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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A mechanisation study of systems for the use of straw

Magowan, T. J. January 1987 (has links)
No description available.
2

Current real estate development industry usage of sustainable forestry products in the Southeast

January 2012 (has links)
0 / SPK / specialcollections@tulane.edu
3

Linking Individual Biological Outcomes to Resource Use

Ayers, Christopher Ryan 15 August 2014 (has links)
Minimum resource requirements support population persistence; however, ecologists and conservationists often want to identify factors that improve biological outcomes of animals. The population-level approach common in wildlife-resource studies limits our ability to draw inferences about the importance of resources and other factors by failing to link them with individual fitness. Measuring individual-based biological outcomes and resource use helps determine variation in mechanistic relationships between animal fitness and behavior. I suggest using direct metrics of resource use such as food consumption and distance traveled, to avoid errors with estimating resource availability. I summarize these concepts in an analytical framework for modeling relationships between resource use and fitness to guide readers toward effective study designs. I also describe constraints on an animal’s ability to use resources freely, which must be considered when modeling these relationships to account for additional sources of variation in biological outcomes. I investigated effects of resource use on body condition, survival, and reproduction using field data from four species of vertebrates. I found that using multiple predictor metrics to model biological outcomes allows comparison between factors affecting fitness. In general, factors more closely relating to energetics (e.g., movement pattern or distance traveled) were more useful predictors of animal outcome than metrics of habitat use or selection. Management and conservation efficiency can be improved by focusing efforts on preventing detrimental risks and threats, and supporting less stressful access to beneficial resources rather than supporting average population habitat use without consideration of biological outcomes. Improving the study of ecology depends in part on our efforts to seek finer-scaled mechanistic observations of relationships among individual organism behavior, resource use, and biological outcomes that improve our understanding of population-level resource ecology. Melding current techniques to obtain detailed evidence of how habitat is used at an individual level will allow us to relate resources to fitness for more efficiently understanding an animal’s ecology and improving conservation and control of populations. While we will continue to manage for populations, we must not lose sight of the individual variation that drives natural selection if we want to fully understand variation in resource-outcome relationships.
4

Temporal Variation in Space and Resource Use of Macaws in the Southeastern Peruvian Amazon

Adamek, Krista Anne 2011 May 1900 (has links)
Space use and resource use of three species of macaws (Ara ararauna, A. chloropterus, and A. macao) were studied for a period of three years in the southeastern Peruvian Amazon. Basic information on wild macaw populations is lacking due to the logistical and behavioral challenges of working with these species in dense rainforest. Population declines world-wide have been attributed significantly to a reduction in food and nesting resources due to habitat loss. This research aims to obtain baseline data on macaws in a region with relatively intact rainforest. Specific objectives were to (1) quantify space use, describe the spatial and temporal variation in movement patterns, explore habitat selection and spatial pattern of resources during the non-breeding season, and (2) identify key nesting and foraging species and determine whether there is seasonal variation in diet, and explore how resources may be related to movements and competition. Individuals from each species were radio-tagged and monitored from 2004 to 2008 by ground, platform, and aerial tracking. Seasonal ranges were estimated using MCP and KDE methods. Diversity and niche measurements and selection were calculated for dietary items, nesting substrate, and habitat. The relationship between palm habitat distribution and A. ararauna movements was explored using landscape analysis techniques. All species had similar home range sizes during the breeding season, ranging from a mean of 1,540 ha to 2,541 ha. Non-breeding ranges were significantly larger for A. ararauna (117,849 ha). Greater than 200 species of plants were consumed, yet seasonal preferences vary. The increase in dietary breadth and decrease in overlap during dry season is unlikely related to food scarcity or competition. Key nesting and dietary species include Mauritia flexuosa, Dipterix micrantha, and Bertholletia excelsa. Palm habitat is a key resource for Ara ararauna and associated with long-distance movements. This research addresses a critical gap in our knowledge regarding macaw movements and resource use in Amazonian rainforest. Despite their mobility, their low fecundity and specialized nesting requirements can impact reproductive success and population growth if habitat loss continues on its current trajectory.
5

