Digital Commons Network^™

Cameras, Satellites, And Surveys: A Multi-Platform Approach To Monitoring Lake Conservation Behavior, Daniel D. Homeier

Honors Theses

Shoreline buffers are essential to maintaining lake water quality and there are numerous methods for their assessment. There is uncertainty in the benefits and drawbacks of different shoreline buffer assessment methods. In this study I explore three methods of remotely assessing shoreline buffers in the Belgrade Lakes Region of Maine: household surveys, geotagged shoreline photos, and satellite imagery. By comparing these three methods I will evaluate their accuracy and applicable scale when used to assess the presence and quality of shoreline buffers.

I used both parametric and non-parametric analysis to (1) evaluate the relative accuracy of 154 household surveys in …

Using Participatory Scenarios To Stimulate Social Learning For Collaborative Sustainable Development, Kris A. Johnson, Genya Dana, Nicholas R. Jordan, Kathy J. Draeger, Anne Kapuscinski

Dartmouth Scholarship

Interdependent human and biophysical systems are highly complex and behave in unpredictable and uncontrollable ways. Social and ecological challenges that emerge from this complexity often defy straightforward solutions, and efforts to address these problems will require not only scientific and technological capabilities but also learning and adaptation. Scenarios are a useful tool for grappling with the uncertainty and complexity of social-ecological challenges because they enable participants to build adaptive capacity through the contemplation of multiple future possibilities. Furthermore, scenarios provide a platform for social learning, which is critical to acting in the face of uncertain, complex, and conflict-laden problems. We …

The Influence Of Seawater And Sulfate Reduction On Phosphate Release From Tidal Wetland Soils In The St. John’S River, Florida, Asher Williams

UNF Graduate Theses and Dissertations

Climate change and increasing sea level elevation are predicted to increase salinity in estuarine tidal wetlands in the Southeastern United States. Since much of the ecosystem function in these areas is predicated upon salinity regimes, many fundamental changes are likely to occur as a result. The influence of salinity and SO4 2- reduction on PO4 3- release from tidal wetland soils was evaluated along a salinity gradient at three sites in The St. John’s River, Florida using both field and laboratorybased methods. Porewater was sampled over the course of 10 months to determine ambient levels of SO4 2- and PO4 …

Decision Strategies For A P2p Computing System, Grzegorz Chmaj, Krzysztof Walkowiak

Electrical & Computer Engineering Faculty Research

Peer-to-Peer (P2P) computing (also called ‘public-resource computing’) is an effective approach to perform computation of large tasks. Currently used P2P computing systems (e.g., BOINC) are most often centrally managed, i.e., the final result of computations is created at a central node using partial results – what may be not efficient in the case when numerous participants are willing to download the final result. In this paper, we propose a novel approach to P2P computing systems. We assume that results can be delivered to all peers in a distributed way using three types of network flows: unicast, Peer-to-Peer and anycast. We …

Sustainability Cultural Indicators, J. Callewaert, Roslynn Brain, L. C. Malan

Environment and Society Faculty Publications

No abstract provided.

Cytotoxicity Of Aloe Vera Gel Extracts On Allium Cepa Root Tip Cells, Ali̇ İrfan İlbaş, Umut Gönen, Semi̇h Yilmaz, Mehmet Yaşar Dadandi

Turkish Journal of Botany

Aloe vera L. is a valuable medicinal plant and is currently used in pharmaceutical, cosmetic, and food industries worldwide. In the present study, the effect of various concentrations of Aloe vera leaf gel extracts was investigated on mitotic and phase indexes of Allium cepa L. root tip cells for 24 and 48 h durations. The EC_{50} value of gel extracts was found to be 20% and was used to determine the experimental concentrations. The results indicated that the mitotic index and root growth rate of A. cepa were considerably decreased in comparison to the control. We found that the cytotoxic …

The Management Of Feral Pig Socio-Ecological Systems In Far North Queensland, Australia, Gabriela Shuster

