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Articles de revues sur le sujet « Lowveld »

Auteur : Grafiati
Publié le 4 juin 2021
Mis à jour le 8 février 2022

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1

Zambatis, N. « Ferns and flowering plants of Klaserie Private Nature Reserve, eastern Transvaal : an annotated checklist ». Bothalia 24, no 1 (10 octobre 1994) : 37–53. http://dx.doi.org/10.4102/abc.v24i1.751.

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An annotated checklist of the plant taxa of the Klaserie Private Nature Reserve, eastern Transvaal Lowveld, is presented. Of the 618 infrageneric taxa recorded, six are pteridophytes and the remainder angiosperms. Of these, 161 are monocotyledons and 451 dicotyledons. Five of the latter are currently listed in the Red Data List of the Transvaal, two of which are first records for the Transvaal Lowveld. The vegetation of the reserve shows strong affinities with the Savanna Biome, and to a lesser degree, with the Grassland Biome.
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Pretorius, I., et H. Rautenbach. « A Long-term synoptic-scale climate study over Mariepskop, Mpumalanga, South Africa ». Clean Air Journal 22, no 2 (3 décembre 2012) : 2–6. http://dx.doi.org/10.17159/caj/2012/22/2.7076.

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Mariepskop forms part of the northernmost edge of the Drakensberg Mountain range and is known for its complex topography associated with meso-scale atmospheric circulation, and therefore its numerous climatic zones. The mountain hosts a high biodiversity. The peak of Mariepskop lies at approximately 1900m Above Mean Sea Level (AMSL), which is higher than the surrounding escarpment to the east. Its foothills also extend well into the Lowveld at about 700 m AMSL. Mariepskop is therefore ideal for studying airflow exchange between the industrial Highveld and the Lowveld with its diversity of natural resources. It is also ideal for detecting global warming signals on altitudinal gradients extending from the Lowveld to altitudes above the Highveld escarpment. In this study long-term National Centre for Atmospheric Research / National Centre for Environmental Prediction (NCAR/NCEP) wind data at two atmospheric pressure levels (850 and 700 hPa), as well as near-surface temperature data, were obtained for the Mariepskop region for the summer (December-January-February: DJF (1981-2011 )) and winter (June-July-August: JJA (1980-2012)) seasons. The data was used to study synoptic wind flow across the mountain in the upper (700 hPa) and lower (800 hPa) atmosphere, as well as near-surface temperature gradients. During the summer season, east-south-easterly and south-easterly winds were found to be the most prominent. These winds are commonly associated with both continental and ridging anticyclonic conditions. During winter, the predominant wind direction at 850 hPa is south-easterly, which is also due to the influence of ridging anticyclones, while at 700 hPa the dominant winter wind direction becomes west-south-west, which is due to the more frequent eastward passing of cyclonic frontal systems across the Highveld towards the Lowveld. Long-term near-surface temperatures exhibit a weak increasing linear temperature trend for both seasons, which might be due to global warming.
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Scoones, Ian, Blasio Mavedzenge et Felix Murimbarimba. « Sugar, People and Politics in Zimbabwe’s Lowveld ». Journal of Southern African Studies 43, no 3 (15 septembre 2016) : 567–84. http://dx.doi.org/10.1080/03057070.2016.1187972.

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Chingwena, G., S. Mukaratirwa, T. K. Kristensen et M. Chimbari. « Larval trematode infections in freshwater snails from the highveld and lowveld areas of Zimbabwe ». Journal of Helminthology 76, no 4 (décembre 2002) : 283–93. http://dx.doi.org/10.1079/joh2002132.

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AbstractBetween November 1998 and October 2000, freshwater snails were collected monthly from the highveld and lowveld areas of Zimbabwe to determine the occurrence of larval trematodes. A total of 13,789 snails, representing ten species, were collected from 21 sites and 916 (6.6%) harboured patent trematode infections. Eight morphologically distinguishable types of cercariae were identified.Bulinus tropicushad the highest overall prevalence of infection (13.1%). The echinostome was the most common type of cercaria recovered, contributing 38.2% of all infections.Schistosomacercariae were recovered mainly from the highveld and comprised 8.0% of all infections. Amphistome cercariae contributed 37.6% of all infections and were recorded from both the highveld and lowveld areas with a peak prevalence occurring during the post-rainy period (March–May). The main intermediate host for amphistomes wasB. tropicus. Infections inB. globosus,B. forskaliiandBiomphalaria pfeifferiwith amphistome cercariae are new records for Zimbabwe.
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Monadjem, Ara, et April E. Reside. « Breeding Season ofEpomophorus walhbergiin the Lowveld of Swaziland ». African Zoology 47, no 2 (octobre 2012) : 321–25. http://dx.doi.org/10.3377/004.047.0217.

