Do zebra (Equus quagga) select for greener grass within the foraging area?

MSc., Faculty of Science, University of the Witwatersrand, 2011Spatial patterns in topography and forage distribution clearly determine large herbivore movements but our understanding of the foraging strategies that free-grazing herbivores adopt at different temporal and spatial scales is limited. Different foraging response patterns are displayed at different scales. Here fine-scale foraging strategies of Zebra (Equus quagga) were investigated by studying their selection for vegetation greenness in a Southern African savanna. Zebras have high-energy requirements thus the primary productivity and condition of the habitat plays an important role on their movements. Grass greenness was measured by Normalized Difference Vegetation Index (NDVI), a proxy for vegetation productivity and quality. Finer-scale studies are needed to understand the processes leading to a correlation between NDVI and herbivores performance. Data was collected at two different spatial scales, foraging area and feeding station. Food selection was recorded in relation to grass species and grass tuft greenness. Within the foraging area, grass species and greenness within zebra feeding stations were compared with random non used stations. Within the feeding station, species and greenness of grasses eaten by zebra were compared with those of grasses available but not eaten. Zebra selection was not consistent across scales. Although greenness was a factor in selection at feeding station levels and grass tuft levels; feeding station selection was limited to greenness due to season, and selection for species occurred only at the grass tuft level. However, zebra did select for the greener grass tufts within the feeding station even if it meant to eat ‘less palatable’ species (i.e. Eragrostis rigidior) instead of ‘very palatable’ species (i.e. Panicum maximum)

F. R. Leavis : judgement and the discipline of thought

Includes bibliographical references.Digitized at the University of Missouri--Columbia MU Libraries Digitization Lab in 2013. Digitized at 600 dpi with Zeutschel, OS 15000 scanner. Access copy, available in MOspace, is 400 dpi, grayscale

College Students’ Perceptions of the Rates of Various Types of Sexual Violence and the Barriers to Reporting

This study compared the perceived campus, peer, and personal rates of four types of sexual violence (sexual harassment, sexual misconduct, nonforcible sex offense, and forcible sex offense) with the documented rates of these same incidents, based on official campus statistics and U.S. census data on forcible rape. Additionally, the barriers to reporting sexual violence among college students were examined. I hypothesized that the results of this study would reveal a pattern of underreporting on campus for all four types of sexual violence. A total of 807 undergraduate respondents (440 females, 204 males, and 5 individuals that identified as transgender or “other”) completed (n = 643) or partially completed (n = 164) a confidential online survey. The results of the study indicated that each form of sexual violence was significantly underreported on campus when compared to the perceived rates of the participants. Furthermore, female students reported a higher number of salient barriers to reporting sexual violence and also rated each of the 15 barriers examined in this study higher than men. Key implications of theses findings and recommendations for future research are discussed

Teacher and Administrator Perspective of Project-Based Learning

Project-Based Learning (PBL) is a teaching method in which students gain knowledge by working for an extended period of time on a particular question, problem, or challenge. This dissertation examined teacher and administrator perceptions of the impact of project-based learning on elementary students. The study explored PBL’s effects on (a) student academic achievement, (b) student engagement, and (c) students’ ability to inquire and reflect on their learning. What are teacher and administrator perceptions of the effect of project-based learning on student outcomes at a suburban elementary school? Three guiding questions served as the foundation of the study. What is the perception of teachers and administrators with regards to PBL’s effectiveness on student engagement? How do teachers and administrators describe the impact of PBL on student inquiry and reflection? What is the perception of teachers and administrators on PBL’s impact on student academic achievement? Using case study methods this dissertation focused on student engagement, reflection, and academic achievement. Data was gather from teacher and administrator interviews, classroom observations, and student artifacts. Individuals in the study described their experiences with PBL, and how project based learning had affected student outcomes. Purposive sampling was used because the teachers and administrators selected had been through extensive PBL training with the Buck Institute. Participants in the study include two administrators and four teachers who attended the Buck Institute training. The researcher observed student presentations at the end of the project-based learning experience in each of the six classes lead by the selected teachers. Six 45-60 minute observations were conducted to gain further insight into PBL and its implementation in the classrooms of teachers who attended the Buck Institute training. This study contributes to the literature by providing additional information on the effect of PBL on elementary student outcomes

