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Scientific Note: A Case Of Gynandromorphy In Golofa Tersander Burmeister (Coleoptra: Scarabaeidae), Brett C. Ratcliffe

University of Nebraska State Museum: Entomology Papers

Golofa tersander is a sexually dimorphic species with males possessing a long, slender horn arising from the frons, a distinct pronotal tubercle anteriorly, a strongly convex pygidium, and an apically emarginate last sternite. Females, on the other hand, have only a tubercle on the frons, lack a pronotal tubercle, possess a relatively flat pygidium, and the last sternite is entire apically. Both of the specimens described here exhibit all of these external male character states just mentioned.

A New Species Of Pelidnota (Coleoptera: Scarabaeidae: Rutelinae) From Panama, Brett C. Ratcliffe, Mary Liz Jameson

University of Nebraska State Museum: Entomology Papers

Pelidnota hirsutiphallica new species, is described as new from Colon and Bocas del Toro provinces in Panama. It is incorporated into the most recent key to the genus and distinguished from its congeners.

Assessment Of Squirrel-Caused Power Outages, J. Chris Hamilton, Ron J. Johnson, Ronald M. Case, Michael W. Riley

School of Natural Resources: Faculty Publications

Squirrel-caused power outages in Lincoln and Omaha, Nebraska, were evaluated by examining company power outage reports and by consulting with power company representatives. Reports showed that squirrel-caused outages at pole-mounted transformers were most prevalent during May, June, and October (48% of total) and between 1 and 4 h after sunrise (38%), patterns that coincide with squirrel dispersal or morning activity periods. In Lincoln, 1980 and 1981, squirrels caused 177 outages per year, which was 24% of all outages and 90% of animal-caused outages. Estimated minimum annual costs were $23 364 for repairs, public relations, and lost revenue while meters were …

Track “Core” Effects In Heavy Ion Radiolysis, Robert Katz, Guo-Rong Huang

Robert Katz Publications

By assuming that HO₂^● radical production in water and H₂ production in benzene are 2 hit processes, and applying the concepts of track physics, we are able to obtain a parametric fit to the yields of these reactions by heavy ion radiolysis from knowledge of the radial dose distribution about a heavy ion’s path. We make no use of the concept of a track core, for no clearly definable track core appears in our calculations of the radial dose distribution. Instead we calculate an action cross section σ from the assumed 2 hit response to γ-rays. The …

Ec89-259 The Nebraska Poultry Report 1989

University of Nebraska-Lincoln Extension: Historical Materials

Extension circular 89-259 is about the Nebraska poultry report in 1989.

Review Of Radial Dose Measurement Technique And Data, Matesh N. Varma

United States Department of Energy: Publications

Radial dose is the average energy deposited in a short length of cylindrical shell formed between radii r and r + dr, per unit mass. Here, r is the distance perpendicular to the trajectory of an incident charged particle. Radial dose profiles as a function of radial distance for charged particles have been used to interpret radiobiological data. This article reviews the technique for measuring radial dose distributions and the available data.

Ec89-1511 1989 Insect Management Guide : Alfalfa, Soybeans, Wheat, Range And Pasture, S. D. Danielson, F. P. Baxendale, R. J. Wright

University of Nebraska-Lincoln Extension: Historical Materials

Extension circular 88-1511 is about field crop insect management guide for Nebraska alfalfa, soybeans, wheat, range and pasture.

Pod Membership Directory And Networking Guide 1988-89

Professional and Organizational Development Network in Higher Education: Archives

Membership Directory

Members by Location

Members by Institutional Type

G89-904 Corn Insects - Quick Reference, J. F. Witkowski, Frederick P. Baxendale

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide provides abbreviated information on all the economically important corn insect pests found in Nebraska. It provides a brief description, damage symptoms, incidence, sampling scheme, economic thresholds, and available references for these insects.

Ec89-1537 1989 Insect Management Guide : Sugarbeets, Dry Beans, Sunflowers, Vetch, Potatoes, Onion, S. D. Danielson, F. P. Baxendale, R. J. Wright

University of Nebraska-Lincoln Extension: Historical Materials

Extension circular 88-1537 is about field crop insect management guide for – sugarbeets, dry beans, sunflowers, alfalfa seed, vetch, potatoes, and onions.

