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- School of Natural Resources: Dissertations, Theses, and Student Research (8)
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Articles 1 - 20 of 20
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The Effects Of Wet Meadow Fragmentation On Grassland Birds, Christopher J. Helzer
The Effects Of Wet Meadow Fragmentation On Grassland Birds, Christopher J. Helzer
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Histomorphological Responses Of Red Shiner (Cyprinella Lutrensis) To Atrazine, Terbufos, And Their Mixture, Ibrahim A. Messaad
Histomorphological Responses Of Red Shiner (Cyprinella Lutrensis) To Atrazine, Terbufos, And Their Mixture, Ibrahim A. Messaad
School of Natural Resources: Dissertations, Theses, and Student Research
Alterations of normal histomorphology of fish tissues, behavior, and thermal tolerance are recognized by environmental toxicologists and fish biologists as powerful tools indicating diverse biochemical and physiological changes. Toxicity of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine), terbufos (S-(((1,1-dimethyl-ethyl)thio)methyl)O,O-diethyl phosphorodithioate), and their mixture to red shiner (Cyprinella lutrensis) at 23$\sp\circ$C and 30$\sp\circ$C was investigated in 14-d bioassays after 14-d acclimation. During the bioassays, fish behavior, indications of toxicosis, and external anomalies were observed. After the bioassays, the critical thermal maximum (CTM) was determined. Fish also were preserved for examinations of gill, liver, and kidney tissues using scanning electron microscopy (SEM) and light microscopy (LM). SEM …
Propogation Of Juniperus For Conservation Plantings In The Great Plains, Scott Allen Lee
Propogation Of Juniperus For Conservation Plantings In The Great Plains, Scott Allen Lee
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
The Biology Of Alewife Alosa Pseudoharengus In Lake Ogallala, Nebraska, Eric A. Laux
The Biology Of Alewife Alosa Pseudoharengus In Lake Ogallala, Nebraska, Eric A. Laux
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Improving The Validation Of Model-Simulated Crop Yield Response To Climate Change: An Application To The Epic Model* Jour. Ser. No. 11339 Nebraska Ag. Res. Div., William E. Easterling, Xiafen Chen, Cynthia Hays, James R, Brandle, Hehui Zang
Improving The Validation Of Model-Simulated Crop Yield Response To Climate Change: An Application To The Epic Model* Jour. Ser. No. 11339 Nebraska Ag. Res. Div., William E. Easterling, Xiafen Chen, Cynthia Hays, James R, Brandle, Hehui Zang
School of Natural Resources: Faculty Publications
Crop models have been used extensively to simulate yield response to various scenarios of climate change. Such simulations have been inadequately validated, limiting their utility in policy analysis. In this research, it is argued that the performance of crop models during recent years of extreme weather conditions relative to current normals may give a better indication of the validity of model simulations of crop yields in response to climate change than performance during the full range of climate conditions (as is done now). Twenty years of the climate record (1971-1990) are separated into different growing season temperature and precipitation classes …
Chronic Effects Of Baseflow Levels Of Atrazine On Platte River Algae, Karen J. Nelson
Chronic Effects Of Baseflow Levels Of Atrazine On Platte River Algae, Karen J. Nelson
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Influence Of Prey Availability On Walleye (Stizostedion Vitreum), Mark T. Porath
Influence Of Prey Availability On Walleye (Stizostedion Vitreum), Mark T. Porath
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Growth And Yield Of Snap Beans (Phaseolus Vulgaris L.) As Affected By Shelterbelts And Planting Dates, Mohd Nazip Suratman
Growth And Yield Of Snap Beans (Phaseolus Vulgaris L.) As Affected By Shelterbelts And Planting Dates, Mohd Nazip Suratman
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Thermal Tolerances Of Platte River Fishes: Field And Laboratory Studies, Brett P. Fessell
Thermal Tolerances Of Platte River Fishes: Field And Laboratory Studies, Brett P. Fessell
School of Natural Resources: Dissertations, Theses, and Student Research
No abstract provided.
