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Identifying Socio-ecological Factors Influencing the Use of Prescribed Fire to Maintain and Restore Ecosystem Health in Texas, USA and Northern Chihuahua, MexicoToledo, David 02 October 2013 (has links)
There is a critical need for more studies to identify socio-ecological drivers that affect conservation and management of fire adapted ecosystems, yet studies that identify such variables and explore their interaction in specific systems are not only scarce but limited to only a few systems. Although information on the socio-ecological effects of prescribed fire application exists, there is no integrative framework that simultaneously considers the interplay between social and ecological factors affecting the use of prescribed fires. Fire suppression, together with other human and natural disturbances in grassland systems that are adapted to episodic fire, are the major factors that have contributed to the recruitment of woody species into grasslands worldwide. Even though the ecology of restoring these fire prone systems back to a grassland state is becoming clearer, the major hurdle to reintroducing historic fire at a landscape scale is its social acceptability. To address these deficiencies, I studied the socio-ecological factors influencing the use of prescribed fire in Texas, USA and Chihuahua, Mexico using a combination of quantitative and qualitative approaches to examine how social and ecological factors affect ecosystem conservation and management of semi-arid grassland systems. For the Texas case study I used quantitative survey data analyzed using logistic regression models and structural equation models. For the Mexico case study I used qualitative interviews gathered using a snowball network sampling approach and coded them based on the analytic themes of land cover change, institutional failure, market drivers, and population dynamics.
Results from the Texas case study suggest that risk taking orientation and especially, perceived support from others when implementing prescribed burns, play important roles in determining attitudes towards the use of high-intensity prescribed fires, which are sometimes needed to restore ecosystems. Results from the Texas case study also highlight how membership in Prescribed Burn Associations (PBAs) influence land manager decisions regarding the use of prescribed fire by reducing concerns over lack of skills, knowledge and resources. Results emphasize the potential for PBAs to reduce risk concerns regarding the application of prescribed fire and are relevant to management of brush encroached areas. Through PBAs, effective landscape-scale solutions to the brush encroachment problem can be achieved in Texas.
Results from the Mexico case study show how fire stopped effectively being a driving factor on this system decades ago. Socio-political and ecological changes at the national, and international level produced changes in land use disrupting historical fire patterns and contributing to the ecological deterioration of the area. Droughts combined with poor management practices have depleted the fuel needed to carry a fire. Landowners also face safety and legal concerns but in most cases, even if a landowner decided to implement a prescribed burn, an ecological threshold has been crossed and current fine fuel loads (grass) are insufficient to carry a fire that is sufficiently intense to reduce brush cover and restore grassland and savanna ecosystems.
Based on my findings I can conclude that ecologically sound adaptive management and social capital are fundamental components of the livelihoods of landowners and land managers in both case studies. Work and investment that is focused on strengthening this social capital will have the most profound effects in maintaining the integrity of grassland systems at a landscape scale.
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Temperature swing adsorption compression and membrane separationsMoate, Joseph R. January 1900 (has links)
Thesis (Ph. D. in Chemical Engineering)--Vanderbilt University, Dec. 2009. / Title from title screen. Includes bibliographical references.
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An artificial life approach to evolutionary computation: from mobile cellular algorithms to artificial ecosystemsVulli, Srinivasa Shivakar, January 2010 (has links) (PDF)
Thesis (M.S.)--Missouri University of Science and Technology, 2010. / Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed July 19, 2010) Includes bibliographical references (p. 57-60).
