Browsing by Title
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Taliep, Naiema; Florence, Maria (Psychological Society of South Africa, 2012)[more][less]
Abstract: The absence of a suitable measure to assess the health-related quality of life (HRQoL) of children and adolescents in South Africa, led to the use of the KIDSCREEN-52 questionnaire which was developed and standardised in Europe. The current study is part of a broader study conducted in the Western Cape, which used the KIDSCREEN-52 to explore the influence of exposure to community violence on the subjective HRQoL of a sample of South African adolescents. This study aimed to investigate the reliability and construct validity of the KIDSCREEN-52 in a South African context. The broader study employed stratified interval criterion sampling to select 565 Grade 9 learners, aged 14-18. Participants were selected from six public schools in areas specified by the South African government as comprising key nodal areas in terms of crime in the Western Cape. The dataset for the current study comprised all participants (N=565) of the primary study. As the initial step in validation of the KIDSCREEN-52 in South Africa, the current study examined its factor structure by means of exploratory factor analysis, using principal component analysis with oblimin rotations. It also assessed the internal consistency reliability of each of the scales, using Cronbach’s alpha. Exploratory factor analysis extracted 10 factors as identified by previous studies, with some deviation in the loadings of the last three factors. Items of two scales (“Feelings” and “About Yourself”) divided into three scales, and “Bullying” items were not sufficiently presented in the factor solution. Internal consistency of the measure was shown to be acceptable to good, with Cronbach’s alpha values ranging from 0.76 to 0.81 for the 10 scales. URI: http://hdl.handle.net/10566/402 Files in this item: 1
TaliepQualityofLife2012.pdf (262.4Kb) -
Goga, Ameena; Dinh, Thu-Ha; Jackson, Debra (South African Medical Research Council, National Department of Health South Africa and PEPFAR/US Centers for Disease Control & Prevention, 2012)[more][less]
Abstract: Aims and Objectives: The overall aim of this evaluation was to conduct a national facility-based survey to monitor the effectiveness of the South African National PMTCT programme. The primary objective was to measure rates of early MTCT of HIV at six weeks postpartum. The secondary objective was to periodically estimate coverage of key PMTCT interventions and services (e.g., HIV testing, CD4 cell count testing, infant antiretroviral (ARV) prophylaxis, infant feeding counselling). URI: http://hdl.handle.net/10566/462 Files in this item: 1
GogaPMTCT2012.pdf (5.124Mb) -
Tylleskar, Thorkild; Jackson, Debra; Meda, Nicolas; Ingrebetsen, Ingunn Marie S; Chopra, Mickey; Diallo, Abdoulaye Hama; Doherty, Tanya; Ekström, Eva-Charlotte; Fadnes, Lars T; Goga, Ameena; Kankasa, Chipepo; Klungsøyr, Jørn I; Lombard, Carl; Nankabirwa, Victoria; Nankunda, Jolly K; Van de Perre, Philippe; Sanders, David; Shanmugam, Rebecca; Sommerfelt, Halvor; Wamani, Henry; Tumwine, James K; PROMISE-EBF Study Group (Elsevier, 2011)[more][less]
Abstract: Background: Exclusive breastfeeding (EBF) is reported to be a life-saving intervention in low-income settings. The effect of breastfeeding counselling by peer counsellors was assessed in Africa. Methods:24 communities in Burkina Faso, 24 in Uganda, and 34 in South Africa were assigned in a 1:1 ratio, by use of a computer-generated randomisation sequence, to the control or intervention clusters. In the intervention group, we scheduled one antenatal breastfeeding peer counselling visit and four post-delivery visits by trained peers. The data gathering team were masked to the intervention allocation. The primary outcomes were prevalance of EBF and diarrhoea reported by mothers for infants aged 12 weeks and 24 weeks. Country-specific prevalence ratios were adjusted for cluster effects and sites. Analysis was by intention to treat. This study is registered with ClinicalTrials.gov, number NCT00397150. Findings 2579 mother–infant pairs were assigned to the intervention or control clusters in Burkina Faso (n=392 and n=402, respectively), Uganda (n=396 and n=369, respectively), and South Africa (n=535 and 485, respectively). The EBF prevalences based on 24-h recall at 12 weeks in the intervention and control clusters were 310 (79%) of 392 and 139 (35%) of 402, respectively, in Burkina Faso (prevalence ratio 2·29, 95% CI 1·33–3·92); 323 (82%) of 396 and 161 (44%) of 369, respectively, in Uganda (1·89, 1·70–2·11); and 56 (10%) of 535 and 30 (6%) of 485, respectively, in South Africa (1·72, 1·12–2·63). The EBF prevalences based on 7-day recall in the intervention and control clusters were 300 (77%) and 94 (23%), respectively, in Burkina Faso (3·27, 2·13–5·03); 305 (77%) and 125 (34%), respectively, in Uganda (2·30, 2·00–2·65); and 41 (8%) and 19 (4%), respectively, in South Africa (1·98, 1·30–3·02). At 24 weeks, the prevalences based on 24-h recall were 286 (73%) in the intervention cluster and 88 (22%) in the control cluster in Burkina Faso (3·33, 1·74–6·38); 232 (59%) and 57 (15%), respectively, in Uganda (3·83, 2·97–4·95); and 12 (2%) and two (<1%), respectively, in South Africa (5·70, 1·33–24·26). The prevalences based on 7-day recall were 279 (71%) in the intervention cluster and 38 (9%) in the control cluster in Burkina Faso (7·53, 4·42–12·82); 203 (51%) and 41 (11%), respectively, in Uganda (4·66, 3·35–6·49); and ten (2%) and one (<1%), respectively, in South Africa (9·83, 1·40–69·14). Diarrhoea prevalence at age 12 weeks in the intervention and control clusters was 20 (5%) and 36 (9%), respectively, in Burkina Faso (0·57, 0·27–1·22); 39 (10%) and 32 (9%), respectively, in Uganda (1·13, 0·81–1·59); and 45 (8%) and 33 (7%), respectively, in South Africa (1·16, 0·78–1·75). The prevalence at age 24 weeks in the intervention and control clusters was 26 (7%) and 32 (8%), respectively, in Burkina Faso (0·83, 0·45–1·54); 52 (13%) and 59 (16%), respectively, in Uganda (0·82, 0·58–1·15); and 54 (10%) and 33 (7%), respectively, in South Africa (1·31, 0·89–1·93). Interpretation: Low-intensity individual breastfeeding peer counselling is achievable and, although it does not affect the diarrhoea prevalence, can be used to effectively increase EBF prevalence in many sub-Saharan African settings. URI: http://hdl.handle.net/10566/516 Files in this item: 2
TylleskarExclusiveBreastfeeding2011.pdf (1.030Mb) -
September, Rose (University of Johannesburg, 2007)[more][less]
Abstract: The author reflects on the findings of a study commissioned by the Human Science Research Council (HSRC). A qualitative research methodology was used to explore the perceptions of service providers in the early childhood development (ECD) sector on job creation through government’s Expanded Public Works Programme (EPWP). The EPWP is aimed at drawing significant numbers of unemployed people into productive work by increasing their capacity to earn a sustainable income through training. In response, the national departments of Social Development, Health, and Education developed a Social Sector Plan (SSP) for EPWP in which the ECD sector was identified as one of the key areas for expansion. From a developmental social work perspective, both Early Childhood Development and productive employment are important strategies to alleviate persistent poverty. This article is intended to create dialogue, further research and action towards realizing the potential of the ECD sector to create more sustainable jobs in order to improve the quality of people’s lives. URI: http://hdl.handle.net/10566/210 Files in this item: 1
SeptemberExpandedWorks2007.pdf (220.1Kb) -
Piper, Laurence; von Lieres, Bettina (Institute of Development Studies, 2011)[more][less]
Abstract: Summary: The paper argues that the practice of democratic mediation is an increasingly common, yet under-researched, component of engagements between citizens and public authorities across the globe. While the actors who mediate (and their tactics) are diverse and are not necessarily of the marginalised group, they share a commitment to overcoming representational, knowledge or ideological deficits in decision-making for the marginalised group. While the ‘speaking for’ nature of democratic mediation clearly opens up critical legitimacy problems, the practice of democratic mediation appears to be remarkably common, and even effective. The paper demonstrates this by surveying at least three kinds of democratic mediation observed across a large number of cases. First is ‘mediation as professional advocacy’. The mediator in these cases is more an ‘interested intermediary’ in contentious policy politics. In a context of skewed powerrelations where certain groups remain systematically marginalised, not least through knowledge and representational deficits, a degree of advocacy is required to get more egalitarian policy dialogue. Second