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Search Results: 1 - 10 of 8333 matches for " Victor Wepener "
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Macroinvertebrate Assemblage Changes as an Indicator of Water Quality of Perennial Endorheic Reed Pans on the Mpumalanga Highveld, South Africa  [PDF]
Arno R. de Klerk, Victor Wepener
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.47A002

Reed pans are a very uncommon type of endorheic wetland, and as such the amount of information available is very limited. Thus, they are being impacted on by various agricultural, livestock and other anthropogenic activities. The objectives of this study were to determine the spatial and temporal variations of macroinvertebrate community structures in reed pans and the environmental factors (i.e., water quality) responsible for the maintenance of these structures. Reed pans were studied over four different seasons, during which time subsurface water, sediment and macroinvertebrate samples were collected and analyzed. The reed pans studied showed that the macroinvertebrates were able to reflect various changes in reed pans with regard to seasonal variability and anthropogenic impacts on water quality. These anthropogenic impacts caused the disappearance of sensitive macroinvertebrate taxa and the increase of tolerant macroinvertebrate taxa.

Gebed in die liturgie: ‘n prakties-teologiese verkenning
C Wepener
Acta Theologica , 2012,
Abstract: For many worshippers, prayer in the worship service is not always appropriated positively. In this article, a practical theological exploration regarding prayer in the liturgy is undertaken. By means of a spiral movement between theory and praxis, the phenomenon is scrutinised. After a description of the current practice and an attempt at explaining this state of affairs, the work of three liturgists is presented for a more normative perspective. Finally, some guidelines are formulated for a renewed theory for praxis in the light of the preceding exploration. In essence, it is argued that prayer is an essential part of the Reformed liturgy for which good preparation is essential and that a re-appreciation of the rightful place and meaning of (different forms of) prayer in the liturgy can contribute to enrich the practice for both worshippers and those leading in worship. Article text in Afrikaans
Resensie: "Die onsienlike son"
C Wepener
Tydskrif vir letterkunde , 2013,
Abstract: Die onsienlike son. Jacobus van der Riet. Pretoria: Protea Boekhuis, 2012. 104 pp. ISBN: 978-1-86919-751-3.
Carbon, nitrogen and phosphorus fluxes in four sub-tropical estuaries of northern KwaZulu-Natal: Case studies in the application of a mass balance approach
V Wepener
Water SA , 2007,
Abstract: There are currently no South African nutrient standards for estuarine waters since the concentration of nutrients in the water column will not necessarily be predictive of the response by aquatic biota. In this paper a more suitable approach to assessing nutrients in relation to ecosystem integrity is proposed through compiling a nutrient mass balance for an estuary, which can identify major sources and sinks of nutrients. Recently there has been a move to develop budgets that link several variables using known stoichiometric relationships using limited data availability to infer underlying fluxes. The LOICZ biogeochemical budgeting protocol was applied to data from the Mhlathuze, Mvoti, Nhlabane and Thukela Estuaries in KwaZulu-Natal. Results indicated that these estuaries are all net sources of dissolved inorganic nitrogen and phosphates. The application of the flux-derived parameters used in the LOICZ modelling approach was used to demonstrate how nutrient assessment categories can be assigned to estuaries. As the LOICZ-derived fluxes represent steady-state conditions these were regarded as the reference/benchmark or present ecological state conditions. Alterations in the nutrient assessment category are demonstrated using hypothetical conditions in the Mhlathuze Estuary.
Entering the field: Initiating Liturgical Research in an African Independent Church (AIC)
C Wepener, M Barnard
Acta Theologica , 2010,
Abstract: African Independent Churches (AICs) have been studied by scholars from various disciplines, especially Missiology and Anthropology, making use of various methods including participatory observation. In Ritual and Liturgical Studies, AICs and their abundance of rituals is still a rather under-explored field of research with several reasons making it a difficult area to access. In this article, one aspect of participatory observation in researching ritual action in AICs will be explored, namely the initial phase of entering the field. Real examples from a current South African National Research Foundation (NRF)-funded research project as conducted by a team of scholars including some from the field of Ritual and Liturgical Studies will first be described and thereafter discussed. Diachronically, the initial phase stretching from a pre-proposal workshop until the first attendance of a worship service in a local congregation is sketched and commented upon.
