This study aimed to investigate the spatial extent of Land-Use Land-Cover (LULC) change and the implications for ecosystem services in order to develop a sustainable land-use management framework for traditional authorities in South Africa. Effectively, this study undertook an insightful examination of the impacts that arise from policy decisions and practices, which unfortunately were found to be ineffective. The methodologies and approaches used in this study included both quantitative and qualitative techniques. The critical quantitative method employed in this research was the use of survey questionnaires to collect primary data. Qualitative approaches, such as one-on-one and key informant interviews, were used to triangulate the findings. Remote sensing and geographic information system (GIS) methods were used to investigate changes in LULC from 1990 to 2018 through the use of data obtained from the South African National Land-Cover project. Stochastic models were used to predict future LULC changes from 2018 to 2050. The Co$ting Nature Policy Support System was used to identify and undertake economic valuation of services provided by ecosystems. Statistical analysis using the Statistical Package for the Social Sciences was used to identify correlations and the reliability of the data, while graphs and tables were generated to identify patterns and lessons from the research. Between 1990 and 2018, significant changes in land cover were noticed for thickets and dense bush, woodlands, waterbodies, subsistence agriculture, and built-up areas. Woodlands changed by over 1 000 hectares (ha) per year, while thickets decreased by over 900 ha per year. Drivers of these changes include deforestation, among others. Future predictions for LULC revealed that between 2018 and 2050, almost 500 ha of woodlands would be lost to built-up areas. The aggregate value of the services flowing from ecosystems was found to be R9 509 044 608.00. A significant issue was that 90% of the traditional leaders interviewed could not positively respond to whether they knew the extent of the land they presided over, which raised questions regarding the effectiveness of their management systems. Recommendations were made in this study to address the limitations identified in the land-use management practices by adapting elements of the main theoretical frameworks, namely the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services framework; the Drivers, Pressures, States, Impacts and Responses framework; the sustainability theory; and the hierarchy of plans, into a new framework designed specifically for traditional leaders, titled the “Traditional leaders land-use decision support framework”. / Environmental Sciences / D. Phil. (Environmental Management)

L’anti-microbio-gouvernance apparaît comme un ensemble de politiques, de standards et d’avis judicieux visant à responsabiliser les pratiques à l’égard des conséquences d’une technologie – l’antibiotique. Si l’antibiotique améliore à court terme l’offre de soins (la cure pharmaceutique), il est aussi à la source de nouveaux risques anthropiques et écologiques à long terme pour la santé, la productivité et la biodiversité, en raison de l’émergence de gènes de résistance réduisant l’efficacité des traitements et faisant pression sur les communautés bactériennes – humaines, urbaines, édaphiques, etc. L’appréciation de ce dilemme (cure / risque), puis la performance de sa gestion, reposent sur la qualité des politiques et du processus d’antimicrobiogouvernance ainsi que des réflexions en amont intégrant les valeurs (éthiques), les savoirs (scientifiques) et l’expérience. La vision globale de Van Rensselaer Potter pour la bioéthique ouvre la perspective vers la philosophie et la pratique d’Aldo Leopold, dont une technique d’aménagement adaptatif des écosystèmes co-construite, par communauté, sur la base d’une bio-éthique globale (techno-socio-écologique) des pratiques et de l’environnement. En effet, comment responsabiliser tout un chacun face à une cure, à un risque et à l’incertitude ? En prenant la perspective de la sociologie des organisations, cette thèse explore une piste étudiée en science, technologie et société : comment concerter l’humain et le non-humain (les technologies et la Nature) par la voie de systèmes (communication, collaboration et éducation) pour anticiper l’émergence de problèmes ? L’objectif de cette thèse est de proposer une approche en éthique pour coconstruire la gouvernance des relations se tissant entre les secteurs et les disciplines bâtis sur les valeurs de la santé, de la productivité et de la biodiversité. À sa racine, ce cadre de gouvernance vise à dynamiser l’arbitrage de l’accès et de la protection des données – et conséquemment le trajet de l’information, des connaissances et des applications technologiques, pratiques et politiques – sans briser la confiance des acteurs impliqués. L’arbitrage des données, à la source de la production des connaissances techniques, est la clé pour orienter les systèmes de communication et de politiques conduisant à des conseils et à des régulations. Cette nouvelle approche en éthique cherche à avancer la vision d’un projet commun sans altérer l’intégrité des actions spécifiques à la médecine, à l’agriculture et à l’écologie. Cette thèse théorise et applique le procédé d’une bioéthique expérimentale combinant les façons de faire empirique, réflexive et multisite. Elle s’inspire de méthodes en anthropologie, en sociologie et en gestion, et de la réflexivité balancée. Quatre unités épistémiques sont articulées in fine selon une logique précise pour éviter un biais cognitif auquel le raisonnement d’une bio-éthique s’expose (le sophisme naturaliste) : le descriptif, une prise de conscience (partie I) ; l’appréciatif, une théorie de travail (partie II) ; le normatif, la préparation du terrain (partie III) ; et l’évaluatif, les outils de bioéthique (partie IV). Ultimement, le produit de l’approche est un cadre de gouvernance coconstruit avec plusieurs collaborateurs dont les initiatives sont susceptibles de provoquer des changements politiques et scientifiques. À titre de bioéthicien, l’intention est d’aider les personnes et les institutions ayant le leadership de projets de société à développer des outils capables d’encapaciter (ang., empowerment) les communautés à gouverner les changements à venir qui les concernent. / Anti-microbial governance can be understood as a set of policies, standards and judicious guidance aimed at making practices more responsible for the consequences of a technology – the antibiotic. While in the short-term antibiotics improve the quality of care (the pharmaceutical cure), they also create new long-term risks to anthropical and environmental health, productivity and biodiversity, due to the emergence of resistance genes that reduce the effectiveness of treatments and put pressure on bacterial communities – human, urban, edaphic, etc. The appreciation of this cure / risk dilemma, and the performance of its management, rely on the quality of the antimicrobial policy and governance processes as well as on upstream reflections integrating (ethical) values, (scientific) knowledge and experience. Van Rensselaer Potter’s global vision for bioethics opens the perspective towards Aldo Leopold’s philosophy and practice, namely an adaptive management technique of ecosystems co-constructed, per community, based on a global (techno-socio-ecological) bio-ethics of practices and the environment. Indeed, how can we make everyone responsible in the face of a cure, risk and uncertainty? By taking the perspective of the sociology of organizations, this thesis explores a path studied in Science, Technology and Society: how to bring together the human and the non-human (technologies and Nature) through (communication, collaboration and education) systems to anticipate the emergence of problems? This thesis will propose an approach in ethics to co-construct the governance of relationships between sectors and disciplines built on the values of health, productivity and biodiversity. At its root, this governance framework aims to energize the arbitration of access to and protection of data – and consequently the paths of information, knowledge and technological, practical and political applications – without breaking the trust of the actors involved. Data arbitration, at the source of technical knowledge production, is the key to guiding communication and policy systems toward guidelines and regulations. This new approach to ethics proposes the vision of a common project without altering the integrity of specific actions in medicine, agriculture and ecology. This thesis theorizes and applies the practice of an experimental bioethics combining empirical, reflexive, and multisite ways of thinking. It draws on methods in anthropology, sociology, and management, and uses the reflexive balancing process. Four epistemic units are articulated in fine according to a precise logic in order to avoid a cognitive bias to which the reasoning of a bioethics is exposed (the naturalistic fallacy): the descriptive, a raising of awareness (part I); the appreciative, a working theory (part II); the normative, the preparation of the terrain (part III); and the evaluative, the tools of bioethics (part IV). Ultimately, the product of this approach is a governance framework co-constructed with several collaborators whose initiatives have the potential to bring about policy and scientific changes. As a bioethicist, the intention is to help individual and institutional leaders of socio-technical projects to develop tools capable of empowering communities to prospectively govern the changes that concern them.

