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Articles 50761 - 50790 of 52389
Full-Text Articles in Physical Sciences and Mathematics
Physical Survey Of The Lake Michigan College-Ross Property, Van Buren County, Michigan As An Environmental Resource, Raymond C. Levesque
Physical Survey Of The Lake Michigan College-Ross Property, Van Buren County, Michigan As An Environmental Resource, Raymond C. Levesque
Masters Theses
No abstract provided.
Water Resources News, Volume 5, No. 6, June 1973
Water Resources News, Volume 5, No. 6, June 1973
Water Current Newsletter
From the Desk of the Director
Deadlines for Research Proposals
Dr. Stanton Ware Visits
Regional Research Workshop
Summer Institutes at the University of Nebraska
Seminar Proceedings Available
Nitrogen in Nebraska's Environment
National Water Commission Report Issued
Water Pollution Control Research Fellowships
State Environmental Center Measure Revived
HR 5464 Approved by House
The Prairie Naturalist Volume 5, No.2. June 1973
The Prairie Naturalist Volume 5, No.2. June 1973
The Prairie Naturalist
SOME ASPECTS OF MINK-WATERFOWL RELATIONSHIPS ON PRAIRIE WETLANDS ▪ Robert T. Eberhardt
SUMMER AND FALL FOODS OF MINK ON THE J. CLARK SALYER NATIONAL WILDLIFE REFUGE ▪ Wayne F. Cowan and James R. Reilly
GIANT CANADA GEESE ▪ S. O. Kolstoe
SOME LICHENS OF BOG AND PAPER BIRCH FROM NORTH DAKOTA ▪ Dennis T. Disrud and Thomas D. Trana
A PALEOCENE FOSSIL LOCALITY IN SOUTHEASTERN SASKATCHEWAN: THE SHORT CREEK SECTION ▪ Paul L. Broughton
NOTE: A new orchid for North Dakota ▪ Robert E. Stewart
Channel Improvements, New London, Connecticut: A Case Study, E. L. Gallup
Channel Improvements, New London, Connecticut: A Case Study, E. L. Gallup
Marine Affairs Theses and Major Papers
The U.S. Army Corps of Engineers is one of the largest single Federal agencies involved in the planning, design and construction of public waterborne transportation facilities. A critical review of a typical corps of Engineers survey report on the improvements to a harbor should provide an insight to the means of allocating the costs and benefits resulting from government expenditures. The purpose of this paper is to review this process using as a vehicle the proposed improvements to the navigation channel at New London, Connecticut
Chemical Quality Of The Groundwater System In Hall County, Nebraska, Jon C. Atkinson
Chemical Quality Of The Groundwater System In Hall County, Nebraska, Jon C. Atkinson
Department of Earth and Atmospheric Sciences: Dissertations, Theses, and Student Research
Hall County, an area of 540 square miles, is in south-central Nebraska. The Platte River flows east-northeasterly across the county from its southwest corner; the Wood River, which is tributary to the Platte within Hall County, enters the county about 6 miles north of the southwest corner. Analysis of streamflow data indicates that the Platte and Wood Rivers are losing streams in Hall County. Based on an 18-year period, October 1953 through September 1971, the average annual losses between gaging stations were 48,100 and 1,940 acre-feet, respectively.
The county is underlain by unconsolidated deposits of Quaternary age. These deposits mantle …
Water Resources News, Volume 5, No. 5, May 1973
Water Resources News, Volume 5, No. 5, May 1973
Water Current Newsletter
From the Desk of the Director
Deadline for Matching Grants Proposals
Institute Activities
Summer Institutes Announced at the University of Nebraska
Increasing Irrigation Efficiency
Black Hills Sciences Field Station
Construction or Destruction?
Low Flood Losses
Center for Environmental Studies
Earth Tremor Control Method
New Commission of Reclamation
Irrigation Considered Low Priority
Salinity Control Bill
Streams Rich in Mineral Content
Who Done It?
