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Articles 7051 - 7080 of 10405
Full-Text Articles in Entire DC Network
Effect Of Day Length On Sleep Habits And Subjective On-Duty Alertness In Irregular Work Schedules, June J. Pilcher, Heather M. Teichman, Stephen Popkin, Krista Hildebrand, Michael Coplen
Effect Of Day Length On Sleep Habits And Subjective On-Duty Alertness In Irregular Work Schedules, June J. Pilcher, Heather M. Teichman, Stephen Popkin, Krista Hildebrand, Michael Coplen
Publications
The human circadian system is sensitive to environmental conditions, such as those created by shift work, that affect the timing and duration of sleep. Previous research on the effects of shift work, however, has focused primarily on regularly scheduled shifts. Few studies have focused on irregular and unpredictable on-call shift systems, such as those found in much of railroad operations. The purpose of the current study was to examine the effect of irregular shift systems experienced by locomotive engineers on the length of sleep-wake periods and the effect of different length sleep-wake periods on self-reported sleep quantity, sleep quality, and …
To Cover Ancient Prejudice With The Palladium Of Scientific Argument: Women, Reproduction, Pseudo-Science, And The Alarm Of Race Suicide, 1870-1915, Sarah Hamilton '04
To Cover Ancient Prejudice With The Palladium Of Scientific Argument: Women, Reproduction, Pseudo-Science, And The Alarm Of Race Suicide, 1870-1915, Sarah Hamilton '04
Honors Projects, History
In 1905 President Theodore Roosevelt presented the decreasing size of native born American families to Congress as "one of the greatest sociological phenomena of our time" and of"far greater importance than any mere political or economic question," although by that time the size of the American family had been shrinking steadily for about a century. He condemned the tendency towards smaller families as decadent, a sign of moral disease and, like others who worried about "race suicide," he specifically condemned women by categorizing those who avoided large families as criminals against the race and the objects of detestation by healthy, …
Prince Edward County: The Story Without An End; A Report Prepared For The U.S. Commission On Civil Rights, July 1963, Edward H. Peeples
Prince Edward County: The Story Without An End; A Report Prepared For The U.S. Commission On Civil Rights, July 1963, Edward H. Peeples
Edward H. Peeples Prince Edward County (Va.) Public Schools Documents
A report prepared for the United States Commission on Civil Rights by Dr. Edward H. Peeples, Jr., in July 1963. The report is based on interviews and other research done for Dr. Peeples' masters thesis, as well as further interviews and research conducted immediately after the thesis was written. Includes special note to the contemporary reader by Dr. Peeples.
The Seed Bank Of A Reconstructed Prairie, Thomas R. Rosburg, Meredith Owens
The Seed Bank Of A Reconstructed Prairie, Thomas R. Rosburg, Meredith Owens
Proceedings of the North American Prairie Conferences
Seed banks, the reserve of viable seeds dormant in the soil, function in several important roles in the population and community dynamics of plant communities. Identification of the seed bank can furnish information on the vegetation history of a habitat, predict the future composition of the plant community, and provide insight on the seed viability and biology of plant species. Although seed banks of prairie ecosystems have been well studied, very little information exists on seed banks of reconstructed prairie. Identification of seed bank populations of reconstructed prairie provides a means to evaluate the success of restorations and establishes baseline …
White-Tailed Deer (Odocoileus Virginianus Zimmermann) Browsing Effects On Quality Of Tallgrass Prairie Community Forbs, Roger C. Anderson, Debra Nelson, M. Rebecca Anderson, Marcia A. Rickey
White-Tailed Deer (Odocoileus Virginianus Zimmermann) Browsing Effects On Quality Of Tallgrass Prairie Community Forbs, Roger C. Anderson, Debra Nelson, M. Rebecca Anderson, Marcia A. Rickey
Proceedings of the North American Prairie Conferences
