The emergence of the zoonotic disease, bovine spongiform encephalopathy (BSE) in Canada resulted in a severe agricultural crisis. However, little is known about the ways in which farmers and rural communities were affected. The overall objective of this study is to characterize and better understand the impacts on and responses of farmers and rural communities as they relate to this crisis. Research was undertaken in strata throughout the diverse three Canadian prairie provinces – Alberta, Saskatchewan and Alberta – by employing surveys and focus groups. Results indicated there were numerous direct and ‘spillover’ impacts on farmers and rural communities resulting from the BSE crisis. Declines in cattle prices, herd equity and cash flow, often resulting in the need for bank loans, farm credit or off farm employment, as well as emotional and psychological stress were all experienced by farmers as a result of BSE. Importantly, many additional factors such as adverse weather and market volatility compounded the impacts related to BSE, adding to what was already a crisis situation for many farmers. These impacts were not restricted to farms but, rather, extended into the surrounding community fabric in the form of financial and social stress. Results further indicated government policies contributed to the impacts and the effectiveness of farmer responses related to BSE. A longer-term policy shift that has embraced agro-industrialization and entrenchment into the global marketplace has resulted in clear disparities between the biggest and smallest players in the beef industry and agriculture as a whole. This was illustrated in the ways in which governments responded to the BSE crisis, favouring the needs of the largest farmers and agri-businesses over those of smaller-scale, cow-calf producers. This policy shift and response has left the Canadian beef industry, family farmers and rural communities more susceptible to the emergence of similar future risks. A more inclusive approach to risk research and policymaking that meaningfully involved farmers and their rich, longer-term local knowledge might help mitigate similar risks that will inevitably confront agriculture in the future. / February 2009

Communities of practice are groups of people who share a concern, a set of problems or a passion about a topic, and who deepen their knowledge and expertise in this area by interacting on an ongoing basis (Wenger et al, 2002). An understanding of why working, technical professionals participate in knowledge- based communities of practice can provide better opportunities to support individual and organizational knowledge management strategies. Online communities of practice were investigated at two global corporations: Xerox and IBM. At Xerox, Eureka is an internal network service designed to support knowledge sharing and problem solving by a community of practice for field service technicians. It allows the submission of problems from field service technicians and the retrieval of validated solutions for use and adaptation, by all members of the global Eureka community. At IBM Corporation, public network based communities of practice were investigated that focused on db2™ and Websphere™ software technology. Unlike the Xerox Eureka community of practice, knowledge contributions at IBM communities of practice are not validated prior to submission and access is open to public participation globally by IBM employees and by independent users of IBM software technology. The purpose of this case study research was to explore and to describe how and why participants became members of communities of practice – what influenced them to join and to participate. We collected survey data from participants in these communities, to examine the relationships among members’ expectations of purpose, their relationship to the community of practice, their attitudes toward information handling, the costs and benefits of membership, the size of the community of practice and the resulting participation behaviour in these knowledge-based communities of practice at Xerox Corporation and IBM Corporation. As one aspect of exploring user behaviour, we investigated the applicability of two theoretical frameworks for understanding user behaviour in these communities, based on propositions from normative and utility theory and from public goods critical mass theory. The research study provides a test for the explanatory power of public goods, utility and normative theories in a new area; namely, online knowledge-based communities of practice in workplace contexts. This analysis provided support for the applicability of utility theory and for some aspects of public goods-based theory/critical mass theory. The findings of the case study point out some differences in the two communities of practice. A majority of the IBM-based community members reported belonging to multiple communities (6-10) and using access to the community to form online social networks and to meet members outside the community at in-person meetings. They reported their participation as being self-directed and on an ad hoc basis. Most respondents were community members for less than 2 years. In contrast, a majority of Eureka members reported belonging only to the Eureka community and do not report forming online social networks in Eureka. Participation in Eureka is seamlessly integrated into prescribed, standard work practices of the company and supported by company management and with resources. Most respondents were community members for over 5 years. The analysis of members’ contributing behaviour in two online communities of practice reaffirms that the majority of members are passive participants with a core group of regular message contributors. Message composition is a careful and deliberate activity requiring communication discipline, time and effort. Members in both settings reported a strong desire to spend more time in their communities (and more time per visit). Communities of practice are dynamic complex entities that present not only a theoretical challenge but also a practical challenge. This study’s results point to the complexity of facilitating communities of practice: benefits dynamics and flow and permanence dynamics of membership can only be externally managed to a limited extent. The participants’ roles need to be conceptualized in ways that support different types of participation while at the same time highlighting the inherently cooperative nature of self-managed communities of practice.