Drastic Mineral Depletions Noted
EPA Ordered to Release $6 Billion
Water Prospects in the West
Field Measurements Of Photosynthesis And Leaf Growth Rates Of Three Alpine Plant Species, Douglas A. Johnson
Field Measurements Of Photosynthesis And Leaf Growth Rates Of Three Alpine Plant Species, Douglas A. Johnson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Leaf photosynthetic measurements using a portable 14Co2 field system were carried out and correlative leaf relative growth rates, RGR, were determined at different leaf positions of three alpine plant species throughout the growing season. Initially there was a period of high leaf RGR associated with a period of increasing photosynthetic activity. Following this stage was a long period of no net change in length of the living leaf. During this period, photosynthetic activity generally increased to a maximum level and then decreased steadily. The final ontogenetic stage was a period of negative leaf RGR denoting leaf senescence which …
Mechanisms Of Population Regulation In Confined Colonies Of Peromyscus Maniculatus (Wagner) And The Response To Exploitation, Donna Corn Olsen
Mechanisms Of Population Regulation In Confined Colonies Of Peromyscus Maniculatus (Wagner) And The Response To Exploitation, Donna Corn Olsen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Wild-trapped and laboratory-reared Peromyscus maniculatus (Wagner) were raised as confined colonies indoors with various stocking densities ranging from 0.026 to 0.100 mice per sq. ft. in pens of 40, 77, and 154 sq. ft. The animals were individually tagged and all pens were censused at weekly or semi-monthly intervals to record animals present, body weights, food consumption, and overt reproductive condition. At the termination of each experiment, all mice were necropsied and organ weights of gonads and adrenals recorded. Histological sections were made of the testes and ovaries. Half the colonies were subjected to density-independent exploitation by removal of 50% …
The Relationship Of Climatic Factors To Grazing Activities Of Cows On Winter And Spring Ranges, Benton M. Smith
The Relationship Of Climatic Factors To Grazing Activities Of Cows On Winter And Spring Ranges, Benton M. Smith
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this research was to investigate the effects of climatic variations upon the daily activities of grazing cattle. The activities of individual cows on a partially seeded salt desert shrub range were observed and recorded during three grazing periods. Two of the periods were during consecutive winters and the other during the spring. Climatic variations during the second winter period were quantified and compared to changes in the daily activity patterns of the cattle.
Distinctly different daily routines of cattle activities were evident for the winter and spring seasons. In the spring, the cattle grazed, traveled, and drank …
Habitat Selection By Large Wild Ungulates And Some Aspects Of The Energy Flow In A Sub-Tropical African Savanna Woodland Ecosystem, Stanley M. Hirst
Habitat Selection By Large Wild Ungulates And Some Aspects Of The Energy Flow In A Sub-Tropical African Savanna Woodland Ecosystem, Stanley M. Hirst
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A study of habitat selection by large wild ungulates was carried out on a 50 cm2 area in the sub-tropical Lowveld region of eastern Transvaal province, South Africa. Estimations were made of herbaceous forage net productivity and ungulate secondary productivity on the same area.
Fourteen vegetation types, varying in composition and structure from open savanna to dense woodland, were delineated by association analysis. Structural and vegetational characteristics which were considered to influence ungulate distribution were measured within each vegetation type.
The study area supported resident populations of seven ungulate species during the wet season; drv season densities were higher …
The Foods And Feeding Habits Of Botulism Intoxicated And Healthy Waterbirds On The Bear River Refuge, Utah With Emphasis On The American Avocet And Blacknecked Stilt, George W. Wilson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Primary objectives of this study were: (1) to compare the food habits of healthy and botulism intoxicated American avocets and blacknecked stilts for qualitative and quantitative differences, (2) to determine which invertebrates found in the tracts of intoxicated and healthy birds contained type C toxin, and (3) to explain apparent susceptibilities among different sexes, ages and species of birds.
Based on percent utilization and occurrence of food items in the esophagus, the diets of healthy and intoxicated birds were similar. However, intoxicated avocets consumed higher proportions of Gastropoda and intoxicated stilts more Hydrophilidae larvae than did healthy birds. Because of …
A Comparison Of Consumer's Surplus And Monopoly Revenue Estimates Of Recreational Value For Two Utah Waterfowl Marshes, C. Holden Brink
A Comparison Of Consumer's Surplus And Monopoly Revenue Estimates Of Recreational Value For Two Utah Waterfowl Marshes, C. Holden Brink
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Demand curves were estimated for waterfowl hunting and nonconsumptive recreational use from use rate and variable expenditure data collected at the Bear River Migratory Bird Refuge and the Farmington Bay Waterfowl Management Area during fiscal 1969. Consumer's surplus and monopoly revenue estimates were then derived from the demand functions. Adjusted estimates of consumer's surplus for waterfowl hunting amounted to $7,260 per year at Bear River and $11,400 per year at Farmington Bay. For nonconsumptive recreation annual consumer's surplus was estimated to be $18,700 at Bear River and $3,760 at Farmington Bay. Monopoly revenue estimates were between one-half and one-fourth the …
Reproduction In The Red Squirrel (Tamiasciurus Hudsonicus) In Colorado, Richard A. Dolbeer
Reproduction In The Red Squirrel (Tamiasciurus Hudsonicus) In Colorado, Richard A. Dolbeer
United States Department of Agriculture Wildlife Services: Staff Publications
Information on reproduction of the red squirrel (Tamiasciumrs hudsonicus) can be gleaned from studies in the northeastern United States (Klugh, 1927; Hamilton, 1939; Layne, 1954) and in western Canada (Miller, 1970; Smith, 1968; Kemp and Keith, 1971; Wood, 1967). However, there is a paucity of information on reproduction from the mountainous regions of the western United States. This paper presents reproductive information on the red squirrel from Colorado and helps fill this void. In addition, the reproductive strategy of red squirrels is briefly compared with that of snowshoe hares.