Change in Relationship Satisfaction among Veterans in Couple Therapy

Approximately two-thirds of Americans will live with a romantic partner at some point in their lives, and 75% of individuals marry by age 30. Unfortunately, relationship dissatisfaction is a common occurrence, with as many as one-third of couples reporting relationship distress. Although many forms of couple therapy are effective for improving relationship satisfaction and reduces the risk of divorce among distressed couples, no one form of couple therapy has clearly been established as superior. Moreover, relatively little is known about how and why couple therapy has its effects. Improved understanding of what change may occur, as well as common trajectories of change in couple therapy, would greatly enhance process research on therapy for couple distress. The current study is the only known application of dynamical systems analysis (DSA) and related graphical methods to examining processes of change in couple therapy. In the current study, we investigate the possibility that within-partner therapeutic change in relationship satisfaction may follow a nonlinear or complex trajectory. Moreover, as objects in a system are likely to interact, psychological variables in members of a system are also likely to be reciprocal or bidirectional. Thus, we also investigate how level of or change in one partner’s satisfaction may affect the other’s, and how the strength of this relation may evolve over time, as the degree of synchrony or interdependence between partners may change over the course of therapy or may be moderated by level of relationship satisfaction

A comparative study of behavioural and thermoregulatory responses of blue wildebeest and gemsbok to aridity