The influence of land use on water quality and diatom community structures in urban and agriculturally stressed rivers
G Walsh, V Wepener
Water SA , 2009,
Abstract: Epilithic diatom communities offer a holistic and integrated approach for assessing water quality as they remain in one place for a number of months and reflect an ecological memory of water quality over a period of time. The objective of this study is to use diatom assemblages to distinguish between particular land types and associated water quality impacts that are linked to these land-use patterns. Water quality and diatom community data were collected from sites in the Crocodile and Magalies Rivers (Gauteng and North West Province, South Africa) associated with agricultural, urban and natural (reference) adjacent land use respectively. The data collected were subjected to multivariate statistical techniques to analyse spatial and temporal patterns in water quality (principal component analysis) and diatom community structures (non-metric multidimensional scaling) to elucidate hypothesised differences in community structure per land-use type. Five diatom response indices (Generic Diatom Index, Specific Pollution Sensitivity Index, Biological Diatom Index, Eutrophication/Pollution Index and Percentage Pollution Tolerant Valves) incorporated in the OMNIDIA software were implemented to assess the integrity of diatom communities per land-use type. Principle component ordination of water quality describes 56.6% of the variation in data observed, and indicates the separation of reference sites from test sites for low and high flow conditions combined. It was, however, not possible to distinguish between the agricultural and urban land-use sites using PCA based on water quality data. One-way ANOSIM showed a significant difference ( p <0.05) between reference groups, agricultural groups and urban groups, with no significant differences noted ( p > 0.05) between groups made up of sites exhibiting the same land-use patterns. Diatom indices showed that agricultural sites were in a slightly more modified ecological state than urban sites overall. Based on the species similarity (SIMPER analyses), reference sites showed strong associations with Achnanthes minutissima, Gomphonema venusta and Cocconeis placentula var. euglypta, whilst urban sites were associated with Diatoma vulgaris, Navicula tripunctata and Amphora pediculus. Agriculture could be separated into high- and low-intensity practices based on species composition. Sites where high-intensity agriculture took place were dominated by motile species of the genus Nitzschia, and low-intensity agriculture was indicated by motile species of the genus Navicula. Urban sites contained a combination of species that were tolerant of spikes in water quality.
A note on the concentrations and bioavailability of selected metals in sediments of Richards Bay Harbour, South Africa
V Wepener, LA Vermeulen
Water SA , 2005,
Abstract: Sediments are considered to be the ultimate sink for most contaminants and therefore pose the highest risk to these aquatic environments. This paper presents the levels of metals in sediments from Richards Bay Harbour, 20 years after the construction of the harbour and studied spatial and temporal, as well as the proportion of the bioavailable metal fraction. Sediment samples were collected from nine sites in Richards Bay Harbour. Sequential extractions of metals were carried out and samples were analysed for aluminium, chromium, copper, iron, manganese and zinc. Metal concentrations in sediment samples varied only slightly between seasons but showed significant spatial variation, which was significantly correlated to sediment particle size composition. Highest metal concentrations were found in sites with substrata dominated by fine mud. Manganese and Zn had more than 50% of this concentrated in the easily reducible fractions. Zinc concentrations were not elevated when compared to historic data. More than 70% of Cr was concentrated in the inert fractions nevertheless concentrations recorded at some sites were still above action levels when considering only the bioavailable fractions.
‘n Eredienshandleiding
Cas J. Wepener
HTS Theological Studies/Teologiese Studies , 2010, DOI: 10.4102/hts.v66i1.998
Abstract: How to cite this book review: Wepener, C.J., 2010, ‘‘n Eredienshandleiding’, HTS Teologiese Studies/Theological Studies 66(1), Art. #998, 1 page. DOI: 10.4102/hts.v66i1.998
Reclaiming space for learning in liturgical contexts: Cracks in the maxim of the uselessness of liturgical ritual
Marcel Barnard,Cas Wepener
HTS Theological Studies/Teologiese Studies , 2012,
Abstract: The problem addressed in this article is, that empirical and theoretical research appears to demonstrate that liturgy often aims at certain results. This, however, puts the widely accepted notion in Liturgical Studies of the so-called uselessness of liturgical ritual under pressure. Against this background in Liturgical Studies the aim of this article is to reclaim space in academic discourses on liturgy for learning in liturgical contexts. The latter is done by presenting several liturgical models, revisiting arguments regarding the (non) functionality of ritual or religion and also by reflecting on ritual-liturgical data that the authors personally collected as part of two research projects.
Wat maak ‘n kerkorrel gereformeerd? ‘n Verkenning van Afrikaanse ‘gereformeerde’ musiek in die jare 1980 en 1990 in Suid-Afrika
Cas J. Wepener
Verbum et Ecclesia , 2012,
Abstract: In this article, the meaning of a combination of the adjective ‘reformed’ and the noun ‘music’ is explored. The main question is: What can be termed ‘reformed music’? In order to answer this question, some of the work on liturgy by the theologians Smit, Old and McKee will be explored, specifically their understanding of ‘reformed liturgy’. Throughout, the article takes the form of a historical reflexive autoethnographic journey into the life and experiences of the author of this article in the period roughly stretching from 1986 to 1996. In particular, it focuses on the way in which the author appropriated two different kinds of music genres. His exposure to both reformed church music and the alternative Afrikaans music movement, which included rock bands such as Johannes Kerkorrel en die Gereformeerde Blues Band will be scrutinised. Ultimately, the aim of this journey is to establish which one of these two music genres from this specific period in the history of South Africa is worthy of the name’reformed music’.
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