Seasonal bathythermal distribution of juvenile lake trout in Lake Ontario
Joseph H. Elrod, Clifford P. Schneider
1987, Journal of Great Lakes Research (13) 121-134
Bathythermal distributions of hatchery-reared lake trout (Salvelinus namaycush) of three genetic strains (Lake Superior; Clearwater Lake, Manitoba; and Seneca Lake, New York) were described from catches with bottom trawls in Lake Ontario during April-May, June, July-August, and October, 1978–1984. This work was part of a program to evaluate post-stocking performance...
GEOGRAPHIC ESTIMATION OF RUNOFF-MODEL PARAMETERS.
Arthur R. Schmidt, Linda S. Weiss, Kevin A. Oberg
1987, Conference Paper
The U. S. Geological Survey is developing techniques to estimate and evaluate unit-hydrograph and loss-rate parameter values for rainfall-runoff models using Geographic Information System (GIS) procedures. The data base includes basin, soil, and climatological characteristics that will be stored in a GIS, and unit-hydrograph and loss-rate parameters obtained from calibration...
Lake Superior revisited 1984
Wayne R. MacCallum, James H. Selgeby
1987, Canadian Journal of Fisheries and Aquatic Sciences (44) 23-36
The Lake Superior fish community has changed substantially since the early 1960s, when control of the sea lamprey (Petromyzon marinus) became effective. Self-reproducing stocks of lake trout (Salvelinus namaycush) have been reestablished in many inshore areas, although they have not yet reached pre-sea lamprey abundance; offshore lake trout are probably...
Acid rain stimulation of Lake Michigan phytoplankton growth
Bruce A. Manny, G.L. Fahnenstiel, W.S. Gardner
1987, Journal of Great Lakes Research (13) 218-223
Three laboratory experiments demonstrated that additions of rainwater to epilimnetic lake water collected in southeastern Lake Michigan stimulated chlorophyll a production more than did additions of reagent-grade water during incubations of 12 to 20 d. Chlorophyll a production did not begin until 3–5 d after the rain and lake water were mixed. The stimulation...
Prey fish dynamics and salmonine predator growth in Lake Ontario, 1978-84
Robert O’Gorman, Roger A. Bergstedt, Thomas H. Eckert
1987, Canadian Journal of Fisheries and Aquatic Sciences (44) 390-403
The size of hatchery-reared brown trout (Salmo trutta) and coho salmon (Oncorhynchus kisutch), 1 yr after release in Lake Ontario, declined when the stocking of salmonines was increased between 1978 and 1984. The principal prey species, alewife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax), failed to show the expected, predator-induced downturn...
Dispersal of three strains of hatchery-reared lake trout in Lake Ontario
Joseph H. Elrod
1987, Journal of Great Lakes Research (13) 157-167
Rates of dispersal and resultant geographical distributions were determined for three strains of hatchery-reared lake trout (Salvelinus namaycush) stocked at six sites in U.S. waters of Lake Ontario. The strains were Lake Superior (SUP); Clearwater Lake, Manitoba (CWL); and Seneca Lake,...
Yield and dynamics of destabilized chub (Coregonus spp.) populations in Lakes Michigan and Huron, 1950-84
Edward H. Brown Jr., Ray L. Argyle, N. Robert Payne, Mark E. Holey
1987, Canadian Journal of Fisheries and Aquatic Sciences (44) 371-383
Deepwater ciscoes (Coregonus spp.) or 'chubs' of Lake Michigan far surpassed those of Lake Huron in yield, population density, and resilience following severe depletion in the 1960s and 1970s, when the bloater (C. hoyi) composed more than 90% of the stocks. The population decline of bloaters in recent decades was...
Meeting future information needs for Great Lakes fisheries management
W.J. Christie, John J. Collins, Gary W. Eck, Chris I. Goddard, John M. Hoenig, Mark Holey, Lawrence D. Jacobson, Wayne MacCallum, Stephen J. Nepszy, Robert O’Gorman, James Selgeby
1987, Canadian Journal of Fisheries and Aquatic Sciences (44) 439-447
Description of information needs for management of Great Lakes fisheries is complicated by recent changes in biology and management of the Great Lakes, development of new analytical methodologies, and a transition in management from a traditional unispecies approach to a multispecies/community approach. A number of general problems with the collection...
