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Pollen Collectors And Other Insect Visitors To Penstemon Haydenii S. Wats., H. Randy Lawson, V. J. Tepedino, T. L. Griswold

Proceedings of the North American Prairie Conferences

Records of insects visiting the flowers of Penstemon haydenii (S. Wats.) are supplied. The flower-visitor fauna was different at the two sites censused. Primary pollinators appeared to be four species of megachilid bees which consistently visited the flowers for pollen. While bees exhibited high fidelity to flowers of the genus Penstemon, analysis of the pollen carried by females suggests that crossing over between Penstemon species on a particular foraging trip may be common. Opportunities for interspecific hybridization almost certainly occur.

Plant Species Composition And Groundwater Levels In A Platte River Wet Meadow, Paul J. Currier

Proceedings of the North American Prairie Conferences

Species composition was monitored in seven permanent exclosures at Mormon Island Crane Meadows, near Grand Island, Nebraska from 1982 to 1987. Crane meadows is a 1,050 ha (2,600 acre) native lowland prairie complex with a corrugated topography of wetland swales and dry sand ridges. Variable precipitation, periodic over-bank flooding, and river stage fluctuations complicate the system's hydrology. In general, springs are wet, but, by late summer, the meadows are usually dry, closely paralleling river flows and precipitation patterns. A sustained high water period in 1983 and 1984 was responsible for major changes in species abundance. Plant responses were consistent with …

Phenology Of Native Angiosperms Of South Padre Island, Texas, Robert I. Lonard, Frank W. Judd

Proceedings of the North American Prairie Conferences

Flowering and fruiting patterns for 74 species of native angiospenns were studied on South Padre Island, Texas, from May 1984 to May 1986. Four patterns were recognized: 1) a continuous cycle of flowering and fruiting; 2) a cycle limited to spring through autumn; 3) a two season regime, either spring-summer or summer-fall; and 4) a cycle completed in one season or less (spring or fall). Marked year-to-year variation occurred in flowering and fruiting responses within individual species. Only one-fifth ofthe species exhibited the same monthly patterns in successive years. Number of species in flower or fruit was significantly correlated with …

Manitoba's Tall-Grass Prairie Conservation Project, Joanne Joyce, John P. Morgan

Proceedings of the North American Prairie Conferences

Manitoba's tall grass prairies mark the northernmost extent of that community in North America and historically comprised the most extensive area of tallgrass prairie in Canada. The Tall-Grass Prairie Conservation Project is Manitoba's first systematic inventory of this community. Potential sites were located using black-and-white aerial photography, land-use maps, and referrals from outside sources. Sites were systematically ground-checked and ranked using native species dominance, abundance and diversity, evidence of disturbance, and location. About 19% (116,600 ha) of the historic range of the true prairie was surveyed between May and October of 1987; an additional 23% (138,000 ha) was surveyed between …

Inventory, Assessment, And Ranking Of Natural Areas Of Walpole Island, P. Allen Woodliffe

Proceedings of the North American Prairie Conferences

A two-year study was begun in 1985 to document and assess the highly significant natural history features of the Walpole Island Indian Reserve in southwestern Ontario, Canada. The northern part of the island complex, where extensive prairie, savannah, and hardwood communities remain, was divided into 30 areas. The southern part, consisting of agricultural lands and wetlands was not examined. Through intensive field study and literature search, over 800 vascular plant species have been recorded from Walpole. Of the total, 12% (97) are rare in Ontario, and 1 % (8) are not known elsewhere in Canada. Ninety-two species of birds have …

Fungus Disease In Relation To Managing Prairie Plants With Fire, Judy F. Shearer, Lois H. Tiffany

Proceedings of the North American Prairie Conferences

Specific fungal foliar diseases were assessed on selected prairie plant species in relation to fire as a management practice on Hayden Prairie Preserve, Iowa. Selected plant species in burned and unburned areas were visually inspected and rated for presence and severity of specific fungal diseases at three sampling times in July and September 1987 and in June 1988. Less disease and lower disease severity ratings were recorded on plants in burned areas except for powdery mildew on Canada tickclover [Desmodium canadense (L.) DC.]. Increasing amounts of disease developed on plants in the areas unburned for one and two years.

