The need for accuracy in modelling: An example
Douglas H. Johnson, Michael J. Conroy, James D. Nichols
1985, Ecological Modelling (30) 157-161
The need for accurate information in modelling depends on the objectives of the effort, but trustworthy data are essential for a model intended for use in the management of natural resources. This point is illustrated by referring to a recently published model of canvasback ducks. We demonstrate that several key...
Survival of lake trout eggs and fry reared in water from the upper Great Lakes
Michael J. Mac, Carol Cotant Edsall, James G. Seelye
1985, Journal of Great Lakes Research (11) 520-529
As part of continuing studies of the reproductive failure of lake trout (Salvelinus namaycush) in Lake Michigan, we measured the survival of lake trout eggs and fry of different origins and reared in different environments. Eggs and milt were stripped from spawning lake trout collected in the fall of 1980...
Distribution and food habits of young-of-the-year fishes in a backwater lake of the upper Mississippi River
L. E. Holland, M.L. Huston
1985, Journal of Freshwater Ecology (3) 81-91
The distribution patterns and food habits of young-of-the-year (YOY) fishes in a lentic area adjacent to the main channel of Pool 7 of the upper Mississippi River were studied. Habitats sampled grouped distinctly based on percent composition and abundance of YOY fishes with those having submergent vegetation dominated...
Varechaetadrilus fulleri (Oligochaeta: Tubificidae): New record and amendment of morphological description
C. Rex Bingham, Jarl K. Hiltunen
1985, Freshwater Invertebrate Biology (4) 215-218
The tubificid worm Variechaetadrilus fulleri (Annelida: Oligochaeta) was described by Brinkhurst and Kathman (1983) from the Green River, Kentucky, the only locality from which the species has previously been reported. In 1982-84, a number of specimens of V. fulleri were found in the lower Mississippi River and in an adjacent...
Classification of native vegetation at the Woodworth Station, North Dakota
M.I. Meyer
1985, Prairie Naturalist (17) 167-175
Native prairie areas on the Woodworth Station were sampled, classified, described, and mapped. Transect sites were selectively located along different soil moisture gradients. Data were collected from 292 plots using a modified Braun-Blanquet cover estimation technique. Trees and tall shrubs (over 2 m) were not sampled because they made up...
Lake trout reproductive behavior: influence of chemosensory cues from young-of-the-year by-products
Neal R. Foster
1985, Transactions of the American Fisheries Society (114) 794-803
Chemosensory cues, particularly those emanating from substrate areas occupied by previously hatched young, may play an important role in the reproductive behavior of lake trout Salvelinus namaycush. Support for this hypothesis was obtained in laboratory experiments. Adults were placed in a large circular pool with four experimental reefs. Egg membranes...
Assessment of nasal marker materials and designs used on dabbling ducks
J. T. Lokemoen, D.E. Sharp
1985, Wildlife Society Bulletin (13) 53-56
Abstract has not been submitted...
Organochlorine concentrations in prefledging common terns Sterna hirundo at three Rhode Island USA colonies
T. W. Custer, C.M. Bunck, C.L. Stafford
1985, Colonial Waterbirds (8) 150-154
Concentrations of DDE, polychlorinated biphenyls (PCBs), and polychlorinated diphenyl ethers (PCDPEs) in carcasses of prefledging Common Terns (Sterna hirundo) at three Rhode Island colonies support the hypothesis that local contamination is responsible for among-colony differences observed in eggs in an earlier study. The highest concentrations of DDE and PCBs (mean=0.24...
Effects of wildlife of ethyl and methyl parathion applied to California USA rice fields
T. W. Custer, E. F. Hill, H. M. Ohlendorf
1985, California Fish and Game (71) 220-224
Selected rice fields on the Sacramento National Wildlife Refuge Complex were aerially sprayed one time during May or June 1982 with either ethyl (0.11 kg Al/ha) or methyl (0.84 kg AI/ha) parathion for control of tadpole shrimp, Triops longicaudatus. No sick or dead vertebrate wildlife were found or adjacent to...
