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A Review Of The Agronomic Characteristics Of Endophyte-Free And Endophyte-Infected Tall Fescue, Jeffrey F. Pedersen, G. D. Lacefield, D. M. Ball

Department of Agronomy and Horticulture: Faculty Publications

Agronomic differences between endophyte- (Acremonium coenophialum Morgan Jones and Gams) free and endophyte-infected tall fescue (Festuca arundinacea Schreb.) exist, and should be considered when implementing a management strategy. Although dry matter yield of tall fescue does not generally appear to be influenced by endophyte infection status, endophyte infection has been shown to improve seedling performance and survival, is associated with insect and nematode resistance, drought resistance, improved nitrogen assimilation, and higher seed set. Considering all biologically valuable characters of the endophyte-tall fescue relationship, survival of endophyte-infected tall fescue is probably better than that of endophyte-free tall fescue, especially in drought- …

Fescues With Large Roots Are Drought Tolerant, H. A. Torbert, J. H. Edwards, Jeffrey F. Pedersen

Department of Agronomy and Horticulture: Faculty Publications

Consideration of root/soil interactions is essential in, adapting tall fescue (Festuca arundinacea Schreb.) to soil and climatic conditions of the Coastal Plain region of the southeast. Sandy soils of the region are very susceptible to the formation of hardpans. These compacted layers often restrict plant root development to the plow layer (0 to 6 in.) and prevent plant roots from reaching available moisture and nutrients in the subsoil horizons. Plants grown under these conditions are shallow rooted and will be subjected to water stress up to 50% of the time during the growing season. Although implements are available to penetrate …

Adsorption Of Bromide Tracers Onto Sediment, John E. Gilley, S. C. Finkner, John W. Doran, E. R. Kottwitz

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Information concerning hydraulic parameters on upland areas could be greatly expanded through the use of tracing techniques. If bromide is used as a tracer, adsorption of bromide onto sediment may be of concern. Therefore, a laboratory study was conducted to identify the effects of sediment content and initial bromide concentration on adsorption of bromide for selected soils.
When bromide solutions were used within the appropriate instrument measurement range, neither soil texture, liming, nor sediment content were found to significantly affect adsorption of bromide. In contrast to systems using fluorescent dyes, correction factors for estimating adsorption of bromide are unnecessary. Since …

Spatial Memory In Seed-Caching Corvids, Alan Kamil, Russell P. Balda

Papers in Behavior in Biological Sciences

Our purpose in this article is to review the results of our studies of the mechanisms underlying cache recovery by members of the crow, jay, and nutcracker family. In this research program, we have combined psychological and ecological approaches to the study of memory, and the results demonstrate the utility of this interdisciplinary strategy. Unlike most psychological research on learning and memory, this research program originated in the study of how a particular species solves a particular ecological problem. It serves as an example of how natural history and ecology can provide the starting point for a research program that …

The Functional Organization Of The Vestigial Locus In Drosophila Melanogaster, Jim A. Williams, Audrey L. Atkin, John B. Bell

School of Biological Sciences: Faculty Publications

Vestigial mutants are associated with imaginal disc cell death which results in the deletion of adult wing and haltere structures. The vestigial locus has previously been cloned, and mutational lesions associated with a number of vg alleles were mapped within a 19 kb DNA region defined as essential for vg function. Herein we report the identification and characterization of a developmentally regu-lated 3.8 kb vg transcript which is spliced from exons distributed throughout the essential interval defined above. All the characterized classical alleles have predictable effects on this transcription unit, and the severity of this effect is directly proportional to …

Construction Of An Opal Suppressor By Oligonucleotide-Directed Mutagenesis Of A Saccharomyces Cerevisiae Trna Gene, Audrey L. Atkin, K. L. Roy, J. B. Bell

School of Biological Sciences: Faculty Publications

In vitro mutagenesis was used to create putative opal suppressor alleles of a tRNA^Trp gene of Saccharomyces cerevisiae. The construct with the requisite anticodon change did not result in an active suppressor, whereas when a second change was introduced into the portion of the gene encoding the intron, an active and specific opal suppressor was produced. We propose that the secondary structure of transcripts from the first mutant may prevent efficient pre-tRNA processing, whereas normal processing occurs with the double mutant.