Antioch University Dissertations & Theses

The development of management programs for socio-ecological systems that include multiple stakeholders is a complex process and requires careful evaluation and planning. This is particularly a challenge in the presence of intractable conflict. The feral pig (Sus scrofa) in Australia is part of one such socio-ecological system. There is a large and heterogeneous group of stakeholders interested in pig management. Pigs have diverse effects on wildlife and plant ecology, economic, health, and social sectors. This study used the feral pig management system as a vehicle to examine intractable conflict in socio-ecological systems. The purpose of the study was …

Covariation Between Understorey Light Environments And Soil Resources In Bornean Mixed Dipterocarp Rain Forest, Sabrina E. Russo, Lin Zhang, Sylvester Tan

School of Biological Sciences: Faculty Publications

Variation in understorey irradiance is both a cause and consequence of the structure and dynamics of closed-canopy forests, which are also influenced by soil nutrients and water availability. We tested the hypothesis that understorey light regimes differ among four mixed dipterocarp forest types that share the same rainfall, but grow on different soils along an edaphic gradient at one site in Borneo. Based on data from photosynthetically active radiation sensors deployed at 1-m height at 36 locations for 351 sensor-days, we found significant soil-related variation in irradiance. The more productive forest types on clay and fine loam had lower daily …

Influence Of Anomalous Dry Conditions On Aerosols Over India: Transport, Distribution And Properties, Dimitris G. Kaskaoutis, Ritesh Gautam, Ramesh P. Singh, E. E. Housos, D. Goto, S. Singh, A. Bartzokas, P. G. Kosmopoulos, Manish Sharma, N. C. Hsu, B. N. Holben, T. Takemura

Mathematics, Physics, and Computer Science Faculty Articles and Research

A synergy of satellite and ground-based radiometric observations, along with chemical transport modeling, was used for the assessment of the influence of drought monsoon conditions of 2002 and prolonged dry pre-monsoon period of 2003 on aerosol properties over south Asia, with emphasis over northern India. Reanalysis data are also examined for studying the dry anomalous period from the climatological mean, that show prevalence of westerlies under anticyclonic circulation and subsidence favoring the accumulation of aerosols. TRMM observations over south Asia indicate significant rainfall deficit over northwestern India in July 2002 and May-June 2003. Subsequently, the anomalous and prolonged dry conditions …

Shoreline Changes In Point Pelee, Canada: An Airphoto-Based Analysis, Abdullah Bamasoud

Theses and Dissertations (Comprehensive)

Shoreline retreat has significant consequences for Point Pelee National Park’s (PPNP) ecological and economic systems. In this study, the shoreline changes of PPNP are examined in terms of their rates, their relationship to natural and anthropogenic influences, and methods for predicting shoreline positions.

The rates of shoreline change are analyzed for the period 1959-2004 using ortho-airphotos. The eastern shoreline of the Park exhibited varying recession in both rising and falling Lake Erie water level, especially in the Northeast Beach, where it averaged -3.14 m˖y-1. The western shoreline of the Park generally exhibited accretion and had an inverse relationship with Lake …

The Effect Of Compost Amendment On Ammonia-Oxidizing Microbial Community Structure In An Agricultural Soil, Gregory S. Klinger

Graduate Theses, Dissertations, and Problem Reports (ETD)

The effect of compost amendment on nitrification rates and ammonia-oxidizing microorganisms in an agricultural soil was examined. Four different rates from 11.2 to 89.6 Mg compost ha-1 of partially composted dairy manure was applied annually from 2000 to 2003 and again in 2005 to 32 plots on a Dormont silt loam that was shifted from long term pasture to crop cultivation. An additional 8 plots were not amended with compost and served as negative controls. Except for lime in the initial year of the experiment, no other fertilizer was used on these plots. Soil physical, chemical, and biochemical measurements were …

Comparing Middle School Students' Learning And Attitudes In Face-To-Face And Online Mathematics Lessons, Clayton M. Edwards

Dissertations and Theses @ UNI

Online learning has become a staple within education for college students, and has started to enter high schools. While this instructional delivery system has been shown to work for older students, few studies have involved middle school students. If this trend toward online teaching of younger students continues, online learning could become a large part of education for middle school students, making research in this area important.