Effects of contaminants on toxicity of the lampricides TFM and Bayer 73 to three species of fish
L. L. Marking, T.D. Bills
1985, Journal of Great Lakes Research (11) 171-178
Waters in the Great Lakes basin contain more than 400 contaminant chemicals that potentially affect fishery resources, commerce, and human inhabitants. We determined in the laboratory the effects of selected contaminants on the toxicity of the widely used lampricides TFM (3-trifluoromethyl-4-nitrophenol)...
Invertebrate colonization rates in the tailwater of a Kentucky flood-control reservoir
W.D. Swink, J.F. Novotny
1985, Journal of Freshwater Ecology (3) 27-34
Invertebrate colonization on newly introduced rock substrates was examined from July through October 1982 in the tailwater of Barren River Lake, Kentucky. Chironomidae, the dominant taxon of benthic insects, reached full colonization by day 14. Colonization by Oligochaeta, the other major invertebrate taxon, was not completed by the end...
Observations on twinning in the sea lamprey (Petromyzon marinus) in the laboratory
Lee H. Hanson
1985, Journal of Great Lakes Research (11) 549-551
Forty-five sets of separate, normal twins were produced from four portions of the eggs from one female sea lamprey (Petromyzon marinus) each fertilized by a different male. The percentage of twinning in the different groups of embryos ranged from 1.0 to...
Improving waterfowl production estimates: Results of a test in the prairie pothole region
P.M. Arnold, L.M. Cowardin
1985, International Congress of Game Biologists (17) 859-865
The U.S. Fish and Wildlife Service in an effort to improve and standardize methods for estimating waterfowl production tested a new technique in the four-county Arrowwood Wetland Management District (WMD) for three years (1982-1984). On 14 randomly selected 10.36 km2 plots, upland and wetland habitat was mapped, classified, and digitized....
Fat deposition and usage by arctic-nesting sandhill cranes during spring
Gary L. Krapu, G.C. Iverson, K. J. Reinecke, C.M. Boise
1985, The Auk (102) 362-368
Body weight, fat, and protein levels of arctic-nesting Sandhill Cranes (Grus canadensis) were measured at several locations during spring migration and on the breeding grounds. Body weights of adult males and females increased by about 34% (1,129 g) and 30% (953 g) from early March at the Platte River to...
Regional setting and new information on some critical geologic features of the West Shasta district, California
J. P. Albers, J.H.C. Bain
1985, Economic Geology (80) 2072-2091
The West Shasta massive sulfide district is in the easternmost of a series of accreted island-arc and oceanic crust terranes that comprise the Klamath Mountains. A sequence of submarine volcanic rocks of predominantly Early Devonian age is the principal component of the island-arc terrane in which the sulfide deposits are...
Correlations among hydrocarbon microseepage, soil chemistry, and uptake of micronutrients by plants, Bell Creek oil field, Montana
S.S. Roeming, T.J. Donovan
1985, Journal of Geochemical Exploration (23) 139-162
Chelate-extractable iron and manganese concentrations in soils over and around the Bell Creek oil field suggest that compared to low average background values, there are moderate amounts of these elements directly over the production area and higher concentrations distributed in an...
An evaluation of temperature scales for silica diagenesis in diatomaceous sequences including a new approach based on the Miocene Monterey Formation, California
M.A. Keller, C.M. Isaacs
1985, Geo-Marine Letters (5) 31-35
Geologic relations indicate that silica phases transformed in the Monterey Formation in two zones that persist over a narrow depth/temperature range and do not stratigraphically overlap. The wide and overlapping range of reported temperatures of these transformations is mainly a result of the many uncertainties inherent in the different methods...