Relationships Between Blood Parasites, Mating Success And Phenotypic Cues In Male Sage Grouse Centrocercus Urophasianus, Robert M. Gibson

School of Biological Sciences: Faculty Publications

In lek breeding Sage Grouse Centrocercus urophasianus in eastern California, male mating success is strongly correlated with individual differences in lek attendance, and in the rate and acoustic quality of courtship display, suggesting that these provide cues by which females choose mates. Increased lek attendance and high display rates also associated with elevated metabolic expenditure. This paper examines the hypothesis that the ability to commit energy to display is related to the incidence of blood parasites. A single hematozoan genus, Haemoproteus, was found in 37.5% of 184 Sage Grouse sampled over a five year period. Parasitism varied across years and …

Geographic Distribution: Tropidoclonion Lineatum (Lined Snake). Usa: Nebraska: Douglas Co., Louis A. Somma, James D. Fawcett

Papers in Herpetology

TROPIDOCLONION LINEATUM (Lined Snake). USA: NEBRASKA: Douglas Co. Omaha. jct. of 156th & F Streets (NE corner Sec. 3, T14N, R11E). 3 June 1980. J.J. Krupa. UNO 102-03680. Adult killed by lawnmower (J. Krupa. pers. comm.) at relict tallgrass prairie site (Beottcher 1981, Master's Thesis, University of Nebraska at Omaha). ca. 82.5 km SE of record in Cuming County and 75 km NE of record in Lancaster County (Lynch 1985, Trans. Nebraska Acad. Sci. 13: 33-57). Fills gap between easternmost records in central Nebraska and Westernmost records in Iowa (Christiansen 1981, Proc. Iowa Acad. Sci. 88: 24-26; Christiansen & Bailey, …

Predispersal Seed Predation, Postdispersal Seed Predation And Competition In The Recruitment Of Seedlings Of A Native Thistle In Sandhills Prairie, Svata M. Louda, Martha A. Potvin, Sharon K. Collinge

Svata M. Louda Publications

Platte thistle (Cirsium canescens Nutt.) is a native monocarpic plant species of Sandhills prairie. We concurrently tested three biological interactions that could influence its recruitment and population density: (1) predispersal flower and seed consumption by insects; (2) postdispersal loss of seeds to vertebrates, and (3) seedling competition with established plants. Few previous experimental studies have analyzed more than one of these processes at a time. Each interaction had a significant negative impact on seedling establishment. Insect seed predation caused major losses that were magnified in each succeeding life history stage. A 3-fold reduction in viable seeds by insects led …

Toxicity Of Protease-Resistant Domains From The Delta-Endotoxin Of Bacillus Thuringiensis Subsp. Israelensis In Culex Quinquefasciatus And Aedes Aegypti Bioassays, Mary Ann Pfannenstiel, William C. Cray Jr., Graham Couche, Kenneth W. Nickerson

Papers in Microbiology

The mosquitocidal glycoprotein endotoxin of Bacillus thuringiensis subsp. israelensis was digested with chymotrypsin to yield protease-resistant domains which were then separated from smaller protease digestion products by high-performance liquid chromatography. Once purified, the domains no longer bound wheat germ agglutinin, a lectin which binds N-acetylglucosamine (GlcNAc) and GlcNAc oligomers. Purified protease-resistant domains were as toxic for Culex quinquefasciatus larvae as intact solubilized toxin. In separate experiments, the toxicity of chymotrypsin-digested endotoxin for Aedes aegypti larvae was reduced fivefold or more. A model is presented in which GlcNAc-containing oligosaccharides are required for toxicity for A. aegypti larvae but not C. …

Cuticular Ridge Pattern In Ostertagia Gruehneri And Ostertagia Arctica (Nematoda: Trichostrongyloidea) From Caribou, Rangifer Tarandus, J. Ralph Lichtenfels, P. A. Pilitt, M. Fruetel