is ‘mediation as representational entrepreneurship’. This refers to engagements between citizens and forms of public authority that stretch from the local to the global level. In more ‘global-local’ mobilisations, mediators are often experts, professionals, and international NGOs. In more ‘local – global’ movements, the mediators are ‘hybrid activists’ deeply rooted in the local identities and associations. However, in either case the actor is distinguished by the taking of initiative to include the voices of the marginalised in a domain of power-relations which is multi-level. Lastly, ‘mediation as citizenship development’ refers to forms of activism typically associated with community and capacity development, and usually involves limited advocacy by civil society organisations (CSOs). Hence there 04 IDS WORKING PAPER 364 may be little by way of explicit mediation in local governance decision-making in these cases, although the empowerment of communities has a demonstrable and mostly positive impact on local governance. URI: http://hdl.handle.net/10566/480 Files in this item: 1
PiperDemocraticMediation2011.pdf (1.662Mb) -
Stern, Ruth; Puoane, Thandi; Tsolekile, Lungiswa (Centers for Disease Control and Prevention, 2010)[more][less]
Abstract: Introduction Noncommunicable diseases are increasing in developing countries, exacerbated by growing urbanization. We examined the experiences and perceptions about noncommunicable diseases of people who migrated from rural areas to urban Cape Town, South Africa. Methods We conducted a qualitative study in an impoverished periurban township that has a noncommunicable disease prevention program, including health clubs. We used in-depth interviews, participatory reflection and action groups, and focus group discussions. Results Participants described changes in eating patterns and levels of physical activity. These changes were a result of socioeconomic and environmental constraints. However, respondents were not concerned about these changes. Despite hardships, they were pleased with their urban lifestyle. Furthermore, they approved of their weight gain because it signified dignity and respect. Participants who attended health clubs found them informative and socially and emotionally supportive. Conclusion The study highlighted the complexity of the risk factors for noncommunicable diseases and the need to develop prevention strategies that extend beyond the traditional focus on diet and exercise. URI: http://hdl.handle.net/10566/292 Files in this item: 1
PuoaneExplorationNCD2010.pdf (381.1Kb) -
Nankwanga, Annet; Phillips, Julie; Neema, Stella (Faculty of Community and Health Sciences, University of the Western Cape, 2009)[more][less]
Abstract: Introduction: This paper presents HIV/AIDS experiences of elderly persons in Uganda as revealed by an ongoing descriptive cross-sectional study covering eight districts, namely: Pallisa, Kampala, Jinja, Lira, Nebbi, Ntungamo, Luwero and Mbarara. These districts represent both the rural and urban areas of the four regions of Uganda, including: Western, Northern, Eastern and Central region. Methods: The study employed a mixed method approach using a sequential exploratory strategy. Data was collected using not only focus group discussions and in-depth interviews held with 165 elderly persons but also a validated interview schedule administered to 50 key informants. Elderly persons participated in the study by providing data on their HIV/AIDS-related experiences. Key respondents were selected to provide data on strategies that could be adopted to curb the effects of the epidemic. This paper is based on one of the study's objectives, which focussed on exploring the effects of HIV/AIDS on Uganda's elderly people; coping mechanisms used to deal with HIV/AIDS; and strategies for curbing its effects. Data was analysed using content analysis and the descriptive method of SPSS. Results: Results show that HIV/AIDS affected most of the elderly people in Uganda by killing their children and spouses, and leaving them with a big burden of taking care of AIDS orphans; yet majority of these people were financially too incapacitated to shoulder it amply. HIV/AIDS also infected the elderly people. The epidemic introduced the need for ARVs and other health services that elderly people found too difficult to access due to poor health service delivery systems in Uganda. Most elderly people used food cultivation as a mechanism for coping with the burden of orphans. These results lead to recommending that government should economically empower elderly people through formulation and effective implementation of welfare policies regarding pension and special fund for these people. Conclusion: There is a need for the government to provide adequate and free HIV/AIDS-related health services and also increase educational support for HIV/AIDS orphans. URI: http://hdl.handle.net/10566/121 Files in this item: 1