Surface Exchange Of Water Vapour Between An Open Sphagnum Fen And The Atmosphere, S. B. Verma
Surface Exchange Of Water Vapour Between An Open Sphagnum Fen And The Atmosphere, S. B. Verma
School of Natural Resources: Faculty Publications
No abstract provided.
Conifer Shoot Bidirectional Scattering: Methodology And Preliminary Results, E.A. Walter-Shea, M.A. Mesarch
Conifer Shoot Bidirectional Scattering: Methodology And Preliminary Results, E.A. Walter-Shea, M.A. Mesarch
School of Natural Resources: Faculty Publications
No abstract provided.
The Local Effect Of Intermittency On The Inertial Subrange Energy Spectrum Of The Atmospheric Surface Layer, Jozsef Szilagyi, Gabriel G. Katul, Marc B. Parlange, John D. Albertson, Anthony T. Cahill
The Local Effect Of Intermittency On The Inertial Subrange Energy Spectrum Of The Atmospheric Surface Layer, Jozsef Szilagyi, Gabriel G. Katul, Marc B. Parlange, John D. Albertson, Anthony T. Cahill
School of Natural Resources: Faculty Publications
No abstract provided.
Climatic And Hydrologic Oscillations In The Owens Lake Basin And Adjacent Sierra Nevada, California, Larry Benson, James W. Burdett, Michaele Kashgarian, Steve Lund, Fred Phillips, Robert O. Rye
Climatic And Hydrologic Oscillations In The Owens Lake Basin And Adjacent Sierra Nevada, California, Larry Benson, James W. Burdett, Michaele Kashgarian, Steve Lund, Fred Phillips, Robert O. Rye
United States Geological Survey: Staff Publications
Oxygen isotope and total inorganic carbon values of cored sediments from the Owens Lake basin, California, indicate that Owens Lake overflowed most of the time between 52,500 and 12,500 carbon-14 (14C) years before present (B.P.). Owens Lake desicated during or after Heinrich event H1 and was hydrologically closed during Heinrich event H2. The magnetic susceptibility and organiz carbon content of cored sediments indicate that about 19 Sierra Nevada glaciations occurred between 52,500 and 23,500 14C years B.P.
Egg Development In A High-Density Black Crappie (Pomoxis Nigromacuiatus) Population, Kevin L. Pope, Wade T. Geraets, David W. Willis
Egg Development In A High-Density Black Crappie (Pomoxis Nigromacuiatus) Population, Kevin L. Pope, Wade T. Geraets, David W. Willis
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Female black crappie (Pomoxis nigromaculatus) were collected from Richmond Lake, South Dakota" and egg-diameter frequencies were examined to document spawning strategy during 1994. Two hundred and sixteen adult females [mean total length (TL) ±SE = 204 ± 1 mm] were collected and 85,572 egg diameters were measured. Female black crappie gonadosomatic-index (GSI) values exceeded 8% from 18 May to 22 June 1994, and the density of larval black crappie caught with an ichthyoplankton net peaked on 8 June 1994. The GSI values and larval catches indicated that the population, as a whole, had a single extended spawn from …
Effects Of Red Imported Fire Ants On Northern Bobwhite Chicks, William M. Giuliano, Craig R. Allen, R. Scott Lutz, Stephen Demarais
Effects Of Red Imported Fire Ants On Northern Bobwhite Chicks, William M. Giuliano, Craig R. Allen, R. Scott Lutz, Stephen Demarais
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Populations of red imported fire ants (RIFA; Solenopsis invtcta) have spread rapidly throughout the southeastern United States. RIFA, directly or indirectly, negatively affect many wildlife species, and northern bobwhite (Colinus virginianus) appear to be particularly susceptible. We examined the effect of exposure to different numbers of RIFA for 15 and 60 seconds on body mass and survival of captive northern bobwhite chicks. Compared to unexposed birds, survival of chicks was reduced with exposure to as few as 50 RIFA for 60 seconds, or 200 RIFA for 15 seconds, and body mass was lower in chicks exposed to …
Seasonal Influences On Freshwater Fisheries Sampling Data, Kevin L. Pope, David W. Willis