Multiple positive and negative aspects have been identified for online learning. Positive characteristics include individualized pacing; electronic resources, and the opportunity for rapid or personalized feedback, while negative aspects address increased student responsibility …

The Impact Of Socioscientific Issues Based Curriculum Involving Environmental Outdoor Education For Fourth Grade Students, Karey Burek

USF Tampa Graduate Theses and Dissertations

There is a divide between what students are being taught within the science classroom and what they experience out in the real world. This study sought to explore possible relationships between a socioscientific issues embedded curriculum and outcome variables addressing environmental attitude and knowledge, oral and written argumentation and critical thinking skills. Both quantitative and qualitative methods were used to examine both within and between class differences as well as individual differences between the beginning and end of a semester of elementary school. Results indicated that socioscientific issues assist students in developing their critical thinking skills while also providing students …

Landscape-Level Controls On Dissolved Carbon Flux From Diverse Catchments Of The Circumboreal, Suzanne E. Tank, Karen E. Frey, Robert G. Striegl, Peter A. Raymond, Robert M. Holmes, James W. Mcclelland, Bruce J. Peterson

Geography

While much of the dissolved organic carbon (DOC) within rivers is destined for mineralization to CO2, a substantial fraction of riverine bicarbonate (HCO3-) flux represents a CO2 sink, as a result of weathering processes that sequester CO2 as HCO 3-. We explored landscape-level controls on DOC and HCO3- flux in subcatchments of the boreal, with a specific focus on the effect of permafrost on riverine dissolved C flux. To do this, we undertook a multivariate analysis that partitioned the variance attributable to known, key regulators of dissolved C flux (runoff, lithology, and vegetation) prior to examining the effect of permafrost, …

Artification In Natural History Museums, Kaisa Mäki-Petäjä

Contemporary Aesthetics (Journal Archive)

Natural history exhibitions have changed considerably over recent decades concurring with a rise of a general movement of aestheticization in the Western culture. This usually results from an attempt to make the exhibitions more appealing to provide the public numerous ways of enjoying themselves, but they are also used to communicate information, especially of an ethical and affective kind. In this paper I will consider the effects of a particular kind of aestheticization, namely artification, of these kinds of exhibitions. Artification, i.e, the process of regarding non-art objects as art, appears to be in conflict with the science-based purposes of …

Developing A Geospatial Protocol For Coral Epizootiology, Jennifer Anne Lentz

LSU Doctoral Dissertations

This dissertation explores how geographic information systems (GIS) and spatial statistics, specifically the techniques used to map, detect, and spatially analyze disease epidemics, could be used to advance our understanding of coral reef health. Given that different types of spatial analysis, as well as different parameter settings within each analysis, can produce noticeably different results, poor selection or improper use of a given technique would likely lead to inaccurate representations of the spatial distribution and false interpretations of the disease. For this reason, I performed a comprehensive review of the following types of exploratory spatial data analysis (ESDA): mapping and …

Effect Of Air Pollution On Daily Morbidity In Karachi, Pakistan, Haider Khwaja, Zafar Fatmi, Daniel Malashock, Zafar Aminov, Ambreen Kazi, Azhar Siddique, Jahanzeb Qureshi Qureshi, David Carpenter

Community Health Sciences

Levels of daily particulates (PM2.5) were monitored at two sites in Karachi, Pakistan. One site (Korangi) is an industrial and residential neighborhood, while the other (Tibet Center) is a commercial and residential area near a major highway. Monitoring was done daily for a period of six weeks during spring, summer, fall and winter. Particulate levels were extraordinarily high, with the great majority of days falling into the “unhealthy for sensitive groups” or “very unhealthy” categories. The mean PM2.5 levels in Karachi exceeded the WHO’s 24 h air quality guideline almost every day and often by a factor of greater than …

