• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1222
  • 1079
  • 3
  • 3
  • 1
  • 1
  • Tagged with
  • 2307
  • 2307
  • 2307
  • 2307
  • 2307
  • 2274
  • 2268
  • 468
  • 305
  • 299
  • 277
  • 221
  • 221
  • 173
  • 170
  • 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.
41

Description and analysis of Institutions for Communal Forest Management in Monte Verde, Bolivia.

Salazar, Remberto January 2010 (has links)
This study contributes to the Common Pool Resources debate by describing and analysinginstitutions that currently structure governance of community-based forest management inSanta Mónica and Palestina, within the Monte Verde region, Bolivia. It explores theinterplay between innovative communal and central-authority institutional features, theway they work and how they enable forest conservation. The method is narratology andanalysis of institutions and documents produced by this governance system through thelens of Elinor Ostrom’s institutional framework for the ‘alternative solution’ to thecommons problem. The results reveal that local communal rules and central-authorityrules are complementary rather than competitive. The local communities and the centralauthorityshare power to devise and enforce institutions for communal forestmanagement, which enable the local communities to exclude external actors, known as‘timber pirates’, who illegally harvest timber in this region. The central-authorityestablishes guidelines that are sensitive to local cultural contexts. Local governancedevelops rules conforming to these guidelines. The main reasons behind successful forestconservation in Monte Verde lie on the fact that a healthy forest is in the interest of localcommunities due to its contribution to economic development. Ecosystem services suchas traditional forest produce, profits from timber sales and related employment are vitalcontributors to the local economy. Governmental institutions and internationalconservation principles support this local interest and, therefore, this collaborative relationis successful. This case study also explores an innovative approach for dealing with theproblem of free-riding. Collective appropriation of timber products by local communitiesprevents internal individual appropriation race and enables them to make a more effectivemonitoring over unauthorised forest users.
42

Path dependency of infrastructure : Implications for the sanitation system of Phnom Penh, Cambodia

Meacham, Megan January 2009 (has links)
Phnom Penh’s sanitation system is a combination of the drainage system and sewage system.Storm water, household wastewater, and industrial wastewater all flow together out of the city tothe detriment of the natural environment and the humans that depend on it. This continuedpersistence of an inefficient and harmful system is explored using path dependency theory. Pathdependency constrains the system to linear development and reflects the historical context inwhich decisions were made. Phnom Penh’s sanitation system is used to exemplify components ofpath dependence and their effect on implementing change.To incorporate room for change into Phnom Penh’s sanitation system, the inherent longevity inbuilt infrastructure must be overcome. Building infrastructure is expensive and the learning andcoordination that is associated with it is not easily replaced. The social context is ultimatelyresponsible for the investments made and the type of system expressed. Phnom Penh’s sanitationsystem reflects a historical legacy of colonial rule, decades of war, political chaos, and an influxof international aid contributing to an inefficient system being developed. The presence ofunpredictability and inflexibility in the system can result in an inefficient system being sustained.
43

Illegal Chinese Fishing in West African Waters : A study on Chinese IUU Activities and its Consequences to Socio-Ecological Systems

Dobo, Avital January 2009 (has links)
West African fisheries, considered as one of the most productive in the world, have been subjected to stress by distant fishing fleets since the 1950’s. The introduction of Exclusive Economic Zones by the United Nations in the 1970’s made it possible for these fleets to fish only under fishing agreements signed with a hosting land, provided that they will harvest the surplus left by the local fishing fleet. In the last two decades, China has emerged as an important fishing nation in West Africa. Although there is clear evidence that Chinese vessels operate in the area, information on Chinese fishing agreements with West African countries is often missing. The implications on local fisheries are considerable. Lack of data regarding fish landings in the region may result in an increase of unsustainable fishing. The results of this study show considerable involvement of Chinese fishing vessels in illegal fishing in West Africa. In addition to the substantial loss of revenues to local nations, the negative impacts of illegal fishing on the marine ecosystem are likely to affect human populations that rely on these ecosystems. As the vulnerability of these people, many of them living in poor rural communities, is already high, unsustainable fisheries and a potential shift in the state of the marine ecosystem is likely to worsen their situation even more. Most West African countries lack capital resources to invest in monitoring, control and surveillance authorities, making illegal fishing relatively effortless. A better capacity to deter this type of activities is likely to have a significant improvement on West African fisheries. In addition, Chinese authorities, committed to the United Nations Law of the Sea, have the responsibility to take action against Chinese vessels that perform illegal activities in other parts of the world. A decrease in Chinese illegal fishing activities in West Africa, assessed to be considerable based on the studies’ results, will improve the possibility for achieving sustainable fisheries in the region.
44