Leaf Optical And Indirect Lai Measurements In Wheat And Alfalfa At Maciv: Agmet Progress Report 89-4, E. A. Walter-Shea, B. L. Blad

School of Natural Resources: Documents and Reviews

Interpretation of remotely sensed vegetative surfaces requires an understanding of the interaction of radiation with the various components of vegetation. Leaves are the most important component. Thus it is important to know the optical properties of individual leaves as well as the amount and distribution of leaves making up the vegetative cover. The objectives of our study were 1) to characterize the reflectance from and transmittance through adaxial and abaxial surfaces of individual wheat and alfalfa leaves and 2) to compare the traditional, time-consuming, destructive method of estimating LAI (direct method) to a relatively quick, indirect estimate of LAI in …

Atrazine Hazards To Fish, Wildlife, And Invertebrates: A Synoptic Review, Ronald Eisler

United States Fish and Wildlife Service: Publications

The herbicide ·atrazine (2-chloro-4-ethylamino-6-isopropylamino-I,3,5- triazine) is the most heavily used agricultural pesticide in North America. In the United States alone, more than 50 million kg (110 million pounds) are applied annually to more than 25 million ha (62 million acres), primarily to control weeds in corn and sorghum. Residues have been detected at phytotoxic concentrations in groundwater, lakes, and streams as a result of runoff from treated fields. Atrazine degrades rapidly, usually by way of hydrolysis, nitrogen dealkylation, and splitting of the triazine ring to less toxic compounds not normally inhibitory to plants and animals. The half-time persistence of atrazine …

Accumulation Of Lead And Organochiorine Residues In Captive American Kestrels Fed Pine Voles From Apple Orchards, Rey C. Stendell, W. Nelson Beyer, Robert A. Stehn

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

Pine voles (Microtus pinetorum) were collected from pesticide-treated orchards in New York (USA) and fed to three captive American kestrels (Falco sparverius) for 60 days to evaluate potential hazards from soil-borne persistent insecticides. Three control kestrels were fed uncontaminated laboratory mice (Mus musculus). The pine voles contained an average of 38 ppm lead, 48 ppm DDE and 1.2 ppm dieldrin (wet weight). The kestrels accumulated sublethal amounts of lead (1 ppm lead wet weight) in their livers. In contrast, DDE and dieldrin accumulated in the tissues and brains of kestrels to toxicologically significant concentrations. …

Desert Explorations - A Videodisc Exhibit Designed For Flexibility, Judy Diamond, Alan B. Bond, Atsusi Hirumi

Alan Bond Publications

Using an interactive exhibit does not provide the same experience for everyone. How visitors understand an exhibit, what associations it evokes, and even how it is physically utilized may differ widely. This article describes an exhibit that was designed to let visitors tailor their explorations to their own interests and motivation. The exhibit, called Desert Explorations, gives visitors choices of what to see and how to learn about what they see. This exhibit also is an example of a way of developing interactive videodisc exhibits that is relatively inexpensive yet may be tailored to a particular topic or hall. This …

Breeding Bird Populations Of A Floodplain Tallgrass Prairie In Kansas, Calvin Cink, Peter Lowther

Proceedings of the North American Prairie Conferences

Breeding birds were censused yearly from 1974-1988 on a 10.1 ha floodplain tallgrass prairie, a portion of the Baker Wetlands Research Area on the south edge of Lawrence, Kansas. Dickcissels (Spiza americana) were the most abundant species, with densities about six times greater than in the Flint Hills tallgrass prairie (149 territorial males/km² VS. 25/ km²). This may be due to availability of moisture and associated density of grass stems and insect production. The bird community in the floodplain prairie however, is less diverse (5 species VS. 10 species). Grasshopper sparrows (Ammodramus savannarum) …

Bluestem Seed Midge Influence On Sexual Reproduction Of Big Bluestem: A Review, K. P. Vogel, G. R. Manglitz

Proceedings of the North American Prairie Conferences

A Cecidomyiid midge (Contarinia wattsi Gagne') has been identified as a significant parasite of big bluestem [Andropogon gerardii Vitman var. gerardii] by adversely affecting the production of viable seeds. The midge was first identified from specimens collected from big bluestem racemes in 1983 in eastern Nebraska. Subsequent collections and studies have shown that it is widespread in the Great Plains, and that it can reduce seed yields of big bluestem by over 40%. The midges apparently over winter as diapausing larvae in disarticulated spikelets, emerge as adults at the time of early panicle emergence, and lay their …