Many of Europe’s day-living butterflies have shown decreasing populations during the last decades and many species are threatened. Many butterflies are dependent on managed semi-natural grasslands because of their richness in nectar sources and host plants for the butterfly larva. Swedish pastures are mostly managed through grazing. The number of cattle in Sweden have been decreasing while the number of sheep in the country increased by 30%. I examined if there was any differences in the butterfly and herb species diversity between pastures grazed by cattle or sheep. During the fieldwork, ten structurally similar pastures in the vicinity of Linköping, Östergötland were studied. Grazing by cattle was favourable both for butterfly and herb species with respect to species richness. Larger amounts of grass biomass and ground coverage by grass were in this study linked to sheep grazing. There have earlier been proposed that sheep graze more selective on herbs in favour of grass, with decreasing amounts of herbs and increasing amounts of grass in sheep grazed pastures, as a result. This theory is confirmed in this paper. The hypothesis that lower amounts of herbs give lower supply of larval host plants, which result in declining populations of day-living butterflies was strengthened by this study.

Communities of practice are groups of people who share a concern, a set of problems or a passion about a topic, and who deepen their knowledge and expertise in this area by interacting on an ongoing basis (Wenger et al, 2002). An understanding of why working, technical professionals participate in knowledge- based communities of practice can provide better opportunities to support individual and organizational knowledge management strategies. Online communities of practice were investigated at two global corporations: Xerox and IBM. At Xerox, Eureka is an internal network service designed to support knowledge sharing and problem solving by a community of practice for field service technicians. It allows the submission of problems from field service technicians and the retrieval of validated solutions for use and adaptation, by all members of the global Eureka community. At IBM Corporation, public network based communities of practice were investigated that focused on db2™ and Websphere™ software technology. Unlike the Xerox Eureka community of practice, knowledge contributions at IBM communities of practice are not validated prior to submission and access is open to public participation globally by IBM employees and by independent users of IBM software technology. The purpose of this case study research was to explore and to describe how and why participants became members of communities of practice – what influenced them to join and to participate. We collected survey data from participants in these communities, to examine the relationships among members’ expectations of purpose, their relationship to the community of practice, their attitudes toward information handling, the costs and benefits of membership, the size of the community of practice and the resulting participation behaviour in these knowledge-based communities of practice at Xerox Corporation and IBM Corporation. As one aspect of exploring user behaviour, we investigated the applicability of two theoretical frameworks for understanding user behaviour in these communities, based on propositions from normative and utility theory and from public goods critical mass theory. The research study provides a test for the explanatory power of public goods, utility and normative theories in a new area; namely, online knowledge-based communities of practice in workplace contexts. This analysis provided support for the applicability of utility theory and for some aspects of public goods-based theory/critical mass theory. The findings of the case study point out some differences in the two communities of practice. A majority of the IBM-based community members reported belonging to multiple communities (6-10) and using access to the community to form online social networks and to meet members outside the community at in-person meetings. They reported their participation as being self-directed and on an ad hoc basis. Most respondents were community members for less than 2 years. In contrast, a majority of Eureka members reported belonging only to the Eureka community and do not report forming online social networks in Eureka. Participation in Eureka is seamlessly integrated into prescribed, standard work practices of the company and supported by company management and with resources. Most respondents were community members for over 5 years. The analysis of members’ contributing behaviour in two online communities of practice reaffirms that the majority of members are passive participants with a core group of regular message contributors. Message composition is a careful and deliberate activity requiring communication discipline, time and effort. Members in both settings reported a strong desire to spend more time in their communities (and more time per visit). Communities of practice are dynamic complex entities that present not only a theoretical challenge but also a practical challenge. This study’s results point to the complexity of facilitating communities of practice: benefits dynamics and flow and permanence dynamics of membership can only be externally managed to a limited extent. The participants’ roles need to be conceptualized in ways that support different types of participation while at the same time highlighting the inherently cooperative nature of self-managed communities of practice.

