Comparison of three nonlinear models to describe long-term tag shedding by lake trout
Mary C. Fabrizio, Bruce L. Swanson, Stephen T. Schram, Michael H. Hoff
1996, Transactions of the American Fisheries Society (125) 261-273
We estimated long-term tag-shedding rates for lake trout Salvelinus namaycush using two existing models and a model we developed to account for the observed permanence of some tags. Because tag design changed over the course of the study, we examined tag-shedding rates for three types of numbered anchor tags (Floy tags FD-67,...
The influence of spatial patterns of landcover and use on hydrological and ecosystem dynamics at the mountain plains interface in the Central United States
Jill Baron, D. S. Ojima, M.D. Hartman, Timothy G.F. Kittel, R.B. Lammers, L. Band, R. A. Pielke
1996, Conference Paper, Proceedings of IGBP/BAHC-LUCC Joints Inter-Core Projects Symposium
No abstract available....
Predation on ruffe by native fishes of the St. Louis River Estuary, Lake Superior, 1989-1991
Derek H. Ogle, James H. Selgeby, Jacqueline F. Savino, Raymond M. Newman, Mary G. Henry
1996, North American Journal of Fisheries Management (16) 115-123
The ruffe Gymnocephalus cernuus, an exotic Eurasian percid, recently became established in the St. Louis River estuary, Lake Superior, after accidental introduction. Management actions (catch regulations and stockings) were enacted in 1989 to increase the density of top-level predators in the estuary, and thus to increase predation on ruffe. We conducted...
Myxobolus cognati n. sp. (Myxosporea) from the opercular integument of Cottus cognatus (Cottidae) in Lake Michigan
David K. Cone, Richard Greg Stickel, Gary W. Eck, Patrick M. Muzzall
1996, Journal of Parasitology (82) 137-139
A myxosporean producing aggregations of white pseudocysts in skin covering the posterior margin of the operculum and perioral tissue of Cottus cognatus in Lake Michigan is described as Myxobolus cognati n. sp. (Myxosporea). Histological sections revealed that the parasite develops in vascularized regions of the dermis and with development protrudes...
Recovery of burrowing mayflies (Ephemeroptera: Ephemeridae: Hexagenia) in western Lake Erie
Kenneth A. Krieger, Don W. Schloesser, Bruce A. Manny, Carmen E. Trisler, Susan E. Heady, Jan J.H. Ciborowski, Kenneth M. Muth
1996, Journal of Great Lakes Research (22) 254-263
Burrowing mayflies (Hexagenia spp.) are native to western Lake Erie and were abundant until the 1950s, when they disappeared due to degraded water and sediment quality. Nymphs were absent from the sediments of most of western Lake Erie after the 1950s, although small, widely disjunct populations apparently persisted near shore. Sediment...
Variations in the reproductive cycle of Dreissena polymorpha in Europe, Russia, and North America
Susan Jerrine Nichols
1996, American Zoologist (36) 311-325
The reproductive cycle of the zebra mussel {Dreissena polymorpha) is highly variable throughout its range in Europe, Russia, and North America. The environmental factors influencing this variation are poorly understood, but successful reproduction is occurring in areas where it was initially believed that adult zebra mussels could not survive (i.e.,...
Geomagnetic storms, the Dst ring-current myth and lognormal distributions
W.H. Campbell
1996, Journal of Atmospheric and Terrestrial Physics (58) 1171-1187
The definition of geomagnetic storms dates back to the turn of the century when researchers recognized the unique shape of the H-component field change upon averaging storms recorded at low latitude observatories. A generally accepted modeling of the storm field sources as a magnetospheric ring current was settled about 30...
The impacts of mobile fishing gear on seafloor habitats in the Gulf of Maine (Northwest Atlantic): Implications for conservation of fish populations
P.J. Auster, R.J. Malatesta, R.W. Langton, Les Watling, P. C. Valentine, C.L.S. Donaldson, E.W. Langton, A.N. Shepard, Ivar G. Babb
1996, Reviews in Fisheries Science (4) 185-202
Fishing gear alters seafloor habitats, but the extent of these alterations, and their effects, have not been quantified extensively in the northwest Atlantic. Understanding the extent of these impacts, and their effects on populations of living marine resources, is needed to properly manage current and future levels of fishing effort...
