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Articles 31 - 60 of 134
Full-Text Articles in Entire DC Network
The Impacts Of The Introduced European Green Crab, Carcinus Maenas, On Selected Bivalves And Meiofaunal Communities, Zasha A. Bassett
The Impacts Of The Introduced European Green Crab, Carcinus Maenas, On Selected Bivalves And Meiofaunal Communities, Zasha A. Bassett
Dissertations and Theses
This thesis examines the potential impact of the invasive green crab, Carcinus maenas, in Yaquina Bay, Oregon. I sampled the current extent of crab colonization in the intertidal zone of Yaquina Bay using a standardized trapping regimen in selected intertidal sites in August and September 1999. I also evaluated the potential impacts of C. maenas on the commercially important bivalve, Crassotrea gigas. Carcinus' preferred size ranges of C. gigas and other species were experimentally determined. Additionally, Carcinus species preference for C. gigas was examined in relation to two common bivalves, Mytilus trossolus and Macoma nasuta. Experiments were …
Chronic Arsenic Exposure And Risk Of Infant Mortality In Two Areas Of Chile, Claudia Hopenhayn-Rich, Steven R. Browning, Irva Hertz-Picciotto, Catterina Ferreccio, Cecilia Peralta, Herman Gibb
Chronic Arsenic Exposure And Risk Of Infant Mortality In Two Areas Of Chile, Claudia Hopenhayn-Rich, Steven R. Browning, Irva Hertz-Picciotto, Catterina Ferreccio, Cecilia Peralta, Herman Gibb
Preventive Medicine and Environmental Health Faculty Publications
Chronic arsenic exposure has been associated with a range of neurologic, vascular, dermatologic, and carcinogenic effects. However, limited research has been directed at the association of arsenic exposure and human reproductive health outcomes. The principal aim of this study was to investigate the trends in infant mortality between two geographic locations in Chile: Antofagasta, which has a well-documented history of arsenic exposure from naturally contaminated water, and Valparaíso, a comparable low-exposure city. The arsenic concentration in Antofagasta's public drinking water supply rose substantially in 1958 with the introduction of a new water source, and remained elevated until 1970. We used …
Volume 37, Number 38: June 2, 2000, University Of North Dakota
Volume 37, Number 38: June 2, 2000, University Of North Dakota
University Letter Archive
No abstract provided.
Effects Of Towed Demersal Fishing Gear On Biogenic Sediments: A 5-Year-Study, Jm Hall-Spencer
Effects Of Towed Demersal Fishing Gear On Biogenic Sediments: A 5-Year-Study, Jm Hall-Spencer
School of Biological and Marine Sciences
Experimental scallop fishing was carried out using towed commercial dredges on sediments deposited by unattached coralline algae in order to quantify their sensitivity to damage from current fishing practices. These biogenic sediments are patchily distributed in European coastal waters (to -30 m depth around the UK and to -120 m in the Mediterranean) and are of international conservation importance. This paper describes the short and long-term effects of scallop dredging on previously unfished and fished areas of biogenic algal sediment in SW Scotland. Sediment cores taken biannually from 1994-99 were used to assess live coralline abundance on marked test and …
Determination Of The Wavelength Dependence On The Metal Catalyzed Degradation Of The Herbicide Atrazine, Timothy Bertram
Determination Of The Wavelength Dependence On The Metal Catalyzed Degradation Of The Herbicide Atrazine, Timothy Bertram
Honors Theses
Since the advent of modern herbicide use in the early twentieth century, researchers have been plagued with the obvious problem of herbicide disposal. Most herbicides are specifically designed to resist natural degradation processes so that they can remain effective in the field for a substantial amount of time. In addition, they are also made water soluble so that they can be easily applied to crops. Finally, they are specifically produced to kill undesirable plant species in the quickest and often crudest fashions. Due to these specific properties herbicides pose a general threat to other organisms living in the same geographic …
Graphic Design And Ecology, Luzuozi Wang
Spectator 2000-05-04, Editors Of The Spectator
The Impacts Of A Nonindigenous Marine Predator In A California Bay, Edwin D. Grosholz, Gregory M. Ruiz, Cheryl A. Dean, Kim A. Shirley, John L. Maron, Peter G. Connors
The Impacts Of A Nonindigenous Marine Predator In A California Bay, Edwin D. Grosholz, Gregory M. Ruiz, Cheryl A. Dean, Kim A. Shirley, John L. Maron, Peter G. Connors
Biological Sciences Faculty Publications
Coastal marine ecosystems worldwide are being altered rapidly by the invasion of nonindigenous species. Unlike terrestrial and freshwater systems, the impacts of an invading species have never been quantified on multiple trophic levels for a marine food web. We measured the impact of the nonindigenous green crab, Carcinus maenas, on a coastal marine food web in central California and found that this predator exerted strong “top-down” control, significantly reducing the abundances of several of the 20 invertebrate species monitored over a 9-yr period. Densities of native clams, Nutricola tantilla and Nutricola confusa, and native shore crabs, Hemigrapsus oregonensis, showed 5-fold …
Influence Of Treefall Gaps On Distributions Of Breeding Birds Within Interior Old-Growth Stands In Bialowieza Forest, Poland, Robert J. Fuller
Influence Of Treefall Gaps On Distributions Of Breeding Birds Within Interior Old-Growth Stands In Bialowieza Forest, Poland, Robert J. Fuller
Condor
No abstract provided.