We examined the effect of white~tailed deer (Odocoiieus virginianus Zimmermann) browsing on community quality of tallgrass prairie forbs at a site in northeastern Illinois over a period of ten years (1992- 2001). Deer densities in the study area varied from 32- 50 km-2 (83- 130 deer mi-2) between 1992 and 1997 and declined to 7- 9 km-2 (18- 23 mi-2) following initiation of hunting. In a plot protected from deer browsing, abundances of browse-sensitive species increased and unpreferred and browse~tolerant species decreased. Community quality of forbs measured with a new index, Weighted Mean …
Grassland Bird Use Of Crp Fields That Differ By Age-Class And Cover Type, Kristel K. Bakker, Sarah L. Eggebo, Kenneth F. Higgins, David E. Naugle
Grassland Bird Use Of Crp Fields That Differ By Age-Class And Cover Type, Kristel K. Bakker, Sarah L. Eggebo, Kenneth F. Higgins, David E. Naugle
Proceedings of the North American Prairie Conferences
During the past 50 years increasing agricultural practices have transformed native habitats into row~crop fields, making the Conservation Reserve Program (CRP) grass lands important habitat for wildlife populations. Limited information exists on how nongame grassland bird species relate to different stand ages and cover types of Conservation Reserve Program. Conservation Reserve Program grassland study sites (n = 42) were stratified by stand age (old [10-13 years] and new [0-3 years] grasslands), and cover types (CPI-cool-season grasslands and CPZ-warm-season grasslands) in eastern South Dakota. Field age rather than cover type was more predictive of grassland bird occurrence and density. Sedge wrens …
Impacts Of Agricultural Tillage On Grassland Birds In Western South Dakota, Julie R. Dejong, David E. Naugle, Kristel K. Bakker, Frank R. Quamen, Kenneth F. Higgins
Impacts Of Agricultural Tillage On Grassland Birds In Western South Dakota, Julie R. Dejong, David E. Naugle, Kristel K. Bakker, Frank R. Quamen, Kenneth F. Higgins
Proceedings of the North American Prairie Conferences
Xeric, mixed-grass landscapes are changing rapidly as native grasslands are converted to cropland. We surveyed birds to compare their use of grassland and cropland habitats and to evaluate whether their abundances were related to grassland fragment size. Surveys were conducted in western South Dakota at 146 sites that were stratified by habitat type, landscape composition and fragment size. The abundances of 13 of 14 species were 1.2-140 times higher in grass- lands than in cropland. Greater prairie-chicken, sharp-tailed grouse, burrowing owl, Baird's sparrow, northern harrier, and short-eared owl never occurred in cropland. Abundances of grasshopper sparrow, western meadowlark and chestnut-collared …
Ant-Mound Effects On Two Adjacent Prairies: Virgin And Plowed, Johanna Foster
Ant-Mound Effects On Two Adjacent Prairies: Virgin And Plowed, Johanna Foster
Proceedings of the North American Prairie Conferences
Mound-building Formica ants may be important biotic factors within prairie restorations because mounds found in virgin prairies can exist for decades, with densities up to 1,148 mounds/ha (465 mounds/acre). Research on the effects of Formica ant mounds on a virgin and an adjacent restored prairie (treatments) was established in 2003 near Olathe, Kansas; and it was expected that percent soil moisture, soil bulk density, plant species' distributions, and percent plant cover would be significantly affected. Data were collected from active mounds (28 in virgin prairie, 21 in restored prairie), and from paired off-mound sites 1 m (3 .3 ft) north …
Beyond Ecology: Bugs Reveal The Deep Roots Of Grassland Ecoregions, K. G.A. Hamilton
Beyond Ecology: Bugs Reveal The Deep Roots Of Grassland Ecoregions, K. G.A. Hamilton
Proceedings of the North American Prairie Conferences
Northern grassland faunas that were most affected by glaciation, induced climate shifts include more than 225 endemic phytophagous bugs (leafhoppers and related insects, the Homoptera,Auchenorrhyncha) on Canadian plains, and another 275 in Pacific Northwest intermontane grasslands. These exceptionally rich endemic faunas include many insect,plant associations common to related species of bugs, suggesting adaptation to certain environmental factors that persisted over millions of years despite radical environmental changes induced by glacial advances and retreats. Smaller, but significant, endemic faunas of Homoptera,Auchenorrhyncha in other glaciated areas also reveal patterns of ancient ecological areas. Groups of these grassland,endemic bugs are common to grassland …