A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy Johannesburg, 2018.Future climate change scenarios predict that many arid and semi-arid ecosystems within southern Africa, will get warmer and drier with increased frequency of droughts. Although the effects of climate change may only be apparent over a few decades, understanding the physiological and behavioural flexibility of individuals currently inhabiting hot and dry climates provides an analogue for conditions likely to become prevalent in the future. To enhance our understanding of how a species may respond to future hotter and drier environments, I set out to investigate seasonal variation in behaviour and thermoregulation of two ungulate species with differing water dependency in a semi-arid savanna. I focused on thermoregulatory (body temperature) and behavioural responses (activity and microclimate selection) of the water-dependent blue wildebeest (Connochaetes taurinus), and the arid-adapted gemsbok (Oryx gazella gazella) free-living in the Kalahari. Both species prioritised behavioural thermoregulation in the form of cool microclimate selection during the heat of the day and reduced both diurnal and 24 h activity, particularly when conditions were hot and dry. Both species experienced high maximum 24 h body temperature when conditions were hot and low minimum 24 h body temperatures when conditions were dry, resulting in a large amplitude of 24 h body temperature rhythm during the hot dry period. Yet, wildebeest appeared to be more sensitive to changes in aridity with a larger amplitude of 24 h body temperature rhythm compared to gemsbok (3.1 ± 0.2 °C vs. 2.1 ± 0.5 °C), during the drought. These seasonal analyses imply that the species behavioural and thermoregulatory responses were influenced by seasonal changes in water and forage availability. Low minimum 24 h body temperatures may result from an energy deficit during the dry season, but no study to date has explicitly linked changes in body temperature of free-living ungulates, to forage quality within the environment. I therefore investigated the influence of vegetation greenness on body temperature and activity of blue wildebeest and gemsbok inhabiting the same environment. I then investigated if the responses of gemsbok were heightened in a more arid environment. I used Normalized Difference Vegetation Index (NDVI) as a standardized index of vegetation greenness, which can be considered a proxy for vegetation productivity and quality. Both species reduced total 24 h activity and became hypothermic when exposed to brown vegetation but when exposed to brown vegetation minimum 24 h body temperatures were lower for blue wildebeest compared to gemsbok. When exposed to more extreme aridity, gemsbok showed an exaggerated lowering of minimum 24 h body temperatures. Under conditions of low food availability, the cost of thermoregulation may become too demanding. Therefore, when food resources are limited in quality, wildebeest and gemsbok in arid regions appear to prioritize the conservation of energy over the maintenance of a high body temperature. Within seasonal environments, access to water is often the limiting factor for plants and animals. I therefore investigated how distance to water (i.e., how frequently animals were likely to have accessed drinking water) during the hot season influenced microclimate selection, activity and body temperature of blue wildebeest and gemsbok. Both species selected similarly cool microclimates during the heat of the day, with slight enhancement in the quality of microclimates selected when they were further from water. Both species decreased activity during the heat of the day when they were further from water. Gemsbok were able to compensate for their reduced activity during the heat of the day and showed little change in total 24 h activity, but wildebeest showed a more exaggerated decline in activity during the heat of the day for which they were unable to compensate, i.e. total 24h activity of wildebeest declines when they were further away from water sources. Both species displayed higher maximum 24 h body temperatures when they were further away from water, with the hyperthermia being exaggerated for the wildebeest compared to gemsbok. Hyperthermia in both species resolved following the first rains and likely access to drinking water. Access to water appears to be the primary driver towards hyperthermia in the wildebeest, potentially resulting from dehydration during thermal stress. In summary, I have investigated behavioural and thermoregulatory flexibility that large African ungulates currently inhabiting hot and dry climates currently employ. I have shown that ungulates in the Kalahari may differ in their use of microclimate selection and activity patterns to buffer thermal, energetic and water stressors. My study is unique in that I have looked at where the animal was in space and time and linked it to their physiological and behavioural responses. I have, therefore, quantified microclimate selection, activity and body temperature responses in relation to NDVI and distance to water and have shown that the driving mechanisms behind the seasonal changes of body temperature and activity patterns is access to energy and water. I have further enhanced our existing knowledge and created the link between body temperature, vegetation quality and distance to surface water for antelope of the Kalahari and effectively assessed a functional trait. With climate change predicted to increase ambient temperatures and have less predictable rainfall in the semi-arid Kalahari, wildebeest will be forced to remain within the Kalahari, because historical migratory paths have been blocked by fences, and they may not have the behavioural and physiological flexibility to survive a hotter and drier future.LG201