AnnetHIV2009.pdf (178.8Kb) -
Muntingh, Lukas (Community Law Centre, University of the Western Cape, 2009)[more][less]
Abstract: In the past 15 years much research has been conducted on the prison system in South Africa focusing on governance, law reform and human rights. It is, however, of particular concern that the voices of prisoners and ex-prisoners had not been heard in the current discourse. This marginalisation of prisoners’ views is in all likelihood symptomatic of their marginalisation in broader society. This research project gathered information from ex-prisoners about their experiences during and after imprisonment. URI: http://hdl.handle.net/10566/231 Files in this item: 1
MuntinghExprisonersViews2009.pdf (309.7Kb) -
Moshabela, Mosa; Schneider, Helen; Silal, Sheetal; Cleary, Susan (BioMed Central, 2012)[more][less]
Abstract: Background: In low-resource settings, patients’ use of multiple healthcare sources may complicate chronic care and clinical outcomes as antiretroviral therapy (ART) continues to expand. However, little is known regarding patterns, drivers and consequences of using multiple healthcare sources. We therefore investigated factors associated with patterns of plural healthcare usage among patients taking ART in diverse South African settings. Methods: A cross-sectional study of patients taking ART was conducted in two rural and two urban sub-districts, involving 13 accredited facilities and 1266 participants selected through systematic random sampling. Structured questionnaires were used in interviews, and participant’s clinic records were reviewed. Data collected included household assets, healthcare access dimensions (availability, affordability and acceptability), healthcare utilization and pluralism, and laboratory-based outcomes. Multiple logistic regression models were fitted to identify predictors of healthcare pluralism and associations with treatment outcomes. Prior ethical approval and informed consent were obtained. Results: Nineteen percent of respondents reported use of additional healthcare providers over and above their regular ART visits in the prior month. A further 15% of respondents reported additional expenditure on self-care (e.g. special foods). Access to health insurance (Adjusted odds ratio [aOR] 6.15) and disability grants (aOR 1.35) increased plural healthcare use. However, plural healthcare users were more likely to borrow money to finance healthcare (aOR 2.68), and incur catastrophic levels of healthcare expenditure (27%) than non-plural users (7%). Quality of care factors, such as perceived disrespect by staff (aOR 2.07) and lack of privacy (aOR 1.50) increased plural healthcare utilization. Plural healthcare utilization was associated with rural residence (aOR 1.97). Healthcare pluralism was not associated with missed visits or biological outcomes. Conclusion: Increased plural healthcare utilization, inequitably distributed between rural and urban areas, is largely a function of higher socioeconomic status, better ability to finance healthcare and factors related to poor quality of care in ART clinics. Plural healthcare utilization may be an indication of patients’ dissatisfaction with perceived quality of ART care provided. Healthcare expenditure of a catastrophic nature remained a persistent complication. Plural healthcare utilization did not appear to influence clinical outcomes. However, there were potential negative impacts on the livelihoods of patients and their households. URI: http://hdl.handle.net/10566/547 Files in this item: 1
MoshabelaAntiretroviralTherapy2012.pdf (419.5Kb) -
Kanyoni, Maurice; Phillips, Julie (Faculty of Community and Health Sciences, University of the Western Cape, 2009)[more][less]