Exploring the Ecological Footprint of Tourism in Ontario

Johnson, Peter January 2003 (has links)
Once considered a 'green' industry, tourism and its associated ecological impacts are now widely acknowledged. Focus within tourism planning has aimed to reduce the ecological burden placed on a destination area, and move towards a more sustainable tourism industry. This research proposes the use of the Ecological Footprint (EF) as a tool to compare the ecological costs of different types of tourism. The EF shows the relative amount of productive land appropriated by the activities and choices of an individual tourist. The main goal of this study was to analyse and compare the ecological resource use of tourism in Ontario. Surveys were conducted with tourists staying at 9 different types of accommodations throughout Ontario. Additional data were collected from personal interviews with accommodation managers at each location and incorporated into the EF calculation. Four areas of tourism ecological impact were identified; tourists' personal consumption, transportation, activity, and accommodation costs. These four components contributed in varying degrees to each tourist Ecological Footprint, and this variation became the main area of analysis. The findings of this research demonstrated that air travel contributes significantly to the total ecological cost of a particular tourism experience. Comparably, travel by personal car made a much smaller contribution to the tourist EF. Thus, local area tourists who could drive to a destination had a smaller EF than those long-distance domestic and international tourists who flew. Accommodation ecological costs were primarily a factor of the amount of built space available, and total energy usage per guest. Accommodations that had a large number of occupants for a given area and level of energy consumption achieved a scale of efficiency. In this manner, larger, more efficiently constructed accommodations often made smaller contributions to the tourist EF than small-scale, but inefficient accommodations. The main conclusion was that the ecological impacts of tourism can be quantitatively recorded, and that a complete trip view of tourism ecological resource use is necessary. When considering practical applications in the tourism industry, an Ecological Footprint analysis could be used by tourism managers as an evaluative tool to compare the ecological outcome of various construction, programming, and operational changes. For the tourist, the EF can serve as an 'eco-label', to distinguish one type of 'green' tourism from another, creating a more informed consumer. Ultimately, the Ecological Footprint serves one purpose- to demonstrate that less ecologically consumptive tourism choices are possible for both tourists and tourism managers.
6

Exploring the Ecological Footprint of Tourism in Ontario

Johnson, Peter January 2003 (has links)
Once considered a 'green' industry, tourism and its associated ecological impacts are now widely acknowledged. Focus within tourism planning has aimed to reduce the ecological burden placed on a destination area, and move towards a more sustainable tourism industry. This research proposes the use of the Ecological Footprint (EF) as a tool to compare the ecological costs of different types of tourism. The EF shows the relative amount of productive land appropriated by the activities and choices of an individual tourist. The main goal of this study was to analyse and compare the ecological resource use of tourism in Ontario. Surveys were conducted with tourists staying at 9 different types of accommodations throughout Ontario. Additional data were collected from personal interviews with accommodation managers at each location and incorporated into the EF calculation. Four areas of tourism ecological impact were identified; tourists' personal consumption, transportation, activity, and accommodation costs. These four components contributed in varying degrees to each tourist Ecological Footprint, and this variation became the main area of analysis. The findings of this research demonstrated that air travel contributes significantly to the total ecological cost of a particular tourism experience. Comparably, travel by personal car made a much smaller contribution to the tourist EF. Thus, local area tourists who could drive to a destination had a smaller EF than those long-distance domestic and international tourists who flew. Accommodation ecological costs were primarily a factor of the amount of built space available, and total energy usage per guest. Accommodations that had a large number of occupants for a given area and level of energy consumption achieved a scale of efficiency. In this manner, larger, more efficiently constructed accommodations often made smaller contributions to the tourist EF than small-scale, but inefficient accommodations. The main conclusion was that the ecological impacts of tourism can be quantitatively recorded, and that a complete trip view of tourism ecological resource use is necessary. When considering practical applications in the tourism industry, an Ecological Footprint analysis could be used by tourism managers as an evaluative tool to compare the ecological outcome of various construction, programming, and operational changes. For the tourist, the EF can serve as an 'eco-label', to distinguish one type of 'green' tourism from another, creating a more informed consumer. Ultimately, the Ecological Footprint serves one purpose- to demonstrate that less ecologically consumptive tourism choices are possible for both tourists and tourism managers.
7

Sustainable development: a case study of the natural resource use of Yelwa Village, Nigeria

