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Trace Element Concentrations In Water, Sediment And Biota From Pathfinder National Wildlife Refuge, Natrona And Carbon Counties, Wyoming, Pedro Ramirez Jr., Kimberly Dickerson, Mary Jennings

United States Fish and Wildlife Service: Publications

Pathfinder National Wildlife Refuge (Pathfinder NWR), located in Natrona and Carbon Counties, is 50 miles southwest of Casper, Wyoming. Pathfinder NWR, established in 1936, is a refuge and breeding area for migratory waterfowl. The refuge initially encompassed the entire Pathfinder Reservoir, an impoundment of the North Platte River. In 1965, the U.S. Fish and Wildlife Service reduced it to four smaller units to allow more intensive management: the Sweetwater Arm, Goose Bay Unit, DeWeese Creek Unit, and the Sage Creek-Platte Unit. We collected water, sediment and biota samples for trace element analyses in May, June and July 1993 from wetlands …

Contributions Of The Conservation Reserve Program To Populations Of Breeding Birds In North Dakota, Douglas H. Johnson, Lawrence Igl

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

Previous studies have shown that habitat provided by the Conservation Reserve Program (CRP), a feature of the 1985 farm bill, is used by many birds. The present study quantitatively assesses the importance of the CRP by estimating changes in breeding bird populations of North Dakota projected if CRP land would revert to cultivation. Of 18 species that were common in CRP or crop fields or both, 12 were more abundant in CRP habitats. Six of these species had suffered significant population declines during 1967-1990, according to the North American Breeding Bird Survey. In contrast, none of the six species that …

1995 Platte River Basin Ecosystem Symposium Proceedings

Water Current Newsletter

No abstract provided.

Audubon's Perspective On Coyotes, Dede Armentrout

Coyotes in the Southwest: A Compendium of Our Knowledge (Symposium Proceedings, 1995)

Audubon has a membership which probably spans all views of coyotes (Canis latrans) Audubon's staff views coyotes as biologically appropriate predators in most of the Southwest. We believe that they can be an asset to a well-managed ranch, but that they can also cause localized depredation which must be answered.

Our members value predators, including coyotes, for their natural role in ecological systems, including their influence on prey species. Many of our members travel broadly and spend money to view wildlife, and consider it a treat to see and hear coyotes.

Ecological Genetics For The 21st Century, Bonnie S. Bowen

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

In the spring of 1991, the University of North Carolina hosted a series of seminars on the topic of ecological genetics. Five distinguished researchers, Montgomery Slatkin, Sara Via, Michael Lynch, Janis Antonovics, and Joseph Travis, were each invited to present two talks: one a general overview of a research area in contemporary ecological genetics, and a second on a specific research topic. The ten chapters of Ecological Genetics are based on those presentations.

A Noteworthy Record And The Breeding Distribution Of The Blue Grosbeak In North Dakota, Lawrence D. Igl

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

The northern limit of the blue grosbeak's (Guiraca caerulea) breeding distribution occurs in southern North Dakota. Records of the blue grosbeak in North Dakota are uncommon. Here, I report my observation of a blue grosbeak at a site where the species was recorded 25 years earlier. A summary of the species' distribution and records in North Dakota are provided.

Dramatic Increase Of Le Conte's Sparrow In Conservation Reserve Program Fields In The Northern Great Plains, Lawrence D. Igl, Douglas H. Johnson

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

During a continuing investigation in the northern Great Plains, we documented substantial increases of the Le Conte's Sparrow (Ammodramus Leconteii) in Conservation Reserve Program (CRP) fields in 1994 compared with 1990-93. The most dramatic increases occurred in Eddy County, North Dakota, and Sheridan County, Montana. The changes in habitat associated with the drought from 1989 to early 1993 and above-normal precipitation from mid-1993 through mid-1994 likely produced favorable breeding conditions for this species in CRP fields in 1994.