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Monadjem, Ara, et April E. Reside. « Breeding season ofEpomophorus walhbergiin the lowveld of Swaziland ». African Zoology 47, no 2 (avril 2012) : 321–25. http://dx.doi.org/10.1080/15627020.2012.11407552.

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Mason, S. J. « Climatic change over the Lowveld of South Africa ». Climatic Change 32, no 1 (janvier 1996) : 35–54. http://dx.doi.org/10.1007/bf00141277.

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Chamboko, T., A. W. Mukhebi, C. J. O'Callaghan, Trevor F. Peter, R. L. Kruska, G. F. Medley, Suman M. Mahan et B. D. Perry. « La cowdriose et l'économie de la production animale dans les fermes commerciales et traditionnelles au Zimbabwe ». Revue d’élevage et de médecine vétérinaire des pays tropicaux 52, no 3-4 (1 mars 1999) : 313–23. http://dx.doi.org/10.19182/remvt.9680.

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Afin d'évaluer l'impact économique de la cowdriose (infection par Cowdria ruminantium ) et de créer un modèle pour l'impact des vaccins améliorés contre cette maladie, une étude sur le terrain a été conduite pour fournir des données sur les indicateurs de productivité du bétail au Zimbabwe. Des études transversales ont été réalisées dans les deux principales régions agro-écologiques, lowveld et highveld, où la cowdriose est supposée être endémique stable et épidémique, respectivement. Ces études ont été conçues pour fournir des données sur la productivité et la rentabilité du bétail ( des principaux indicateurs de production dans le secteur traditionnel et commercial (pour des entreprises productrices de viande bovine, de lait, d'ovins, de caprins). Les résultats prouvent que la rentabilité des fermes commerciales de viande bovine, comme l'indiquent les marges brutes globalement positives, était identique (p > 0.05), indépendamment de la présence et de la localisation de la cowdriose. Seules les fermes laitières commerciales qui ont enregistré des cas de cowdriose ont montré une marge brute négative, bien que ce ne soit pas sensiblement différent des exploitations laitières qui n'ont pas enregistré de cowdriose ou des fermes de viande bovine. Le secteur traditionnel dans les highveld et lowveld a affiché des marges brutes positives, bien que la marge ait été significativement (p < 0.001) plus élevée dans le highveld que dans le lowveld. Cette étude indique que les pertes associées à la cowdriose sont minimales lorsque la maladie est endémique stable ou épidémique avec un contrôle efficace des tiques. De plus, la rentabilité de la production animale, dans les secteurs commercial et traditionnel, pourrait être améliorée si des méthodes plus rentables pour le contrôle des tiques et des maladies transmises par les tiques (qui représentent un des principaux coûts de production) étaient disponibles.
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PETER, T. F., B. D. PERRY, C. J. O'CALLAGHAN, G. F. MEDLEY, G. MLAMBO, A. F. BARBET et S. M. MAHAN. « Prevalence of Cowdria ruminantium infection in Amblyomma hebraeum ticks from heartwater-endemic areas of Zimbabwe ». Epidemiology and Infection 123, no 2 (octobre 1999) : 309–16. http://dx.doi.org/10.1017/s0950268899002861.

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Analysis of the transmission dynamics of Cowdria ruminantium, the tick-borne rickettsial agent of heartwater in ruminants, requires accurate measures of infection in vector populations. To obtain these, Amblyomma hebraeum ticks were collected at two heartwater-endemic locations in the lowveld and highveld regions of Zimbabwe and assessed for C. ruminantium infection with specific polymerase chain reaction (PCR) and DNA probe detection assays. At the lowveld site, 11·2% (50/446) of adult ticks and 8·5% (23/271) of nymphs carried C. ruminantium, as detected by PCR. At the highveld site, the prevalence of infection in adult ticks was 10·2% (40/392). DNA probe analysis revealed that most infections at both sites were of low intensity; only 9% and 23% of all nymph and adult tick infections, respectively, were greater than 70000 organisms, the detection limit of the DNA probe. However, the majority (70%) of probe- detectable adult tick infections were high, between 107 and 109 organisms/tick, while those within nymphs were lower, between 105 and 106 organisms/tick.
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10

Makhado, R. A., M. J. Potgieter et D. C. J. Wessels. « Colophospermum mopane wood utilisation in the Lowveld, Limpopo Province ». South African Journal of Botany 74, no 2 (avril 2008) : 371. http://dx.doi.org/10.1016/j.sajb.2008.01.076.