Blowouts In The Nebraska Sandhills: The Habitat Of Penstemon Haydenii, James Stubbendieck, Theresa R. Flessner, Ronald Weedon

Proceedings of the North American Prairie Conferences

The Nebraska Sandhills is the largest area of sand dunes in the Western Hemisphere, occupying over 5 million ha in northcentral Nebraska. The rolling to steep dunes range in height from a few meters to over 60 m. Soils are poorly developed in wind deposited sand. The continental climate is characterized by 425 to 625 mm of annual precipitation, an average annual temperature of 10 C, and a frost-free period of 130-155 days. Upland vegetation is primarily tall grasses and midgrasses such as sand bluestem [Andropogon gerardii var. paucipilus (Nash) Fern.], prairie sandreed [CaLamovilfa Longifolia (Hook.) Scribn.], little bluestem …

Blowout Penstemon: Description And Present Situation, Joyce Phillips Hardy, Ronald R. Weedon, William R. Bowlin

Proceedings of the North American Prairie Conferences

Blowout penstemon (Penstemon haydenii S. Wats.) appears to be the rarest flowering plant species endemic to Nebraska. It has received a great deal of attention, for endemism is rare in Great Plains states. This attractive species is confined to a small number of active blowout areas in the Nebraska Sandhills, often in relatively small colonies that are many kilometers apart in a relatively vast grassland. Blowout penstemon, thus, is confined to particular habitats which have distinct boundaries in space. It is also successional in nature, which places individual colonies in distinct and, perhaps, limited boundaries in time. It is …

Establishing Warm-Season Grasses And Forbs Using Herbicides And Mowing, Thomas B. Bragg, David M. Sutherland

Proceedings of the North American Prairie Conferences

The objective of this study was to provide a preliminary assessment of the use of selected herbicides in establishing a diverse stand of prairie grasses and forbs. An upland and a lowland site in eastern Nebraska, consisting of well-drained, fine-silty clay, loess-derived soils, were seeded with 23 native prairie grass and forb species and subsequently mowed or treated at rates of 0.6, 1.1, 1.7, and 2.2 kg/ha with atrazine [6-chloro-Nethyl- N' -(l-methylethyl)-l ,3,S-triazine-2,4-diamine] or 2,4-0 (2,4-dichlorophenoxyacetic acid). Treatments were applied at one and two-year intervals. Canopy cover in unreplicated treatment areas (12 x 30 m) was evaluated in ten randomly …

Effect Of Eastern Red Cedar On Seedling Establishment Of Prairie Plants, Dan J. Stipe, Thomas B. Bragg

Proceedings of the North American Prairie Conferences

To test the hypothesis that eastern red cedar (Juniperus virginiana L.) is allelopathic, seedling establishment of five herbaceous prairie species was evaluated by growing seeds in soil collected beneath and adjacent to a stand of this tree species. While four species showed no significant effect, the germination of one species, finger coreopsis (Coreopsis palmata Nutt.), was significantly reduced. Since eastern red cedar is an early invader of unburned prairie, such an allelopathic effect, even on only a few species, is of particular concern in that it has the potential to hasten degradation of invaded prairie sites.

Distribution Of Flodman's Thistle And Its Response To Different Disturbances, Charles E. Umbanhowar Jr.

Proceedings of the North American Prairie Conferences

The importance of disturbance in prairie has long been recognized. Increasingly interest and research have focused on the action and interaction of multiple disturbances. The distribution of Flodman's thistle [Cirsium flodmanii (Rydb.) Arthur] on ant mounds, badger mounds, buffalo wallows, and potholes and in a lightly and a moderately grazed pasture was compared at the Nature Conservancy's S. H. Ordway Jr. Memorial Prairie in northcentral South Dakota. In the lightly grazed pasture, Flodman's thistle occurred most frequently on hilltops and ridges, but in the moderately grazed pasture it occurred with equal frequency on hilltops and ridges, and low areas …

Determining Federally Listed Endangered And Threatened Species, Emphasizing Blowout Penstemon, Wallace G. Jobman

Proceedings of the North American Prairie Conferences

Blowout penstemon (Penstemon haydenii S. Wats.) was federally listed as an endangered species on 1 September 1987. This pap"!r describes the process by which species, emphasizing blowout penstemon, are listed. The five listing factors described in Section 4 of the Endangered Species Act, candidate species, and the listing process are discussed. The blowout penstemon listing process progressed as follows: 1) petition to list; 2) designation as Category 2 Candidate Species; 3) status survey; 4) designation as Category 1 Candidate Species; 5) proposed rule to list; and 6) the final listing rule. The primary reasons for listing were the stabilization …