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Two species of medium stomach worms are common parasites of the caribou, Rangifer tarandus. The two species, Ostertagia gruehneri Skrjabin, 1929, and O. arctica Mitzkewitzsch, 1929, differ so markedly in morphology of the spicules and genital cone that many nematode systematists place them in different genera. Recent studies of similar pairs of species parasitic in other ruminants have provided evidence that such pairs of species may be morphotypes of one species. The two species from caribou are redescribed with emphasis on the pattern of surface cuticular ridges and the structure of the esophagus, characters considered useful for distinguishing species …

Some Helminth Parasites Of Dunlin (Calidris Alpina) And Western Willet (Catoptrophorus Semipalmatus Inornatus) From California, Hilda Lei Ching

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Dunlins and western willets were collected on their winter feeding grounds at Bodega Bay and Bolinas Lagoon, California, during 1986. Six digeneans, eight cestodes, two acanthocephalans, and a new nematode were found in dunlins. Seven digeneans, two cestodes, one acanthocephalan, and the new nematode were found in western willets; four helminths including the new roundworm were common to dunlins. Thominx cecumitis sp. n. differs from other capillarid nematodes with a spinous spicule-sheath in having a short, globular vulvar appendage, peanut-shapcd eggs, a cuticular ball at the posterior tip of the body, narrow lateral alae, and a cuticular genital bursa.

Helminth Parasitism In Martens (Martes Americana) And Ermines (Mustela Erminea) From Washington, With Comments On The Distribution Of Trichinella Spiralis, Eric P. Hoberg, Keith B. Aubry, J. David Brittell

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Helminths are reported for the first time from ermines (Mustela erminea) and martens (Martes americana) in Washington, USA. Among 22 adult ermines, 41% were infected by one or more of five species (Taenia mustelae, Alaria mustelae, Molineus patens, M. mustelae, and Trichinella spiralis). Among 78 adult martens from three geographic localities, the prevalence was 83%. Nine species were identified (Mesocestoides sp., T. mustelae and T. martis americana, Euryhelmis squamula, M. patens, Baylisascaris devosi, Physaloptera sp., Soboliphyme baturini, and T. spiralis). Trichinella spiralis …

Hawks, Eagles, And Falcons Of North America: Biology And Natural History, Paul A. Johnsgard

Paul Johnsgard Collection

I have tried to present an adequate if far from exhaustive survey of the general biology, ecology, and behavior of all the included species, written so as to be understandable to the interested layman as well as useful to the biologist who might be looking for relevant literature citations or trying to deal with a specific question without resorting to extensive library searches. The larger number of species of North American hawklike birds (31, compared to 19 owl species) has required that I keep the individual species accounts substantially shorter. I have excluded the New World vultures from consideration, primarily …

Binder 178, Plagiorchiidae P [Trematoda Taxon Notebooks], Harold W. Manter Laboratory Of Parasitology

Trematoda Taxon Notebooks

Binder 178, Plagiorchiidae P [Trematoda Taxon Notebooks].

Harold W. Manter Laboratory of Parasitology, University of Nebraska State Museum, University of Nebraska-Lincoln.

Created between 1960 and 1990.

Cross Section, Robert Katz

Robert Katz Publications

In radiobiology the term cross section is used in ways that depart from its original physical meaning. Some of these conceptual extensions represent significant distortions of the original concept. These distortions lead to the misinterpretation of experimental findings.

Dr. Benjamin (Ben) Goodwin Chitwood, William F. Mai, Armand Maggenti

Harold W. Manter Laboratory of Parasitology: Faculty Publications

An overview of the life and work of Dr. Benjamin (Ben) Goodwin Chitwood (1907-1972), nematologist with the United States Department of Agriculture.