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Attitudes towards Ecosystem Services in Urban Riparian ParksJanuary 2012 (has links)
abstract: Urban sustainability is a critical component of sustainable human societies. Urban riparian parks are used here as a case study seeking to understand the social-ecological relationships between the subjective evaluation of ecosystem services and the vision and management of one kind of green infrastructure. This study explored attitudes towards ecosystem services, asking whether 1) the tripartite model is an effective framing to measure attitudes towards ecosystem services; 2) what the attitudes towards ecosystem services are and whether they differ between two types of park space; and 3) what the relationship is between management and the attitudinal assessment of ecosystem services by park users. A questionnaire was administered to 104 urban riparian park users in Phoenix, AZ evaluating their attitudes towards refugia, aesthetics, microclimate and stormwater regulation, and recreational and educational opportunities. The operationalization of the tripartite model was validated and found reliable, but may not be the whole story in determining attitudes towards ecosystem services. All components of attitude were positive, but attitudes were stronger in a habitat rehabilitation area with densely planted native species and low flows, than in a more classic park with mowed lawns and scattered vegetation, a mix of native and non-native species, and open water. Park users were more positive towards refugia, stormwater regulation, recreation, and educational opportunities in the habitat rehabilitation area. On the other hand, microclimate regulation and aesthetic qualities were valued similarly between the two parks. Most attitudes supported management goals, however park users valued stormwater regulation less than managers. Qualitative answers suggest that the quality of human interactions differ between the parks and park users consider both elements of society and the physical environment in their subjective evaluations. These findings reveal that park users highly value ecosystem services and that park design and management mediates social-ecological relationships, which should at least underlie the context of economic discussions of service value. This study supports the provision of ecosystem services through green infrastructure and suggests that an integration of park designs throughout urban areas could provide both necessary services as well as expand the platform for social-ecological interactions. / Dissertation/Thesis / M.S. Sustainability 2012
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An investigation into the relationship between exposure to violence, resilience and PTSD in a sample of psychology students at the University of the Western CapeNortje, Carla Anne January 2018 (has links)
Magister Artium - MA (Psychology) / Post-apartheid South Africa has been marked by high levels of trauma resulting from
exposure to violence. Many South Africans are therefore at risk for developing Posttraumatic
Stress Disorder (PTSD). Despite a large body of research identifying various protective
factors which may influence an individual's response to a traumatic event, a gap in South
African research on the relationship between exposure to multiple traumatic experiences,
protective factors and the development of PTSD was identified. Therefore, located within the
systems theory framework, the aim of this study was to investigate the relationship between
demographic characteristics, types of exposure to trauma and resilience associated with the
development of posttraumatic stress (PTS) when there are multiple exposures to trauma. A
quantitative, cross-sectional, exploratory study on 158 psychology students at the University
of the Western Cape was undertaken. Using a non-random, convenience sampling method,
data were collected by means of four self-report questionnaires namely; a biographical
questionnaire, the Life Events Checklist for DSM-5 (LEC-5), the Resilience Scale for Adults
(RSA), and the Posttraumatic Stress Disorder Checklist for DSM-5 (PCL-5).
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“We monitor by living here”: actualization of a social-ecological monitoring program grounded in Gitga’at harvesters’ observations and knowledgeThompson, Kim-Ly 24 December 2018 (has links)
The academic community and government agencies are increasingly recognizing how Indigenous knowledge can enrich environmental monitoring and inform adaptation in complex social-ecological systems. Indeed, Indigenous peoples have been monitoring, managing, and adapting to their environments for thousands of years. Despite the impacts of ongoing colonialism, many Indigenous peoples continue to monitor and exert their knowledge and governance systems through ongoing use and relationship with their traditional territories. This Master’s research grew from the Gitga’at First Nation’s Oceans and Lands Department desire to formally include the knowledge and observations of their land and sea users as part of contemporary stewardship initiatives.
The primary objective of this research was to provide a framework for an ongoing monitoring system based in the observations and knowledge of Gitga’at harvesters. In order to meet this objective, I asked three main research questions: 1. How has Indigenous knowledge interacted with environmental monitoring initiatives, and what are characteristics of effective and self-sustaining monitoring initiatives that engage Indigenous knowledge?; 2. What methods of Indigenous knowledge documentation and communication are best suited to the needs and objectives of the Gitga’at First Nation?; and 3. How does ongoing use and occupancy of Gitga’at territory inform community-based monitoring?
I first conducted a review of the literature on Indigenous knowledge and environmental monitoring to explore the ways in which Indigenous peoples and their knowledges have been engaged in other monitoring initiatives. I found that Indigenous knowledge has been engaged in a number of ways ranging from traditional land-based activities providing holistic social-ecological monitoring indicators, to the employment of Indigenous field technicians for externally-drive monitoring initiatives. Effective projects involved high degrees of community participation or direction; were built on partnerships based on trust and respect for various knowledge systems; used multiple methods to document and communicate Indigenous knowledge; and had institutional links between monitoring and management bodies.
To answer my second research question, I followed a participatory case study approach in partnership with Gitga’at co-researchers. We began with informal interviews with 36 knowledge holders to gauge interest in the project and to establish monitoring objectives. These were followed by two community meetings and 12 workshops to design methods for documenting their observations. We then iteratively designed and tested these methods over the course of two traditional harvest seasons. We interviewed 23 participants following the spring 2017 harvest season and 27 after the fall/winter 2017 harvest season. We also conducted 4 semi-structured interviews with department leaders to ensure that the information gathered was meeting the needs of the Gitga’at Oceans and Lands Department, Treaty Negotiators, the Hartley Bay School and the Gitga’at Health Department. Key outcomes are a harvest logbook, and an interview guide to be administered by community researchers following each harvest season.