Designing With Prairie: A Heideggerian Hermeneutical Analysis, Evelyn A. Howell, Dave Egan

Proceedings of the North American Prairie Conferences

Landscape architects have been advocating the use of native species in designs for over 100 years. This Heideggerian hermeneutical analysis of the work of authors from 1919 to 1929 yields several underlying themes regarding the use of native species: 1) biological conservation (preservation), 2) possession (control of human-ordered world), 3) promotion of national and regional identity, 4) spirituality, and 5) aesthetics. The prairie-inspired designs of Jens Jensen, Darrel Morrison, and John Diekelmann illustrate the ways in which the emphasis placed on these themes and different assumptions about "prairie" influence the resultant plantings. Jensen's works are meant to evoke the relationship …

Correlations Between Insects And Birds In Tallgrass Prairie Riparian Habitats, Lawrence J. Gray

Proceedings of the North American Prairie Conferences

Previous observations in riparian habitats of Kings Creek, Konza Prairie Research Natural Area, Kansas indicated that emerging aquatic insects represent a concentrated source of food for insectivorous birds, particularly the flycatcher and gleaner guilds. This hypothesis was tested by concurrent measurements of net insect emergence (total emergence minus adults returning to the stream) and densities of birds at six sampling sites from June to August 1987 and May to June 1988. Significant positive correlations with emergence were found for flycatchers (r = 0.93) and gleaners (r = 0.91), the two insectivore guilds containing the majority of individuals along Kings Creek. …

Seasonal Activity Of Snakes On A Sand Prairie, Dwight R. Platt

Proceedings of the North American Prairie Conferences

Snakes were caught in drift fence traps throughout the season of activity on a 32 ha sand prairie in Harvey County, Kansas, from 1966 through 1974. In these nine seasons, 128,281 trap station days yielded 6,412 captures of the six most common species of snakes: Pituophis melanoleucus sayi, Coluber constrictor jlaviventris, Thamnophis sirtalis parietalis. Thamnophis radix haydeni, Heterodon nasicus, and Heterodon platirhinos. Seasonal activity patterns, although variable from year to year, had a bimodal pattern with a period of low activity in late July or late August. Increases in snake activity resulted from increases in population size due …

Rodents And Shrews In Un-Grazed Tallgrass Prairie Manipulated By Fire, Donald W. Kaufman, Glennis A. Kaufman, Elmer J. Finck

Proceedings of the North American Prairie Conferences

Natural prairie was a mosaic of patches of depths of plant litter due to topoedaphic conditions and to spatial-temporal variation in fire and grazing. Such variation in litter depth undoubtedly influenced the distribution and abundance of small mammals. To examine this issue, small mammals were censused and plant litter depth was measured during autumn from 1981 to 1984 on the Konza Prairie Research Natural Area near Manhattan, Kansas. Five to 11 sites subjected to fire at different times from 1967 to 1984 were sampled during each of the four years of the study. Relative densities of deer mice (Peromyscus …

Proceedings Of The Eleventh North American Prairie Conference: Index To Authors And Key Words

Proceedings of the North American Prairie Conferences

Index to Authors and Key Words

Do You Know Platanthera Praeclara?, Rochelle Bjugstad, Ardell J. Bjugstad

Proceedings of the North American Prairie Conferences

This is a brief synthesis on the plant, habitat and range of the western prairie fringed orchid (Platanthera praeclara Sheviak and Bowles). This species was once common in the tall grass prairie, but its numbers have been greatly reduced by improper management and loss of habitat. Comparisons are made to the eastern prairie fringed orchid [Platanthera leucophaea (Nutt.) Lindl].

Proceedings Of The Eleventh North American Prairie Conference: Cover

Proceedings of the North American Prairie Conferences

No abstract provided.

Lloyd C. Hulbert 1918-1986 (Proceedings Dedication)

Proceedings of the North American Prairie Conferences

Because we have and will yet all benefit from his vision, leadership, and unselfish efforts, it is fitting that these Proceedings be dedicated to Lloyd C. Hulbert, Professor of Biology, Plant Ecologist for the Kansas Agricultural Experiment Station, and Director of the Konza Prairie Research Natural Area.