Korndoerfer, Tammy Linda January 2009 (has links)
The world today faces many challenges. Reducing poverty and protecting the environment are prominent amongst these challenges, and consequently both are high on priority lists for many national, international, governmental and non-governmental organizations. Since the 1980s there has been an increasing awareness that environmental protection must not fly in the face of social justice, especially in developing countries, and that a system can only truly achieve sustainability if it is socially just and economically sound, as well as environmentally secure. Likewise poverty reduction at the cost of the environment is worthless in the long term. This has given rise to much more holistic approaches to both conservation and poverty reduction policies and brought the rights of communities living in or near protected areas into the international focus. However, wether it is possible to conserve biodiversity and protect habitats successfully without undermining the livelihoods of local communities, or wether it is possible to offer development aid to an impoverished region without jeopardizing their local environment, is a question which has not been resolved. This study approaches this debate by examining the relationship between the livelihoods and natural resources of a rural village adjacent to a forest reserve on the Mambilla Highlands in Nigeria. A mixture of qualitative and quantitative techniques were employed during five months spent living on location to develop a picture of the situation as it currently exists, the environmental effects of development in the village to date, and the effects of these environmental changes on people’s livelihoods. Based on this research this thesis concludes that development in a region certainly increases the vulnerability of the environment. However, rather than concluding that this makes development and environmental protection conflicting agendas, this thesis argues that this period of vulnerability presents opportunities to develop true sustainability, as effective sustainable practices can develop from the experience of resource depletion. Additionally, examples of how knowledge sharing and dialogue between western scientists and indigenous communities has the potential to facilitate and accelerate this process are discussed.
8

Sustainable Development: A case study of the natural resource use of Yelwa Village, Nigeria

Korndoerfer, Tammy Linda January 2009 (has links)
The world today faces many challenges. Reducing poverty and protecting the environment are prominent amongst these challenges, and consequently both are high on priority lists for many national, international, governmental and non-governmental organizations. Since the 1980s there has been an increasing awareness that environmental protection must not fly in the face of social justice, especially in developing countries, and that a system can only truly achieve sustainability if it is socially just and economically sound, as well as environmentally secure. Likewise poverty reduction at the cost of the environment is worthless in the long term. This has given rise to much more holistic approaches to both conservation and poverty reduction policies and brought the rights of communities living in or near protected areas into the international focus. However, wether it is possible to conserve biodiversity and protect habitats successfully without undermining the livelihoods of local communities, or wether it is possible to offer development aid to an impoverished region without jeopardizing their local environment, is a question which has not been resolved. This study approaches this debate by examining the relationship between the livelihoods and natural resources of a rural village adjacent to a forest reserve on the Mambilla Highlands in Nigeria. A mixture of qualitative and quantitative techniques were employed during five months spent living on location to develop a picture of the situation as it currently exists, the environmental effects of development in the village to date, and the effects of these environmental changes on people’s livelihoods. Based on this research this thesis concludes that development in a region certainly increases the vulnerability of the environment. However, rather than concluding that this makes development and environmental protection conflicting agendas, this thesis argues that this period of vulnerability presents opportunities to develop true sustainability, as effective sustainable practices can develop from the experience of resource depletion. Additionally, examples of how knowledge sharing and dialogue between western scientists and indigenous communities has the potential to facilitate and accelerate this process are discussed.
9

Essays in rural energy, forest dependency and covariates of fuel saving technologies in Ethiopia