Unusual larval habitats and life history of chironomid (Diptera) genera
Patrick L. Hudson
1987, Entomologica Scandinavica Supplements (29) 369-373
Ninety-three genera, representing all subfamilies of Chironomidae, are organized into 9 categories of unusual habitats or life history including hygropetric, riparian (bank, floodplain, upland), hyporheic, symbiotic, and intertidal; others live in water held in plants or mine into unusual substrates. In riparian zones precise location of optimum habitat is difficult...
Thermal and dissolved oxygen characteristics of a South Carolina cooling reservoir
James L. Oliver, Patrick L. Hudson
1987, Water Resources Bulletin (23) 257-269
Temperature and dissolved oxygen concentrations were measured monthly from January 1971 to December 1982 at 1-m depth intervals at 13 stations in Keowee Reservoir in order to characterize spatial and temporal changes associated with operation of the Oconee Nuclear Station. The reservoir water column was i to 4°C warmer in...
Implications of the northwestwardly younger age of the volcanic rocks of west-central California: Alternative Interpretation
Richard G. Stanley
1987, GSA Bulletin (98) 612-614
Fox and others (1985) have made an important contribution to our understanding of iihe evolution of the Mendocino triple junction and the San Andreas transform. They have summarized a large amount of data on the ages and distribution of volcanic centers along the central California coast; their summary clearly shows...
Horizontal ichthyoplankton tow-net system with unobstructed net opening
Robert T. Nester
1987, North American Journal of Fisheries Management (7) 148-150
The larval fish sampler described here consists of a modified bridle, frame, and net system with an obstruction-free net opening and is small enough for use on boats 10 m or less in length. The tow net features a square net frame attached to a 0.5-m-diameter cylinder-on-cone plankton net...
Dynamics of the recovery of the western Lake Erie walleye (Stizostedion vitreum vitreum) stock
Richard W. Hatch, Stephen J. Nepszy, Kenneth M. Muth, Carl T. Baker
1987, Canadian Journal of Fisheries and Aquatic Sciences (44) 15-22
After its 1957 collapse under intensive fishing and environmental stresses, the walleye (Stizostedion vitreum vitreum) stock of western Lake Erie remained low throughout the 1960s. A moratorium on both sport and commercial fishing, resulting from the 1970 discovery of mercury concentrations in walleye flesh, provided an opportunity for the development...
Relation of long- and short-term atmospheric sulfur concentrations to sulfate deposition in New York State
C.R. Barnes
1987, Northeastern Environmental Science (6) 89-98
Records from 1965-80 indicate an annual decrease of 1.9% in sulfur dioxide emissions upwind of New York, an annual decrease of 1.5% in atmospheric particulate sulfate concentration in New York, and an annual decrease of 2.0% in sulfate-deposition rate in New York. Sulfate-deposition rates in bulk sampling in New York...
Nongame bird communities on managed grasslands in North Dakota
Rochelle B. Renken, James J. Dinsmore
1987, Canadian Field-Naturalist (101) 551-557
Grazed native prairie, unmanipulated native prairie, and planted alfalfa-wheatgrass habitats each supported prairie bird species unique to that habitat type. Comparisons of the three habitats, using community coefficients and overlap indices, showed that grazed and alfalfa-wheatgrass habitats supported the most dissimilar or unique bird communities. All three habitat types, or...
Ground-water levels in the lower Paleozoic and Precambrian crystalline rocks, southeastern Chester County, Pennsylvania, July and August 1986
John A. Garges
1987, Water-Resources Investigations Report 86-4352
A water table contour map of the lower Paleozoic and Precambrian crystalline rocks of southeastern Chester County, Pennsylvania was constructed on the basis of water levels measured in 261 wells in July and August 1986, elevations of 11 springs that were flowing in July and August 1986, and water levels...