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11

Traill, Lochran W., et Jolene T. Fisher. « Land cover transformation in the Save‐Limpopo Lowveld, Zimbabwe ». African Journal of Ecology 58, no 3 (25 novembre 2019) : 599–602. http://dx.doi.org/10.1111/aje.12707.

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12

Collier, Bret A., Robert A. McCleery, Kirby W. Calhoun, Kim G. Roques et Ara Monadjem. « Detection Probabilities of Ungulates in the Eastern Swaziland Lowveld ». South African Journal of Wildlife Research 41, no 1 (avril 2011) : 61–67. http://dx.doi.org/10.3957/056.041.0106.

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Niehaus, Isak, et Jonathan Stadler. « Muchongolo Dance Contests : Deep Play in the South African Lowveld ». Ethnology 43, no 4 (1 octobre 2004) : 363. http://dx.doi.org/10.2307/3774033.

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14

Long, Andrea K., Karen Bailey, Daniel U. Greene, Courtney Tye, Courtnee Parr, Heather K. Lepage, Kurt H. Gielow, Ara Monadjem et Robert A. McCleery. « Multi-scale habitat selection ofMus minutoidesin the Lowveld of Swaziland ». African Journal of Ecology 51, no 3 (28 décembre 2012) : 493–500. http://dx.doi.org/10.1111/aje.12062.

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15

Mhiribidi, Delight, Joel Nobert, Webster Gumindoga et Donald T. Rwasoka. « Optimal water resource allocation modelling in the Lowveld of Zimbabwe ». Proceedings of the International Association of Hydrological Sciences 378 (29 mai 2018) : 67–72. http://dx.doi.org/10.5194/piahs-378-67-2018.

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Abstract. The management and allocation of water from multi-reservoir systems is complex and thus requires dynamic modelling systems to achieve optimality. A multi-reservoir system in the Southern Lowveld of Zimbabwe is used for irrigation of sugarcane estates that produce sugar for both local and export consumption. The system is burdened with water allocation problems, made worse by decommissioning of dams. Thus the aim of this research was to develop an operating policy model for the Lowveld multi-reservoir system.The Mann Kendall Trend and Wilcoxon Signed-Rank tests were used to assess the variability of historic monthly rainfall and dam inflows for the period 1899–2015. The WEAP model was set up to evaluate the water allocation system of the catchment and come-up with a reference scenario for the 2015/2016 hydrologic year. Stochastic Dynamic Programming approach was used for optimisation of the multi-reservoirs releases.Results showed no significant trend in the rainfall but a significantly decreasing trend in inflows (p < 0.05). The water allocation model (WEAP) showed significant deficits ( ∼ 40 %) in irrigation water allocation in the reference scenario. The optimal rule curves for all the twelve months for each reservoir were obtained and considered to be a proper guideline for solving multi- reservoir management problems within the catchment. The rule curves are effective tools in guiding decision makers in the release of water without emptying the reservoirs but at the same time satisfying the demands based on the inflow, initial storage and end of month storage.
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Niehaus, Isak. « Averting danger : taboos and bodily substances in the South African lowveld ». Critical African Studies 5, no 3 (octobre 2013) : 127–39. http://dx.doi.org/10.1080/21681392.2013.837352.

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Niehaus, Isak. « Death before Dying : Understanding AIDS Stigma in the South African Lowveld ». Journal of Southern African Studies 33, no 4 (28 novembre 2007) : 845–60. http://dx.doi.org/10.1080/03057070701646944.

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18

Evers, T. M., et N. J. Van Der Merwe. « Iron Age Ceramics from Phalaborwa North Eastern Transvaal Lowveld, South Africa ». South African Archaeological Bulletin 42, no 146 (décembre 1987) : 87. http://dx.doi.org/10.2307/3888735.