Abstract: Background: The size of the elderly population both in numbers and proportions of the whole world is increasing rapidly. The increase in the number of elderly people in the world will exert a big impact on health and social services. It is established that physical activity is one way of limiting age related disabilities. Objectives: This study aims to asses the levels of physical activity and the factors associated with it among older adults in selected institutions for the elderly in the Southern Province of Rwanda. Method: A cross-sectional descriptive study was conducted at 2 institutions for older adults in Rwanda. An interview questionnaire with close-ended questions was used to collect data. Results: More than one-third of the study sample was categorized as sedentary. Physical activity levels decrease with age. Females reported higher prevalence of physical activity than males. Conclusion: Older adults should be encouraged to engage in physical activity to gain the physical and mental health benefits associated with it. URI: http://hdl.handle.net/10566/114 Files in this item: 1
KanyoniPhysicalActivity2009.pdf (62.78Kb) -
Mabunda, Jabu; Bradley, Hazel A. (LAM Publications Ltd, 2011)[more][less]
Abstract: The purpose of the study was to assess factors contributing to poor performance of Directly Observed Treatment Short-Course (DOTS) in Mopani district of Limpopo Province, South Africa. An exploratory qualitative approach was used to investigate the factors that contribute to poor performance of the DOTS Strategy. Four focus group discussions were conducted, two with Directly Observed Therapy (DOT) Supporters and two with patients on treatment for more than 6 months. The focus groups (4) discussions were tape-recorded. Data collected were descriptively analyzed using thematic methods. The patients generally found supervision of TB treatment helpful as they were motivated and encouraged to continue treatment. Some of the aspects identified as being unhelpful were the inconvenient times for treatment support and stigma due TB supporters’ visit to patients home. Patients often preferred family members as supporters, whereas health workers favoured trained volunteers as DOT supporters. Other factors affecting DOTS were poverty, food shortage, cultural beliefs, and side-effects of the medication. Patients receiving disability grants prefer to remain uncured so as to continue receiving the grant. Behavioural factors seem to play a major role in noncompliance with TB treatment. The findings of the study support the importance of initial counseling and motivation of patients in improving adherence in the programme. Self-motivation was mentioned rather than the motivation from the DOT supporters. Further exploration of alternative DOTS supporters other than trained volunteer demands further investigation. URI: http://hdl.handle.net/10566/315 Files in this item: 1
MabundaTBDOTS2011.pdf (108.3Kb) -
Figaji, Tamara; Phillips, Julie (Faculty of Community and Health Sciences, University of the Western Cape, 2010)[more][less]
Abstract: BACKGROUND: Although the health benefits of physical activity have been proven, many children and adolescents still do not meet the recommended guidelines for sufficient physical activity. The purpose of this investigation was thus to examine the levels of PA, and learners perception of support from teachers, family and friends at an independent school in the Western Cape. Furthermore, the investigation aimed to examine the influence of social support on physical activity. METHOD: A cross-sectional design using quantitative methods was used in this study, which included 100 learners in the senior phase of the school (i.e. grades 5 to 7). The data was obtained with a self-admininstered questionnaire. The data was analyzed with the Statistical Package for Social Sciences (SPSS) version 16.0. The Chi-square test was used to explore associations between nominal and numerical data. The T-test was used to determine statistical significance between groups (independent t-tests) and within groups (paired sample t-test). RESULTS: Overall the sample responded positively when asked about support for physical activity from teachers. Furthermore, the study sample had a positive perception of both physical education (PE) and physical activity (PA) enjoyment. Boys participated in vigorous physical activity significantly more regularly than girls. CONCLUSION: As children are spending a considerable time at school, teachers, friends and parents should be encouraged to be supportive of their participation in physical activity. URI: http://hdl.handle.net/10566/181 Files in this item: 1
FigajiPhillips2010.pdf (58.32Kb) -
Piper, Laurence (University of Natal Press, 2009)[more][less]
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Malherbe, Vertrees C.(University of Cape Town) (Published by History Department, University of the Western Cape, 2010)[more][less]
