Resprouters Versus Reseeders: Are Wild Rooibos Ecotypes Genetically Distinct?

Aspalathus linearis (Burm. F.) R. Dahlgren (Fabaceae) or rooibos, is a strict endemic species, limited to areas of the Cederberg (Western Cape) and the southern Bokkeveld plateau (Northern Cape) in the greater Cape Floristic Region (CFR) of South Africa. Wild rooibos, unlike the cultivated type, is variable in morphology, biochemistry, ecology and genetics, and these ecotypes are broadly distinguished into two main groups, namely, reseeders and resprouters, based on their fire-survival strategy. No previous assessment of genetic diversity or population structure using microsatellite markers has been conducted in A. linearis. This study aimed to test the hypothesis that wild rooibos ecotypes are distinct in genetic variability and that the ecotypes found in the Northern Cape are differentiated from those in the Cederberg that may be linked to a fire-survival strategy as well as distinct morphological and phytochemical differences. A phylogeographical and population genetic analyses of both chloroplast (trnLF intergenic region) and newly developed species-specific nuclear markers (microsatellites) was performed on six geographically representative wild rooibos populations. From the diversity indices, it was evident that the wild rooibos populations have low-to-moderate genetic diversity (He: 0.618–0.723; Ho: 0.528–0.704). The Jamaka population (Cederberg, Western Cape) had the lowest haplotype diversity (H = 0.286), and the lowest nucleotide diversity (π = 0.006) even though the data revealed large variations in haplotype diversity (h = 0.286–0.900) and nucleotide diversity (π = 0.006–0.025) between populations and amongst regions where wild rooibos populations are found. Our data suggests that populations of rooibos become less diverse from the Melkkraal population (Suid Bokkeveld, Northern Cape) down towards the Cederberg (Western Cape) populations, possibly indicative of clinal variation. The largest genetic differentiation was between Heuningvlei (Cederberg, Western Cape) and Jamaka (FST = 0.101) localities within the Cederberg mountainous region, and, Blomfontein (Northern Cape) and Jamaka (Cederberg) (FST = 0.101). There was also a significant isolation by distance (R2 = 0.296, p = 0.044). The presence of three main clusters is also clearly reflected in the discriminant analysis of principal components (DAPC) based on the microsatellite marker analyses. The correct and appropriate management of wild genetic resources of the species is urgently needed, considering that the wild Cederberg populations are genetically distinct from the wild Northern Cape plants and are delineated in accordance with ecological functional traits of reseeding or resprouting, respectively. The haplotype divergence of the ecotypes has also provided insights into the genetic history of these populations and highlighted the need for the establishment of appropriate conservation strategies for the protection of wild ecotypes.

International procurement policies influencing renewable energy siting – implications for South Africa

The South African Renewable Independent Power Producer Procurement Programme selects bid winners based on bid tariff (70% weighting) and various economic development criteria (30% weighting). Locating renewable energy (RE) projects in areas with better resources increases their cost competitiveness. As a result, most successful bids for wind and solar photovoltaic (PV) systems to date have been concentrated in the Eastern Cape and Northern Cape provinces, respectively. Studies have shown that a wider geographic distribution of wind and solar PV projects mitigates the impacts of the variability of wind and solar PV resources, eases grid congestion and generally improves the power system’s operation. This paper conducts a literature review to investigate the procurement methods used in different regions of the world to influence the placement of RE plants, the results of which then inform proposals on adjustments to the current REI4P. The study finds that, after congestion incidents due to concentration of RE plants, some regions implement location-based tariff, where high-resource areas receive the lowest tariff and vice versa. Other regions prioritise on building transmission infrastructure in high-resource areas, while others limit the size of RE installations in one area. Given the current generation and transmission constraints in South Africa, it is important to encourage geographical dispersion of RE plants and avoid RE curtailment, since this can escalate the cost of RE integration significantly.

The effect of the food insecurities in farming and non-farming households: lesson learnt from households in the Francis Baard district municipality, Northern Cape Province of South Africa

The purpose of this study was to determine the effect of food insecurity in farming and non-farming households in the Francis Baard District Municipality. The research approach used in this study was quantitative. By using a cross-sectional survey, data was collected referring to the population of interest. A simple random sample comprising of 516 respondents from farming and non-farming households in the Frances Baard Municipality was selected. The data were analysed using multiple logistic regression (MLR) models. The results revealed that food shortages are more likely (B = 0.22, p = 0.01) to cause severe food insecurities in farming households when access to food gardens and smallholding is constant. On the other hand, non-farming households could also be affected by severe food insecurity due to food shortages (B = 0.29, p = 0.04) and lack of access to smallholding farming areas. The results further showed that food gardening is highly likely to reduce severe food insecurity. The results imply that the municipality has to provide access to food gardening facilities and smallholder plots for non-farming and farming households to combat severe food insecurity and promote food security. The policy on comprehensive producer support only recognises the support for the farmers' different categories than the households. Therefore, it is recommended that the policymakers amend this policy to enable the household to be empowered as beneficiaries.