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19

Miller, Duncan, David Killick et Nikolaas J. van der Merwe. « Metal Working in the Northern Lowveld, South Africa A.D. 1000–1890 ». Journal of Field Archaeology 28, no 3-4 (janvier 2001) : 401–17. http://dx.doi.org/10.1179/jfa.2001.28.3-4.401.

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Keyes, CA, J. Myburgh et D. Brits. « Animal scavenging on pig cadavers in the Lowveld of South Africa ». Forensic Science International 327 (octobre 2021) : 110969. http://dx.doi.org/10.1016/j.forsciint.2021.110969.

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Niehaus, Isak. « Bodies, Heat, and Taboos : Conceptualizing Modern Personhood in the South African Lowveld ». Ethnology 41, no 3 (2002) : 189. http://dx.doi.org/10.2307/4153025.

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22

Kruger, F. J. « Enzyme polymorphism in Schistosoma mattheei from cattle in the Eastern Transvaal Lowveld ». Journal of Helminthology 63, no 3 (septembre 1989) : 191–96. http://dx.doi.org/10.1017/s0022149x0000897x.

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ABSTRACTEnzyme electrophoresis was conducted on 10 Schistosoma mattheei adult worm samples, comprising 270 individuals, collected from cattle in the Eastern Transvaal Lowveld. Glucose-6-phosphate dehydrogenase (G6PDH) was studied in all the samples and phosphoglucomutase (PGM) and malate dehydrogenase (MDH) in five populations each. Only one population was polymorphic for G6PDH. In this population, in addition to the allele found in all the other samples, a second allele occurred with a similar Rf value to S. haematobium. The two alleles were in Hardy-Weinberg equilibrium. MDH-1 exhibited two alleles. However, these alleles were not in equilibrium. In certain populations, heterozygotes occurred together with homozygotes of one of the alleles only. PGM was monomorphic in all the populations studied.
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Shackleton, Charlie M. « Growth patterns of Pterocarpus angolensis in savannas of the South African lowveld ». Forest Ecology and Management 166, no 1-3 (août 2002) : 85–97. http://dx.doi.org/10.1016/s0378-1127(01)00676-4.

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Scoones, I., J. Chaumba, B. Mavedzenge et W. Wolmer. « The new politics of Zimbabwe's lowveld : Struggles over land at the margins ». African Affairs 111, no 445 (4 septembre 2012) : 527–50. http://dx.doi.org/10.1093/afraf/ads057.

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BOTHA, J., E. T. F. WITKOWSKI et C. M. SHACKLETON. « Market profiles and trade in medicinal plants in the Lowveld, South Africa ». Environmental Conservation 31, no 1 (mars 2004) : 38–46. http://dx.doi.org/10.1017/s0376892904001067.

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Rising demand for medicinal plants has led to increased pressure on wild plant populations. This, combined with shrinking habitats, means that many species in South Africa are now facing local extinction. In 1997, a study was initiated to determine the extent of trade in medicinal plants in the South African Lowveld (the low lying plains to the east of the Drakensberg escarpment), and to investigate socio-economic factors influencing trade and resource management. Trade was not as extensive in the Lowveld as in major urban markets such as Durban or the Witwatersrand (Johannesburg and surrounding towns), either in terms of the quantity, number or range of species sold, or the numbers of people relying on the trade for an income. In markets assessed in Mpumalanga Province, 176 species were identified (71% of the vernacular names encountered in the market place), representing 69 plant families. In Limpopo, 70 different species were identified (84% of the vernacular names encountered in the market place), representing 40 families. Imports were significant in Mpumalanga (33% of the plants on offer), mainly from Mozambique. A detrended correspondence analysis showed substantial differences between species traded in Mpumalanga and those sold in Limpopo. There was little variation in the species stocked by vendors in Mpumalanga, regardless of the season, the attributes of the seller, or whether business was carried out in urban or rural areas. In contrast, there was considerable variation in the stock inventories of the Limpopo traders. Despite the lower levels of local trade, increased harvesting pressure is being experienced regionally, to meet demand in metropolitan centres such as the Witwatersrand. This study showed considerable local variation and complexities in the harvesting and marketing of medicinal plants, with both a national and an international dimension. This dual spatial scale presents both opportunities and challenges in the management of these plants, which need to be addressed simultaneously, particularly with respect to research requirements and development of predictive models and capacity. Cooperation in conservation strategies and policies is required at regional, national and international levels, while ensuring that management initiatives take into account local market conditions and the socio-economic realities facing both consumers and those who depend on the trade for their livelihoods.
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Botha, Jenny, ED T. F. Witkowski et Charlie M. Shackleton. « Factors influencing prices of medicinal plants traded in the Lowveld, South Africa ». International Journal of Sustainable Development & ; World Ecology 14, no 5 (octobre 2007) : 450–69. http://dx.doi.org/10.1080/13504500709469745.