Influence Of Matrix Elements On Prairie-Inhabiting Curculionidae, Tenebrionidae, And Scarabaeidae In The Palouse, Timothy D. Hatten, Sandford D. Eigenbrode, Nilsa A. Bosque-Pérez, Sarah Gebbie, Frank Merickel, Chris Looney
Influence Of Matrix Elements On Prairie-Inhabiting Curculionidae, Tenebrionidae, And Scarabaeidae In The Palouse, Timothy D. Hatten, Sandford D. Eigenbrode, Nilsa A. Bosque-Pérez, Sarah Gebbie, Frank Merickel, Chris Looney
Proceedings of the North American Prairie Conferences
It is well established that the invertebrate community in cropland under conservation-tillage (consT) is often enriched relative to the community under conventional-tillage (CT) systems. The question posed in this research is whether consT contributes to the maintenance of regional biodiversity and to the conservation of prairie-inhabiting species in agriculturally dominated landscapes that contain prairie remnants. During 2002, we sampled the grounddwelling beetle fauna of remnant Palouse prairie and surrounding cropland (under CT and consT) in the Palouse region of northwestern Idaho and southeastern Washington. Biological diversity of the representative taxa-Curculionidae (weevils), Tenebrionidae (darkling beetles) and Scarabaeidae (scarab beetles)-is significantly higher …
Could The Area-Sensitivity Of Some Grassland Birds Be Affected By Landscape Composition?, David Joseph Horn, Rolf R. Koford
Could The Area-Sensitivity Of Some Grassland Birds Be Affected By Landscape Composition?, David Joseph Horn, Rolf R. Koford
Proceedings of the North American Prairie Conferences
Several grassland bird species have been shown to be area sensitive. This area sensitivity occurs when a species' frequency of occurrence, or relative abundance, tends to be lower in smaller fields. The detection of area sensitivity, however, is not consistent among studies because a species may exhibit area sensitivity in one study, but not in another. We tested the hypothesis that a species' area sensitivity varies depending on the amount of grassland in the landscape. The study took place in central North Dakota during the 1996 and 1997 breeding seasons on 46 fields enrolled in the Conservation Reserve Program (CRP). …
Potential Habitat Factors Influencing Carrion Beetles Communities Of Palouse Prairie Remnants, Chris Looney, Benjamin T. Caldwell, Timothy D. Hatten, Christopher Lorion, Sanford D. Eigenbrode
Potential Habitat Factors Influencing Carrion Beetles Communities Of Palouse Prairie Remnants, Chris Looney, Benjamin T. Caldwell, Timothy D. Hatten, Christopher Lorion, Sanford D. Eigenbrode
Proceedings of the North American Prairie Conferences
The bunchgrass prairies of the Palouse region in eastern Washington state and adjacent Idaho were almost completely converted to agriculture in the past century. Today, prairie habitat exists only on small remnants scattered across the landscape. The invertebrate fauna of these habitat remnants is poorly known, both in terms of species diversity and community composition. Pitfall traps baited with carrion were used to sample carrion beetles (Coleoptera: Silphidae) during June and July of 2003. Prairie remnants were selected based on size to test whether habitat area influenced the diversity of this important insect community. Three size classes were identified; greater …
Adapting A Floral Biogeography Model To Prairie-Dependent Lepidoptera, Eric H. Metzler, John A. Shuey, Leslie A. Ferge, Richard A, Henderson, Paul Z. Goldstein
Adapting A Floral Biogeography Model To Prairie-Dependent Lepidoptera, Eric H. Metzler, John A. Shuey, Leslie A. Ferge, Richard A, Henderson, Paul Z. Goldstein
Proceedings of the North American Prairie Conferences
Analysis of data collected for a study of prairie dependent Lepidoptera in the northern tallgrass prairies showed four distributional patterns. A logical distributional pattern links species' distribution, i.e. Catocala abbreviatella, to larval host plants. Absence of larval host plant data, which is the case for most species of moths, requires inference based on habitat data of known specimens, i.e. Tarachidia binocula, or in the case of infrequently encountered species, i.e. Crambus murellus, capture data for a limited number of specimens. A fourth distributional pattern, i. e. Atrytone arogos, can be explained by hypotheses which explain the …
Freshwater Mussels (Bivalvia: Unionidae) In The Cajun Prairie Ecosystem In Southwestern Louisiana, Malcom F. Vidrine, Gail J. Quillman-Vidrine, Malcolm F. Vidrine Ii, Daniel J. Vidrine, Caroline E. Vidrine
