coexistence of species on a single resource
M. Loreau, D.L. DeAngelis
1997, Theoretical Population Biology (51) 79-93
We investigate the potential for coexistence of species that compete for a shared resource when the resource occurs in both a source area acting as a refuge and a sink area where it is used by the competing species. Our model shows that the mixing rate between the source and...
Effects of habitat suitability on the survival of relocated freshwater mussels
Hannah M. Hamilton, Jayne Brim-Box, Robert M. Dorazio
1997, Regulated Rivers: Research & Management (13) 537-541
Freshwater mussels are often relocated from existing beds for both conservation and management reasons. In this study, we empirically tested whether the habitat type at the destination site was important in predicting the success of mussel relocation. In 1993, four species of freshwater mussels were relocated in the Apalachicola River...
Clutch size and frequency in Florida box turtles (Terrapene carolina bauri): Implications for conservation
C.K. Dodd Jr.
1997, Chelonian Conservation and Biology (2) 370-377
Abstract not supplied at this time...
Middle Jurassic incised valley fill (eolian/estuarine) and nearshore marine petroleum reservoirs, Powder River Basin
Thomas S. Ahlbrandt, J. E. Fox
1997, Mountain Geologist (34) 97-115
Paleovalleys incised into the Triassic Spearfish Formation (Chugwater equivalent) are filled with a vertical sequence of eolian, estuarine, and marine sandstones of the Middle Jurassic (Bathonian age) Canyon Springs Sandstone Member of the Sundance Formation. An outcrop exemplifying this is located at Red Canyon in the southern Black Hills, Fall...
Low shear stress gravel-bed river
Robert T. Milhous
1997, Conference Paper, Proceedings, Congress of the International Association of Hydraulic Research, IAHR
A low stress gravel bed river is a river where the cross-sectional average dimensionless shear stress (??*) rarely exceeds 0.047. That is the case for the Gunnison River below Delta in Western Colorado. The cross-sectional average ??* in the Gunnison River has not exceeded 0.047, except at one cross section...
Effects of fish density and river fertilization on algal standing stocks, invertebrates communities, and fish production in an Arctic River
Linda A. Deegan, B. J. Peterson, H. Golden, C.C. McIvor, M.C. Miller
1997, Canadian Journal of Fisheries and Aquatic Sciences (54) 269-283
This study examined the relative importance of bottom-up and top-down controls of an arctic stream food web by simultaneous manipulation of the top predator and nutrient availability. We created a two-step trophic system (algae to insects) by removal of the top predator (Arctic grayling, Thymallus arcticus) in fertilized and control...
Epidermal tumors of rainbow smelt with associated virus
R. L. Herman, C.N. Burke, S. Perry
1997, Journal of Wildlife Diseases (33) 925-929
Epithelial tumors of the skin occurred in landlocked populations of rainbow smelt (Osmerus mordax) in several lakes in New Hampshire (USA) during the spawning runs. Histologically, these were noninvasive epithelial cell lesions. Herpesvirus-like particles could be seen in the nucleus and cytoplasm. The...
Modeling fish dynamics and effects of stress in a hydrologically pulsed ecosystem
D.L. DeAngelis, W.F. Loftus, J.C. Trexler, Robert E. Ulanowicz
1997, Journal of Aquatic Ecosystem Stress and Recovery (1) 1-13
Many wetlands undergo seasonal cycles in precipitation and water depth. This environmental seasonality is echoed in patterns of production of fish biomass, which, in turn, influence the phenology of other components of the food web, including wading birds. Human activities, such as drainage or other alterations of the hydrology, can...
Effects of spring environment on nesting phenology and clutch size of Black Brant
M. S. Lindberg, J.S. Sedinger, Paul L. Flint
1997, Condor (99) 381-388
We studied the effects of timing of spring snowmelt on nesting phenology, nest site selection, and clutch size of Black Brant (Branta bernicla nigricans) breeding at the Tutakoke river colony, Yukon-Kuskokwim Delta, Alaska. In late springs, brant nested later: however, time between peak arrival at Tutakoke and nest initiation (6...
The interaction of spatial scale and predator-prey functional response
T.W. Blaine, D.L. DeAngelis
1997, Ecological Modelling (95) 319-328
Predator-prey models with a prey-dependent functional response have the property that the prey equilibrium value is determined only by predator characteristics. However, in observed natural systems (for instance, snail-periphyton interactions in streams) the equilibrium periphyton biomass has been shown experimentally to be influenced by both snail numbers and levels of...
Groundwater record of halocarbon transport by the Danube River
J.K. Böhlke, K. Revesz, E. Busenberg, J. Deak, E. Deseo, M. Stute
1997, Environmental Science & Technology (31) 3293-3299
Groundwater dating studies have supported the concept that aquifers with low coefficients of dispersion may contain coherent records of past conditions in recharge areas. Groundwater records can provide unique information about natural or anthropogenic changes in the atmosphere and hydrosphere where long-term monitoring data are not available. Here we describe...
Taxonomy and distribution of the genus Muelleria frenguelli
S. A. Spaulding, E. F. Stoermer
1997, Diatom Research (12) 95-113
Navicula gibbula Cleve and its allies have a number of morphological characters which are visible under the light microscope and distinguish them from taxa included in Navicula Bory sensu stricto. These include proximal raphe ends which are sharply and unilaterally hooked and often extend beyond the central area, as well as two apparently...
