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Shifting from Development to Empowerment Through Eco-Creative Knowledge Transmission
No full textConventional definitions of development can be linked to socio-economic and cultural impositions of the Global North on developing societies. These development frameworks were inherited from the colonial system, which devalued local ways of knowing, being, and developing and continues to do so. Through a transdisciplinary or Boundary Crossing environmental case study that interrogates the use of heritage skills and knowledge for nature-based solutions relating to coastal shore regeneration, this chapter reflects on experiences of knowledge co-creation in the rural Eastern Cape Province setting of South Africa. Through the lens of African Musical Arts, which includes song and dance, storytelling, heritage skills, soundscapes, and more, this research seeks to shift the project perceptions of the scientists, engaged scholars, pracademics, practitioners and community researchers involved, from simple to multi-dimensional viewpoints. Using Traditional Cultural Expressions (TCEs) as catalysts, our goal is to emancipate transmission of knowledge from a developmental to an empowerment framework. Using the diverse disciplinary backgrounds of the authors, this chapter allows for a holistic examination of the development of an Audio Postcards exhibition, while interrogating the project centred on African theories, ecologies, and knowledge development
Bioprospecting for entomopathogenic fungi against a foliar citrus pest
Full text linkHistorically, pest management was highly dependent on the use of chemical insecticides for the control of agriculturally important pests. However, more recently, key export markets have imposed stringent chemical residue restrictions for citrus export. This deterring factor for chemical use has been coupled with the fact that these economically important pests are experiencing insecticidal resistance. As a result, the use of entomopathogenic fungi (EPF) has been explored as a complementary control option in integrated pest management (IPM) regimes. Previous research in South Africa identified several strains of Beauveria bassiana and Metarhizium spp. (including isolate M. pinghaense FCM Ar 23 B3). Laboratory bioassays evaluating the virulence of these isolates against major pests such as the false codling moth (FCM) (Thaumatotibia leucotreta, Lepidoptera: Tortricidae), citrus thrips (Scirtothrips aurantii, Thysanoptera: Thripidae), and citrus mealybugs (Planococcus citri, Hemiptera: Pseudococcidae) highlighted the potential of these EPF. While field trials targeting FCM with soil-applied treatments yielded encouraging results, foliar applications aimed at controlling citrus thrips and mealybugs showed limited success. These findings highlighted the need to assess the biological traits of the recovered isolates. Varying temperature ranges and humidity levels were found to not hinder the isolates' efficacy in the field. Conidial inactivation induced by ultraviolet (UV) radiation however, was. As these strains were recovered from the soil environment, it stood to reason that EPF isolates recovered from the foliar environment may be more suited for foliar application. Thus, bioprospecting for isolates from the aboveground environment was initiated and was the focal point of this thesis. Following the isolation and identification, the pathogenic ability and virulence, as well as the UV tolerance of these novel strains were established. Of the isolates recovered from the aboveground environment and identified using morphological and molecular techniques, four were B. bassiana (Px LM 4, Ha LM 11, Ha LM 12, Coe 18), one M. anisopliae (Hu LM 14), one Fusarium oxysporum (Pc HV 9), and one Geotrichum candidum yeast (Ha LM 2). The majority were isolated from insect cadavers, but one (Coe 18) was isolated as a foliar endophyte from an organically managed citrus farm in the Eastern Cape. Using standard protocols and conidial doses, the virulence of the recovered isolates was established against a common foliar pest of citrus, citrus mealybug. Isolate FCM Ar 23 B3 was included as a comparative control in this study as the virulence against citrus mealybug has previously been established. The initial screening of the isolates ranged between 15 and 90 % mortality. Isolates Px LM 4 and FCM Ar 23 B3 both induced an average mortality of 90 %. Isolates Ha LM 11, Ha LM 12, Hu LM 14, and Coe 18 caused mortalities greater than 60 % and were further investigated under dose-response assays. Of the six isolates measured for LC50, FCM Ar 23 B3 was the most virulent (5.25 × 105 conidia/ml), followed by Px LM 4 (1.09 × 106 conidia/ml) and Hu LM 14 (1.32 × 106 conidia/ml). The UV susceptibility to simulated sunlight of the six most virulent isolates was investigated. Whilst UV radiation certainly delayed the conidial germination of all the isolates, all the strains isolated from the aboveground environment demonstrated significant initial tolerance to UV radiation compared to the most virulent M. pinghaense FCM Ar 23 B3, which was recovered from the soil environment. Even though the B. bassiana Coe 18, which was recovered as an endophytic EPF, was not the most virulent, it stood out with strong initial UV tolerance and sustained a relatively high germination rate over time, establishing it as the most UV-tolerant isolate. Although formulation for development as a microbial biocontrol programme should not be overlooked for these isolates, the initial UV and sustained tolerance demonstrated by these aboveground isolates warrants further investigation under field conditions.Thesis (MSc) -- Faculty of Science, Zoology and Entomology, 202