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van der Waal, Kees (C S. ). « Multiple livelihoods and social relations in the South African Lowveld, 1986–2013 ». Review of African Political Economy 44, no 152 (3 avril 2017) : 220–36. http://dx.doi.org/10.1080/03056244.2017.1313727.

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Grout, T. G., et E. A. Ueckermann. « Predatory mites (Acari) found under citrus trees in the Southern African lowveld ». International Journal of Acarology 25, no 3 (septembre 1999) : 235–38. http://dx.doi.org/10.1080/01647959908684158.

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Samways, M. J. « Relationship between red scale, Aonidiella aurantii (Maskell) (Hemiptera : Diaspididae), and its natural enemies in the upper and lower parts of citrus trees in South Africa ». Bulletin of Entomological Research 75, no 3 (septembre 1985) : 379–93. http://dx.doi.org/10.1017/s0007485300014498.

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AbstractIn mature Valencia orange trees at three sites in the Transvaal lowveld, there was a variable differential between levels of Aonidiella aurantii (Maskell) in the upper and lower parts of the trees. At one site there were high scale levels in the crowns of the trees as a result of past poor chemical spray procedure. In recent years, pest management has maximized on the use of natural enemies, especially Aphytis spp. However, the natural enemies have not been able to ameliorate the crown problem. At generally high levels of Aonidiella aurantii, the natural enemies were ableonly, more or less, to maintain the average overall level of the scale from one year to the next; they could not bring it down. This arose each year from too many scales escaping parasitism and reaching the relatively invincible adult stage early in the season. As the behaviour of the parasitoids was inversely density-dependent at these relatively high scale levels, this led to a greater increase in scale numbers, leading eventually to up to 90% of the population (excluding crawlers) being composed of adult females. The inverse density dependence was also partly because the majority of single scales escaped parasitoid attack. In the lowveld, it is a prerequisite that the density of A. aurantii first be lowered by an introduced natural enemy (e.g. the coccinellid Chilocorus nigritus (F.)) that attacks the adult stage and&sol; or by chemical means before maximal use is made of the regulatory influence of the existing natural enemies, particularly Aphytis spp.
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Lindsey, P. A., S. S. Romañach, S. Matema, C. Matema, I. Mupamhadzi et J. Muvengwi. « Dynamics and underlying causes of illegal bushmeat trade in Zimbabwe ». Oryx 45, no 1 (janvier 2011) : 84–95. http://dx.doi.org/10.1017/s0030605310001274.

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AbstractThe prevalence and impacts of the illegal trade in bushmeat are under appreciated in Southern Africa, despite indications that it constitutes a serious conservation threat in parts of the region. Bushmeat trade has emerged as a severe threat to wildlife conservation and the viability of wildlife-based land uses in Zimbabwe during a period of political instability and severe economic decline. We conducted a study around Savé Valley Conservancy in the South-East Lowveld of Zimbabwe to investigate the dynamics and underlying causes of the bushmeat trade, with the objective of developing solutions. We found that bushmeat hunting is conducted mainly by unemployed young men to generate cash income, used mostly to purchase food. Bushmeat is mainly sold to people with cash incomes in adjacent communal lands and population centres and is popular by virtue of its affordability and availability. Key drivers of the bushmeat trade in the South-East Lowveld include: poverty, unemployment and food shortages, settlement of wildlife areas by impoverished communities that provided open access to wildlife resources, failure to provide stakes for communities in wildlife-based land uses, absence of affordable protein sources other than illegally sourced bushmeat, inadequate investment in anti-poaching in areas remaining under wildlife management, and weak penal systems that do not provide sufficient deterrents to illegal bushmeat hunters. Each of these underlying causes needs to be addressed for the bushmeat trade to be tackled effectively. However, in the absence of political and economic stability, controlling illegal bushmeat hunting will remain extremely difficult and the future of wildlife-based land uses will remain bleak.
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Mather, Charles. « The Anatomy of a Rural Strike : Power and Space in the Transvaal Lowveld ». Canadian Journal of African Studies / Revue Canadienne des Études Africaines 27, no 3 (1993) : 424. http://dx.doi.org/10.2307/485693.