Reproduction Of Twentieth Century Intradecadal To Multidecadal Surface Temperature Variability In Radiatively Forced Coupled Climate Models, Patrick Thomas Brown

Master's Theses

Coupled Model Intercomparison Project 3 simulations that included time varying radiative forcings were ranked according to their ability to consistently reproduce twentieth century intradecadal to multidecadal (IMD) surface temperature variability at the 5° by 5° spatial scale. IMD variability was identified using the running Mann Whitney Z method. Model rankings were given context by comparing the IMD variability in preindustrial control runs to observations and by contrasting the IMD variability among the ensemble members within each model. These experiments confirmed that the inclusion of time-varying external forcings brought simulations into closer agreement with observations. Additionally, they illustrated that the magnitude …

Growing Greens And Soiled Soil: Trends In Heavy Metal Contamination In Vegetable Gardens Of San Francisco, Jennifer Gorospe

Master's Theses

As urban dwellers prioritize eating locally grown foods to reduce environmental impacts, benefit the local economy, and bring fresh produce to the table, urban gardening has emerged as a popular approach to improving food security. Researchers have shown previously that urban landscapes can accumulate environmental toxins at levels that may be unsafe for human health, with socioeconomically disadvantaged communities often shouldering an unequal burden of exposure. In order to identify and predict likely risk to gardeners, in this study, soil samples from 91 vegetable gardens in the city of San Francisco were analyzed for 16 heavy metals. A majority of …

How Smart Is Ceqa About Climate Change? An Evaluation Of Ceqa's Greenhouse Gas Analysis, Papia Kowshal

Master's Theses

Analysis of greenhouse gas (GHG) emissions under the California Environmental Quality Act (CEQA) is an emerging practice, which, if done correctly, could contribute significantly towards meeting California's GHG emission reduction goals set under the Global Warming Solution Act of 2006. Whether CEQA analysis is adequate in assessing climate impacts of GHG emissions has yet to be determined.

In this research, I evaluated the quality of climate change analyses in the draft environmental impact reports (DEIRs) prepared for 14 mixed-use projects in California. Results of this research indicated that CEQA analysis did not adequately include the effects of population density around …

Producing Short And Long Run Projections For The Ecological Footprint, David Gordon Moore

Master's Theses

The Ecological Footprint is a useful tool for public awareness of ecological pressures and for policymakers who aim to reduce them. In order to determine the potential effects of future actions and policies, it is necessary to construct scenarios of future global conditions, both in the short-term and long-term. This study develops two alternative methods for creating Ecological Footprint scenarios: first using asymmetric changes in simple economic output (GDP) to look at short-term projections; then using widely accepted scenarios from international agencies to develop long-term projections.

Changes in GDP were found to be causal in determining changes in the Ecological …

Feral Cat Management: Perceptions And Preferences (A Case Study), Rachel Lm Wilken

Master's Theses

Feral cat management is a highly debated topic. Trap, Neuter, and Return (TNR) programs have become increasingly popular as an alternative to eradication. Public preference about how to manage feral cats has been explored by previous authors, but no consensus has been reached. Public policy and best management practices depend in part upon public opinion on this topic. Wording of a feral cat management preference in surveys can play a role in respondent opinion. For this thesis, the researcher examined public opinion about feral cat control by surveying 298 Stanford University faculty and staff members using two different communication approaches. …

The Biology And Ecology Of Six Rare Plants From Plumas National Forest, Northern California, Usa, Suzie Woolhouse

Master's Theses

The majority of our knowledge about the natural world has come from the study and observation of common species, yet a significant portion of species in the world are rare. In this study, biological and ecological data was collected for six rare taxa from Plumas National Forest. The taxa were Monardella stebbinsii, Monardella follettii (Lamiaceae), Lewisia cantelovii (Montiaceae), Cypripedium californicum, Cypripedium fasciculatum (Orchidaceae) and Clarkia mildrediae subsp. mildrediae (Onagraceae). The two Monardella's and Cypripedium californicum are serpentine endemics, and the Lewisia is found growing both on and off serpentine. Five sites were visited per species, and soil samples …

