Tale of two townships: race, class and the changing contours of collective action in the Cape Town townships of Guguletu and Bonteheuwel, 1976 - 2006

This thesis examines the emergence and evolution of ‘progressive activism and organisation’ between 1976 and 2006 in the African township of Guguletu and the coloured township of Bonteheuwel within the City of Cape Town. In doing so it compares both how activism has changed over time (including as a result of democratisation) and how it differed between and within these two communities. Whilst at heart an empirical study of activism it seeks to move beyond the specificities of the cases studied to also draw broader conclusions about the nature and causes of collective action and organisation. Drawing on both social movement and class theory it aims to shed some light on the fundamental question of the relationship between structure and agency - why do people act and what defines the form of action they take? It combines a quantitative study of the changing relationship between race, class and state policy with qualitative studies of activism in Guguletu and Bonteheuwel. These two studies cover in detail: the development and unfolding of the riots of 1976; the great boycott season of 1979/80 which saw large numbers of Africans and coloureds across Cape Town drawn into school, bus and consumer boycotts; the development of activism between 1980 and 1985, including the impact of the United Democratic Front; the township unrest of 1985-7; the transition period between 1988 and 1994; and post-apartheid activism in the two communities. It draws on theories of class which recognise the importance of peoples’ positions within the state’s distributional networks (citizenship), experiences and expectations of social mobility and the impact of historical experience of class formation on expectation (moral economy). In doing this it shows how differences in race, education, age and labour market position all interacted to pattern activism in the case studies. Struggles in Cape Town throughout the period 1976-2006 were not dualistic conflict between classes, races or between the oppressed and forces of global capital, nor were they mechanistic responses to the opening and closing of political space. They were complex coalitions of competing and collaborating class forces which were defined by the underlying nature of the city’s political economy and which emerged in interaction with changing opportunities for action

Developing Biotemplated Data Storage: Room Temperature Biomineralization of L1<inf>0</inf> CoPt Magnetic Nanoparticles

L10 cobalt platinum can be used to record data at approximately sixfold higher densities than it is possible to on existing hard disks. Currently, fabricating L10 CoPt requires high temperatures (≈500 °C) and expensive equipment. One ecological alternative is to exploit biomolecules that template nanomaterials at ambient temperatures. Here, it is demonstrated that a dual affinity peptide (DAP) can be used to biotemplate L10 CoPt onto a surface at room temperature from an aqueous solution. One part of the peptide nucleates and controls the growth of CoPt nanoparticles from solution, and the other part binds to SiO2. A native silicon oxide surface is functionalized with a high loading of the DAP using microcontact printing. The DAP biotemplates a monolayer of uniformly sized and shaped nanoparticles when immobilized on the silicon surface. X-ray diffraction shows that the biotemplated nanoparticles have the L10 CoPt crystal structure, and magnetic measurements reveal stable, multiparticle zones of interaction, similar to those seen in perpendicular recording media. This is the first time that the L10 phase of CoPt has been formed without high temperature/vacuum treatment (e.g., annealing or sputtering) and offers a significant advancement toward developing environmentally friendly, biotemplated materials for use in data storage

Shearwater Foraging in the Southern Ocean: The Roles of Prey Availability and Winds

Background Sooty (Puffinus griseus) and short-tailed (P. tenuirostris) shearwaters are abundant seabirds that range widely across global oceans. Understanding the foraging ecology of these species in the Southern Ocean is important for monitoring and ecosystem conservation and management. Methodology/Principal Findings Tracking data from sooty and short-tailed shearwaters from three regions of New Zealand and Australia were combined with at-sea observations of shearwaters in the Southern Ocean, physical oceanography, near-surface copepod distributions, pelagic trawl data, and synoptic near-surface winds. Shearwaters from all three regions foraged in the Polar Front zone, and showed particular overlap in the region around 140°E. Short-tailed shearwaters from South Australia also foraged in Antarctic waters south of the Polar Front. The spatial distribution of shearwater foraging effort in the Polar Front zone was matched by patterns in large-scale upwelling, primary production, and abundances of copepods and myctophid fish. Oceanic winds were found to be broad determinants of foraging distribution, and of the flight paths taken by the birds on long foraging trips to Antarctic waters. Conclusions/Significance The shearwaters displayed foraging site fidelity and overlap of foraging habitat between species and populations that may enhance their utility as indicators of Southern Ocean ecosystems. The results highlight the importance of upwellings due to interactions of the Antarctic Circumpolar Current with large-scale bottom topography, and the corresponding localised increases in the productivity of the Polar Front ecosystem

Population structure and historical demography of South American sea lions provide insights into the catastrophic decline of a marine mammal population

Hoffman J, Kowalski GJ, Klimova A, Eberhart-Phillips L, Staniland IJ, Baylis AMM. Population structure and historical demography of South American sea lions provide insights into the catastrophic decline of a marine mammal population. Royal Society Open Science. 2016;3(7): 160291.Understanding the causes of population decline is crucial for conservation management. We therefore used genetic analysis both to provide baseline data on population structure and to evaluate hypotheses for the catastrophic decline of the South American sea lion (Otaria flavescens) at the Falkland Islands (Malvinas) in the South Atlantic. We genotyped 259 animals from 23 colonies across the Falklands at 281 bp of the mitochondrial hypervariable region and 22 microsatellites. A weak signature of population structure was detected, genetic diversity was moderately high in comparison with other pinniped species, and no evidence was found for the decline being associated with a strong demographic bottleneck. By combining our mitochondrial data with published sequences from Argentina, Brazil, Chile and Peru, we also uncovered strong maternally directed population structure across the geographical range of the species. In particular, very few shared haplotypes were found between the Falklands and South America, and this was reflected in correspondingly low migration rate estimates. These findings do not support the prominent hypothesis that the decline was caused by migration to Argentina, where large-scale commercial harvesting operations claimed over half a million animals. Thus, our study not only provides baseline data for conservation management but also reveals the potential for genetic studies to shed light upon long-standing questions pertaining to the history and fate of natural populations

Data from: Population structure and historical demography of South American sea lions provide insights into the catastrophic decline of a marine mammal population

Understanding the causes of population decline is crucial for conservation management. We therefore used genetic analysis both to provide baseline data on population structure and to evaluate hypotheses for the catastrophic decline of the South American sea lion (Otaria flavescens) at the Falkland Islands (Malvinas) in the South Atlantic. We genotyped 259 animals from 23 colonies across the Falklands at 281 bp of the mitochondrial hypervariable region and 22 microsatellites. A weak signature of population structure was detected, genetic diversity was moderately high in comparison with other pinniped species, and no evidence was found for the decline being associated with a strong demographic bottleneck. By combining our mitochondrial data with published sequences from Argentina, Brazil, Chile and Peru, we also uncovered strong maternally directed population structure across the geographical range of the species. In particular, very few shared haplotypes were found between the Falklands and South America, and this was reflected in correspondingly low migration rate estimates. These findings do not support the prominent hypothesis that the decline was caused by migration to Argentina, where large-scale commercial harvesting operations claimed over half a million animals. Thus, our study not only provides baseline data for conservation management but also reveals the potential for genetic studies to shed light upon long-standing questions pertaining to the history and fate of natural populations

Data_file

Excel file with 22 microsatellites loci y mitochondrial control region