Abstract: In the wake of the mineral revolution, and the Cape Colony’s attainment of responsible government, Cape Town’s population doubled in the nineteenth century’s latter years. Its largely British ruling class, seeing opportunities for wealth and a greater significance in empire and world, sought to construct a social order conducive to those goals. Faced with increasing ethnic heterogeneity, gender imbalance due to the numbers of male immigrants, and frustration in combating the endemic poverty and slums, city fathers and their closest colleagues – doctors, clergy – perceived the way forward in terms not of extending rights but of moral reform. This article carries the ongoing investigation of family life and law in Cape Town through the Victorian period. It examines legal enactments and social developments where they impacted on marriage, divorce, concubinage and related matters, with particular reference to the welfare of children and those born out of wedlock. URI: http://hdl.handle.net/10566/205 Files in this item: 1
MalherbeFamilyLaw2010.pdf (257.8Kb) -
Hughes, Gail; Hoyo, Catherine; Puoane, Thandi (South African Medical Association, 2006)[more][less]
Abstract: BACKGROUND: In South Africa, former apartheid laws encouraged rural males seeking employment to migrate to urban areas, moving weekly, monthly or annually between their rural families and urban workplaces. The combination of the migrant labour system and long family separations caused an explosion of serious health consequences, among others sexually transmitted infections (STIs) in the migrant population. OBJECTIVE: To describe some correlates of male migration patterns for the rural women left behind, especially the fear of STIs that this engendered in them and their risk-avoidance behaviour. Setting and subjects. In KwaZulu-Natal, 208 prenatal patients who were partners of oscillating male migrant workers were interviewed to determine their demographic and behavioural characteristics, and their fear of STIs. RESULTS: Thirty-six per cent of the rural women said that they were afraid of contracting STIs from their returning migrant partners. Women who saw their partners infrequently were more fearful of STI transmission, and were less able to have sexual communication. However, almost none of the women protected themselves, while only 8% used condoms, primarily for contraceptive purposes. CONCLUSIONS: These results reflect the gender-based power relationships of South African male migrants and their rural partners, the social and economic dependency of the women on their migrant partners, and the women’s social responsibility to bear children. The results point to the need to go beyond interventions that simply seek to modify behaviour without altering the forces that promote risk taking and discourage risk reduction, and the need to develop appropriate interventions to curb STIs and decrease HIV. URI: http://hdl.handle.net/10566/260 Files in this item: 1
PuoaneSTIs2006.pdf (563.5Kb) -
Dewing, Sarah; Matthews, Catherine; Schaay, Nikki; Cloete, Allanise; Simbayi, Leickness; Chopra, Mickey (Springer, 2011)[more][less]
Abstract: This case study with one lay adherence counsellor assessed the implementation of Options for Health, a sexual risk-reduction intervention based on Motivational Interviewing (MI), in an antiretroviral clinic in Cape Town, South Africa. In most cases Options was not delivered with fidelity and less than one-third of intended recipients received it; the counsellor often forgot to do Options, was unsure how to deal with particular cases and felt that there was not always time to do Options. Options was not implemented in a way that was consistent with MI. Revisions to the implementation plan and training programme are required. URI: http://hdl.handle.net/10566/473 Files in this item: 1
DewingAntiretroviralClinic2011.pdf (162.5Kb) -
Khan, Sadika (South African Dental Association (SADA), 2009)[more][less]
Abstract: This article focuses on educational research conducted at the newly merged UWC faculty of dentistry. The research emphasises the change in teaching methods employed to address the concerns experienced in teaching the new large classes as observed in the prosthetic techniques module. These educational interventions were conducted over 5 years and the study design included the principles of action research. Students were assisted in learning the theory of the practical procedures and the subsequent completion of these procedures with the accurate application of the theoretical concepts. Changes in the teaching methods enhanced students learning and successful translation of the theory into practical work. The active learning exercises incorporated into the teaching further motivated and assisted students with deep learning. The debates indicated that students know and accept the value of the module as part of their training. URI: http://hdl.handle.net/10566/224 Files in this item: 1
