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Gibbons, Mark J.; Stuart, V; Verheye, H M (NISC and Taylor & Francis, 1992)[more][less]
Abstract: Carnivorous zooplankton in the Benguela system have tended to be ignored by all but early taxonomists and a handful of recent researchers. An attempt is made here to address the importance of carnivores in this system but, because the database is poor, it was necessary to apply material from outside the region. The taxa covered include ctenophores, cnidarians (Scyphozoa and Hydrozoa, including Siphonophora), chaetognaths and hyperiid amphipods as well as such minor groups as pelagic gastropods and decapods. Most groups of carnivores within the Benguela are represented by only one or two "common" species. These tend to be epiplanktonic and generally concentrated inshore of the shelf-break, where their distributions are influenced by changes in local hydrography. Their densities frequently exceed those of herbivores. The dominant carnivores share a number of attributes: wide-ranging diets, high assimilation and growth efficiencies and mostly a Type I functional response to food concentration. They fall into two categories. The first is the gelatinous species, which have short lifespans and exhibit rapid growth and often massive reproductive response to high concentrations of food. They are patchily distributed and some appear to have behavioural traits that enable them to stay within localized patches of prey on which they may be dependent because of high metabolic costs. In the second category are crustacean predators and chaetognaths which have slower response times to the food environment but may have longer lifespans, lower daily maintenance needs and an ability to store lipids. They are less dependent on high densities of food organisms and can survive throughout winter, when gelatinous predators are rare. The effect of predation on abundance of copepods is estimated on the basis of both published and unpublished data. Should swarms of predators coincide with a critical gateway of zooplankton or larvae, then there may be total depletion. This applies especially to the nearshore zone of the West Coast and to semi-enclosed bays. The role of carnivorous zooplankton in the diets of commercially important fish species is stressed, but their importance in the regeneration of nutrients may be insignificant. URI: http://hdl.handle.net/10566/305 Files in this item: 1
GibbonsTrophicEcology1992.pdf (1.199Mb) -
Clifford, Marian; Kerfoot, Caroline (Oxford University Press, 1992)[more][less]
Abstract: In this chapter, the ESL approaches adopted by seven different literacy organisations in South Africa are described and analysed. The approaches are identified in relation to developments in the field of applied linguistics and language teaching. The methods include formalist, functional/communicative approach, competency-based approach, natural growth approach, task-based process approach, popular education and ESL approach. The chapter concludes with principles for adult, popular second language learning curriculum and training. URI: http://hdl.handle.net/10566/217 Files in this item: 1
KerfootLanguageOfHope.pdf (1.060Mb) -
Barange, M; Macpherson, E; Gibbons, Mark J. (NISC and Taylor & Francis, 1994)[more][less]
Abstract: Information on vertical and horizontal distribution patterns, abundance and morphology of the decapod Pasiphaea semispinosa in the Benguela upwelling system is presented. P. semispinosa is the dominant pelagic decapod in the system, occurring between 19 and 32°S along the mid and inner shelf in concentrations of 10-100•m-2• Although it is more abundant during abated than during active upwelling in the northern Benguela, it would appear to be equally abundant during both upwelling scenarios in the southern Benguela. In the southern Benguela, reproductive females are present during winter and juveniles dominate during active upwelling, but juveniles appear to be more common during abated upwelling in the northern Benguela. The estimates of abundance of P. semispinosa presented in this study are subject to sampling biases attributable to their vertical migratory behaviour and net avoidance capabilities. URI: http://hdl.handle.net/10566/307 Files in this item: 1
GibbonsPasiphaea1994.pdf (692.3Kb) -
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) -
Gibbons, Mark J. (NISC (Pty) Ltd and Taylor& Francis, 1995)[more][less]