Freshwater Mussels (Bivalvia: Unionidae) In The Cajun Prairie Ecosystem In Southwestern Louisiana, Malcom F. Vidrine, Gail J. Quillman-Vidrine, Malcolm F. Vidrine Ii, Daniel J. Vidrine, Caroline E. Vidrine
Proceedings of the North American Prairie Conferences
Freshwater mussels (Bivalvia: Unionidae) once cobbled the stream bottoms in the Cajun Prairie ecosystem in south-western Louisiana. The development of canal systems for aboveground irrigation of rice fields during the last century provided additional habitat-often the canals were likewise cobbled with mussels that formed diverse communities. This paper introduces the 31 known species, their general ecology and their distributions. These mussels develop a 'reef'-like benthic community that is home to a variety of plants and animals as parasites and haptobenthos. Freshwater mussels are on the decline numerically as well as in diversity as a result of human activity, namely loss …
Prairie Fen Preserved In An Urban Environment, Tyler Bassett
Prairie Fen Preserved In An Urban Environment, Tyler Bassett
Proceedings of the North American Prairie Conferences
Prairie fens are a rare, fire-dependent wetland type found only in the glaciated Midwest in ice-contact topography along streams or lake boundaries that historically occurred adjacent to prairies and savannas. Due to a strong dependence on cool, alkaline groundwater seepage, they are extremely sensitive to hydrological alterations that result from urban development. While prairie fens are common in glacial interlobate regions, it was still surprising to discover one while conducting a botanical inventory in 2001 in an urban development in Kalamazoo, Michigan. The 295-acre planned unit development (PUD), known as Parkview Hills, is bordered by medium-density residential neighborhoods, a major …
Conservation Efforts And Natural History Of A Prairie Habitat At Jennings Environmental Education Center, Pennsylvania, Bruno Borsari, David Johnson, Wil Taylor, Valentine Kefeli
Conservation Efforts And Natural History Of A Prairie Habitat At Jennings Environmental Education Center, Pennsylvania, Bruno Borsari, David Johnson, Wil Taylor, Valentine Kefeli
Proceedings of the North American Prairie Conferences
The habitat consideted in this study is a 19.8-acre (8.0-hectare) prairie relict, which is part of the 296-acre (120-hectare) park (Jennings Environmental Education Center), and it is located in northwest Pennsylvania (Butler County). This prairie remnant is one of the easternmost existing relicts of the once widespread post-glacial prairies. The focus of this paper is to present an overview of the natural history of the Jennings Prairie with emphasis on preservation practices that have occurred since its discovery, in 1905, and management approaches aimed at the conservation of this habitat. The maintenance of its 225 native plant species requires human …
Ecological Restoration As A Strategic Framework For Invasive Species Management Planning: The University Of Wisconsin Experience, Steve Glass
Proceedings of the North American Prairie Conferences
The UW-Madison Arboretum uses an evolving, strategic approach to invasive species management that aims to develop comprehensive, integrated protocols for removing pest plants and subsequently replacing them with appropriate native species. We seek to provide managers with the decision,making tools to develop appropriate tactics to encourage native plants and discourage pest plants. This approach relies upon: 1) a rigorous invasive species risk assessment that yields an action priority ranking matrix; and 2) invasive species management conducted within an ecological restoration framework; and 3) incorporation of research findings into management actions in an adaptive management feedback loop. I use Phalaris arundinacea …
Soil Chemistry Properties Under Two Different Management Practices: Clipped Saint Augustine Grass Lawn And Annually Burned Cajun Prairie, Domingo M. Jariel, Malcolm F. Vidrine, Nicole Bordelon, Janeel Al-Dujaili
Soil Chemistry Properties Under Two Different Management Practices: Clipped Saint Augustine Grass Lawn And Annually Burned Cajun Prairie, Domingo M. Jariel, Malcolm F. Vidrine, Nicole Bordelon, Janeel Al-Dujaili
Proceedings of the North American Prairie Conferences