KhanActionResearch2009.pdf (354.1Kb) -
Fessha, Yonatan Tesfaye (Centre International de Formation Européenne, 2012)[more][less]
Abstract: The history of federalism in Africa is a history of ambivalence. In the run up to independence, federalism was an idea that galvanized several political movements that, following the retreat of colonial powers, emerged to represent the interest of ethnic groups that were anxious about their political status in post colonial Africa. But it was also an idea that was subsequently rejected by those that wield state power and thrown into historical dustbins. Recent developments indicate that the federal idea that was never given a chance to develop and was being strangled at birth is now re-entering the constitutional scene of several African countries. This short article examines how African federations have responded to the ethnic diversity that characterizes their societies. In particular, it examines how the territorial autonomy solution, implicit in these federations, have helped to deal with the challenges of ethnic diversity. URI: http://hdl.handle.net/10566/534 Files in this item: 1
FesshaEthnicDiversityAfrica2012.pdf (203.3Kb) -
Gibbons, Mark J.; Stuart, V (NISC and Taylor & Francis, 1994)[more][less]
Abstract: The feeding biology and the vertical migration of Sagitta friderici were examined over 24 h at two stations in the southern Benguela during spring (October) 1987. Together with studies conducted during summer (February 1991) and winter (May 1984), they serve to allow valuable generalizations of the biology and ecology of this abundant chaetognath. Populations migrate vertically and feed nocturnally, although the timing and the extent of migration vary between studies. S.friderici exhibits ontogenetic layering and the cross-shelf distribution of maturity stages differs, suggesting that it is able to take advantage of cross-shelf water movement in order to maintain populations in the nearshore waters of the West Coast. S.friderici prey almost exclusively on copepodg (cannibalism is rare), and there is a positive relationship between the lengths of predator and prey that is influenced by the size structure of the prey environment. This casts doubt on the validity of a chaetognath species-specific relationship between predator and prey size. S. friderici selects its prey on the basis of size, and not species. Daily ration is related linearly to prey density, so reflecting the low density of prey and providing support for theoretical predictions regarding ingestion rates under oceanic conditions. The impact of S. friderici predation on the copepod assemblage is generally less than 3% of the standing stock, although it could be much higher under conditions of low copepod biomass and poor secondary production. URI: http://hdl.handle.net/10566/306 Files in this item: 1
GibbonsFeeding1994.pdf (866.4Kb) -
Chitedze, Zimani; Tucker, William D. (Telkom, 2012)[more][less]
Abstract: This paper shows that mobility management protocols for infrastructure Internet may be used in a wireless mesh network environment. Mesh topology tends to be an unplanned graph and routes change dynamically and in this research Mobile IPv6 and Fast Handover for Hierarchical Mobile IPv6 are successfully implemented in a wireless mesh network environment. Horizontal handover simulation with ns2 involved Mobile IPv6 and Fast Handover for Hierarchical Mobile IPv6 applied to wireless mesh networks. Mobile IPv6 was used as a baseline to compare the performance of the two protocols. The results show that in mesh networks, Fast Handover for Hierarchical Mobile IPv6‘s performance is superior to Mobile IPv6. Fast Handover for Hierarchical Mobile IPv6 generates more throughput and less delay than Mobile IPv6. Furthermore, Fast Handover for Hierarchical Mobile IPv6 drops fewer data packets than Mobile IPv6. Even though MIPv6 and its extensions are for infrastructure networks, they can be used effectively in mesh networks. URI: http://hdl.handle.net/10566/424 Files in this item: 1