Extent Of Woody Vegetation On The Prairie In Eastern Nebraska, 1855-1857, Steven J. Rothenberger

Proceedings of the North American Prairie Conferences

Early surveyors' notes from five counties bordering the Platte River in eastern Nebraska were utilized to measure the extent of original woody vegetation in this region. These data were compared to field studies from the same area made from 1979-1983, were used to determine areas of prairie-forest transition, and were used to tabulate the extent of woody vegetation in the lower Platte River Valley at the time of European settlement (1855-1857). Using a modified importance value based on relative density and relative dominance of witness trees, the highest ranking pre-settlement tree species were cottonwood [Populus eltoides Marsh. spp. monilifera …

Establishment Of Grasses On Sewage Sludge-Amended Strip Mine Spoils, Cassandra S. Rodgers, Roger C. Anderson

Proceedings of the North American Prairie Conferences

Usefulness of native prairie and domesticated grasses in re-vegetating strip mine spoil and producing biomass was examined on 30-year old, recontoured spoil banks located near Canton, Illinois. Grasses were planted in the spring and fall on strip mine spoil and spoil amended with 333 MT/ha of dry sewage sludge. By the end of the second growing season, indiangrass [Sorghastrum nutans (L.) Nash] produced more biomass than the other warm-season grasses, switchgrass (Panicum virgatum L.) and little bluestem [Schizachyrium scoparium (Michx.) Nash], on the unamended plots, and no warm-season grasses survived on the sludge amended plots. Warm-season grasses were …

The Western Prairie Fringed Orchid (Platanthera Praeclara): Monitoringa And Research, Ardell J. Bjugstad, William Fortune

Proceedings of the North American Prairie Conferences

Western prairie fringed orchid (Platanthera praeciara Sheviak and Bowles) populations at one time extended from southwestern Missouri north to northwestern Minnesota, and from eastern Iowa to the Sandhills of north central Nebraska. It is listed as endangered in Iowa and Minnesota and candidate for threatened or endangered status in Kansas, Missouri, Nebraska, North Dakota, Oklahoma, and South Dakota. The questions are, "Why has it declined in numbers?" How have uses such as mowing for hay or grazing by cattle or no use (control) affected the numbers? In 1987, permanently located individual plants were counted on the Sheyenne National Grasslands …

The Vegetation History Of Hempstead Plains, New York, Richard Stalter, Wayne Seyfert

Proceedings of the North American Prairie Conferences

Hempstead Plains, once encompassing 24,282 hectares, originally extended from western Suffolk County, to eastern Queens County, Long Island, New York. Hicks (1892), Harper (1918), Ferguson (1925), Cain et al. (1937), and Seyfert (1972), contended that Hempstead Plains was always devoid of arboreous growth, though Bailey (1949) maintained that shrubs and trees grew on the Plains. Those who have made important vegetation studies of the Plains included Hicks (1892), Harper (1918), Ferguson (1925), Conard (1935), Seyfert (1972), and Stalter and Lamont (1987). Stalter and Lamont (1987) studied a 8.5 ha remnant in the vicinity of Mitchell Field and found little bluestem …

Energetic Electron Tracks And Dna Strand Breaks, A. Chatterjee, W. R. Holley

United States Department of Energy: Publications

A theoretical model with no adjustable parameters is presented to evaluate the strand break yields for incident electrons between 100 eV and 1 MeV. Indirect mechanisms as well as direct mechanisms are included for the production of strand breaks. The model includes the following features: (i) multiple scattering of low energy electrons; (ii) decay of hydroxyl radicals in an aqueous solution containing Tris buffer; (iii) Monte Carlo simulation of the motion of hydroxyl radicals for interaction with the DNA sites; and (iv) stochastic aspects of the direct ionization on the DNA sites and the use of oscillator strength of a …