GENDERED EMBODIMENT, STABILITY AND CHANGE: WOMEN’S WEIGHTLIFTING AS A TOOL FOR RECOVERY FROM EATING DISORDERS

This thesis explores the everyday embodied experiences of women who use amateur weightlifting as a vehicle for recovery from eating disorders. Within online spaces and on social media, women frequently share their experiences of using weightlifting to overcome issues relating to disordered eating, body image, and mental health. In particular, women with a history of eating disorders credit weightlifting to be integral to their recovery journey. However, there is a dearth of research on women’s experiences with exercise during eating disorder recovery and no research that identifies weightlifting as beneficial to this process. To the contrary, discursive links are drawn between the practices of self-surveillance exercised by both eating disorder sufferers and weightlifters alike. In this regard, engagement with weightlifting during eating disorder recovery may signal the transferal of pathology from one set of behaviours to another. That is, from disordered eating to rigid and self-regulatory exercise routines. This thesis examines how women subjectively navigate and make sense of this pathologisation. The data for this research comes from longitudinal semi-structured interviews and photo elicitation with 19 women, living in the United Kingdom, who engaged in weightlifting during their eating disorder recovery. In addition, to build up a holistic picture and to explore how this phenomenon also ‘takes place’ online, I conducted a netnography of the overlapping subcultures of female weightlifting and eating disorder recovery on Instagram. Women’s standpoint theory and interpretative phenomenological analysis are combined to form the underpinning theoretical and analytical tools used to engage with these three rich data sets. Moreover, throughout I draw on an eclectic range of disciplinary perspectives, in order to bring together multiple fields of research and develop novel theoretical frameworks. In the findings, I argue that women’s experiences using weightlifting as a tool for recovery from eating disorders manifests in an embodied sense of multiplicity. In this sense, understandings of the body that are often viewed as ontologically distinct (muscularity/thinness/fatness) hang-together at once in the lived experience of a single individual. I argue that women, particularly those who have previously struggled with an eating disorder, are too readily positioned as vulnerable to media and representation. To theoretically combat these ideas regarding women’s assumed passivity, I develop the concept of ‘digital pruning’ to account for women’s agency in relation to new media. I contend that weightlifting offers women in recovery from eating disorders a new framework for approaching eating and exercise. Specifically, weightlifting’s norms and values legitimate occupying a larger body, which gives women in recovery permission to eat and gain-weight in a way that is both culturally sanctioned and health-promoting. Finally, I explore identity transformation as a specific tenet of recovery from eating disorders. I argue that, on social media, recovery identities are characterised by personal empowerment, resilience, and independence. While offline, quieter and less culturally glorified aspects of recovery (such as relationships of care) are central to women’s accounts of developing a new sense of self as they transition away from an eating disorder identity. In summary, this thesis is an examination of the ways in which women strategically navigate pathology in relation to their bodies, social media, food/exercise practices, and identity. I argue that women develop a set of ‘DIY’ recovery practices that allow them to consciously channel and draw on their negative experiences with eating disorders, to develop new ways of living that serve their overall wellbeing. Weightlifting is integral to this process, as it provides women transitioning out of this difficult phase in their lives with new ways of relating to their bodies and of being in the world. I situate this phenomenon within a neoliberal socio-political climate in which individuals are required to take personal responsibility for their mental health and wellbeing, despite living within conditions which are not conducive to recovery

Slideshow activism on Instagram: Constructing the political activist subject

An emerging activist tactic on visual-based social media such as Instagram, slideshow activism adapts the production and consumption of political information to the logic of the platform. In so doing, slideshow activism provides followers with an ideal subject position for civic engagement. By examining a popular slideshow activist Instagram account, we outline the features of this activist tactic and its mobilizing appeal. The qualitative content analysis of a sample of 50 posts reveals that slideshow activism addresses its followers as individuals who are actively staying well-informed on the social justice dimension of a wide range of political issues and are constantly engaged in self-transformation in order to become better citizens. This ideal, we argue, entrenches social justice as a core political value for civic engagement, and recommends a mix of argumentation and personal transformation as the everyday means for individuals to bring about political change. We further explore the consequences of this subject position for citizen engagement with politics

Eltrombopag for the treatment of chronic idiopathic (immune) thrombocytopenic purpura : A Single Technology Appraisal

Evidence Review Group (ERG) final report for the National Institute for Health and Clinical ExcellencePublisher PD

Floquet-engineered quantum state manipulation in a noisy qubit

Adiabatic evolution is a common strategy for manipulating quantum states and has been employed in diverse fields such as quantum simulation, computation and annealing. However, adiabatic evolution is inherently slow and therefore susceptible to decoherence. Existing methods for speeding up adiabatic evolution require complex many-body operators or are difficult to construct for multi-level systems. Using the tools of Floquet engineering, we design a scheme for high-fidelity quantum state manipulation, utilizing only the interactions available in the original Hamiltonian. We apply this approach to a qubit and experimentally demonstrate its performance with the electronic spin of a Nitrogen-vacancy center in diamond. Our Floquet-engineered protocol achieves state preparation fidelity of $0.994 \pm 0.004$, on the same level as the conventional fast-forward protocol, but is more robust to external noise acting on the qubit. Floquet engineering provides a powerful platform for high-fidelity quantum state manipulation in complex and noisy quantum systems