Phytoplankton Dynamics In Three Rocky Mountain Lakes, Colorado, U.S.A., Diane M. Mcknight, Richard L. Smith, J. Platt Bradbury, Jill S. Baron, Sarah Spaulding

United States Geological Survey: Staff Publications

In 1984 and 1985 seasonal changes in phytoplankton were studied in a system of three lakes in Loch Vale, Rocky Mountain National Park, Colorado. Three periods were evident: (1) A spring bloom, during snowmelt, of the planktonic diatom Asterionella Formosa, (2) a mid- summer period of minimal algal abundance, and (3) a fall bloom of the blue-green alga Oscillatoria limnetica. Seasonal phytoplankton dynamics in these lakes are controlled partially by the rapid flushing rate during snowmelt and the transport of phytoplankton from the highest lake to the lower lakes by the stream, Icy Brook. During snowmelt, the A. …

Description Of A New Species Of Plectus Bastian, 1865 (Nemata : Plectidae) From Mendocino County, California, Usa With Sem Observations, Peter A. Maggenti, Armand R. Maggenti, Fawzia Abdel-Rahman

Harold W. Manter Laboratory of Parasitology: Faculty Publications

A new species of Plectus Bastian, 1865 is described and illustrated, P. minutus n. sp. is characterized by its small size, indistinct body annulation, generally one longitudinal ala visible with light microscope on each lateral surface of the body (two seen with SEM), cervical papilla dorsatlo lateral ala, high cephalic region not set off from the body, cephalic setae not reaching the apex of the cephalic region, and tail conoid elongated generally with three pairs of setae.

French language title: Description d’une nouvelle espèce de Plectus Bastian, 1865 (Nemata : Plectidae) provenant du Comté de Mendocino (Californie, USA), accompagnée d’observations …

Leafy Spurge: Threat To Central Plains Grasslands, Robert A. Masters

United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications

Leafy spurge (Euphorbia esula L.) is a noxious weed that threatens grasslands in the central and northern Great Plains and the prairie provinces of Canada. Leafy spurge threatens prairie communities by displacing native species and reducing species diversity. Effective management of this undesirable plant requires that one be able to identify leafy spurge, understand the characteristics that contribute to its aggressive habit, and be aware of practices that are available to control this noxious weed. The aggressive habit of leafy spurge is related to its ability to reproduce both by seed and by numerous adventitious shoot buds located along …

Stability Of Iaa And Iba In Nutrient Medium To Several Tissue Culture Procedures, Scott Nissen, Ellen Sutter

Department of Agronomy and Horticulture: Faculty Publications

The relative stabilities of IAA and IBA under various tissue culture procedures were determined. IBA was significantly more stable than IAA to autoclaving. IBA was also found to be more stable than IAA in liquid Murashige and Skoog medium (MS) under growth chamber conditions. The stabilities of IBA and IAA were similar in agar-solidified MS. Light provided by cool-white fluorescent bulbs promoted degradation of IAA and IBA in both liquid and agar media. Activated charcoal in concentrations as high as 5% was found to adsorb more than 97% of IAA and IBA in liquid MS. These results have important implications …

Proceedings Of The Perdix V Symposium: Gray Partridge And Ring-Necked Pheasant Workshop, Kevin E. Church, Richard E. Warner, Stephen J. Brady

Galliformes Specialist Group and Affiliated Societies: Conference Proceedings

Distribution and Abundance

Northern bobwhite, gray partridge, and ringed- neck pheasant population trends (1966-1988) from the North American Breeding Bird Survey, S. Droege and J. R. Sauer

Recent status of gray partridge in North America, W. J. Vander Zouwen

Historical review and status of gray partridge in Italy, C. Matteucci and S. Toso

Gamebird introductions in New Zealand: Successes and failures, K. Westerskov

Habitat Management Programs State and provincial programs for habitat enhancement on private agricultural lands, W. J. Vander Zouwen

Indirect impacts of pesticides on the production of wild gamebirds in Britain, N. W. Sotherton and P. A. Robertson …

Pathological Intoxication And The Model Penal Code, Lawrence P. Tiffany

Nebraska Law Review

I. Introduction

II. The Model Penal Code

III. Pathological Intoxication Under the Model Penal Code

IV. Conclusion

The Role Of Sediment Type In Growth And Fecundity Of Mud Snails (Hydrobiidae), Valery E. Forbes, Glenn R. Lopez

Valery Forbes Publications

We test the hypothesis that body size and population density of the deposit-feeding gastropod, Hydrobia truncata, are greater in muddy than in sandy habitats as a result of faster growth on fine- compared to coarse-grained sediments. We refute this hypothesis using a combination of field measurements and laboratory experiments. Three out of three populations tested had higher maximal growth rates and two of three populations approached their asymptotic size more quickly on sand than on silt-clay fractions of natural sediment. Growth decreased with increasing snail density and was as high or higher on sand as on silt-clay at all …