The IGBP-DIS global 1 km land cover data set, DISCover: First results
Thomas R. Loveland, A.S. Belward
1997, International Journal of Remote Sensing (18) 3289-3295
The International Geosphere-Biosphere Programme Data and Information System (IGBP-DIS) is co-ordinating the development of global land data sets from Advanced Very High Resolution Radiometer (AVHRR) data. The first is a 1 km spatial resolution land cover product 'DISCover', based on monthly Normalized Difference Vegetation Index composites from 1992 and 1993....
The future of scientific communication in the earth sciences: The impact of the internet
T.R. Carr, R.C. Buchanan, D. Adkins-Heljeson, T.D. Mettille, J. Sorensen
1997, Computers & Geosciences (23) 503-512
Publication on paper of research results following peer-review and editing has been the accepted means of scientific communication for several centuries. Today, the continued growth in the volume of scientific literature, the increased unit costs of archiving paper publications, and the rapidly increasing power and availability of electronic technology are...
The effect of functional response on stability of a grazer population on a landscape
A.D. Basset, D.L. DeAngelis, J.E. Diffendorfer
1997, Ecological Modelling (101) 153-162
The dynamics of interacting consumer and resource populations is one of the most thoroughly studied problems of theoretical population biology. Among the key results from the study of simple mathematical models of interacting populations is that the Holling Type 2 functional response tends to be unstable for a wide range...
Effects of basin size on low-flow stream chemistry and subsurface contact time in the neversink river watershed, New York
D.M. Wolock, J. Fan, G.B. Lawrence
1997, Hydrological Processes (11) 1273-1286
The effects of basin size on low-flow stream chemistry and subsurface contact time were examined for a part of the Neversink River watershed in southern New York State. Acid neutralizing capacity (ANC), the sum of base cation concentrations (SBC), pH and concentrations of total aluminum...
Sedimentation and subsidence patterns in the central and north basins of Lake Baikal from seismic stratigraphy
T.C. Moore Jr., Kim D. Klitgord, A.J. Golmshtok, E. Weber
1997, Geological Society of America Bulletin (109) 746-766
Comparison of sedimentation patterns, basement subsidence, and faulting histories in the north and central basins of Lake Baikal aids in developing an interbasinal seismic stratigraphy that reveals the early synrift evolution of the central portion of the Baikal rift, a major continental rift system. Although there is evidence that the...
Commerce geophysical lineament - Its source, geometry, and relation to the Reelfoot rift and New Madrid seismic zone
V.E. Langenheim, T.G. Hildenbrand
1997, Geological Society of America Bulletin (109) 580-595
The Commerce geophysical lineament is a northeast-trending magnetic and gravity feature that extends from central Arkansas to southern Illinois over a distance of ≈400 km. It is parallel to the trend of the Reelfoot graben, but offset ≈40 km to the northwest of...
Permo-Carboniferous sedimentary basins related to the distribution of planetary cryptoblemes
J. F. Windolph Jr.
1997, Prace - Panstwowego Instytutu Geologicznego (157) 87-89
Massive/high velocity solar, galactic, and cosmic debris impacting the Earths surface may account for the enormous energy required for the formation of Permo-Carboniferous sedimentary basins and related mountain building orogenies. Analysis of satellite immagry, sea floor sonar, geophysical data, and geotectonic fabrics show a strong correlation throughout geologic time between...
Crustal structure along the west flank of the Cascades, western Washington
K.C. Miller, Gordon R. Keller, J.M. Gridley, James H. Luetgert, Walter D. Mooney, H. Thybo
1997, Journal of Geophysical Research B: Solid Earth (102) 17857-17873
Knowledge of the crustal structure of the Washington Cascades and adjacent Puget Lowland is important to both earthquake hazards studies and geologic studies of the evolution of this tectonically active region. We present a model for crustal velocity structure derived from analysis of seismic refraction/wide-angle reflection data collected in 1991...
An increase in herbivory of cottonwood in yellowstone national park
R.B. Keigley
1997, Northwest Science (71) 127-136
This study examined an effect of elk (Cervus elaphus nelsoni) on narrowleaf cottonwood (Populus angustifolia) in northern Yellowstone National Park, where stands consist of old trees and younger, densely-branched bushes. The elk herd increased from a census of 3,172 in 1968 to a census of 18,913 in 1988. The purposes...
Altered streamflow and sediment entrainment in the Gunnison Gorge
J. G. Elliott, R. S. Parker
1997, Journal of the American Water Resources Association (33) 1041-1054
The Gunnison River in the Gunnison Gorge is a canyon river where upstream dams regulate mainstem discharge but do not affect debris-flow sediment supply from tributaries entering below the reservoirs. Regulation since 1966 has altered flood frequency, streambed mobility, and fluvial geomorphology creating potential resource-management issues. The duration of moderate...
Culture and serodiagnostic detection of Aeromonas salmonicida from covertly-infected rainbow trout given the stress-induced furunculosis test
G. L. Bullock, R. C. Cipriano, W. B. Schill
1997, Biomedical Letters (55) 169-177
No abstract available....