The non-linear relationship between grazing function and size of two parrotfish species in the Red Sea : Implications for coral reef resilience

Brand, Annelie January 2009 (has links)
Abstract. Parrotfish, a herbivorous reef fish, is considered to play an important role within coral reef ecosystems, enhancing coral reef resilience by keeping algal growth in check, allowing slower-growing coral recruits to settle. The functional performance of parrotfish species has been indicated to be dependent on body size. Albeit increasing size selective fishing pressure maintains, leading to immense effects on the dynamics of coral reefs, with consequences often much larger than changes in biomass and abundance of the targeted stock itself. The relative importance of the relationship between function (grazing) and body-size was tested in two parrotfish species (Scarus niger and Chlorurus sordidus) in the Red Sea. A non-linear relationship was found between functional performance and body size, with function found to increase notably as fishes reach a size of 15-20 cm At a regional level, parrotfish function was found to be low. These findings support the idea of a generalized ecological pattern of functional performance in parrotfishes. Demographic skewness within parrotfish species populations could easily be incorporated in routine monitoring schemes, thus act as a comparatively cheap and easily monitored indicator for assessing coral reef resilience, especially useful for managers in areas of limited budgets. Other alternative stable states than macroalgae, are speculated to be the case in the Red Sea.
45

THE ROLE OF A GLOBAL ORGANIZATION IN TRIGGERING SOCIAL LEARNING : Insights from a Case Study of a World Heritage Cultural Landscape Nomination in Bali

Schmuki, Anna January 2009 (has links)
Cultural landscapes provide goods and services that humans depend on. Managingsuch landscapes requires an institutional context that is safeguarding its functions.Collaboration among various stakeholders, organizations and authorities for establishingecosystem- based management is considered to be a major challenge and often transformationin governance is required. While governance that is integrating agencies across multiplespatial and institutional levels is increasingly suggested in trans-disciplinary research onsocial-ecological systems, processes on how to achieve this are poorly understood.Social learning is acknowledged for enhancing collaboration among multiplestakeholders, to increase actors’ capacity to deal effectively with the plurality of perceptions,to take collective decisions and to learn from experience. This case study is arguing that aninternational organization can trigger social learning. Emphasizing the role of guidance, thesense of prestige and creation of a common platform, specifically, it is exploring learningconditions, procedures and outcomes within a stakeholder group that is carrying out theWorld Heritage nomination of a cultural landscape in Bali. It exemplifies the challenge formanagement of a social-ecological system, in which no longer only the local resource usersand authorities have interest concerning the cultural landscape they are living in, but alsoglobal agencies are influencing management and hence the ecosystem itself.In that sense, the study is supporting the need of multi-scale governance dealing withglobal changes in natural resource management. It provides an example of a global actorsupporting self- organized learning processes. Though a structural social learning analysis, theunderstanding for this concept is deepened. Results reveal the potential and limits of aninternational organization in triggering sense making for a common vision, integratingstakeholders across vertical and horizontal scales and changing institutional frameworks thatenhance further learning and collaboration.
46

Impacts of Agriculturally-driven Regime Shifts on Ecosystem Services and Human Well-being

