Metal-contamination of lakes simplifies food webs and reduces the efficiency of energy transfer to top trophic organisms, such as yellow perch (Perca flavescens). Benthic invertebrate community composition and yellow perch diet, growth and activity levels from lakes along a metal-contamination gradient were used to assess the importance of a naturally diverse prey base for maintaining energy transfer to growing fish, and how this is disrupted by metal-contamination. As perch grow larger, they shift their diet to larger prey; otherwise, the activity costs of foraging for many, small prey, instead of a few large prey, become too high and the fish stop growing. Metal contaminated lakes have less diverse zoobenthic communities, particularly the lack of large bodied invertebrate taxa, forcing perch to rely on smaller benthic prey. Perch from metal-contaminated lakes display slow growth and poor condition during benthivory. Estimates of fish activity, using the activity of the glycolytic enzyme Lactate dehydrogenase in perch white muscle tissue as a proxy, suggest that diet shifts to larger prey lower activity costs and may explain how diet shifts maintain growth efficiency as perch grow larger. Perch from metal-contaminated lakes cannot benefit from the energetic advantages of switching to larger prey and thus exhibit poor growth.

Sound is used as a medium for communication by taxa as varied as insects, fish, amphibians, birds and mammals. In some birds like the suboscines, song is genetically encoded, whereas in parrots, hummingbirds and oscines, it is learnt. The diversity and plasticity of birdsong continues to generate interest amongst ornithologists, and many questions remain unresolved. For instance, why do some species sing hundreds of different songs while others use simple, stereotyped ones for the same purposes? Why do some birds learn not only their own species’ song, but also the songs of heterospecifics? There are several anecdotal reports of such vocal mimicry in wild birds, where a species imitates the song or call of heterospecifics in its natural habitat, but much has yet to be learnt about this intriguing phenomenon. There has been a recent surge of interest and research into avian vocal mimicry. Despite having several species of birds that are known to produce mimicry, there is a dearth of research on this field in India. The Greater Racket-tailed drongo’s loud song and ability to mimic other species of birds with great accuracy has drawn the attention of many birdwatchers, but other than a few phonetic descriptions, no study has focussed on their song. Therefore, this thesis focuses on the structure, contexts and functions of vocal mimicry in this species. In order to understand the functions of vocal mimicry in any species, we require certain fundamental data, which are often overlooked in many studies of bird song. Since this is the first study focusing on the racket-tailed drongo in India, I began with collecting natural history data on the ecology and breeding biology of the species. Then, I attempted to arrive at an objective and quantitative definition and classification of the racket-tailed drongo’s vocal repertoire, especially its mimicry. It is also essential to have information on the contexts in which this mimicry is used. Using a combination of focal animal sampling and sound recordings, I documented the contexts in which the racket-tailed drongo imitates other species in the wild. I also examined the diversity of the species that were mimicked across these contexts. Building on the data from these observations, I used playback experiments to test hypotheses for the functions of mimicry in multiple contexts. Results from these show that greater racket-tailed drongos use mimicry in a flexible manner according to the intended audience. Drongos use two different sets of mimicked calls with distinct syntax directed at conspecifics and heterospecifics respectively, the former in territorial song and the latter to attract members of mixed-species flocks. These results also imply that mimicry may be driven by both sexual and natural selection within the same species, and have implications for the definition of avian vocal mimicry, which remains highly debated.

No description available.

This study explored the effects of the Skills Development Act 97 of 1998 on transforming municipal management training and development. The pre-1994 education and training was premised on the policy of separate development. This policy prevented the majority of the people, mainly blacks, from receiving adequate training and development. Resultantly, training and development in South Africa have assumed significance since the adoption of a constitutional democracy, especially at the local government sphere which constitutes the coalface of service delivery. Investment in human resources training and development at management level is imperative for institutions to gain strategic and operational advantage.Analysis and interpretation of data in this study were undertaken through official document analysis, interviews and structured questionnaires. The major findings of the study indicate that according to the first objective the majority of respondents are qualified as they possess higher education qualifications due to the assistance of the municipality, with nearly half currently involved in furthering their studies. As far as the second objective is concerned, the researcher found out that the majority disagree with the statement that opportunities are created to motivate employees to use the workplace as an active learning environment to acquire new skills. Further analysis and interpretation of data show that according to the third objective the majority of respondents do not undertake crucial management courses relevant to the workplace. Final data analysis and interpretation of the fourth objective reveal that the majority of respondents are not aware of the support and financial investment in education, training and development of municipal officials, due to aspects such as lack of consultation and transparency. / Public Administration / M.Tech. (Public Management)