Listening otherwise in the face of gender-based violence in South Africa: a critical exploration of the listening deficiencies in public narratives and a listening-based framework for healing and social change
Full text linkSouth Africa has one of the highest rates of gender-based violence (GBV) in the world. This includes femicide, rape and intimate partner violence. Scholars and activists in the space of GBV have challenged society to alter the way we have been taught to engage with rape and gender-based violence. Despite many interventions, gender-based violence remains an intractable social problem. This study uses Lipari’s (2014) concept of “listening otherwise” to respond to the challenge. By interrogating how South Africa’s violent history and patriarchal society has been normalised, the study attempts to see beyond the narrow ideas prescribed by the country’s history and violent cultures. This study uses the grounded theory approach (Glaser & Strauss 1967) to investigate the relationship between listening and gender-based violence in South Africa. The concept of “listening otherwise” is explored alongside the concepts “voice”, “speak out” and “break the silence” that are the most visible and codified strategies in the fight against gender-based violence. Following the exploration, the study then develops a theoretical and methodological framework for “listening otherwise” in the spaces, fields, and engagements that deal with gender-based violence in South Africa. The two central questions of the study ask; how do we reshape the collective emotional response to patriarchal structural violence? And furthermore, how do we listen otherwise when faced with experiences of gender-based violence in South Africa? The data used to construct the framework includes in-depth interviews, studies of actual cases, academic literature, news interviews and newspaper articles. There are a multitude of ways in which people are talking about gender-based violence, exposing perpetrators and “breaking the silence”. There is, in fact, no silence around rape, gender-based violence and femicide. The silence exists around engagements about gender, misogyny and patriarchy when discussing the causes of gendered violence in the country. This research found that the public’s listening practices around gender-based violence are shaped by patriarchal cultures and rape myths which are endemic in media discourses, legal discourses and in general social talk. Building a caring society, in which people play and use restorative justice practices, may alter the communal listening practices and have an impact on the public response to gender-based violence. The framework for listening otherwise, that emerged as a result of the research, is a contribution to listening scholarship and the activism against gender-based violence. The framework considered various aspects of listening and the field of gender-based violence and arrived at six conceptual considerations and six actions for listening otherwise.Thesis (PhD) -- Faculty of Humanities, Journalism and Media Studies, 202
A critical microethnographic investigation of anomalies in a grade 4 reading comprehension activity
Full text linkAccess restricted. Expected release date in 2027.Thesis (PhD) -- Faculty of Humanities, Linguistics and Applied Language Studies, 202
The taxed informal economy: Fiscal burdens and inequality in Accras
No full textThe common assumption that informal economies are untaxed has underpinned arguments that they represent an ‘untapped goldmine’ for government coffers. However, there has been limited empirical engagement with this assumption. While some studies have highlighted that many informal businesses pay both formal and informal taxes, there has been little systematic accounting of these payments. Using a novel dataset of 2,700 informal enterprises in the Accra metropolitan area in Ghana, this article presents the first geographically representative account of the nature, distribution and impact of taxation in an urban informal sector. We find that the majority of informal sector operators in this context pay a range of taxes and fees, which together amount to a significant burden, especially for low earners. Two key findings emerge in relation to the structure of these taxes. First, the incidence and burden of tax payments is highly uneven and strongly correlated with visibility to the state, suggesting that taxation is driven more by patterns of state enforcement than the choices of informal operators. Second, taxes and fees are highly regressive, with lower-earning operators paying significantly more in relation to their earnings. These findings have important implications for both our conception of informal businesses and efforts to tax informal businesses in low- and middle-income countries
Students’ changing accounts of chemical engineering: a longitudinal study in three countries