Abstract: A total of 24 species of euphausiid was collected during a survey along the South African south coast during January 1992. Communities over the Agulhas Bank were of low diversity and abundance and were dominated by Nycliphanes capensis. Those at the shelf-edge were of high diversity and abundance and were dominated by Euphausia recurI'll and Thysalloessa gregaria. Such high diversity may be maintained by vertical scgregation at night. Few species displayed obvious diel vertical migration, although N. capen sis may be able to maintain itself on the shelf by means of this behaviour. E. recurl'Cl appeared to feed on phytoplankton throughout the water column at night, reflecting the distribution of food. URI: http://hdl.handle.net/10566/374 Files in this item: 1
GibbonsEuphausiid1995.pdf (584.2Kb) -
Kerfoot, Caroline (Centre for Education Policy Development (CEPD), 1995)[more][less]
Abstract: In anticipation of the reconstruction and development of the education and training system, the CEPD established a number of curriculum task teams to develop subject-specific curriculum frameworks in line with the vision and principles as outlined in the draft discussion document released by the African National Congress in January 1994 - "A Policy Framework for Education and Training". This chapter presents the interim report of the Adult Basic Education and Training task team. URI: http://hdl.handle.net/10566/218 Files in this item: 1
KerfootABETCurriculum1995.pdf (747.5Kb) -
Lalu, Premesh (Routledge, 1996)[more][less]
Abstract: This article focuses on the lecture-room debates which have been the central feature of the first-year history course at the University of the Western Cape (UWC) since 1993. The UWC History Department takes the position that in first-year teaching the main aim should be to show students that the discipline is always contested and to introduce them to historical argument. The article makes a case for these lecture-room debates as a developmental sequence or series for the induction of first-year UWC students into historical argument in discussion, reading and writing. URI: http://hdl.handle.net/10566/264 Files in this item: 1
Lalu_Staging1996.pdf (730.0Kb) -
Lalu, Premesh; Harris, Brent (Southern African Literature and Culture Centre, UKZN, 1996)[more][less]
Abstract: This article draws inspiration from Jauss's theorisation of the concepts of horizon, reception, and construction. The problem we confront relates to the way we receive, interpret, and apply texts without cognisance of the ways our horizons advance, limit, and intersect with a multiplicity of meanings that might not have been foreseen by the text's contemporaries. What are the distances between public encounters with the past on the one hand, and on the other the testimonies heard by the Commission or readings of trauma offered by social scientists and historians? In this paper we wish to offer a tentative response to this question by reflecting on various readings of the trial of Andrew Zondo and the public testimony of Lephina Zondo at the TRC. We are interested in the ways in which truths, and histories, are produced "by virtue of multiple forms of constraint". URI: http://currentwriting.ukzn.ac.za Files in this item: 1
Lalu_Horizons1996.pdf (1.269Mb) -
Kerfoot, Caroline; Winberg, Chris (Juta & Company Ltd, 1997)[more][less]
Abstract: The book gives detailed and theoretically-grounded practical advice on how to proceed collaboratively through the various stages of the action research cycle, including building a repertoire of literacy practices and activities for teachers and learners to draw upon in the research process. URI: http://hdl.handle.net/10566/221 Files in this item: 1
KerfootActionResearch1997.pdf (3.278Mb) -
Tucker, William D.; Keats, Derek (Telkom, 1998)[more][less]
Abstract: Grafting an ATM network onto an existing Ethernet network is a non-trivial exercise in network configuration. The process of mating ATM technology to an Ethernet network without tampering the underlying backbone and network configuration gives rise to a variety of networking issues including addressing, compatibility, security, efficiency, administrative effort, and scalability. Examples of actual situations serve to illustrate these issues. We have designed several scenarios to tackle the topological problems of an ATM graft. A dual IP approach works but suffers from a lack of scalability. We expect an edge routing solution, with subnetting, will be the most elegant and scalable. URI: http://hdl.handle.net/10566/448 Files in this item: 1
TuckerKeatsATM1998.pdf (612.2Kb) -