The gastrointestinal tract is colonized by an abundant and diverse community of microorganisms which has a profound impact on the health of the host. The profiling of these microbial communities with traditional culture-based methods identifies only a fraction of microbes present with limited specificity, high labour costs and limited sample throughput. To overcome these limitations, a molecular hybridization assay was developed and characterized using the target gene chaperonin 60 (cpn60). The interspecies discriminatory ability of the hybridization assay was determined by hybridizing cpn60 gene fragments from a known species to a series of cpn60 gene fragments derived from related species with distinct but similar cpn60 sequences. Species with less than 85% cpn60 sequence identity to the probe DNA were effectively distinguished using the hybridization approach. To characterize complex microbial communities, universal PCR primers were used to amplify a fragment of 549-567 nucleotides from cpn60 (the cpn60 universal target (UT)) using template DNA extracted from the ileal contents of pigs fed diets based on corn (C), barley (B), or wheat (W), or from plasmids containing the cpn60 UT selected from a clone library generated from these contents. The intensity of hybridization signals generated using labelled probes prepared from library clones designated B1 (Bacillales-related), S1 (Streptococcus-related), C1 (Clostridiales-related), and L10 (Lactobacillales-related) and targets prepared from ileal contents of C, W, or B-fed pigs correlated closely with the number of genomes of each bacterial group as determined by quantitative PCR. Universal PCR primers were also used to amplify genomic DNA extracted from jejeunal contents of pre- and post-weaning piglets. Labelled probe DNA was prepared from S1, L10, LV (Lactobacillus vaginalis-related) and EC (E.coli) library clones. The resulting signal intensities correlated with quantitative polymerase chain reaction (qPCR) data for L10 and LV, but minimal correlation was observed for the S1 and EC groups. A cpn60- based macroarray has potential as a tool for identification and semi-quantification of shifts in colonization abundance of bacteria in complex communities, providing a similar amount of data as techniques such as denaturation gradient gel electrophoresis or terminal restriction fragment length polymorphism analysis.

The thesis addresses three main problems in the area of user modeling and adaptation in the context of online communities:<p> 1) Dealing with unique and changing user modeling needs of online communities. <p> 2) Involving users in design of the user modeling process.<p> 3) Interoperability of user models across different communities.<p> A new policy based-approach for user modeling is proposed, that allows explicit declarative representation of the user modeling and adaptation process in terms of policies, which can be viewed and edited by users. This policy-based user model framework is implemented in the MCComtella community framework, developed as part of this thesis work, which allows hosting multiple communities, creating new communities by users, and which supports users in setting explicit user modeling policies defining participation rewards, roles and movement of users across communities.

Bacterial communities are fundamental components of many processes occurring in aquatic ecosystems, since through microbial activities substantial amount of matter and energy is transferred from a pool of DOC to higher trophic levels. Previous studies highlighted the beneficial effects of diversity on ecosystem functioning, however studies on the resistance and resilience in microbial communities are scarce. Similarly, studies focusing on factors that might improve resistance or resilience of communities such as the influence of refuges are equally missing, although an understanding of the underlying mechanisms could be very useful in the field of conservation management. In this study, chemostat cultures were used to investigate the influence of a spatial and a temporal refuge on bacterioplankton communities’ resistance and resilience measured in terms of functioning and community composition after applying a salinity pulse disturbance. Respiration rate and substrate utilization were used to estimate bacterial functioning while community composition was determined by using T-RFLP. The perturbation was found to affect bacterial functioning and community composition. Moreover our findings indicate that the resistance and resilience measured in terms of bacterial functioning and community composition were significantly influenced by the provision of refuges.

My research in coastal Ecuador and the northern Gulf of Mexico (GOM) elucidated differences in value of shallow estuarine habitats for fishes and invertebrates. I focused on mangrove and tidal river habitats in Ecuador, and oyster reef, vegetated marsh edge, and nonvegetated bottom habitats in the GOM. Coastal Ecuador has lost 20-30% of mangrove wetlands over the past 30 years. Such habitat loss can impair the ecological functions of wetlands. In this study I identified the fish community of the remaining mangrove wetland in Rio Palmar, Ecuador. For comparison, an adjacent tidal river without mangroves, Rio Javita, was also sampled. I found that although Rios Palmar and Javita are characterized by relatively low fish-species richness compared to other tropical estuarine systems, they appear to provide important habitat for several economically- and ecologically-valued species. In the GOM, I examined the fish and invertebrate communities of adjacent oyster reef (oyster), vegetated marsh edge (VME), and nonvegetated bottom (NVB) habitats. Three main relationships emerged: 1) Oyster and VME provide habitat for significantly more species (as a measure of richness) relative to NVB; 2) Oyster and VME provide habitat for uncommon and rare species; and 3) Many of the species collected in multiple habitats occurred at higher abundances in oyster or VME habitat. Contrary to the current low value ranking of oyster habitat relative to other estuarine and salt marsh habitats, oyster provides high quality habitat for many species. Understanding how key species utilize estuarine habitats is critical for future conservation and management efforts. My research indicated that VME habitat may provide better foraging options for juvenile pinfish (Lagodon rhomboides), and together with corroborating evidence from other studies, suggest that VME provides a critical nursery function for juvenile pinfish, especially in estuaries where seagrass habitat is sparse or nonexistent. Additionally, I documented that juvenile white shrimp (Litopenaeus setiferus) select for oyster habitat because of higher food availability and not because of refuge needs from predation by blue crabs. Oyster habitat appears to provide a nursery function for juvenile white shrimp. Overall, my research demonstrated that structurally complex habitats, such as mangroves, VME, and oyster provide essential habitat at the community, population, and individual levels.