A preliminary evaluation of sediment quality assessment values for freshwater ecosystems
Sherri L. Smith, Donald D. MacDonald, Karen A. Keenleyside, Christopher G. Ingersoll, L. Jay Field
1996, Journal of Great Lakes Research (22) 624-638
Sediment quality assessment values were developed using a weight of evidence approach in which matching biological and chemical data from numerous modelling, laboratory, and field studies performed on freshwater sediments were compiled and analyzed. Two assessment values (a threshold effect level (TEL) and a probable effect level(PEL)) were derived for...
Behavioral studies of contaminant effects on aquatic invertebrates: A review of Russian investigations
V. A. Nepomnyashchikh, V. A. DeLonay, E. E. Little
D. S. Henshel, David A. Bengston, editor(s)
1996, Book chapter
Studies by Russian scientists have documented significant alterations and impairment of critical behavioral functions in aquatic organisms following exposure to environmental contaminants. Behavioral responses disrupted by sublethal exposure to toxicants are intimately involved in habitat selection, foraging, competition, predator-prey relationships, and reproduction, and are essential to...
Regionalization of annual precipitation maxima in Montana
Charles Parrett
Housner G.W.Chung R.M., editor(s)
1996, Conference Paper, Proceedings of the Conference on Natural Disaster Reduction
Precipitation depth estimation methods based on dimensionless precipitation-frequency curves were developed for 2-, 6-,and 24-hour storm durations for three homogeneous regions in Montana. Data from 402 daily and hourly precipitation stations and 54 daily precipitation stations were analyzed using the methods to form a database of the regions' annual precipitation...
Source parameters controlling the generation and propagation of potential local tsunamis along the cascadia margin
Eric L. Geist, Shoichi Yoshioka
1996, Natural Hazards (13) 151-177
The largest uncertainty in assessing hazards from local tsunamis along the Cascadia margin is estimating the possible earthquake source parameters. We investigate which source parameters exert the largest influence on tsunami generation and determine how each parameter affects the amplitude of the local tsunami. The following source parameters were analyzed:...
Evidence for the correlation of the upper part of the Llewellyn Formation (Pennsylvania Anthracite region), with the Monongahela Formation
J.R. Eggleston, C. Wnuk, W.E. Edmunds
1996, Northeastern Geology and Environmental Sciences (18) 230-236
A plant fossil assemblage from the roof shale of the No. 25 anthracite bed in Pennsylvania indicates that the upper part of the Llewellyn Formation is much younger than the lower part of the Allegheny Group or Conemaugh Group correlation that was indicated by Read and Mamay (1960). These results...
Acute toxicity of fire control chemicals to Daphnia magna(Straus) and Selenastrum capricornutum(Printz)
Susan F. McDonald, Steven J. Hamilton, Kevin J. Buhl, James F. Heisinger
1996, Ecotoxicology and Environmental Safety (33) 62-72
Acute toxicity tests were conducted exposingDaphnia magnaStraus (daphnid) in soft and hard reconstituted waters (hardness 42 and 162 mg/liter as CaCO3, respectively), andSelenastrum capricornutumPrintz (algae) in ASTM algal assay medium (hardness 15 mg/liter as CaCO3) to fire retardants Fire-Trol GTS-R, Fire-Trol LCG-R, and Phos-Chek D75-F, and foam suppressants Phos-Chek WD-881...
A two-step experimental design for a sediment bioassay using growth of the amphipod Hyalella azteca for the test end point
Jody A. Kubitz, John M. Besser, John P. Giesy
1996, Environmental Toxicology and Chemistry (15) 1783-1792
We designed a sediment bioassay using 25% growth inhibition of Hyalella azteca as the end point.Hyalella azteca exhibits size-specific fecundity, so growth is a surrogate of reproductive production. We investigated density effects on growth to address whether crowding could affect test interpretation; amphipods in 14,000/m2 exposures were 16 to 20%...
Calculation of earthquake rupture histories using a hybrid global search algorithm: Application to the 1992 Landers, California, earthquake
S. Hartzell, P. Liu
1996, Physics of the Earth and Planetary Interiors (95) 79-99
A method is presented for the simultaneous calculation of slip amplitudes and rupture times for a finite fault using a hybrid global search algorithm. The method we use combines simulated annealing with the downhill simplex method to produce a more efficient search algorithm then either of the two constituent parts....