Bock, Zannie (University of Stellenbosch, 1999)[more][less]
Abstract: This article outlines the development of a beginner English course called 'Speak Out' for adults in Adult Basic Education and Training classes in the early 1990s. The course uses an innovative roleplay methodology which builds on the experiences and language knowledge of the adult learners. It was conceptualised and developed within a participatory approach to adult learning and materials development. The article explores the tension between the ideals of the participatory approach and the constraints exerted by contextual and other factors. The article begins with an introduction of the context within which the materials were conceptualised, then offers a brief overview' of the participatory approach, and then considers the following aspects of the 'Speak Out' course; the language learning methodology, issues of teacher competence and development, and lastly, the materials development process itself. URI: http://hdl.handle.net/10566/280 Files in this item: 1
BockSpeakOut.pdf (8.863Mb) -
Naidoo, Vaughn; Tucker, William D. (Telkom, 2000)[more][less]
Abstract: With QoS available on IP-dominant NGNs, Policy-based Network Management (PBNM) is an effective mechanism for managing services as opposed to actual devices. IP is ubiquitous, and any NGN must contend with legacy devices that do not support emerging PBNM protocols. This Work in Progress uses the common Internet notion of a proxy to enforce policies on legacy equipment. We use VoIP as a mechanism to test the validity of our intended solution. URI: http://hdl.handle.net/10566/449 Files in this item: 1
NaidooTuckerVoIP2000.pdf (53.16Kb) -
Jeffries, Michael; Tucker, William D. (Telkom, 2000)[more][less]
Abstract: Current VoIP signaling protocols are interoperable with the PSTN SS7 via H.323-to-SS7 or SIP-to-SS7 gateways. As we move toward the Next Generation Network, the PSTN falls away and we work toward carrier-grade VoIP interoperability between H.323, SIP, and other future VoIP signaling protocols. This paper present a Work in Progress to design and implement a solution based on the Internet Protocol itself. URI: http://hdl.handle.net/10566/425 Files in this item: 1
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du Toit, Francois (Juta, 2000)[more][less]
Abstract: This article investigates the limitation of freedom of testation in terms of the boni mores or public policy from a legal-comparative perspective. The limits imposed by public policy on freedom of testamentary disposition in English and Australian law are analysed, and the limitation of freedom of testation in terms of the good morals in Dutch and German law is investigated. It is proposed that the operation of the boni mores or public policy in these jurisdictions holds valuable lessons for future development in South African law. URI: http://hdl.handle.net/10566/229 Files in this item: 1
Stell LR 2000.pdf (13.72Mb) -
Conradie, Ernst (University of Kwazulu-Natal School of Theology, 2000)[more][less]
Abstract: On the background of the current sense of despair concerning the environmental crisis, this article follows the basic intuition that a Christian environmental praxis can only be empowered on the basis of an adequate understanding of Christian hope. Christian eschatology has traditionally responded to three distinct aspects of the human predicament - human self-enclosure, and finitude in both time and space; instigated by an unacceptable present reality, it articulates the conviction of an upcoming transformation into what it ought to be. Investigating the theme of hope in some major ecclesial documents and literature that explicitly addresses the topic written during the struggle, it is argued that the strength of the eschatology developed during that period consists in its return to the prophetic roots of Christian hope. Its concentration on the anthropological aspect of the liberation from the predicament from human sin makes it necessary to rediscover the impact of eschatology on the salvation of creation and the theocentric aspect of hope. URI: http://hdl.handle.net/10566/409 Files in this item: 1
ConradieEschatology2000.pdf (1.633Mb) -
Gibbons, Mark J.; Sulaiman, Amina; Hissman, K.; Schauer, J.; Wickens, Patti; McMillan, Ian (NISC and Taylor & Francis, 2000)[more][less]