Seasonal Influences On Freshwater Fisheries Sampling Data, Kevin L. Pope, David W. Willis
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Fisheries managers often assess fish populations using catch per unit effort (CPUE), size and age structure, growth, and condition. For many freshwater fishes and common sampling gears, CPUE, size and age structure, and condition are highest in the spring and fall, while growth commonly is fastest during the summer growing season. However, there are exceptions to these general trends, especially in populations with erratic recruitment, growth, or mortality. At the least, CPUE, size and age structure, growth, and condition of fish should be expected to change with season, given the effects of variable recruitment, growth, and mortality. However, if recruitment, …
An Assessment Of Burbot (Lota Iota) Weight - Length Data From North American Populations, Shannon J. Fisher, David W. Willis, Kevin L. Pope
An Assessment Of Burbot (Lota Iota) Weight - Length Data From North American Populations, Shannon J. Fisher, David W. Willis, Kevin L. Pope
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
Declining buroot (Lola lola) abundance across some portions of North America has prompted a search for additional evaluation tools, including a measure of condition. Weight - length data were compiled for 10293 burbot from 79 North American populations. These data were used to develop a 75th percentile standard weight (W,) equation using the regression-line-percentile technique. The proposed equation is log10 W3 = - 4.868 + 2.898 log10 TL, where Ws is the standard weight in grams, and TL is the maximum total length in millimetres. The equation is valid for burbot ≥20 cm and …
Origin Of The Late Quaternary Dune Fields Of Northeastern Colorado, Daniel R. Muhs, Thomas W. Stafford, Scott D. Cowherd, Shannon A. Mahan, Rolf Kihl, Paula B. Maat, Charles A. Bush, Jennifer Nehring
Origin Of The Late Quaternary Dune Fields Of Northeastern Colorado, Daniel R. Muhs, Thomas W. Stafford, Scott D. Cowherd, Shannon A. Mahan, Rolf Kihl, Paula B. Maat, Charles A. Bush, Jennifer Nehring
United States Geological Survey: Staff Publications
Stabilized eolian deposits, mostly parabolic dunes and sand sheets, cover much of the landscape of northeastern Colorado and adjacent parts of southwestern Nebraska in four geographically distinct dune fields. Stratigraphic and soil-geomorphic relations and accelerator radiocarbon dating indicate that at least three episodes of eolian sand movement occurred between 27 ka and 11 ka. possibly between 11 ka and 4 ka. and within the past 1.5 ka. Thus, eolian sand deposition took place under both glacial and interglacial climatic conditions. In the youngest episodes of eolian sand movement. Holocene parabolic dunes partially buried Pleistocene sand sheet deposits.
Late Holocene sands …
Csrees Department Of Forestry, Fisheries & Wildlife Comprehensive Review, University Of Nebraska - Lincoln
Csrees Department Of Forestry, Fisheries & Wildlife Comprehensive Review, University Of Nebraska - Lincoln
School of Natural Resources: Documents and Reviews
No abstract provided.
Scale Issues In Soil Moisture Modelling: Problems And Prospects, Rezaul Mahmood
Scale Issues In Soil Moisture Modelling: Problems And Prospects, Rezaul Mahmood
School of Natural Resources: Faculty Publications
Soil moisture storage is an important component of the hydrological cycle and plays a key role in land-surface-atmosphere interaction. The soil-moisture storage equation in this study considers precipitation as an input and soil moisture as a residual term for runoff and evapotranspiration. A number of models have been developed to estimate soil moisture storage and the components of the soil-moisture storage equation. A detailed discussion of the implication of the scale of application of these models reports that it is not possible to extrapolate processes and their estimates from the small to the large scale. It is also noted that …