The Prairie Naturalist Volume 21, No.4 December 1989

The Prairie Naturalist

SMALL MAMMALS IN TALL-GRASS PRAIRIE: PATTERNS ASSOCIATED WITH GRAZING AND BURNING ▪ E. K. Clark, D. W. Kaufman, E. J. Finck, and G. A. Kaufman

BURROW DISTRIBUTION OF THIRTEEN-LINED GROUND SQUIRRELS IN RELATION TO TREE CANOPIES ▪ J. L. Koprowski 185

SPRING AND SUMMER PREY REMAINS COLLECTED FROM MALE MINK DENS IN SOUTHWESTERN MANITOBA ▪ . T. W. Arnold and E. K. Fritzell

BREEDING CANVASBACKS: A TEST OF A HABITAT MODEL ▪ D. H. Johnson, M. C. Hammond, T. L. McDonald, C. L. Nustad, and M. D. Schwartz

A CHECKLIST OF THE ANTS OF OKLAHOMA ▪ G. C. Wheeler and …

Book Review: Soil Biology Guide, Ross H. Arnett Jr.

Insecta Mundi

Under the skillful direction of Professor Dindal of Syracuse University, the work of 54 authors, 11 years in the making, is blended into one large, useful volume treating the systematics and biology of all organisms involved in the soil ecology of North America, north of Mexico. The separate authors treat their special groups following a similar format throughout, covering the biology, taxonomy, and ecology of each soil biotic group. The amount of data presented varies with the extent of knowledge of the group treated. The 43 chapters cover all taxa from soil bacteria through the insects. The insects are covered …

Apionidae From North And Central America. Part 1. Notes On The Classification Of The Apion Subgenus Trichapion Wagner With Description Of New Species From The United States Of America. (Coleoptera), David G. Kissinger

Insecta Mundi

Selected taxonomic characters of Apion species are redefined and explained including subcephalic ridge, sensory seta and macrochaeta. New species described are Apion (Trichapion) memnonmonum Kissinger, Black Mountains, North Carolina and Apion (Trichapion) nelsoni Kissinger from Davis Mts, Texas and Santa Rita Mts, Arizona. Supplemental descriptions or new records are given for the following species: Apion aequabile Fall, A. brunnicornis Fall, A. eccentricum Fall, A. minor Smith, A. punctulirostre Sharp and A. submetallicum Boheman.

A statistical test is used to evaluate the importance of a character in defining species groups in the Apion subgenus Trichapion Wagner. Eighteen characters met this criterion …

Sandhill Crane Press Catalogs

Insecta Mundi

This is a catalog of the books now published by or available directly from The Sandhill Crane Press, Inc. All of the Flora & Fauna Publications books are now stored in our warehouse. They may be ordered from us, some at a significant discount, by using the order form sent with this catalog. Note that some books are in press, but they may be ordered at a prepublication price.

My Association With William Steel Creighton, George C. Wheeler

Insecta Mundi

The recent (1986) publication of “My Association with William Morton Wheeler” evidently stirred my latent autobiographical urge. It is quite reasonable that I should next apply it to William Steel Creighton, for he certainly ranks next to W. M. Wheeler among American myrmecologists. It will be quite different, however, because my actual association with Creighton was very brief twice a dinner guest in New York City and two visits in La Feria, Texas. Correspondence, however, is quite different. I received 45 letters from W. M. Wheeler between 1919 and 1936; the last was dated four months before his death. They …

Book Review: Crop And Plant Protection, The Practical Foundations By Rudolph Heitefuss, V. K. Gupta

Insecta Mundi

This book integrates present knowledge in crop protection from the theoretical and practical points of view. Pest control Information derived from field like plant pathology, entomology, nematology and weed science is analyzed with reference to plant breeding and nutrition, agronomy and agricultural economics, and some general conclusions are drawn about prognoses, forecasting, and integrated pest control.