The Katz Cell-Survival Model And Beams Of Heavy Charged Particles, Stanley B. Curtis

United States Department of Energy: Publications

In this paper, we describe how the Katz cell-survival model has been used to predict survival along the central axis of the dose vs depth curve of beams of heavy charged particles. Unmodified beams with sharp Bragg peaks as well as ridge-filter-modulated beams with spread Bragg peaks have been studied. The analysis in terms of this model leads to the definition of two coefficients, "ion kill" and "gamma kill", which characterize the radiation quality of the beams. In this way, the relative importance of the primary lind secondary (fragmentation) contributions can be assessed easily.

Setting the model parameter m equal …

Physical Aspects Of Charged Particle Track Structure, R. H. Ritchie, R. N. Hamm, J. E. Turner, H. A. Wright, J. C. Ashley, G. J. Banks

United States Department of Energy: Publications

A plasmon generated by a swift charged particle constitutes a coherent excitation about the particle track. We discuss the physics of the plasmon in condensed matter and its effects on electron transport in liquid water. Criteria for the existence of the plasmon III a given substance, Its characteristics when generated by a swift charged particle, its representation in impact parameter space, and its decay into localized excitations are described. We describe how plasmon excitation and decay are implemented in our Monte Carlo code, OREC, and how track structure calculations are affected by this mode.

Subsurface Transport Of Contaminants, John E. Mccarthy, John M. Zachara

United States Department of Energy: Publications

Contaminants originating from human activities have entered the subsurface environment through waste disposal practices, spills, and land application of chemicals. The establishment of effective disposal and isolation procedures for chemical wastes, the protection of public health, and the amelioration of subsurface contamination rely on the ability to predict the velocity at which contaminants move through the vadose (unsaturated) and saturated zones. However, attempts to describe and predict contaminant transport cannot succeed if major pathways and mechanisms for transport are not defined.

Most approaches to describing and predicting the movement of contaminants treat groundwater as a two-phase system in which contaminants …

Survey And Reconnaissance Of Sea Turtles In The Northern Gulf Of Mexico, Larry Ogren

United States Department of Commerce: Staff Publications

This is a report on the results of an aerial survey of nesting beaches conducted during the period from May 16, 1977 to August 11, 1977. The area covered included the barrier beaches and offshore islands from the Florida-Alabama state line to the Rio Grande, Texas. Additional historical information is provided in order to compare current nesting activity with previous years as well as anecdotal observations on the occurrence of sea turtles in this region.

The Plight Of The ‘Forgotten’ Whales, Robert L. Brownell Jr., Katherine Ralls, William F. Perrin

United States Department of Commerce: Staff Publications

The “Save the Whales” movement, the most successful wildlife crusade in history, has greatly influenced government policies in a number of countries, including the United States. Thanks in large part to the movement’s dedicated members, the fight to save the great whales has been largely won. Yet all but ignored in this victory has been the plight of smaller cetaceans, which continues to worsen.

From The Gulf To The Rio Grande: Human Adaptation In Central, South, And Lower Pecos Texas, Thomas Hester, Stephen L. Black, D. Gentry Steele, Ben W. Olive, Anne A. Fox, Karl Reinhard, Leland C. Bement

Karl Reinhard Publications

The South Texas area, Region 3 of the Southwestern Division, U.S. Army Corps of Engineers, is synthesized from archeological and bioarcheological perspectives. Three distinct geographic units within Region 3 are treated in detail: Central Texas Plateau Prairie, South Texas Plains, and Lower Pecos Canyonlands. More than 11,000 years of human adaptation are chronicled for this area, stretching from the Gulf of Mexico to the Rio Grande along the border with northeastern Mexico. Particular attention is devoted to a consideration of the region's prehistoric record; significant problems and data gaps are outlined. For the first time, a compilation has been done …