Rural Water Development In Sub-Saharan Africa: A Comparative Study Between Uganda And Tanzania, Paola De Cecco

Master's Theses

Global transnational efforts to achieve the Millennium Development Goal of halving the world population lacking access to improved water supplies are failing to address sustainable development in sub-Saharan rural communities. These efforts have been driven largely by water governance strategies centered on the controversial principle that water is an economic good, and as such, the development of water services shall be left to the supply-demand mechanisms regulating commodities' markets. Uganda and Tanzania have embraced these strategies to varying degrees and have made strikingly different progress in developing their rural water sector. Uganda has maintained a steady rate of improvement in …

Analyzing The Impact Of County Radon Levels And Population Size On The Allocation Of The State Indoor Radon Grant (Sirg) Funds, Stephen Douglas De Jong

Master's Theses

This thesis examines the SIRG program's effectiveness to target funds to states with the highest risk potential, based on county radon levels and population size. The primary method of determining the program's effectiveness was an analysis of the program's allocation of funds at a regional as well as a state level. The analysis focused on two of four input variables that the EPA utilizes in its regional allocation model (e.g., county radon levels and population size).

The analysis showed that the state-level allocation of funds is only marginally related to a combination of county radon levels and population size, while …

The Effects Of Restored Aquatic Large Woody Debris Structures On Invertebrate Populations In The Napa River, Clayton Christopher Leal

Master's Theses

Agricultural encroachment and habitat destruction within the riparian zone of many California ecosystems have created a need for restoration of stream hydrology in order to enhance and support native flora and fauna. On the Napa River, adjacent vineyards have caused the channel to become deeply incised, so that the stream now lacks geomorphic variability and biodiversity. In order to restore channel complexity, large woody debris (LWD) structures were installed in the river in the summer of 2010. In this study I evaluated the effects of installing LWD structures within the Napa River on benthic invertebrates in the first year after …

A Descriptive Study Of Old-Growth Sequoia Sempervirens Growth Form And Canopy Structure On A Pygmy Forest Ecotone In Mendocino County, Zuhayl Rochin Lambert

Master's Theses

The tallest tree in the world is the coast redwood, Sequoia sempervirens, a species endemic to a 16-km-wide coastal belt extending from Big Sur, California, to southern Oregon. Old-growth redwood forests are home to other plant and animal species that depend on structural characteristics that have formed over hundreds of years. While a great deal of research regarding growth form and structure has taken place on highly productive stands, little work has been done on marginal sites, where redwoods are on the edge of their ecological tolerance. In the Northern California County of Mendocino, hydrophobic spodosol are host to …

La Integración De La Dimensión Ambiental En Una Institución De Educación Superior, Geralda Díaz

Abraham S. Fischler College of Education ETD Archive

El estudio consistió en identificar los conocimientos y actitudes ambientales en los estudiantes de Psicología, a partir de los cuales se proponen estrategias de aprendizaje para la inserción de la dimensión ambiental como herramienta para aumentar el grado de conocimiento y actitud proambiental en una Institución de Educación Superior. Existen estudios que demuestran que las universidades han hecho esfuerzos por actualizar el currículo en todas las carreras, con el propósito de dotar de conocimientos y competencias a sus egresados sobre la dimensión ambiental. Sin embargo, los esfuerzos no han logrado materializarse en todas las universidades. La institución objeto de estudio …

An Overview Of Online Resources For Climate Adaptation Policies Relating To New England Regional, State And Local Municipalities, Nels Schnobrich

Sea Grant Law Fellow Publications

No abstract provided.

New Peace Garden Brings Fresh Food To Community, Sylvia Zukowski '12

News and Events (Discontinued Series)

No abstract provided.