Food habits of diving ducks in the Great Lakes after the zebra mussel invasion
Christine M. Custer, T. W. Custer
1996, Journal of Field Ornithology (67) 86-99
Zebra mussels (Dreissena polymorpha) invaded the Great Lakes in the mid-1980s and quickly reached high densities. The objective of this study was to determine current consumption of zebra mussels by waterfowl in the Great Lakes region. Feeding Lesser Scaups (Aythya affinis), Greater Scaups (A. marila), Canvasbacks (A. valisineria), Redheads (A....
Marsh vertical accretion in a Southern California Estuary, U.S.A
Donald R. Cahoon, J.C. Lynch, A.N. Powell
1996, Estuarine, Coastal and Shelf Science (43) 19-32
Vertical accretion was measured between October 1992 and March 1994 in low and high saltmarsh zones in the north arm of Tijuana estuary from feldspar market horizons and soil corings. Accretion in the Spartina foliosa low marsh (2-8.5 cm) was related almost entirely to episodic storm-induced river flows between January...
Interaction of flooding and salinity stress on baldcypress (Taxodium distichum)
J. A. Allen, S. R. Pezeshki, J. L. Chambers
1996, Tree Physiology (16) 307-313
Coastal wetlands of the southeastern United States are threatened by increases in flooding and salinity as a result of both natural processes and man-induced hydrologic alterations. Furthermore, global climate change scenarios suggest that, as a consequence of rising sea levels, much larger areas of coastal wetlands may be affected by...
Unrealistic parameter estimates in inverse modelling: A problem or a benefit for model calibration?
E. P. Poeter, M. C. Hill
1996, IAHS-AISH Publication (237) 277-285
Estimation of unrealistic parameter values by inverse modelling is useful for constructed model discrimination. This utility is demonstrated using the three-dimensional, groundwater flow inverse model MODFLOWP to estimate parameters in a simple synthetic model where the true conditions and character of the errors are completely known. When a poorly constructed...
Nest initiation and clutch size of great blue herons on the Mississippi River in relation to the 1993 flood
T. W. Custer, R. K. Hines, Christine M. Custer
1996, Condor (98) 181-188
Great Blue Heron (Ardea herodias) eggs were collected from ten colonies between Clinton, Iowa and Royalton, Minnesota on the Mississippi River in 1993, a year of record floods in the midwestern United States. In the live southernmost colonies where record flooding occurred, Great Blue Herons initiated nesting two weeks later...
Exposure of wild waterfowl to Mycoplasma anatis
M.D. Samuel, Diana R. Goldberg, C. B. Thomas, P. Sharp, J.R. Robb, Gary L. Krapu, B.N. Nersessian, K.P. Kenow, C. E. Korschgen, W.H. Chipley, M.J. Conroy
1996, Journal of Wildlife Diseases (32) 331-337
We developed an ELISA procedure to assess the presence of M. Anatis-specific serum antibody in ducks. Sera from exposed and unexposed Pekin ducks (Anas platyrhynchos) were used to standardize tile ELISA and to establish reference ranges to classify ELISA results as exposed or not exposed. We conducted serological surveys of...
A model of Precambrian geology of Kansas derived from gravity and magnetic data
J. Xia, D.R. Sprowl, D.W. Steeples
1996, Computers & Geosciences (22) 883-895
The fabric of the Precambrian geology of Kansas is revealed through inversion of gravity and magnetic data to pseudo-lithology. There are five main steps in the inversion process: (1) reduction of potential-field data to a horizontal plane in the wavenumber domain; (2) separation of the residual anomaly of interest from...
Simultaneous confidence intervals for a steady-state leaky aquifer groundwater flow model
S. Christensen, R.L. Cooley
1996, IAHS-AISH Publication (237) 561-569
Using the optimization method of Vecchia & Cooley (1987), nonlinear Scheffe??-type confidence intervals were calculated tor the parameters and the simulated heads of a steady-state groundwater flow model covering 450 km2 of a leaky aquifer. The nonlinear confidence intervals are compared to corresponding linear intervals. As suggested by the significant...
The Eocene Big Timber stock, south-central Montana: Development of extensive compositional variation in an arc-related intrusion by side-wall crystallization and cumulate glomerocryst remixing
du Bray, S. S. Harlan
1996, Geological Society of America Bulletin (108) 1404-1424
The Eocene Big Timber stock in the Crazy Mountains of south-central Montana is an elliptical, 8 by 13 km, compositionally and texturally diverse composite intrusion with a well-developed radial dike swarm. A sharp intrusive contact separates its two phases: the core of the intrusion is fine-grained quartz monzodiorite, and the...