Mycorrhizal Associations In Opuntia Humifusa In Southern Illinois, Sean Andrew Whitcomb
Mycorrhizal Associations In Opuntia Humifusa In Southern Illinois, Sean Andrew Whitcomb
Honors Theses
No abstract provided.
Remote Sensing And Geographic Information Systems For Decision Analysis In Public Resource Administration: Case Study In A Southwestern Watershed, William G. Kepner
Remote Sensing And Geographic Information Systems For Decision Analysis In Public Resource Administration: Case Study In A Southwestern Watershed, William G. Kepner
UNLV Theses, Dissertations, Professional Papers, and Capstones
Alternative futures analysis is a scenario-based approach to regional land planning that attempts to synthesize existing scientific information in a format useful to community decision makers. Typically, this approach attempts to investigate the impacts of several alternative sets of choices preferred by representative stakeholder groups relative to selected environmental or economical endpoints. Potential impacts from each of the scenarios are compared to current conditions of the region in terms of a set of processes that are modeled within a geographic information system. Future conditions are generally examined from the perspective of a recent baseline condition (versus empirically determined using a …
Food Habits Of The Allegheny Woodrat (Neotoma Magister ), Nikole Lee Castleberry
Food Habits Of The Allegheny Woodrat (Neotoma Magister ), Nikole Lee Castleberry
Graduate Theses, Dissertations, and Problem Reports (ETD)
Regional declines in Allegheny woodrat (Neotoma magister ) populations suggest a better understanding of the ecology of this species is needed for proper management. I described seasonal food habits of the Allegheny woodrat in the Ridge and Valley and Allegheny Plateau physiographic provinces of West Virginia and Virginia using microhistological techniques. In the Allegheny Plateau, the top 5 food items were fungi, blueberries ( Vaccinium spp.), acorns (Quercus spp.), ferns ( Dryopteris spp.), and lichens. In the Ridge and Valley woodrats ate primarily blackberry (Rubus spp.) leaves, fungi, greenbrier (Smilax spp.) leaves, acorns, and oak leaves. Additionally, we examined the …
Noneconomic Barriers To Health Care Utilization By African-Americans, Johnie M. Tarver Phd, Msn, Rn
Noneconomic Barriers To Health Care Utilization By African-Americans, Johnie M. Tarver Phd, Msn, Rn
Dissertations
Many efforts have been made to maximize the utilization of health cue system. As a result the utilization of health care system by African Americans has increased, improving the health status (Blendon, Aiken, Freeman, & Corey, 1989). While some improvements have been made, recent reports show disparities between African Americans and Caucasians in the utilization of health care systems and in their health status. Barriers have been identified among those in the lower social economic status (SES). These barriers impede health care utilization and negatively affect health status. However, studies show that among some African Americans when health care is …
Iwu May Term Class Takes Students To Presidential Conventions, Heather Hahn
Iwu May Term Class Takes Students To Presidential Conventions, Heather Hahn
News and Events (Discontinued Series)
No abstract provided.
The Role Of Community Support Programs With Mothers And Fathers Who Are Mentally Ill, Deborah A. Hesli
The Role Of Community Support Programs With Mothers And Fathers Who Are Mentally Ill, Deborah A. Hesli
Theses and Graduate Projects
Although issues faced by adults with mental illness have been visible for centuries, the implications of mental illness on parenting have only recently been considered. Consequently, service providers in the mental health field have begun to examine their roles with these families, such as balancing the rights of the parent with disabilities with the vulnerabilities of the children. This study asked service providers in the mental health field about their roles working with parents with mental illness and their children. A questionnaire was completed by twenty-one Community Support Program staff working in an urban setting with parents with a mental …
Fishlines, 2000, N/A N/A
Spectator 2000-04-12, Editors Of The Spectator
Molecular Evolution Of Insecticidal Spore-Forming Bacteria, John Pool
Molecular Evolution Of Insecticidal Spore-Forming Bacteria, John Pool
Honors Theses
Molecular methods are increasingly being used to determine the phylogeny of microorganisms. This research was intended to determine phylogenetic relationships for bacteria of the species Bacillus thuringiensis and other members of the Bacillus cereus group. Each strain was analyzed by its sasp-B gene sequence to determine its species classification and relation to other strains studied. Results of this study indicated that according to the sasp-B gene tree, the species Bacillus thuringiensis is a paraphyletic with respect to both Bacillus cereus and Bacillus anthracis. Some unexpected results and implications for species designations are also discussed.