A Regional Perspective For Coastal Zone Management In New England, Susan Holliday Anderson
A Regional Perspective For Coastal Zone Management In New England, Susan Holliday Anderson
Marine Affairs Theses and Major Papers
To emphasize the need for a regional perspective of the coastal zone in effective planning in New England, the characteristics that make New England a distinct marine region and the use conflicts that are specific to this region are explored in the discussion that follows.The extent to which the New England states have developed coastal zone management, both in incremental local and state practice and through comprehensive plans, is also discussed. Within New England, there are regional organizations that provide assistance and guidance in matters relating to the coastal zone, but to date, most of their efforts have been directed …
Elements Of Tanzanian Coastal Planning, James J. Griffin
Elements Of Tanzanian Coastal Planning, James J. Griffin
Marine Affairs Theses and Major Papers
The purpose of this paper is to examine aspects of a Coastal Zone Plan as it applies to the Republic of Tanzania with its differences from and similarities to, the United States coastal zone planning experience. Possibly, as a result, some feeling for the problem of organizational concepts and approaches, as well as the current need for Tanzanian coastal zone management will emerge.
Comprehensive Land Use Planning: Its Development And Potential Impact On Coastal Zone Management, Raymond A. Siuta
Comprehensive Land Use Planning: Its Development And Potential Impact On Coastal Zone Management, Raymond A. Siuta
Marine Affairs Theses and Major Papers
Presently, the United States is in the midst of a "revolution" concerning the management and use regulation of its land resources. This peaceful "revolution" is occurring as a consequence of local government's inability to properly enforce land use controls and to adequately cope with rapid land development. However, this paper in discussing land use controls comments only on those comprehensive efforts directly affecting the coastal zone or indirectly affecting it through all-inclusive land manage regulations. This narrow discussion should not indicate to the reader that specific land use proposals have not been introduce for impact on other physiographic regions.
The Federal Waste Water Treatment System Construction Grant Program: What It Requires Of States And How It Works, L. C. Leopold
The Federal Waste Water Treatment System Construction Grant Program: What It Requires Of States And How It Works, L. C. Leopold
Marine Affairs Theses and Major Papers
This paper is the result of a study conducted to inform the author as to how the Environmental Protection Agency (EPA) relates to state and intrastate programs that deal with waste water treatment systems in a coastal state. The investigation centered on how EPA actually manages its functions and assistance directed towards state-level and local-level efforts to control sewage treatment facilities. The study was not limited only to the federal-to-state-flow dynamics. It also looked at areas of purely state function, state-to-local flow, and also the opposite situation of local-to-sate-to-federal oriented inputs.
Trout Movements In A Small Mountain Stream, Thomas Mark Twedt
Trout Movements In A Small Mountain Stream, Thomas Mark Twedt
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Five groups of 400 hatchery rainbow trout, (Salmo gairdneri), were stocked in a small, mountain stream at 3-week intervals from June to September, 1972. A fish trap captured any fish moving out of a 500 m study section.
Fish began moving at high levels during the first day of each stocking and continued at high rates for 5-8 days (Early Phase), after which movement decreased to low levels for 6-9 days (Late Phase). Early Phase fish moved primarily at night, possibly due to their disoriented state and high subjectivity to stream conditions. Fish moving during Late Phase did …
Distillation-Condensation Of Water And Nutrient Movement In A Desert Ecosystem, N. Stark
Distillation-Condensation Of Water And Nutrient Movement In A Desert Ecosystem, N. Stark
Memorandum
No abstract provided.
Nitrogen And Carbon Flux In A Soil-Vegetation Complex In The Desert Biome, D. B. Porcella, J. E. Fletcher, D. L. Sorensen, G. C. Pidge, A. Dogan
Nitrogen And Carbon Flux In A Soil-Vegetation Complex In The Desert Biome, D. B. Porcella, J. E. Fletcher, D. L. Sorensen, G. C. Pidge, A. Dogan
Memorandum
No abstract provided.
Gaseous Losses Of Nitrogen From The Soil Of Semi-Arid Regions, T. C. Tucker, R. L. Westerman
Gaseous Losses Of Nitrogen From The Soil Of Semi-Arid Regions, T. C. Tucker, R. L. Westerman
Memorandum
No abstract provided.