Coral community at Tiaoshi in Nanwan Bay, southern Taiwan was originally dominated by branching Acropora corals which formed some monopolized patches. The community had been changed apparently on a local scale (<2 km) since 1994. Several Acropora patches were almost completely replaced by the solitary sea anemone Condylactis sp. after man-made and typhoon disturbances. However, sea anemones were apparently decreased in 2002. To understand the change of the benthic communities, three areas, including Anemone-dominated, Coral-recovery and Acropora-dominated, at depths of 6 to 10 m were selected and monitored by permanent transects from 2003 to 2005. Each site included three replicate patches. At Anemone-dominated area, the mean cover of sea anemone ranged from 24.6 to 15.3% and that of the hard corals was low with 1.4 to 3.9%. At Coral-recovery area, the mean cover of the hard corals was significantly increased from 21.3 to 38.9%, while macroalgae was significantly decreased from 20.7 to 6.1% and sea anemone was low with 1.4 to 3.0%. At Acropora-dominated area, the cover of the hard corals was ranged from 70.0 to 56.6% while macroalgae and anemone was 1.1 - 3.4% and 3.5 - 4.7%, respectively. In general, the results showed that anemone and macroalgae were decreased and corals were recovery. In addition, the diversity index of coral genera at Anemone-dominated area was higher due to coral recruitment in 2004 and 2005. The new recruits were dominated by Montipora stellata.

The globalization and frequent contact with other nations not only change the private enteritis but also the governments. Government offices related to the public service are seeking ways to improve their efficiency and quality of service in order to boost the competitive advantage of the country. Household Registration Offices is one of the department in the government that closely connect to people¡¦s daily life and its performance represents a part of the government performance, too. Therefore, how to improve the efficiency of administration and service quality of Household Registration Offices is one of the hottest issues currently. The goal of this paper is to investigate how to improve the service quality and satisfactions of the Household Registration Offices in communities of the Kaohsiung county area. This research is based on the survey conducted in the communities within the Kaohsiung County, Taiwan. The design of the survey employs the modified SERVQUAL measure in the PZB service quality concept model combining with 5 major aspects of the Household Registration Offices : ¡§reliability¡¨, ¡§the ability to response¡¨, ¡¨availability¡¨, ¡§assurance¡¨ and ¡§carefulness¡¨ and the other 26 attributes to measure the difference between the service quality providing to the public and the services quality expected from the communities. Moreover, we have conducted deviation analyses on the service quality awareness and satisfaction of the Household Registration Offices according to the population variables in the communities. The analyses include statistic analyses such as description analysis, T test and ANOVA. The conclusion obtained is listed as following points: 1. The expectation to the service quality of the Household Registration Offices from the communities is between important and very important. 2. The actual satisfaction of the communities reports that the service quality provided by the Household Registration Offices is above the satisfy level. 3. The analyses show that the actual service quality observed by the communities and the expected service quality is significantly different. In general, the actual service quality provided is less than the service quality expected. 4.The statistical analyses show that variables such as ¡§gender¡¨, ¡§age¡¨, ¡¨education¡¨, ¡§Household Registration Offices district¡¨ and ¡§overall satisfaction¡¨ has significant differences in the awareness of the service quality. 5. The statistical analyses show that the ¡§age¡¨, ¡§Household Registration Offices district¡¨ and ¡§overall satisfaction¡¨ variables have significant differences in the level of satisfaction. Finally, base on the conclusion of the paper, we also provide suggestions on how to improve the service quality of the Household Registration Offices and its satisfaction rate. We hope our suggestions can be served as the reference for the future studies as well as the guidelines for the government departments.