To answer my third research question, I conducted a conceptual framework analysis on the notes and transcripts taken while designing and testing a monitoring program based in the observations and knowledge of Gitga’at land and sea users. An interconnected set of social-ecological concepts and indicators that are monitored by Gitga’at harvesters emerged. The framework I developed based on conversations about Gitga’at monitoring through harvesting activities highlights the importance of maintaining and revitalizing Indigenous knowledge and harvesting practices in order to continue social-ecological monitoring, as well as opportunities for scientific approaches to situate themselves within Indigenous frameworks and priorities.
This research provides the Gitga’at First Nation with foundations from which to pursue ongoing documentation of observations and knowledge produced through harvesting activities as a form of social-ecological monitoring. It also serves as a guide for other Indigenous nations that wish to embark on similar initiatives. Amidst discussions of marine and coastal resource co-management in British-Columbia and Indigenous resurgence, this research adds to the literature that re-enforces the importance of Indigenous governance and access to their lands and waters, and the continuation of Indigenous relationships to the land and sea in order to inform social-ecological monitoring for the benefit of all. / Graduate
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Measuring the Sustainability of Protected Area-Based Tourism Systems: A Multimethod ApproachJanuary 2014 (has links)
abstract: This research assessed the sustainability of protected area-based tourism systems in Nepal. The research was composed of three interrelated studies. The first study evaluated different approaches to protected area governance. This was a multiple-case study research involving three protected areas in Nepal: the Annapurna Conservation Area, Chitwan National Park, and the Kanchenjunga Conservation Area. Data were collected from various published and unpublished sources and supplemented with 55 face-to-face interviews. Results revealed that outcomes pertaining to biodiversity conservation, community livelihoods, and sustainable tourism vary across these protected areas. The study concluded that there is no institutional panacea for managing protected areas. The second study diagnosed the sustainability of tourism in two destination communities: Ghandruk and Sauraha, which are located within the Annapurna Conservation Area and Chitwan National Park, respectively. A systemic, holistic approach--the social-ecological system framework--was used to analyze the structures, processes, and outcomes of tourism development. Data collection involved 45 face-to-face semi-structured interviews and a review of published and unpublished documents. Results revealed that tourism has several positive and a few negative sociocultural, economic, and ecological outcomes in both communities. Overall, tourism has progressed towards sustainability in these destinations. The third study examined tourism stakeholders' perspectives regarding sustainable tourism outcomes in protected areas. The study compared the responses of residents with residents, as well as tourists with tourists, across the Annapurna Conservation Area and Chitwan National Park. Tourism sustainability was evaluated with six tourism impact subscales measuring negative and positive ecological, economic, and social impacts. Data were collected using the survey method. Respondents included 230 residents and 205 tourists in Annapurna, and 220 residents and 210 tourists in Chitwan. The findings revealed that the residents across these protected areas perceived positive and negative impacts differently, as did the tourists, suggesting that the form of tourism development affects the sustainability outcomes in protected areas. Overall, this research concluded that protected areas and tourism are intricately related, and sustainable management of a protected area-based tourism system requires a polycentric adaptive approach that warrants a broad participation of relevant stakeholders. / Dissertation/Thesis / Doctoral Dissertation Community Resources and Development 2014
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Naturalizing Sustainability Discourse: Paradigm, Practices and Pedagogy of Thoreau, Leopold, Carson and WilsonJanuary 2015 (has links)
abstract: ABSTRACT
Understanding complex and adaptive socio-ecological systems (SES) to deal with our most challenging and overlapping problems such as global climate change, biodiversity loss, and rising consumption rates requires sustainability theory that is commensurate with these problems’ size and complexity. The received United Nations-based sustainability framework aims to achieve a balance among three pillars—economics, environment, and social equity—for today and for future generations. Yet, despite applying this sustainability framework for over a quarter of a century, the Earth is less sustainable, not more. Theoretical trade-offs between environmental conservation and economic growth have often reinforced business-as-usual practices and educational paradigms, and emphasized economic values over ecological limits.
How can the principles of foundational naturalists help clarify, enhance, and advance sustainability discourse? I propose that the principles of Henry David Thoreau (1817-1862), Aldo Leopold (1887-1948), Rachel Carson (1907-1964), and Edward O. Wilson (1927-), express a worldview that captures and integrates a range and depth of historical, normative, economic, ecological, scientific, and social values for a viable and applicable discourse of sustainability.