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Human-induced impacts associated with recreational use in wilderness areas have the potential to imperil the wilderness resource and the quality of visitor experiences. One approach to address this problem is the Limits of Acceptable Change System, which helps Protected-area managers determine acceptable levels of resource impacts and social conditions in wilderness areas. This study's objective was to determine the possible applicability of the Limits of Acceptable Change System to the overnight caves in the wilderness areas of the uKhahlamba-Drakensberg Park. Component A of the study discusses the ten steps of the Limits of Acceptable Change system and the management approaches for the wilderness areas and overnight caves in the uKhahlamba-Drakensberg Park. A product of Component A is a procedure manual for inventorying indicators of resource conditions in the overnight caves. During a brief period of field research this procedure manual was applied to four overnight caves in the Mlambonja Wilderness area. Component B of the study summarizes much of the information found in Component A and examines the results from the field research. Recommendations are made to improve the effectiveness of measuring the resource indicators for the overnight caves in the procedure manual. This study's conclusions indicate that the Limits of Acceptable Change System can be applied to the overnight caves and would provide a valid management framework to address visitor impacts / Thesis (M.Env.Dev.)-University of KwaZulu-Natal, Pietermaritzburg, 2004.

Indiana University-Purdue University Indianapolis (IUPUI) / Riparian buffers have well documented capacity to remove nitrate (NO3-) from runoff and subsurface flow paths, but information on field-scale N2O emission from these buffers is lacking. This study monitored N2O fluxes at two agricultural riparian buffers in the White River watershed (Indiana) from December 2009 to May 2011 to assess the impact of landscape and hydrogeomorphologic factors on emission. Soil chemical and biochemical properties were measured and environmental variables (soil temperature and moisture) were monitored in an attempt to identify key drivers of N2O emission. The study sites included a mature riparian forest (WR) and a riparian grass buffer (LWD); adjacent corn fields were also monitored for land-use comparison. With the exception of net N mineralization, most soil properties (particle size, bulk density, pH, denitrification potential, organic carbon, C:N) showed little correlation with N2O emission. Analysis of variance (ANOVA) identified season, land-use (riparian buffer vs. crop field), and site geomorphology as major drivers of N2O emission. At both study sites, N2O emission showed strong seasonal variability; the largest emission peaks in the riparian buffers (up to 1,300 % increase) and crop fields (up to 3,500 % increase) occurred in late spring/early summer as a result of flooding, elevated soil moisture and N-fertilization. Nitrous oxide emission was found to be significantly higher in crop fields than in riparian buffers at both LWD (mean: 1.72 and 0.18 mg N2O-N m-2 d-1) and WR (mean: 0.72 and 1.26 mg N2O-N m-2 d-1, respectively). Significant difference (p=0.02) in N2O emission between the riparian buffers was detected, and this effect was attributed to site geomorphology and the greater potential for flooding at the WR site (no flooding occurred at LWD). More than previously expected, the study results demonstrate that N2O emission in riparian buffers is largely driven by landscape geomorphology and land-stream connection (flood potential).