Origin of the lethal gas burst from Lake Monoun, Cameroun
Haraldur Sigurdsson, J.D. Devine, F.M. Tchua, F.M. Presser, M.K.W. Pringle, William C. Evans
1987, Journal of Volcanology and Geothermal Research (31) 1-16
On 15 August, 1984, a lethal gas burst issued from a submerged 96-m-deep crater in Lake Monoun in Cameroun, western Africa, killing 37 people. The event was associated with a landslide from the eastern crater rim, which slumped into deep water. Waters below 50 m are anoxic, dominated by high...
Endocrine events associated with spawning behavior in the sea lamprey (Petromyzon marinus)
Jane E. Linville, Lee H. Hanson, Stacia A. Sower
1987, Hormones and Behavior (21) 105-117
Levels of estradiol, progesterone, and testosterone were determined in plasma of sea lamprey (Petromyzon marinus) undergoing certain behaviors associated with spawning in natural and artifical stream environments. Significantly higher levels of estradiol, progesterone, and testosterone were found in males than in females. In the artifical spawning channel, levels of estradiol...
The Vizcaino Block of the Mendocino triple junction, Northern California
D. S. McCulloch
1987, Conference Paper, Tecton ics, sedimentation and evolution of the Eel River and associated coastal basins of Northern California: Proceedings of a symposium
No abstract available...
Alaska interim land cover mapping program
Water Resources Division, U.S. Geological Survey
1987, Data Users Guide 7
In order to meet the requirements of the Alaska National Interest Lands Conservation Act (ANILCA) for comprehensive resource and management plans from all major land management agencies in Alaska, the USGS has begun a program to classify land cover for the entire State using Landsat digital data. Vegetation and land...
Paint chip poisoning of Laysan albatross at Midway Atoll
L. Sileo, S.I. Fefer
1987, Journal of Wildlife Diseases (23) 432-437
Epizootic mortality occurred in Laysan albatross (Diomedea immutabilis) fledgings at Midway Atoll in 1983. Heavy metal toxicity from ingestion of weathered paint chips was one of the causes. Sick albatrosses were unable to retract their wings, causing a 'droop-wing' appearance. Five normal and 12 droop-winged fledglings were captured, killed, and...
Some effects of climate variability on hydrology in western North America
D. H. Peterson, D.R. Cayan, J. S. Dileo-Stevens, T.G. Ross
1987, Conference Paper, The influence of climate change and climatic variability on the hydrologic regime and water resources (Proceedings of the Vancouver Symposium, August 1987), IAHS Publication no. 168
The strong north-south gradient in precipitation along the West Coast makes this region an interesting laboratory for studying the influence of climate on runoff variability in general and riverine chemistry in particular. Interannual fluctuations in large-scale atmospheric circulation and associated precipitation and runoff can produce major disruptions in the "average"...
A model for trace metal sorption processes at the calcite surface: Adsorption of Cd2+ and subsequent solid solution formation
J.A. Davis, C. C. Fuller, A.D. Cook
1987, Geochimica et Cosmochimica Acta (51) 1477-1490
The rate of Cd2+ sorption by calcite was determined as a function of pH and Mg2+ in aqueous solutions saturated with respect to calcite but undersaturated with respect to CdCO3. The sorption is characterized by two reaction steps, with the first reaching completion within 24 hours. The second step proceeded...
Relationship between peat geochemistry and depositional environments, Cranberry Island, Maine
R. Raymond Jr., C. C. Cameron, A.D. Cohen
1987, International Journal of Coal Geology (8) 175-187
The Heath, Great Cranberry Island, Maine, offers a unique locality for studying lateral and vertical relationships between radically different peat types within 1 km2. The majority of The Heath is a Sphagnum moss-dominated raised bog. Surrounding the raised bog is a swamp/marsh complex...
Computer graphics for quality control in the INAA of geological samples
J. N. Grossman, P. A. Baedecker
1987, Journal of Radioanalytical and Nuclear Chemistry Articles (113) 43-59
A data reduction system for the routine instrumental activation analysis of samples is described, with particular emphasis on interactive graphics capabilities for evaluating analytical quality. Graphics procedures have been developed to interactively control the analysis of selected photopeaks during spectral analysis, and to evaluate detector performance during a given counting...