Destined companions of the calling (compañeros del destino), huapango arribeño music practitioners often refer to each other as – a label that signifies the expressive bonding forged through the axis of encounter/engagement central to huapango arribeño’s performance. As of late, huapango arribeño, which originates in Mexico, has made its way across the border where it is performed among communities of listeners and practitioners in the U.S. This dissertation unearths the cultural dimensions of the experiences of migration particular to the immigrant communities in question with focused attention on the performative (musical/discursive) contouring of the transborder imaginary – the prism through which they live and understand their lives, make decisions, work, perform, and imagine. Attention is given to the physical and metaphysical construction of the border between the U.S. and Mexico, to its militarization and officialized discourses of the nation and citizenship that legitimate draconian policy initiatives. Huapango arribeño – as a site of conviviality and sociality –, it is argued, actively disrupts this dislocational alchemy of the borderlands, as communities themselves cultivate the linkages that shape the patterning of their multidirectional existence across borders. / text

This paper investigates the cost-tradeoffs of implementing a test data compression technique previously presented in [Lee 06] which uses a small non-linear decoder combined with a linear decompressor to achieve greater test data compressions. The non-linear decoder is a sequential non-linear decompressor that exploits bit-wise and pattern-wise correlations in test vectors. This paper further emphasizes the design and implementation side of the proposed test data compressor. The linear decompressor used in this design is a Linear Feedback Shift Register (LFSR) which after choosing the right seed has the ability to produce the correct care bit values while filling the don’t care value bits with pseudo-random values. Experimental results show that using the presented compression scheme here significantly improves the overall compression. Area and power results are presented for the experiments carried out on the given design. / text

Doctor of Philosophy / Department of Geography / Lisa M.B. Harrington / The Greater Yellowstone Ecosystem (GYE) is a large, nearly intact ecosystem with significant protection that has often been considered an ideal location to examine coupled human-environment interactions due to the region’s complex mosaic of private and public lands, competing natural resource uses, and rapid population growth. A transition toward sustainability suggests that current societal and economic needs can be met while simultaneously maintaining the planet’s life support systems for future generations. To facilitate sustainability transitions it is imperative that the perceptions and experiences of local communities be documented. The objective of this study was to determine how residents of amenity-driven gateway communities (West Yellowstone and Red Lodge, Montana, and Jackson, Wyoming) surrounding Yellowstone and Grand Teton national parks perceive and experience their transition toward sustainability and the challenges inherent in that transition, how those perceptions inform locally produced and extra-local policies, and how institutions influence sustainability goals. Further, this study determined which factors contribute to these perceptions, and whether they differed spatially and temporally. To meet study objectives, a mixed methods approach was implemented, including the content analysis of local newspapers and key informant interviews. Content analysis of local newspapers was used to investigate decision maker and stakeholder priorities for the local and regional environment, economy, and communities, and to determine what actions had been taken to promote sustainability. A total of 193 articles from West Yellowstone News, 287 articles from Carbon County News, and 333 articles from Jackson Hole News & Guide for the ten year period 2000-2009, were analyzed. Specific focal topics varied among the newspapers/communities, but in general terms the most discussed topics in West Yellowstone during this time were focused on natural resources, economic development, community development, sustainability and conservation, and growth and development. The most discussed topics for Red Lodge were community development, government services, tourism and recreation, and growth and development. The most commonly discussed topics in Jackson were natural resources, growth and development, community development, and government services. A total of 35 semi-structured interviews were conducted with key informants in the three study communities during the summer of 2010 to allow for specific questioning and to gain additional information. Definitions of sustainability differed based on the key informant’s community, role in the community, and length of residence in the community. Overall, definitions of sustainability focused on the environment, the economy, and multi-generational or long-term thinking. The prioritization of the economy, environment, and society also differed based on community; however, there was overall recognition that each community was dependent upon the natural environment for economic vitality. In all three study communities, dependence on tourism and recreation-based industries, the lack of a diversified economy, and continued growth and development have resulted in a disconnect between perceptions, priorities, and goals as they relate to sustainability. In addition, each community was focused on multiple goals that further complicated the fulfillment of sustainability objectives. The multi-goal orientation of study communities is reflected in the multiple visions that various decision makers and stakeholders have for the community and their futures. What is needed most is a hierarchical approach to a sustainability transition, with each community setting its own, as well as ecosystem-wide, goals, objectives, and visions. Findings suggest that a transition toward sustainability is perceived and experienced differently based on local context. In the GYE, that context includes a tourism-based economy that is dependent upon the natural environment, a myriad of local, regional, national, and global stakeholders, and the presence of federal land agencies that are responsible for the sustainability of natural systems, freeing local communities to focus on the societal and economic dimensions of sustainability. A transition toward sustainability will be manifested differently in the Greater Yellowstone Ecosystem, and potentially other communities adjacent to protected lands, than it is other areas because of its unique milieu. While the close proximity of federal lands, including Yellowstone National Park, may complicate the sustainability discourse at times and may, in certain instances, add additional challenges through extra-local control of change, these same federal lands may also favor a transition toward sustainability in amenity-driven gateway communities. In addition, the disparate socio-economic conditions present in study communities, as well as extra-local institutions and agencies, directly influence, and may at times further complicate, a transition toward sustainability. This study is based on the theory that in order to successfully transition toward sustainability, a better understanding of coupled human and natural systems is critical, and because of the close couplings between human and natural systems in the Greater Yellowstone Ecosystem, and because of the unique challenges and conflicts present in the region, the GYE is an ideal location to study human-environment interactions. The use-inspired orientation of sustainability science aims to provide tangible, real-world, and place-based understanding of a transition toward sustainability. The contribution of this study to the field of sustainability science is the understanding that, while sustainability visions, goals, and objectives may be similar across a region, consideration of local contexts affecting goals and perceptions provides valuable insights that may inform sustainability pathways at local scales and, as a result, provide deeper understanding of global sustainability. One of these insights is that communities that seemingly have much in common due to their shared region, physical environmental surroundings, and history, the specific concerns to ensure place-based sustainability can show variability. Another important point from this research is that, while most depictions of sustainability are focused on three elements—the economy, society, and the environment—individuals also key in on multigenerational concerns.