Abstract: A semi-quantitative assessment is made of the animals observed in archived videotapes taken from the research submersible Jago, during diamond mining and exploratory surveys off the mouth of the Orange River on the west coast of southern Africa (28° IS'S, 29°11 'S) in November 1996. The seabed environment is described and nekton associations with substratum features are identified. The area is characterized by heterogeneity to its physical and biological struture. The variety of observed nekton is low, and communities are dominated by goby Sufflogobius bibarbatus, juvenile hake Merluccius spp. and cuttlefish Sepia spp. (on soft substrata), as well as false jacopever Sebastes capen sis and kingklip Genypterus capensis (on rocky substrata). URI: http://hdl.handle.net/10566/419 Files in this item: 1
GibbonsDemersalNekton2000.pdf (501.8Kb) -
Lalu, Premesh (University of the Western Cape, 2000)[more][less]
Abstract: This paper deals with cognitive failures and historiographical blind spots in legal and historical representations of the colonised subject. It concerns an archival fragment from the seventeenth century - the suicide of a young woman called Sara in the period of Dutch rule at the Cape. The paper focuses on the production of evidentiary sources and examines the mediations by which a colonial text on subalterns becomes available to the present URI: http://www.jstor.org/stable/41056412 . Files in this item: 1
LaluSara2000.pdf (1.306Mb) -
Lalu, Premesh (Blackwell Publishing, 2000)[more][less]
Abstract: This article focuses on colonial accounts of the killing of the Xhosa chief, Hintsa, in 1835 at the hands of British forces along what came to be known as the Eastern Cape frontier. It explores the evidentiary procedures and protocols through which the event came to be narrated in colonial frames of intelligibility. In proposing a strategy for reading the colo¬nial archive, the paper strategically interrupts the flow from an apartheid historiography to what is commonly referred to as "alternative history." The aim in effecting this interrup¬tion is to call attention to the enabling possibilities of critical history. This is achieved not by way of declaration but rather through a practice whereby the foundational category of evidence is problematized. The paper alludes to the limits of alternative history and its approaches to evidence on the one hand, and the conditions of complicity within which evidence is produced on the other. Whereas alternative history identifies its task as one of re-writing South African history, critical history, it is suggested, offers the opportunity to reconstitute the field of history by addressing the sites of its production and also its prac¬tices. In exploring the production of the colonial record on the killing of Hintsa, the paper seeks to complicate alternative history's slippage in and out of the evidentiary rules estab¬lished by colonial domination even as it constitutes the category of evidence as an object for a politics of history of the present. URI: http://www.jstor.org/stable/2678049 Files in this item: 1
Lalu_Grammar2000.pdf (707.6Kb) -
Glaser, Meryl; Tucker, William D. (Telkom, 2001)[more][less]
Abstract: A Teldem provides text-based telephony services to the deaf. Despite an array of text-based communications mechanisms on the web, the Teldem is the only means of synchronous telecommunication available to a deaf person. We examine a human-assisted relay that provides a bridge between the deaf and the hearing, and then propose several additional bridges. These bridges take advantage of both standard and cutting edge technologies. We present each bridge's impact on the deaf with respect to synchrony, connectivity, independence, and the Digital Divide. It is hoped that by deploying trials for each bridge, we can eventually provide the deaf with equal access. URI: http://hdl.handle.net/10566/613 Files in this item: 1
GlaserTucker-SATNAC2001.pdf (146.9Kb) -
Naidoo, Vaughn; Tucker, William D. (Telkom, 2001)[more][less]
Abstract: Next Generation Networks use policy-based network management and QoS protocols to provide voice services on IP networks. Large numbers of older equipment still push IP packets. We present several solutions that include legacy equipment into a PBNM and QoS system. A static design uses traffic shaping at the legacy edge. A dynamic solution uses a Quasi-PEP implemented over RSVP and COPS. Preliminary test results are presented for the static solution. Collected data shows that the solution decreases packet loss on the legacy side. URI: http://hdl.handle.net/10566/519 Files in this item: 1
NaidooTuckerNextGenNetworks2001.pdf (59.43Kb)
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