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Peel, Mike JS, et Izak P. Smit. « Drought amnesia : lessons from protected areas in the eastern Lowveld of South Africa ». African Journal of Range & ; Forage Science 37, no 1 (2 janvier 2020) : 81–92. http://dx.doi.org/10.2989/10220119.2020.1720292.

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Niehaus, Isak. « WITCHES AND ZOMBIES OF THE SOUTH AFRICAN LOWVELD : DISCOURSE, ACCUSATIONS AND SUBJECTIVE REALITY ». Journal of the Royal Anthropological Institute 11, no 2 (juin 2005) : 191–210. http://dx.doi.org/10.1111/j.1467-9655.2005.00232.x.

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Mather, Charles. « The Anatomy of a Rural Strike : Power and Space in the Transvaal Lowveld ». Canadian Journal of African Studies / Revue canadienne des études africaines 27, no 3 (janvier 1993) : 424–38. http://dx.doi.org/10.1080/00083968.1993.10804329.

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van der Merwe, M., et I. L. Rautenbach. « Reproduction in Schlieffen's bat, Nycticeius schlieffenii, in the eastern Transvaal lowveld, South Africa ». Reproduction 81, no 1 (1 septembre 1987) : 41–50. http://dx.doi.org/10.1530/jrf.0.0810041.

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Meikle, S., et J. Heine. « A Fire Danger Index System for the Transvaal Lowveld and Adjoining Escarpment Areas ». South African Forestry Journal 143, no 1 (décembre 1987) : 55–56. http://dx.doi.org/10.1080/00382167.1987.9630304.

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DE VILLIERS, P. A., et O. B. KOK. « Home range, association and related aspects of elephants in the eastern Transvaal Lowveld ». African Journal of Ecology 35, no 3 (septembre 1997) : 224–36. http://dx.doi.org/10.1111/j.1365-2028.1997.079-89079.x.

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Mather, Charles. « Foreign Migrants in Export Agriculture : Mozambican Labour in the Mpumalanga Lowveld, South Africa ». Tijdschrift voor economische en sociale geografie 91, no 4 (novembre 2000) : 426–36. http://dx.doi.org/10.1111/1467-9663.00128.

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Dalu, Tatenda, Edwin Munyaradzi Tambara, Bruce Clegg, Lenin Dzibakwe Chari et Tamuka Nhiwatiwa. « Modeling sedimentation rates of Malilangwe reservoir in the south-eastern lowveld of Zimbabwe ». Applied Water Science 3, no 1 (28 décembre 2012) : 133–44. http://dx.doi.org/10.1007/s13201-012-0067-9.

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Wolmer, William. « Wilderness gained, wilderness lost : wildlife management and land occupations in Zimbabwe's southeast lowveld ». Journal of Historical Geography 31, no 2 (avril 2005) : 260–80. http://dx.doi.org/10.1016/j.jhg.2004.12.022.

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Niehaus, Isak. « Gendered Endings : Narratives of Male and Female Suicides in the South African Lowveld ». Culture, Medicine, and Psychiatry 36, no 2 (23 mars 2012) : 327–47. http://dx.doi.org/10.1007/s11013-012-9258-y.

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Niehaus, Isak. « Witches of the Transvaal Lowveld and their Familiars. Conceptions of Duality, Power and Desire ». Cahiers d’études africaines 35, no 138 (1995) : 513–40. http://dx.doi.org/10.3406/cea.1995.1458.

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De Lemos, Hugo, Michel M. Verstraete et Mary Scholes. « Parametric Models to Characterize the Phenology of the Lowveld Savanna at Skukuza, South Africa ». Remote Sensing 12, no 23 (30 novembre 2020) : 3927. http://dx.doi.org/10.3390/rs12233927.