Hammond, Christine January 2012 (has links)
Regime shifts are large, abrupt, persistent changes in the structure and function of ecosystems that may have substantial consequences for human well-being. In agricultural ecosystems, examples of regime shifts include soil salinization, lake eutrophication and bush encroachment. Here, a novel, adaptable scoring system was developed using ecosystem services and human well-being as framed by the Millennium Ecosystem Assessment to: 1) quantify the impact of twelve agriculturally-driven regime shifts on ecosystem services and human well-being; and 2) estimate the effect that agriculturally-driven regime shifts have on different user groups. Key results include: 1) Ecosystem services and human well-being indices are impacted negatively by nearly all shifts from less to more anthropogenically impacted regimes; 2) The relative difference in ecosystem service amount between alternate regimes is much larger for regime shifts with more negative impacts than those with positive impacts; and 3) All user groups were impacted negatively by nearly all regime shifts, with industrial farmers being impacted least negatively and subsistence farmers being impacted most negatively. These findings can facilitate a better-informed assessment of the potential risks, benefits and costs associated with taking action to avert or precipitate agriculturally-driven regime shifts.
47

An analysis of the potential of local stewardship as a management mode for increasing and enhancing ecosystem services in the urban landscape : Three case studies in Stockholm Municipality – Igelbäcken Allotment Garden, Akalla Allotment Garden and the Vinterviken Garden

Oddsberg, Josefina January 2011 (has links)
The capacity of urban areas for generating quality of life is largely dependent on theecological processes and the green spaces of the cityscape. The ecosystem services supportedand generated by urban green spaces are fundamental to human well being in cities.Hence, this master thesis explores the possibilities of local stewardship as a possiblemanagement mode for enhancing ecosystem services in the urban landscape. It does so by ananalysis of management rights to state-owned lands in the municipality of Stockholm andthrough evaluating to what extent the institutional structure of the management enables localstewardship. Further, by choosing three case studies comprised of Igelbäcken AllotmentGarden, Akalla Allotment garden and the Vinterviken garden, all three located on state-ownedland in Stockholm Municipality, this thesis explores how the rules in use are fashioned andfollowed and what role leadership plays in this process. Finally, the motivational drivers forgetting involved in local stewardship in all three case studies were explored.The study is of a qualitative nature primarily utilising semi-structured interviews withgardeners at the case studies, employees at the municipality and direct observation as a meansto gather data. The key findings of this study suggest that the possibilities of local stewardshipof green areas owned by Stockholm municipality are limited. The resources for the municipaldistricts’ administering of local stewardship initiatives are insufficient and the institutionalstructure is complicated and unclear.The rules in use in the respective case studies are dependent on the leadership in the gardensand this thesis suggests that a mix of planning-led and visionary-led leadership could beemployed in order to maintain a resilient institutional structure. The motivational drivers forthe engagement in the case study areas differ but are dominated by practices within cultural,recreational and provisioning ecosystem services. Hence, the local stewardship examined inthe three case studies indicates that the green-area management is not based on biodiversityconservation but is primarily oriented towards nurturing cultural and provisional ecosystemservices. However, these practices contribute to enhancing additional ecosystem services.The results of this study have indicated the importance of exploring the interplay betweeninstitutions, leadership and motivational drivers in order to design more efficient urbanmanagement designs that involve local stewardship groups.
48

Of Tree Planting, Salvation and Urbanization : The Role of Evangelical Movements in Adaptive Capacity. Kigali, Rwanda.