Beyene, Abebe Damte 08 May 2012 (has links)
This thesis contains empirical findings on rural energy, forest resource use and fuel saving technologies in Ethiopia. Using a household survey data conducted in different parts of the country, efforts were made to contribute to the limited empirical evidences in Africa in general and Ethiopia in particular. The thesis has four empirical chapters and the first and the last chapters of the thesis are the introduction and summary, respectively. The main findings and policy implications are highlighted below. The second chapter examines the coping mechanisms of rural households to fuel wood scarcity. Using randomly selected households, the results of the empirical analysis show that rural households residing in forest degraded areas respond to fuel wood shortages by increasing their labor input to fuel wood collection. The study also finds that there is no evidence for the substitution between fuel wood and dung or fuel wood and crop residues. Supply side strategies alone may not be effective in addressing the problem of forest degradation and biodiversity losses. Any policy on natural resource management in general and rural energy problems in particular should make a distinction between regions of different forest degradation level. The third chapter examines the relationship between property rights and household demand for fuel wood, as measured by the source from which fuel wood is collected. Results from the discrete choice model indicate that active local-level institutions reduce the dependency on community forests, but, otherwise, increase household dependency on open access forests. However, land tenure security and local level institutions do not increase demand for fuel wood collected from private forests. The results suggest that there is a need to bring more open access forests under the management of the community and increase the quality of community forestry management in order to realize improvements in forest conservation. The fourth chapter of this thesis deals with finding empirical evidence on the role of local level institutions and property right regimes on forest dependency using data from a random sample of rural households in Ethiopia. We find that forest dependency is negatively correlated to the wealth status of the household. Our estimation results suggest that local level institutions are not significant factors in determining use of non wood forest products unlike major forest products such as timber or woody materials in general. We also find that there is a need to expand the current practice of participatory forest management to other open access forest areas. We conclude that generalization on the forest-poverty link depends on the type of forest management and the specific characteristics that prevail in the area. The last chapter of the thesis deals with finding empirical evidence on the determinants of adoption of different types of fuel saving technologies in urban Ethiopia. The duration analysis suggests that adoption rates have been increasing over time, that income and wealth are important contributors to adoption, and that substitute technologies tend to hinder adoption of Lakech charcoal stove. However, it was not possible to consider prices or perceptions related to either the technologies or biomass availability in the duration models, and, therefore, further research is needed in order to further inform policy with respect to household technology adoption decisions. / Thesis (PhD)--University of Pretoria, 2012. / Economics / unrestricted
10

How common ravens (Corvus corax) exploit anthropogenic food sources through time and space in a semi-transformed, alpine environment

Jain, Varalika 16 February 2022 (has links)
From large-scale agriculture and farming to concentrated fishing discards, garbage dumps, game carcasses and bird feeders, human action has been increasingly affecting natural systems and animal species through the deliberate and unintentional provisioning of food resources. Anthropogenic food sources (AFSs) are often more spatially concentrated, easily accessible, abundant and stable than natural food sources. The common raven, Corvus corax, is a behaviourally flexible and ecologically adaptable species that has managed to thrive in human transformed landscapes by exploiting these anthropogenic sources of food. The aim of this research was to investigate how raven individuals vary in their use of different AFSs through space and time. I used data from a long-term GPS tracking initiative in the Upper Austrian Alps to investigate (1) the space-use of non-breeding raven individuals across this landscape to answer the questions: (2) what types of AFSs are most extensively used by ravens in this landscape, and what factors predict individual variation in AFS use (i.e., apparent reliance on and access to resources), specifically (3a) the number of AFSs visited and (3b) the probability of being at AFSs at any given point in time. Movement patterns can reveal information on the foraging decisions made by individuals, including how they use different AFSs. Non-breeding raven individuals exhibited great variation in how they moved around and used the landscape. The number of AFSs visited, but not the probability of being at an AFS (at any given point in time), varied among individuals with different ranging behaviour and of different age class (i.e., juvenile and adults) and origin (i.e., captive-bred-released and wild-caught), suggesting that experience affects AFS-use. Non-breeders differed in their use of AFSs by season, visiting the highest number of AFSs but having the lowest probability being present at an AFS in winter, potentially indicative of high foraging competition under stressful environmental conditions. They were also found to extensively exploit resources in spring, both visiting high numbers of AFSs and having a high probability of being present at an AFS, perhaps due to decreased competition (e.g., from breeders) and increases in food availability. The category (i.e., wildpark, refuse site, hut) of AFSs also influenced the probability of an individual being present at the site, likely because of differences in resource quality, quantity and replenishing rate. A very few foraging sites were highly popular, while over half attracted less than 5 individuals throughout the study. By exploiting AFSs, raven population numbers have increased across their range, raising conservation concerns (i.e., predation on threatened species and human-wildlife conflict). With a better understanding of the patterns of AFS-use and the factors influencing these patterns, I suggest that strategies to manage ravens in this semi-transformed, alpine environment should focus on controlling the supply of food at AFSs at a regional scale.

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