Regional magnetotelluric surveys in hydrocarbon exploration, Parana Basin, Brazil
William D. Stanley, Antonio Roberto Saad Roberto, Walter Ohofugi
1985, American Association of Petroleum Geologists Bulletin (69) 346-360
The magnetotelluric geophysical method has been used effectively as a hydrocarbon exploration tool in the intracratonic Parana basin of South America. The Parana basin has an area of about 1,200,000 km2 (463,000 mi2), extending over portions of Brazil, Paraguay, Uruguay, Argentina, and Bolivia. The Paleozoic marine sedimentary rocks in the Parana...
GELIFICATION OF WOOD DURING COALIFICATION.
Patrick G. Hatcher, Lisa A. Romankiw, John R. Evans
1985, Conference Paper
Coalified wood was examined by SEM and CPMAS**1**3C NMR to delineate chemical and physical alterations responsible for gelification. Early coalification selectively degrades cellulosic components, preserving lignin-like components that are eventually transformed to coal. Cellular morphology persists until the chemical composition becomes uniform, at which point the cells coalesce under compaction...
Redescription of Bellerophon bittneri (Gastropoda: Triassic) from Wyoming.
E. L. Yochelson, D.W. Boyd, B. Wardlaw
1985, Contributions to Geology - University of Wyoming, Laramie (23) 99-104
Bellerophon bittneri Newell and Kummel is an Early Triassic bellerophontacean from the Dinwoody Formation in the Wind River Mountains. The available type material consists of one fair, but incomplete, external mold, which resembles a Bellerophon but is actually a Retispira. After repeated search, additional specimens were found at one locality...
Modeling the rate-controlled sorption of hexavalent chromium
D.B. Grove, Kenneth G. Stollenwerk
1985, Water Resources Research (21) 1703-1709
Sorption of chromium VI on the iron-oxide- and hydroxide-coated surface of alluvial material was numerically simulated with rate-controlled reactions. Reaction kinetics and diffusional processes, in the form of film, pore, and particle diffusion, were simulated and compared with experimental results. The use of empirically calculated rate coefficients for diffusion through...
Physiography and deposition on a distal deep-sea system: The Valencia Fan (Northwestern Mediterranean)
A. Maldonado, A. Palanques, B. Alonso, K.A. Kastens, C.H. Nelson, S. O'Connell, William B. F. Ryan
1985, Geo-Marine Letters (5) 157-164
The Valencia Fan developed as the distal fill of a deep-sea valley, detached from the continental slope and the main sedimentary source. A survey of side-scan sonar, Sea Beam and reflection seismics shows that the sediment is largely fed through the Valencia Valley. The upper fan comprises large channels with...
Increased benthic grazing: An alternative explanation for low phytoplankton biomass in northern San Francisco Bay during the 1976-1977 drought
F.H. Nichols
1985, Estuarine, Coastal and Shelf Science (21) 379-388
Among the consequences of extremely low river flow into northern San Francisco Bay during a two-year drought were (1) a gradual increase in salinity, (2) an unusual decline in chlorophyll a concentration, and (3) the upstream migration of estuarine benthic invertebrates to the normally brackish area of the bay. Total abundance in...
Isotopic studies of the late Archean plutonic rocks of the Wind River Range, Wyoming
J. S. Stuckless, C. E. Hedge, R. G. Worl, K. R. Simmons, Ignatius T. Nkomo, D. B. Wenner
1985, Geological Society of America Bulletin (96) 850-860
Isotopic studies of the Rb-Sr and U-Th-Pb systems in whole-rock samples and the U-Pb systematics for zircons document the existence of two late Arehean intrusive events in the Wind River Range. All of the systems examined indicate an age of ∼2,630 ± 20...
xygen isotope, aeromagnetic, and gravity anomalies associated with hydrothermally altered zones in the Yankee Fork mining district, Custer County, Idaho
R.E. Criss, D.E. Champion, D. H. McIntyre
1985, Economic Geology (80) 1277-1296
Epithermal Ag-Au vein and disseminated deposits in the Yankee Fork district are hosted in altered volcanic rocks having low delta 18 O values, low magnetic susceptibilities, low remanent magnetizations, and relatively high densities. These isotopic and physical quantities provide sensitive indices of rock alteration that can be contoured over areas that are...