Seasonal Comparison Of Remotely Sensed Relative Forest Ecosystem Temperature Zones With Topography And Forest Biomass In The Clear Springs Wilderness Area Of The Shawnee National Forest, Daniel Unger
Faculty Presentations
The use of thermal infrared data to delineate seasonal relative forest ecosystem temperature zones as a tool for forest ecological studies was analyzed. Analysis involved: (1) delineating relative seasonal forest ecosystem temperature zones within the Clear Springs Wilderness Area of the Shawnee National Forest using Landsat Thematic Mapper thermal infrared data; and, (2) quantifying the effect of topography and forest biomass on relative forest ecosystem temperature zones within seasons. Results indicate that slope was statistically uncorrelated with relative temperature zones within any season, aspect was statistically correlated with relative temperature zones during fall and winter, and forest biomass was statistically …
Spring 2000, Mary Beth Hinton
Spring 2000, Mary Beth Hinton
Newsletters from University Library - Library Connection
No abstract provided.
Predicting Vintage Quantity And Quality In Coastal California Using Pacific Sea Surface Temperatures, Ramakrishna R. Nemani, Michael A. White, Daniel R. Cayan, Gregory V. Jones, Steven W. Running
Predicting Vintage Quantity And Quality In Coastal California Using Pacific Sea Surface Temperatures, Ramakrishna R. Nemani, Michael A. White, Daniel R. Cayan, Gregory V. Jones, Steven W. Running
Numerical Terradynamic Simulation Group Publications
California produces 90% of all wine within the U.S. and dominates the $33 billion/year domestic retail wine industry. Since the 1950s, wine grape growers in California have seen dramatic increases in premium wine quality, grape yield, and crop value. Advances in viticultural practices (irrigation, nutrition, pest/disease control, trellising etc.) and experience in wine making have certainly contributed to the success (Jackson and Lombard 1993). In spite of such advances, wine growers generally believe climate plays a significant role in determining the quantity and quality of a given vintage.
Feeding Habits Of Young-Of-Year Striped Bass, Morone Saxatilis, And White Perch, Morone Americana, In Lower James River, Va, Paul J. Rudershausen, Joseph G. Loesch
Feeding Habits Of Young-Of-Year Striped Bass, Morone Saxatilis, And White Perch, Morone Americana, In Lower James River, Va, Paul J. Rudershausen, Joseph G. Loesch
Virginia Journal of Science
A total of 188 young-of-year (YOY) striped bass, Morone saxatilis, and 199 YOY white perch, Morone americana, were collected by pushnet, seine and trawl during 24-hour periods from June through August, 1992 in lower James River, Virginia. The purpose was to identify prey and temporal and spatial feeding habits. Copepods were the most numerous prey of both species. Fishes and mysids comprised the largest volumetric percentage of diets of striped bass and white perch, respectively. Using an index of relative importance, leptodorids and copepods were the most important prey of striped bass and white perch, respectively. Both species …
International Groundwaters: The Upper San Pedro River Basin Case, Hector M. Arias
International Groundwaters: The Upper San Pedro River Basin Case, Hector M. Arias
Natural Resources Journal
No abstract provided.
Multiple Source Pools And Dispersal Barriers For Galápagos Plant Species Distribution, J. Alan Yeakley, John F. Weishampel
Multiple Source Pools And Dispersal Barriers For Galápagos Plant Species Distribution, J. Alan Yeakley, John F. Weishampel
Environmental Science and Management Faculty Publications and Presentations
We reexamined geographic factors explaining the number of plant species on islands in the Galápagos Archipelago. We hypothesized that plant species richness (S) was related to the number of source pools and that plant species dispersal preferentially followed direct, oceanic pathways. To test different dispersal pathways from multiple source pools, the total number of islands within a given dispersal radius (i) was posed as the sum of the number of line-of-sight islands (Ci) and of the number of islands without line-of sight connection (Bi). In partial regression analyses, controlling for nearest island area (A2) …
Ecological Studies Of Wolves On Isle Royale, 1999-2000, Rolf O. Peterson
Ecological Studies Of Wolves On Isle Royale, 1999-2000, Rolf O. Peterson
Ecological Studies of Wolves on Isle Royale
Annual Report 1999-2000
Volume 37, Number 29: March 24, 2000, University Of North Dakota
Volume 37, Number 29: March 24, 2000, University Of North Dakota
University Letter Archive
No abstract provided.
Volume 37, Number 28: March 17, 2000, University Of North Dakota
Volume 37, Number 28: March 17, 2000, University Of North Dakota
University Letter Archive
No abstract provided.
Spectator 2000-02-24, Editors Of The Spectator
Unh Scientist Explores Seaweed Aquaculture, Sharon Keeler
Unh Scientist Explores Seaweed Aquaculture, Sharon Keeler
Media Relations
No abstract provided.
Unh Scientist Explores Seaweed Aquaculture, Sharon Keeler
Unh Scientist Explores Seaweed Aquaculture, Sharon Keeler
Media Relations
No abstract provided.