Prescribed burning every two or more years is the recommended management practice to remove unnecessary invasive plants and to enhance the regrowth of desirable plants for the development of a fire-dependent plant community native to southwestern Louisiana. A portion of Saint Augustine grass lawn at Louisiana State University at Eunice (LSUE) was converted into a Cajun Prairie restoration plot in 1989. Since 1991, the adjacent lawn has been clipped weekly, whereas the prairie has been burned every January. The objective of this study was to determine the soil chemical properties of clipped lawn and burned prairie plots. Each plot (12 …
Ecological Restoration-Based Education Transforms Schoolgrounds And Education, Libby Mccann, Todd Miller
Ecological Restoration-Based Education Transforms Schoolgrounds And Education, Libby Mccann, Todd Miller
Proceedings of the North American Prairie Conferences
The University of Wisconsin- Madison Arboretum, home to the world's first prairie restoration, has a threefold mission to conserve and restore Arboretum lands, advance the science of restoration ecology, and foster the Land Ethic. Since 1991 , teams of teachers from more than 150 schools in Wisconsin have learned to incorporate ecological restoration into the curriculum through the Earth Partnership for Schools Program. This multi-disciplinary teacher professional development program emphasizes inquiry-based learning and multiple intelligences in a hands-on, collaborative setting. The majority of schools have focused their efforts on prairies. Recreating or restoring an ecological community on school grounds provides …
Grazing Intensity Effects On Vegetation, Livestock And Non-Game Birds In North Dakota Mixed-Grass Prairie, Eric D. Salo, Kenneth F. Higgins, Bob D. Patton, Kristel K. Bakker, William T. Barker, Brian Kreft, Paul E. Nyren
Grazing Intensity Effects On Vegetation, Livestock And Non-Game Birds In North Dakota Mixed-Grass Prairie, Eric D. Salo, Kenneth F. Higgins, Bob D. Patton, Kristel K. Bakker, William T. Barker, Brian Kreft, Paul E. Nyren
Proceedings of the North American Prairie Conferences
We conducted studies in native prairie mixed-grass pastures in south~central North Dakota (U.S.A.) during 1989- 2003 to determine how different grazing intensities affected structural characteristics of vegetation, livestock production and the occurrence and density of grassland birds. Generally, as grazing treatment intensity increased from light to extreme, mean vegetation structural values decreased for visual obstruction readings, tallest plants of grasses, forbs, and shrubs, and litter depth. Nineteen species of non-game birds were detected during 2001 and 2002. Overall breeding bird densities were negatively affected by increasing levels of grazing intensity in mixed-grass prairie. Claycolored sparrows (Spizella pallida), grasshopper …
Spatial Patterns Of Canopy And Sub-Canopy In Managed And Unmanaged Oak Savanna, Joy J. Wolf
Spatial Patterns Of Canopy And Sub-Canopy In Managed And Unmanaged Oak Savanna, Joy J. Wolf
Proceedings of the North American Prairie Conferences
The oak savanna in the Midwest was maintained historically in part by fire, topography, climate, and other factors. After agriculture, which left only large fencerow trees, park management of fire, mowing and other minor factors to restore clusters of oaks has proceeded at different frequencies at different sites since the 1960s. I asked how different management frequencies created a range of spatial patterns and composition in the canopy. I compared three 0.37-ha sites that were unmanaged, or managed with more or less frequency by spatially mapping all woody species to the nearest 25 m2 The oak trees, dominated by …
Abstracts For Other Oral Presentations
Abstracts For Other Oral Presentations
Proceedings of the North American Prairie Conferences
Abstracts for Other Oral Presentations pp.1-26
Seed Mass And Morphology In Outcrossing And Selfing Species Of Clarkia (Onagraceae): An Sem Study, Jennifer L. Knies, Veronique A. Delesalle, A. R. Cavaliere
Seed Mass And Morphology In Outcrossing And Selfing Species Of Clarkia (Onagraceae): An Sem Study, Jennifer L. Knies, Veronique A. Delesalle, A. R. Cavaliere
Biology Faculty Publications