A User's Guide To The Jekyll Island Environment, Lion Gardiner

Professional and Organizational Development Network in Higher Education: Conference Materials

The Marsh

The Terrestrial Vegetation

Birds

Mammals

Beach Plants

Animals of the Beach and Ocean

Exploring Further

The Okefenokee Swamp

Safety for People and Environment

Sources of Additional Information

Equipment

Assessment Answer Key

Tide Table

Ec89-1509 1989 Insect Management Guide : Corn And Sorghum, S. D. Danielson, F. P. Baxendale, R. J. Wright

University of Nebraska-Lincoln Extension: Historical Materials

Extension circular 89-1509 is about field crop insect management guide for Nebraska corn and sorghum.

G89-951 Mushrooms, Puffballs, Fairy Rings, And Slime Molds In Turfgrass, John E. Watkins

University of Nebraska-Lincoln Extension: Historical Materials

How do you identify -- and treat -- mushrooms, puffballs, fairy rings and slime molds? Read on.

Some mushrooms and most puffballs are edible; some are foul-smelling, many are considered unsightly, and a few are poisonous; but when they appear on a lawn, most are considered a nuisance.

G89-907 Drinking Water: Testing For Quality (Revised April 2005), Sharon Skipton, Bruce I. Dvorak, Wayne Woldt

University of Nebraska-Lincoln Extension: Historical Materials

Why test water quality? Concern about water quality often leads consumers to ask questions such as "What is in my water?" or "Is my drinking water safe?" All water from natural sources contains dissolved substances. These substances are often called contaminants, especially when the amounts present are at possibly harmful or problematic levels. The substances in water can result from either natural processes or human activities. At low concentrations, many do not cause known harmful effects and may be beneficial. Research shows some substances may be harmful only when present at high enough concentrations. The only way to know if …

1989 Nebraska Swine Report

Nebraska Swine Reports

1989 Nebraska Swine Report

Pflanzenarten Der Mvr Als Quelle Biologisch Aktiver Verbindungen, L. M. Belenovskaja, L. P. Marakova, T. P. Nadežina, G. A. Kuznecova, V. S. Sinickij

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Es wurde der Gehalt an Flavonoiden und Kumarinen von 250 Pflanzenarten, die zu 38 Gattungen, 35 Familien der Flora der \ MVR gehören. untersucht. Bei 50 Arten der Familien Asteraceae, Fabaceae, Lamiaceae wurde ein beträchtlicher Gehalt an Flavoiden festgestellt. Kumarine sind für 60 Arten (17 Familien) nachgewiesen. Ausführlich wurde die Zusammensetzung der Flavonoidc für einzelne Arten der Familie Asteraceae und die der Kumarine für Arten der Familie .Apiaceae untersucht. Es wurden für die Gewinnung biologisch aktiver Flavonoide und Kumarine aussichtsreiche Pflanzenarten gefunden, die die Grundlage für die Herstellung originaler Arzneimittel von einem breiten Wirkungsspektrum bilden können.

Untersucht wurde auljerdem die …

G89-932 Minimum Center Pivot Design Capacities In Nebraska, William L. Kranz, Derrel L. Martin, Greg Lackas

University of Nebraska-Lincoln Extension: Historical Materials

Factors to consider in choosing an appropriate center pivot design are covered here. Irrigators investing in a center pivot irrigation system need to consider this important question: How much supplemental water is required by the crop? Irrigation system capacity needed to meet crop requirements is defined in units of gallons per minute (GPM) or gallons per minute per acre (GPM/AC). If the system capacity is too low, crop stress occurs during some portion of the growing season. If the capacity is too high, surface runoff may result, or capital investment for the pumping plant and center pivot may be greater …