Proteolytic Activity Of Soil Microorganisms, Robert T. O'Brien
Proteolytic Activity Of Soil Microorganisms, Robert T. O'Brien
Memorandum
No abstract provided.
Predicting Nitrogen Transformations And Ammonia Volatilization In Warm Desert Soils, G. R. Dutt
Predicting Nitrogen Transformations And Ammonia Volatilization In Warm Desert Soils, G. R. Dutt
Memorandum
No abstract provided.
Soil As A Factor In Modelling The Phosphorus Cycle In The Desert Ecosystem, J. J. Jurinak, R. A. Griffin
Soil As A Factor In Modelling The Phosphorus Cycle In The Desert Ecosystem, J. J. Jurinak, R. A. Griffin
Memorandum
No abstract provided.
Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, P. L. Comanor, D. C. Prusso
Decomposition And Mineralization In An Artemisia Tridentata Community In Northern Nevada, P. L. Comanor, D. C. Prusso
Memorandum
No abstract provided.
Seed Reserves Of Desert Soils, Stuart Childs, David W. Goodall
Seed Reserves Of Desert Soils, Stuart Childs, David W. Goodall
Memorandum
No abstract provided.
Effects Of Exercise On Serum Lactate Dehydrogenase Activity Of Catchable-Size Hatchery Rainbow Trout, Salmo Gairdneri, Gerlad T. Klar
Effects Of Exercise On Serum Lactate Dehydrogenase Activity Of Catchable-Size Hatchery Rainbow Trout, Salmo Gairdneri, Gerlad T. Klar
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Effects of exercise and the relative condition of exercised fish were viii evaluated for two strains of rainbow trout. Circular tanks fitted with a paddle were used to continuously exercise the fish and a stamina tunnel was used to evaluate the condition of exercised trout. Trout were exercised continuously at one fish-length per second and one-half fish length per second. Serum LDH activity in Shephard-of-the-Hills (Missouri) rainbow trout acclimated to 10 C increased two fold during the first four days of exercise. Serum LDH activity returned to control levels by the tenth day of exercise. Serum LDH activity in Shephard-of-the-Hills …
Internal Water Potential Of An Engelmann Spruce Stand In Relation To Soil And Atmospheric Factors, Richard L. Meyn
Internal Water Potential Of An Engelmann Spruce Stand In Relation To Soil And Atmospheric Factors, Richard L. Meyn
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The primary objective of this study was to determine the degree of correlation between internal water potential of Engelmann spruce trees and selected environmental factors. The secondary objective of the study was to determine the effect of summer precipitation, both in meadow and forested sites, on the soil drying cycle.
Four study plots (each roughly 154 square meters) under spruce cover and two study plots (100 square meters) in a small meadow were established. At each spruce plot, a thermocouple psychrometer was installed at one meter above the ground on the north side of three selected, mature Engelmann spruce trees. …
Autecological Life History Studies Of Two Geraniums, Geranium Richardsonii And Geranium Nervosum, Becky Lee Green
Autecological Life History Studies Of Two Geraniums, Geranium Richardsonii And Geranium Nervosum, Becky Lee Green
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Two perennial species of wild geranium (Geranium nervosum Rydb. and G. richardsonii Fisch, and Trautv, [Geraniaceae]) which grow throughout the mountainous regions of western North America were studied to determine the factors influencing the life stage development and distribution of these plants. Attempts were also made to provide some information to assist in the taxonomy of this genus.
Geranium richardsonii is found in wet meadows and along streambanks throughout its distribution. Geranium nervosum frequents rocky hillsides and drier meadows throughout its range.
Seeds of G. nervosum had 65%, germination in the stratification pretreatment. Geranium richardsonii seeds required scarification to …
Bromegrass Productivity In Relation To Precipitation, Shrub Canopy Cover And Soil Nitrogen Content, Lawrence G. Kline
Bromegrass Productivity In Relation To Precipitation, Shrub Canopy Cover And Soil Nitrogen Content, Lawrence G. Kline
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
In seasons of above normal precipitation, populations of annual weedy species increase in great abundance in semi-arid desert plant communities. These increases in biomass tie up a considerable portion of the available nitrogen of such ecosystems and may depress subsequent annual grass germination.
A big sagebrush-annual bromegrass plant community was irrigated to simulate a spring growth period of abundant precipitation amenable to annual bromegras s productivity. Productivity and nitrogen content parameters were monitored throughout the spring and summer to evaluate the short and potential long term effects of this seasonal increase in "precipitation".
Irrigation increased annual bromegrass productivity almost 50 …