Nebraska Summary: S197 Massey Ferguson 8120, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Avian Use Of Riparian Corridors And Adjacent Cropland In East-Central Nebraska, Rebecca L. Fitzmaurice

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Influences Of Trees On Abundance Of Natural Enemies Of Insect Pests: A Review, Mary Ellen Dix, R. J. Johnson, Mark O. Harrell, Ronald M. Case, Robert J. Wright, Laurie Hodges, James R. Brandle, Michelle M. Schoeneberger, N. J. Sunderman, R. L. Fitzmaurice, Linda J. Young, Kenneth G. Hubbard

Department of Agronomy and Horticulture: Faculty Publications

In this article we review the use of natural enemies in crop pest management and describe research needed to better meet information needs for practical applications. Endemic natural enemies (predators and parasites) offer a potential but understudied approach to controlling insect pests in agricultural systems. With the current high interest in environmental stewardship, such an approach has special appeal as a method to reduce the need for pesticides while maintaining agricultural profitability. Habitat for sustaining populations of natural enemies occurs primarily at field edges where crops and edge vegetation meet. Conservation and enhancement of natural enemies might include manipulation of …

Velvetleaf (Abutilon Theophrasti) Recruitment, Survival,Seed Production, And Interference In Soybean (Glycine Max), John L. Lindquist, Bruce Maxwell, Douglas Buhler, Jeffrey Gunsolus

Department of Agronomy and Horticulture: Faculty Publications

Field studies were conducted at Rosemount, MN, in 1992 and 1993 to quantify the demographic processes regulating the population dynamics of velvetleaf in soybean as part of a corn-soybean rotation. A consistent 6.8 ± .08% of the total velvetleaf seedbank emerged each year. Less than 21% of all velvetleaf seedlings survived each year in mixture with soybean, due in part to Verticilium spp wilt infection. The probability of seedling survival varied across time of emergence Velvetleaf seed production in the absence of crop competition was 125 and 227 seeds plant^-1 in 1992 and 1993, respectively. Velvetleaf plants that emerged …

Brown· Midrib Sorghum Silage For Midlactation Dairy Cows, R. J. Grant, S. G. Haddad, K. J. Moore, Jeffrey F. Pedersen

Department of Agronomy and Horticulture: Faculty Publications

Brown midrib sorghum silage was compared with alfalfa, corn, and normal sorghum silages for its effect on performance, ruminal metabolism, and digestive kinetics of Holstein dairy cows in midlactation. Twelve cows averaging 90 ± 5 DIM were assigned to one of four diets in replicated 4 X 4 Latin squares with 4-wk periods. Additionally, 3 ruminally fistulated cows (95 ± 20 DIM) were assigned to the same diets in a 3x 4 Youden square for measurement of ruminal characteristics. Diets were fed as isonitrogenous TMR that contained 65% silage (OM basis). The DMl was greater for the corn and brown …

Review Of Skeletal Biology In The Great Plains: Migration, Warfare, Health, And Subsistence, Edited By Douglas W. Owsley And Richard L. Jantz. Washington, D.C.: Smithsonian Institution Press, 1994. 415 Pages., Alan J. Osborn

Department of Anthropology: Faculty Publications

First paragraph:

The editors and contributors to this large, impressive volume present thirty-two chapters that deal with Great Plains skeletal biology. The goal of these diverse investigations was to derive critical information from human skeletal remains about past inhabitants of the Plains, including prehistoric and historic Indians, as well as Euro-Americans. These contributions are organized topically into five parts: (1) archaeology; (2) demography and paleopathology; (3) biological distance measures and skeletal morphology; (4) diet and subsistence strategies; and (5) warfare. The studies represent the collaborative efforts of archaeologists, physical anthropologists, ethnologists, ethnohistorians, and physical scientists. A major impetus for these …

Geophagy: Adaptive Or Aberrant Behavior, David E. Engberg

Nebraska Anthropologist

Geophagy, clay or dirt eating, is a worldwide phenomenon of long historical precedence. Historically perceived as an irrational behavior, today, growing evidence supports the contention that earth eating has adaptive value. Case studies from Africa and the United States illustrate the practice. A literature review shows that three primary explanations have been offered to account for the presence of geophagy in human populations. The first argues that geophagy has medicinal value as an anti-diarrheal and as a dietary supplement in vitamin and mineral poor environments. The Second contends that geophagy is a culturally transferred practice. The third states that earth …

Reducing Societal Vulnerability To Drought: A Methodology, Donald A. Wilhite

National Drought Mitigation Center: Faculty Publications

Given worldwide experience with drought during the past several decades and the magnitude of associated impacts, it is apparent that vulnerability to extended periods of water shortage is escalating. Developing a national or provincial drought policy and preparedness plan is a complicated but essential first step toward reducing societal vulnerability. Until recently, nations had devoted little effort to drought preparedness, preferring instead the reactive or crisis management approach. Presently, an increasing number of nations are pursuing a more proactive approach that emphasizes the principles of risk management and sustainable development. Because of the multitude of impacts associated with drought and …