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Mathematical models, such as the logistic curve, have been extensively used to model the temporal evolution of biological processes, though other similarly shaped functions could be (and sometimes have been) used for this purpose. Most previous studies focused on agricultural regions in the Northern Hemisphere and were based on the Normalized Difference Vegetation Index (NDVI). This paper compares the capacity of four parametric double S-shaped models (Gaussian, Hyperbolic Tangent, Logistic, and Sine) to represent the seasonal phenology of an unmanaged, protected savanna biome in South Africa’s Lowveld, using the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) generated by the Multi-angle Imaging SpectroRadiometer-High Resolution (MISR-HR) processing system on the basis of data originally collected by National Aeronautics and Space Administration (NASA)’s Multi-angle Imaging SpectroRadiometer (MISR) instrument since 24 February 2000. FAPAR time series are automatically split into successive vegetative seasons, and the models are inverted against those irregularly spaced data to provide a description of the seasonal fluctuations despite the presence of noise and missing values. The performance of these models is assessed by quantifying their ability to account for the variability of remote sensing data and to evaluate the Gross Primary Productivity (GPP) of vegetation, as well as by evaluating their numerical efficiency. Simulated results retrieved from remote sensing are compared to GPP estimates derived from field measurements acquired at Skukuza’s flux tower in the Kruger National Park, which has also been operational since 2000. Preliminary results indicate that (1) all four models considered can be adjusted to fit an FAPAR time series when the temporal distribution of the data is sufficiently dense in both the growing and the senescence phases of the vegetative season, (2) the Gaussian and especially the Sine models are more sensitive than the Hyperbolic Tangent and Logistic to the temporal distribution of FAPAR values during the vegetative season, and, in particular, to the presence of long temporal gaps in the observational data, and (3) the performance of these models to simulate the phenology of plants is generally quite sensitive to the presence of unexpectedly low FAPAR values during the peak period of activity and to the presence of long gaps in the observational data. Consequently, efforts to screen out outliers and to minimize those gaps, especially during the rainy season (vegetation’s growth phase), would go a long way to improve the capacity of the models to adequately account for the evolution of the canopy cover and to better assess the relation between FAPAR and GPP.
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Sadiki, T., et M. P. Tshisikhawe. « Population ecology of Pterocarpus angolensis DC. at the Lowveld National Botanical Gardens, Mpumalanga Province ». South African Journal of Botany 109 (mars 2017) : 368. http://dx.doi.org/10.1016/j.sajb.2017.01.174.

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Niehaus, Isak. « Maternal Incest as Moral Panic : Envisioning Futures without Fathers in the South African Lowveld ». Journal of Southern African Studies 36, no 4 (décembre 2010) : 833–49. http://dx.doi.org/10.1080/03057070.2010.527640.

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Niehaus, Isak. « Seeing Through Dreams : On the Efficacy of Antiretroviral Drugs in the South African Lowveld ». Journal of Southern African Studies 45, no 1 (2 janvier 2019) : 197–213. http://dx.doi.org/10.1080/03057070.2019.1561810.

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Stadler, Jonathan. « Rumor, Gossip and Blame : Implications for HIV/AIDS Prevention in The South African Lowveld ». AIDS Education and Prevention 15, no 4 (août 2003) : 357–68. http://dx.doi.org/10.1521/aeap.15.5.357.23823.

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Niehaus, Isak. « Ethnicity and the boundaries of belonging : reconfiguring Shangaan identity in the South African lowveld ». African Affairs 101, no 405 (1 octobre 2002) : 557–83. http://dx.doi.org/10.1093/afraf/101.405.557.

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Dalu, T., BW Clegg et T. Nhiwatiwa. « A study of the ichthyofauna of a small tropical reservoir, south-eastern lowveld, Zimbabwe ». African Journal of Aquatic Science 38, sup1 (29 novembre 2013) : 105–13. http://dx.doi.org/10.2989/16085914.2013.768953.

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Niehaus, Isak. « PERVERSION OF POWER : WITCHCRAFT AND THE SEXUALITY OF EVIL IN THE SOUTH AFRICAN LOWVELD ». Journal of Religion in Africa 32, no 3 (2002) : 269–99. http://dx.doi.org/10.1163/157006602760599926.

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AbstractDuring recent years, fears of witchcraft and the violent punishment of witches have become commonplace in the Bushbuckridge region of the South African lowveld. My fieldwork in a village of Bushbuckridge highlights the crucial importance of sexuality in witchcraft discourses. Narratives about the sexual practices of witches formed part of the same moral system as those about the unacceptable sexual conduct of ordinary villagers. But there were also important differences between these. Whilst the unacceptable sexual conduct of ordinary villagers transgressed general moral ideals, the sexual practices of witches transgressed local hierarchies of domination and were conceptualised as perversions of power. I suggest that the most appropriate perspective on witchcraft is one that seeks to integrate a concern with broader political economic processes with a rigorous analysis of the micro-politics of sexuality, kinship and morality.
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