This analytical study relies on (i.) textual analysis and interpretation of four key naturalists and humanists, (ii.) analysis of secondary sources that illuminate their proto- ecological and sustainability principles, and (iii.) interviews with leading sustainability scholars. Because these thinkers integrate science and ethics, natural history and philosophy, ecology and society, and environmental and economic problems within a holistic worldview, I call them systems naturalists. Their transdisciplinary worldview of one holistic system, with economics subordinated to environmental limits, links important values from the natural sciences and the humanities. The writings and examples of systems naturalists provide more robust historical sustainability principles that can help solve our most challenging SES problems by synthesizing a broad range of knowledge in the sciences, social sciences, and the humanities to inform sustainability paradigm, practices, and pedagogy. / Dissertation/Thesis / Doctoral Dissertation Sustainability 2015
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Ecology and the City: A Long-Term Social-Ecological Examination of the Drivers and Diversity of Urban VegetationJanuary 2015 (has links)
abstract: Often, when thinking of cities we envision designed landscapes, where people regulate everything from water to weeds, ultimately resulting in an ecosystem decoupled from biophysical processes. It is unclear, however, what happens when the people regulating these extensively managed landscapes come under stress, whether from unexpected economic fluctuations or from changing climate norms. The overarching question of my dissertation research was: How does urban vegetation change in response to human behavior? To answer this question, I conducted multiscale research in an arid urban ecosystem as well as in a virtual desert city. I used a combination of long-term data and agent-based modeling to examine changes in vegetation across a range of measures influenced by biophysical, climate, institutional, and socioeconomic drivers. At the regional scale, total plant species diversity increased from 2000 to 2010, while species composition became increasingly homogeneous in urban and agricultural areas. At the residential scale, I investigated the effects of biophysical and socioeconomic drivers – the Great Recession of 2007-2010 in particular – on changing residential yard vegetation in Phoenix, AZ. Socioeconomic drivers affected plant composition and increasing richness, but the housing boom from 2000 through 2005 had a stronger influence on vegetation change than the subsequent recession. Surprisingly, annual plant species remained coupled to winter precipitation despite my expectation that their dynamics might be driven by socioeconomic fluctuations. In a modeling experiment, I examined the relative strength of psychological, social, and governance influences on large-scale urban land cover in a desert city. Model results suggested that social norms may be strong enough to lead to large-scale conversion to low water use residential landscaping, and governance may be unnecessary to catalyze residential landscape conversion under the pressure of extreme drought conditions. Overall, my dissertation research showed that urban vegetation is dynamic, even under the presumably stabilizing influence of human management activities. Increasing climate pressure, unexpected socioeconomic disturbances, growing urban populations, and shifting policies all contribute to urban vegetation dynamics. Incorporating these findings into planning policies will contribute to the sustainable management of urban ecosystems. / Dissertation/Thesis / Doctoral Dissertation Biology 2015
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The Semiotic Nature of Power in Social-Ecological SystemsJanuary 2017 (has links)
abstract: Anderies (2015); Anderies et al. (2016), informed by Ostrom (2005), aim to employ robust
feedback control models of social-ecological systems (SESs), to inform policy and the
design of institutions guiding resilient resource use. Cote and Nightingale (2012) note that
the main assumptions of resilience research downplay culture and social power. Addressing
the epistemic gap between positivism and interpretation (Rosenberg 2016), this dissertation
argues that power and culture indeed are of primary interest in SES research.
Human use of symbols is seen as an evolved semiotic capacity. First, representation is
argued to arise as matter achieves semiotic closure (Pattee 1969; Rocha 2001) at the onset
of natural selection. Guided by models by Kauffman (1993), the evolution of a symbolic
code in genes is examined, and thereon the origin of representations other than genetic
in evolutionary transitions (Maynard Smith and Szathmáry 1995; Beach 2003). Human
symbolic interaction is proposed as one that can support its own evolutionary dynamics.
The model offered for wider dynamics in society are “flywheels,” mutually reinforcing
networks of relations. They arise as interactions in a domain of social activity intensify, e.g.
due to interplay of infrastructures, mediating built, social, and ecological affordances (An-
deries et al. 2016). Flywheels manifest as entities facilitated by the simplified interactions
(e.g. organizations) and as cycles maintaining the infrastructures (e.g. supply chains). They
manifest internal specialization as well as distributed intention, and so can favor certain
groups’ interests, and reinforce cultural blind spots to social exclusion (Mills 2007).
The perspective is applied to research of resilience in SESs, considering flywheels a
semiotic extension of feedback control. Closer attention to representations of potentially
excluded groups is justified on epistemic in addition to ethical grounds, as patterns in cul-
tural text and social relations reflect the functioning of wider social processes. Participatory
methods are suggested to aid in building capacity for institutional learning. / Dissertation/Thesis / Doctoral Dissertation Anthropology 2017
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