Initial Transgressive Phase Of Leg 144 Guyots: Evidence Of Extreme Sulfate Reduction, Bjørn Buchardt, Mary Anne Holmes

Department of Earth and Atmospheric Sciences: Faculty Publications

The initial transgressive phase at the Leg 144 Guyots is characterized by a typical association of sedimentary facies (from bottom to top): in situ weathered volcanic rocks; variegated clays, partly pyritic; gray clay, pyritic, homogeneous, or mottled; black clay, peaty, laminated, or bioturbated; and marine argillaceous limestone. Site 877 at Wodejebato Guyot represents the typical development of the initial transgressive phase. The black clay is rich in organic carbon (up to 40%) and sulfur (up to 25%). The organic matter is dominantly of terrestrial origin, but it has a significant marine, algal input. The variegated clays consist of a red, …

Population Genetics And Gene Variation In Secondary Screwworm (Diptera: Calliphoridae), David B. Taylor, Richard D. Peterson Ii

Department of Entomology: Faculty Publications

Allozyme variation in 4 populations of secondary screwworm, Cochliomyia macellaria (F.), representing North, Central, and South America was examined . Variability was observed in 12 of 13 enzyme loci, and the frequency of the most common allele was IS statistics indicated random mating within populations . Wright's F_ST statistics and chi-square contingency analyses indicated homogeneous gene frequencies among the populations. These data suggest that C. macellaria is a panmictic species with high levels of gene flow between populations.

Sampling And Preservation Of Rice Insects, Elvis A. Heinrichs, Anthony Youdeowei, Joseph Kwarteng

Department of Entomology: Faculty Publications

Rice is one of the most important food crops in West Africa. In many areas, insect pests cause severe damage to the growing rice plant. If the developing rice grains are attacked, pest damage also reduces the grain quality. For these reasons it is necessary to control pests. To be able to do this effectively, the types of insects causing the damage and their natural enemies must be identified. This information can be obtained by sampling in the rice fields. This training guide has been designed to provide essential information for a practical approach to sampling and preserving insects found …

Voluntary Versus Mandatory Agricultural Policies To Protect Water Quality: Adoption Of Nitrogen Testing In Nebraska, Darrell J. Bosch, Zena L. Cook, Keith O. Fuglie

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

Agriculture is among the principal contributors of nonpoint source pollution, a major cause of impaired water quality (Puckett). The amount of agricultural pollution depends in part on agricultural practices or technologies that farmers employ. In the United States, policies for changing farmers' practices related to soil conservation and water quality protection have usually relied on voluntary adoption of new practices. Policy tools to promote voluntary adoption include extension education, technical assistance, and cost sharing. In recent years, both state and federal water quality projects have been initiated targeting these different approaches to different areas. Increasingly, however, regulation is being used …

Development Of Maize Weevils (Coleoptera: Curculionidae) On Corn Lines Resistant To An Aflatoxin-Producing Fungus, James E. Throne, James E. Baker, Gene E. Scott

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

Susceptibility to the maize weevil, Sitophilus zeamais Motschulsky, of corn lines bred for their resistance to the aflatoxin-producing fungus Aspergillus flavus Link ex Fries was determined in the laboratory. Duration of maize weevil development, number of progeny produced, and an index of susceptibility varied with corn line; number of eggs laid and survivorship from egg to adult emergence did not vary with corn line. Soluble carbohydrate, kernel hardness, lipid, soluble nitrogen, free and bound phenolic acids, Kjeldahl protein, and protein/carbohydrate ratio varied with corn line; equilibrium moisture content did not vary with corn line. The only relationship between biological parameters …

Volatilization Of Alachlor And Atrazine As Influenced By Surface Litter, Timothy Gish, Ali Sadeghi, Brian J. Wienhold

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

A basic knowledge of how herbicide volatilization is influenced by agronomic practices is necessary if long-term detrimental impacts from herbicides are to be minimized. We measured cumulative herbicide volatilization losses in glass agroecosystem chambers to assess how surface residue conditions, simulated rainfall, temperature, and herbicide formulation affect volatilization of atrazine and alaehlor. Research results demonstrated that herbicide volatilization before water application was greater under mulched conditions, but decreased dramatically after the first irrigation. As a result, after 35 d cumulative volatilization of atrazine from a mulched soil surface was less than half that from bare soil for both formulations. Plant …