Sundqvist, Johan January 2011 (has links)
Evangelical churches are growing rapidly in Sub-Sahara Africa, in sheer numbers as well asin societal importance. At the same time urbanization and its associated negativeenvironmental and social consequences are putting pressure on many urban social-ecologicalsystems in the global south. The question that this paper raises is how the growing religioussocial movements frame these change processes and their role in them? With its rapidurbanization and high church involvement in civil society Kigali, Rwanda serves as the casestudyThe study, conducted through semi-structured interviews with church leaders from fivechurches in Kigali conveyed that the evangelical religious movements offer a world viewsalient with many of its' supporters belief systems and experiences of everyday life. There isno doubt of the potential for mobilizing collective action, inherent in the evangelical churchesin Kigali. While currently lacking a clear and coherent agenda on its role in the adaptivecapacity of the social-ecological system of Kigali, an awareness is awakening. Yet manyactions, such as tree planting, infra-structure improvements and education, are taken toimprove the biophysical environment. These are based in the movement supporters' holisticworldview, where physical and spiritual health goes hand in hand. With increasedunderstanding within the movements, of complex social-ecological relations possibly throughthe ambitious projects set up by some of the churches involved, this study shows themovements potential of becoming important actors on environmental issues. This study addsto the growing body of work challenging the assumption that a focus on key individuals issufficient to explain the human processes within a social-ecological system. The empiricalfindings serve as good examples of how the intangible processes occurring inside individualsin a system have the potential of inducing far reaching consequences for that system, whenamplified through a social movement. Further research, emphasizing on participatoryobservations could increase this papers contribution to theory development on adaptivecapacity.
49

Strategies for pollination services as a productive input in Canola production

Granath, Fredrik January 2011 (has links)
The threats to ecosystems and the future delivery of ecosystem services are to a large extentassociated with risks and uncertainty. Integrating these concepts into the analysis on ecosystemservices is thus an important aspect when building sound theoretical frameworks as well aspractical guidelines.We use a standard framework from financial economics that incorporates risk to analyse howfarmers may opt for different strategies for how pollination may affect their harvest. Undercertain assumptions, this framework highlights the inherit trade-offs in the output and risk ofpollination, as well as showing that farmers may opt for different strategies depending on theirrisk preference.Our conclusion from this study is that, although proper data on pollination is lacking, theframework used in combining risk management and ecosystem services does highlight crucialaspects of ecosystem management and may be used as an argument for using precautionary-typemanagement.
50

Carbon, Energy and Water Footprint of threeAkzoNobel Internal Sizing Chemicals : A Cradle to Gate LCA related study

Triantou, Adamantia-Dimitra January 2009 (has links)
Functional chemicals are used in paper production to enhance specific characteristics in the final paper product. One functional chemicals category is internal sizing chemicals which are used to create liquid resistance hydrophobicity in the paper, at the wet end of the production process. This thesis report calculated the environmental burdens of three internal sizing chemicals produced by Eka Chemicals, a business unit of AkzoNobel. The three chemicals under study are a specific product of each of the following categories: Alkyl Ketene Dimer (AKD), Alkenyl Succinic Anhydride (ASA) and Cationic Dispersion Rosin. A Life Cycle Assessment (LCA) was performed from cradle to end customer gate. The Carbon, Energy and Water Footprint of the three products were calculated using Gabi 4 software. The functional unit used in LCA was the kilograms of dry sizing chemical required for the production of 1kg of paper. Two paper grades were used; copy paper, where AKD and ASA are mostly applied and solid board, where ASA and Rosin are applied. The Carbon Footprint for copy paper and a distribution distance 1500 km was found to be 2,5 kg CO2 eqv/ton paper for AKD, 5,1 kg CO2 eqv/ton paper for ASA and 4,9 kg CO2 eqv/ton paper for Rosin. The Energy Footprint results for the same case were 62 MJ/ton paper consumed by AKD, 136 MJ/ton paper by ASA and 228 MJ/ton paper by Rosin. The Water Footprint results for copy paper and 1500 km distribution distance were 0,1 m3 water/ton paper consumed by AKD, 0,3 m3 water/ton paper by ASA and 0,5 m3/ton paper by Rosin. Dominance analysis diagrams illustrated that for all three sizing chemicals raw material production is a hotspot both for the Carbon Footprint and the Energy Footprint. Data was evaluated and a sensitivity analysis was performed on assumptions, allocation percentages and scenarios (including and not including the emulsification of ASA). The results conclude that AKD is the best alternative according to the Carbon, Energy and Water Footprint calculated for all applications. For solid board the best choice for large distribution distances appears to be ASA. / www.ima.kth.se

Page generated in 0.0908 seconds