Tabanidae (Diptera) holotypes in the KwaZulu-Natal Museum collection: Part 1. Haematopota Meigen, 1803

All primary (name-bearing) types of Haematopota Meigen, 1803, deposited in the KwaZulu-Natal Museum (NMSA) are documented - Haematopota anomala Travassos Dias, 1956 (Mpumalanga, South Africa); Haematopota diasi Travassos Dias, 1956 (Gauteng, South Africa); Haematopota megaera Usher, 1965 (Eastern Cape, South Africa); Haematopota mephista Usher, 1965 (KwaZulu-Natal, South Africa); Haematopota montisdraconis Usher, 1965 (Eastern Cape, South Africa); Haematopota ovazzai Travassos Dias, 1956 (Eastern Cape, South Africa); Haematopota quathlambia Usher, 1965 (KwaZulu-Natal, South Africa); Haematopota spectabilis Oldroyd, 1952 (Northern Cape, South Africa); Haematopota tropai Travassos Dias, 1956 (Reunion). The reference to the original publication, including the original name, the type locality and the collector, is provided for each species. In addition, brief remarks and colour photographs are provided. This is the first in a series of publications on the primary types of the Tabanidae of the KwaZulu-Natal Museum.

Strategy implementation in South African public entities between 2006 and 2016: Does leadership impact on performance during strategy implementation?

Background: Those in leadership must always envision endless possibilities even in the event of what appear to be insurmountable problems. Leadership exists to solve problems in any given context. Leadership is a determinant of value creation and sustainable competitive advantage through superior organisational performance in any organisation. Yet, pervasive leadership challenges are prevalent in the South African public entities, and not a lot of research has been done in this area. Hence, this research was an attempt to determine the influence of leadership on organisational performance during strategy implementation in the Northern Cape based public entities.Aim: To empirically investigate the relationship between leadership and organisational performance during strategy implementation in the Northern Cape provincial public entities in South Africa.Setting: Public entities in the Northern Cape province with regards to relationships amongst financial and human resources, poor organisational culture, leadership, organisational performance, as well as service delivery.Method: A survey design and mixed methods were applied in this study. A survey questionnaire was used to collect quantitative data from a simple random sample of 38 executives of the public entities and government departments in the Northern Cape province. The response rate was 78%. The t-test, correlational analysis, multiple regression analysis were performed. These were complemented by content analysis of government’s strategic documents.Results: It was found that unqualified leadership and insufficient financial and human resources affect strategy implementations and organisational performance negatively. Most entities have problems with leadership capacity, which creates strategy implementation challenges. Weak Boards in some entities translate into weak leadership because there is no direction in the entities.Conclusion: Unqualified leadership affect organisational performance negatively. This implies that the public sector entities might fail to fulfil their mandate to serve the public. Recommendations are made to minimise the challenges of leadership in the South African public entities to increase organisational performance. When appointing Board members, the quality of the members in terms of qualifications should be considered. Board members, apart from having competence and requisite skills to execute the mandate in the entity, should also be visionary and dedicated to the province. They should provide ethical leadership and corporate governance both at the strategic and governance level. Ethical and honest leadership which is not tainted by corruption (real or perceived) is of critical importance in any organisation and setting.

Case Study in The Northern Cape (Loopeng Area), South Africa, Confirming Occurrence of a Collapsible Soil Structure in Transported Soils

Testing was performed on transported soils belonging to recently deposited sandy-silty soil deposits occurring in the Northern Cape Province, South Africa in order to determine the occurrence and order of magnitude of a collapsing sand soil structure. Various empirical geotechnical characteristics including: in situ soil profile structure description, particle grading curve and clay content, soil classification, soil density and void ratio were compared to collapse potential values determined with oedometer testing in order to judge the success with which the empirical characteristics can be utilized to predict the occurrence of a collapsible soil structure.From the results it is clear that a collapsing sand structure exists in the transported soils and the empirical descriptors mostly correctly indicate the occurrence or the particular soil structure when compared to previous studies on collapsing sands. The one descriptor which reflects a relatively poor correction between the descriptor and the soil structure (in situ soil profile structure description) is considered to be a poor indicator of the collapsible soil structure due to erroneous or poor in situ soil structure observations resulting from unfavourable local conditions namely dry, dusty soil conditions and very brief intact standup time of test pit side walls.

Multiproxy Holocene Fire Records From the Tropical Savannas of Northern Cape York Peninsula, Queensland, Australia

Paleoecology has demonstrated potential to inform current and future land management by providing long-term baselines for fire regimes, over thousands of years covering past periods of lower/higher rainfall and temperatures. To extend this potential, more work is required for methodological innovation able to generate nuanced, relevant and clearly interpretable results. This paper presents records from Cape York Peninsula, Queensland, Australia, as a case study where fire management is an important but socially complex modern management issue, and where palaeofire records are limited. Two new multiproxy palaeofire records are presented from Sanamere Lagoon (8,150–6,600 cal BP) and Big Willum Swamp (3,900 cal BP to present). These records combine existing methods to investigate fire occurrence, vegetation types, and relative fire intensity. Results presented here demonstrate a diversity of fire histories at different sites across Cape York Peninsula, highlighting the need for finer scale palaeofire research. Future fire management planning on Cape York Peninsula must take into account the thousands of years of active Indigenous management and this understanding can be further informed by paleoecological research.