Seeds from three pairs of outcrossing-selfing sister taxa from the genus Clarkia (farewell-to-spring, Onagraceae)—Clarkia unguiculata, Clarkia exilis, Clarkia xantiana ssp. xantiana and ssp. parviflora, and Clarkia concinna ssp. concinna and ssp. automixa—were studied to assess the effects of contrasting mating systems on seed mass and seed morphology. For each outcrossing-selfing comparison, the seed mass of the selfing taxon was less than that of the outcrossing taxon. Seed mass typically differed significantly among populations within a taxon. Scanning electron microscopy showed that the seeds from all these taxa share several characteristics: a bullet to shield shape, a reticulate exotesta pattern, presence …
Adaptive Responses Of Paleoindians To Cold Stress On The Periglacial Northern Great Plains, Alan J. Osborn
Adaptive Responses Of Paleoindians To Cold Stress On The Periglacial Northern Great Plains, Alan J. Osborn
Department of Anthropology: Faculty Publications
Archaeologists' cumulative knowledge about Paleoindians has grown substantially during the past two decades, and accomplishments have been impressive. I find, however, that much of the research regarding the archaeology of the Paleoindian period is primarily descriptive and highly particularistic. In this essay, I propose that our understanding of Paleoindian artifact assemblages, associated ecofactual materials, and human remains can be more meaningful within a broader biophysical context. We must ask how the archaeological record of the Late Glacial period might provide paleoanthropologists with greater insights into early hunter-gatherer anatomy, physiology, diet, health, and behavior. I propose that our understanding of hunter-gatherer …
Hunter-Gatherers In Jackson Hole, Wyoming: Testing Assumptions About Site Function, Kenneth P. Cannon, Dawn R. Bringelson, Molly Boeka Cannon
Hunter-Gatherers In Jackson Hole, Wyoming: Testing Assumptions About Site Function, Kenneth P. Cannon, Dawn R. Bringelson, Molly Boeka Cannon
Department of Anthropology: Faculty Publications
The settlement-subsistence pattern of hunter-gatherers in Jackson Hole, Wyoming, has been viewed historically as an economic system organized around the altitudinal distribution of seasonally ripening food crops and has come to be known as high country adaptation (HCA). Although this study does not take issue with the basic tenet of the modelhunter- gatherer movement through altitudinal zones for the exploitation of seasonally available resources-we critically assess the normative functional interpretations presented by previous investigators. We examine artifacts in three lithic assemblages from southern Jackson Hole in terms of the organization of technology as a means to investigate each locale's function …
Pearl, Volume 13, 2004, Rollins College Students
Pearl, Volume 13, 2004, Rollins College Students
The Pearl
Yearly magazine of creative and other writings from undergraduates and faculty of Rollins College Brevard Campus, sponsored by the Rollins English Department.
Use Of An Artificial Pond And Marshes By Amphibians And Reptiles In West Virginia, Vanessa A. Dozeman
Use Of An Artificial Pond And Marshes By Amphibians And Reptiles In West Virginia, Vanessa A. Dozeman
Theses, Dissertations and Capstones
A farm pond approximately 40 years old located in Wayne County, West Virginia was studied to determine the ingress and egress of amphibians and reptiles. In addition to the pond, 2 small marshes were also examined. The study extended from February 2003 to November 2003. The pond is approximately 36 m long and 38 m wide and is located on a south-facing hillside at 202 m in elevation. A drift fence composed of landscaping cloth was constructed to completely encircle the site. At every 5.15 m, funnel traps were positioned on both sides of the fence. Traps were checked daily …
The Influence Of Schooling On Cognitive Development: Spatial Language, Encoding And Concept Development In India And Nepal, Pierre R. Dasen, Ramesh Mishra, Shanta Niraula
The Influence Of Schooling On Cognitive Development: Spatial Language, Encoding And Concept Development In India And Nepal, Pierre R. Dasen, Ramesh Mishra, Shanta Niraula
Papers from the International Association for Cross-Cultural Psychology Conferences
No abstract provided.
Relative Burdens: Family Ties And The Safety Net, Lee Anne Fennell
Relative Burdens: Family Ties And The Safety Net, Lee Anne Fennell
Articles
No abstract provided.
Should The Rules Of Marital Property Be Normative?, Carolyn J. Frantz
Should The Rules Of Marital Property Be Normative?, Carolyn J. Frantz
Articles
No abstract provided.