Faculty of Humanities School of Social Sciences 0413346n Wanguimaina@hotmail.com / This research report is a study of US foreign policy towards Kenya. The context of the study is informed by the role that the US played in Kenya’s democratisation process in the post-Cold War era, the 1998 US embassy attacks in Kenya, and US policy following the events of 11 September 2001. The study sets out to examine how these events subsequently affected the domestic policies of Kenya. It identifies the continuities and new avenues of the bilateral relations between Kenya and the US. Democracy, terrorism and US foreign policy are the underlying factors of the study.

This study explored the effects of the Skills Development Act 97 of 1998 on transforming municipal management training and development. The pre-1994 education and training was premised on the policy of separate development. This policy prevented the majority of the people, mainly blacks, from receiving adequate training and development. Resultantly, training and development in South Africa have assumed significance since the adoption of a constitutional democracy, especially at the local government sphere which constitutes the coalface of service delivery. Investment in human resources training and development at management level is imperative for institutions to gain strategic and operational advantage.Analysis and interpretation of data in this study were undertaken through official document analysis, interviews and structured questionnaires. The major findings of the study indicate that according to the first objective the majority of respondents are qualified as they possess higher education qualifications due to the assistance of the municipality, with nearly half currently involved in furthering their studies. As far as the second objective is concerned, the researcher found out that the majority disagree with the statement that opportunities are created to motivate employees to use the workplace as an active learning environment to acquire new skills. Further analysis and interpretation of data show that according to the third objective the majority of respondents do not undertake crucial management courses relevant to the workplace. Final data analysis and interpretation of the fourth objective reveal that the majority of respondents are not aware of the support and financial investment in education, training and development of municipal officials, due to aspects such as lack of consultation and transparency. / Public Administration and Management / M.Tech. (Public Management)

Thesis (M.S.)--Boston University / This study was undertaken to compare the views of leaders, former members of discussion groups and the agency's view of what is involved in discussion groups carried on by the Family Life Education Department of the Greater Boston Family Service Association. It is felt that by gaining additional insight into how the practitioner, in the case of the leaders, and the consumer, in the case of the former members, see the discussion groups, it is hoped that some of these views obtained may eventually be applied in improving future groups. It is also felt that if the agency's stated purpose of the discussion groups is considered in the comparison of the leaders' views and the former members' views of the groups, this will serve to suggest ways of improving the future groups. Another purpose of this study is that it is believed that it will yield indications as to the value of discussion groups of this type.