Nebraska Summary: S195 Caterpillar Challenger 45, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Nebraska Summary: S194 Caterpillar Challenger 35, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Nebraska Summary: S198 Massey Ferguson 8140, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Ecology Of Growth Of The High Altitude Lizard Sceloporus Grammicus On The Eastern Slope Of Iztaccihuatl Volcano, Puebla, México, Julio A. Lemos-Espinal, Royce E. Ballinger

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Growth in the lizard Sceloporus grammicus living at two altitudes on the Iztaccihuatl Volcano, Puebla, Mexico, was studied from November 1984 to January 1992. Despite differences in the environmental conditions at these two elevations, individual lizards grew at similar rates at both study sites. Females in both populations grew slower and attained asymptotic size earlier in life than males (0.0025 mm per day and 49.7 mm snout-vent length for females vs. 0.0027 mm per day and 53.2 mm snout-vent length for males). Maximum growth rates were observed early in life in both sexes and sites. Growth in Sceloporus grammicus fits …

Growth Rate As A Function Of Food Consumption In Hatchling Sceloporus Virgatus (Sauria: Iguanidae), Geoffrey R. Smith

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

The potential for food availability and consumption to produce variation in growth rates among hatchling striped plateau lizards (Sceloporus virgatus) was studied under laboratory conditions. Growth rate and survivorship were positively linearly related to the amount of food consumed. Differences in food consumption and availability created large differences in body size by the end of the experiment.

Transactions Of The Nebraska Academy Of Sciences Table Of Contents: Volume 22 (1995)

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Editorial Contents

Nebraska Academy of Sciences Officers, Policy Committee .............. iv

Editorial Board .............. vi

Membership Objectives and Friends of the Academy .............. vii

Nebraska Association of Teachers of Science .............. viii

Preparation of manuscripts .............. inside back cover

Papers

Velocity microhabitats in the edges of the channelized Missouri River (Larry W. Hesse) .............. 1

A preliminary catalog of the lichen-forming fungi of Nebraska (Robert S. Egan, Richard C. Witt, Yolanda E. Peck, John P. Goeden, and Teresa L. Cherney) .............. 13

Keys and distributional maps for Nebraska Cyperaceae, Part 1: Bulbostylis, Cyperus, Dulichium, Eleocharis, Eriphorum, Fimbristylis, Fuirena, Lipocarpha, and …

A Preliminary Catalog Of The Lichen-Forming Fungi Of Nebraska, Robert S. Egan, Richard C. Witt, Yolanda E. Peck, John P. Goeden, Teresa L. Cherney

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

A total of 438 lichen-forming taxa have been reported in the literature from Nebraska. Based on current taxonomic concepts and synonymy we recognized 312 lichen species in this catalog for the state. Published reports of lichen species citing specific collection localities are listed from only 31 counties. These records are concentrated in eastern Nebraska with the largest numbers of species listed from localities in Cass, Lancaster, Saunders, Richardson, and Sarpy counties

Velocity Microhabitats In The Edges Of The Channelized Missouri River, Larry W. Hesse

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Mean column velocity in the filling bank of the channelized Missouri River reached a maximum of 0.875 m/s. In these locations nose velocity was 30% less. Increased volume discharge did not result in increased velocity in the filling bank locations studied. Surface velocity did not exceed 0.5 m/s within the first 3 m from the cutting bank at two locations along the channelized Missouri River near Nebraska City and Tekamah, Nebraska. Within column velocity at the Nebraska City site was typically higher than velocity near the surface and nearer the bottom. However, at the Tekamah site surface velocity was frequently …

A Survey And Analysis Of The Unionid Mollusks Of The Platte Rivers Of Nebraska And Their Minor Tributaries, Ellet Hoke

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

A survey conducted in the Platte basins in Nebraska between 1972 and 1995 documented a bivalve fauna consisting of sixteen native unionids and one introduced exotic species. Five new taxa were confirmed for the Platte basins in Nebraska, increasing the total reported for the region to eighteen unionids and one exotic taxon. The greatest species diversity was found to have existed in tributaries of the Platte rivers, while bivalves were uncommon in the main channel of the Platte River. Man-made environments provide significant habitat for some bivalves in the region.