Effects Of Track Structure On Neutron Microdosimetry And Nanodosimetry, Randall S. Caswell

United States Department of Commerce: Staff Publications

The process by which neutrons transfer their energy to tissue is described, including the deposition of energy by secondary charged particle tracks in small sites; that is, microdosimetry and nanodosimetry. Three approximations are considered in order of increasing amounts of information on track structure: the continuous slowing-down approximation (CSDA), the straggling approximation, and the delta-ray approximation. Although simple approximations sometimes work quite well, much work remains to be done for very small sites, and for the inclusion of the effects of "passers" in the calculations.

Early Childhood Special Education In The Next Decade: The Impact Of Public Law 99-457 In Nebraska, Deana Finkler, Cordelia Robinson

Center for Public Affairs Research (UNO): Publications

Nebraska has served handicapped children from birth to age 21 through special education and other services since 1978. But in 1991 Public Law 99-457 will include federal funding for preschool services and incentive grants for infants and toddlers. Because Nebraska has already been serving these populations, it will not receive new funds under the new law. States that will be taking advantage of the incentive funds will be looking to Nebraska-and other states with experience in serving handicapped infants and preschoolers-for precedence. Although under P.L. 99-457 policy has been set at the federal level, key state policy considerations remain. These …

Ec89-1761 Poisonous Snakes And Snakebite In Nebraska, Ron J. Johnson

University of Nebraska-Lincoln Extension: Historical Materials

Nebraska has four kinds of venomous snakes — the prairie rattlesnake, timber rattlesnake, western massasauga (a small rattlesnake), and copperhead. Knowing how to identify venomous snakes, especially the kinds found in areas where you might go, is a good first step in avoiding them.

This publication provides information about Nebraska's venomous snakes, some guidelines for avoiding snakebite, and suggestions on what to do in case of snakebite.

Balancing Endangered Species Protection And Irrigation Water Rights: The Platte River Cooperative Agreement, J. David Aiken

Department of Agricultural Economics: Faculty Publications

This article discusses Platte basin water right disputes involving endangered species, the development of the Platte Cooperative Agreement as a method for resolving such conflicts, and the framework within which such conflicts will now be addressed.

North American Cuterebrid Myiasis Report Of Seventeen New Infections Of Human Beings And Review Of The Disease, J. Kevin Baird, Craig R. Baird, Curtis W. Sabrosky

United States Public Health Resources

Human infection with botfly larvae (Cuterebra species) are reported, and 54 cases are reviewed. Biologic, epidemiologic, clinical, histopathologic, and diagnostic features of North American cuterebrid myiasis are described. A cuterebrid maggot generally causes a single furuncular nodule. Most cases occur in children in the northeastern United States or the Pacific Northwest; however, exceptions are common. Most lesions of North American cuterebrid myiasis are caused by second or third instar Cuterebra maggots that appear in late August, September, and October. First instar maggots are unusual and occur in the vitreous humor or in the upper respiratory tract of patients in …

Toxin Genotypes And Plasmid Profiles As Determinants Of Systemic Sequelae In Escherichia Coli 0157:H7 Infections, Stephen Ostroff, Phillip Tarr, Marguerite A. Neill, Jay H. Lewi, Nancy Hargrett-Bean, John M. Kobayashi

United States Public Health Resources

In 1987, 93 Escherichia coli 0157:H7 isolates were collected during routine surveillance for this pathogen in the state of Washington. Toxin genotypes and plasmid profiles were correlated with the clinical sequelae of illness in 88 of the 93 patients from whom these strains were isolated. Thirteen plasmid patterns were observed among the 88 tested isolates; four patterns accounted for 82(7o of the isolates. Genetic probing for Shiga-like toxins (SLT) I and II demonstrated the presence of both genes in 67 (76%), SLT I alone in three (3%), and SLT II alone in 18 (20%). The hemolytic uremic syndrome or throm-botic …