Full text linkIn this article we examine how students’ accounts of chemical engineering change during their undergraduate degrees and whether these changes were related to the educational intentions of their degree programs in two English, two South African and two US universities. Based on interviews with forty-five students over the course of their undergraduate chemical engineering degree, we found that initially most students did not know what chemical engineering was or thought it was about undertaking chemistry on a large scale. By the end of their degrees, most students had reached a watershed account of chemical engineering and saw it as about the design of large-scale processes of production. The changes in students’ accounts of chemical engineering appeared to be related to the educational intentions of their degree programs. We explore the implications of these outcomes for curriculum development in chemical engineering
An analysis of the impact of financialisation on commodity futures and spot prices
No full textThe debate on the commodity financialisation phenomenon was triggered in response to the steep rise in commodity futures and spot prices during the 2000-2011 super cycle. The two schools of thought regarding the underlying causes of such dramatic price increases are divided between those attributing the super cycle to fundamental drivers, and those who suggest that fundamental drivers alone are an insufficient explanation, and that other non-fundamental drivers are important. Fundamental drivers commonly cited in the literature include the sustained growth in demand for commodities throughout the early 2000s from emerging economies, such as China and India, and shocks to supply chains such as crop failures, export bans, and other factors such as macroeconomic dynamics. However, an alternative school of thought found empirical evidence which suggested that in addition to fundamental drivers, non-fundamental drivers such as key regulatory changes in commodity and financial markets in 1999/2000, and the subsequent changes to the trading activities in commodity derivative markets and the resultant historic growth in the participation of purely financial investors, significantly impacted the structure and price dynamics in commodity markets, in a phenomenon known as the financialisation of commodity markets. This study contributes to the empirical literature by expanding compared with previous studies the time period under investigation, as well as expanding the range of commodities examined. The most recent 2020-2024 period of rising prices is included, and the behavior of both cross-sector and same-sector pairwise return correlations of futures and spot prices in this period is compared to the pre-financialisation period. The study contributes to the literature by examining how the cross market and cross asset return correlation structure has behaved throughout the entire post-financialisation era. The study makes a further contribution by establishing the statistical significance of futures market returns as a predictor of spot market returns. It is found that the financialisation phenomenon impacted both commodity futures and spot markets. Pairwise return correlation is substantially greater throughout Period 2 (post-financialisation) compared to Period 1 (pre-financialisation) for same-sector and cross-sector pairs of futures and spot prices. The structural change in return correlation between these two periods was found to be especially pronounced for cross-sector pairs of futures and spot prices. The financialisation hypothesis is further supported by the findings of persistent structural changes in cross market and cross asset return correlation, which has become even more pronounced in the later stages of financialisation. The most recent period of rising commodity prices, Period 2(c) (2020-2024), is found to show elevated pairwise return correlation for futures and spot prices levels when compared to Period 1 (pre-financialisation), but the increase in correlations is less than in earlier financialisation periods such as Period 2(a) (2000-2011) and Period 2(b) (2012-2019). These findings suggest that index buying may be less important in the later stages of commodity financialisation. It was found that futures market returns are statistically significant predictors of spot market returns. Furthermore, the causal effect of futures market returns on spot market returns under the effect of financialisation (2000-2024) is found to be statistically significant in all five examples (WTI crude oil, gold, silver, LME copper and aluminium) examined in the study. The study finds that a clear structural change occurred in commodity spot and futures markets in the post-financialisation period. The consistency of this structural change is evident when analysing both cross sector and same sector pairwise return correlation behavior of commodity spot and futures prices, and when analysing cross market and cross asset return correlation between commodity markets and financial market benchmarks. The implication for investors is that commodity markets no longer offer certain portfolio diversification benefits and downside protection to drops in equity markets previously found in the empirical literature, and investors need to recalibrate strategies to account for these structural changes. The study concludes that the commodity market financialisation hypothesis is sound, and this implies that further research is required to better understand the impact of such structural changes on commodity futures and spot markets. In addition, because futures market returns are found to be a statistically significant predictor of spot market returns, it is imperative that further research be undertaken which investigates the explicit relationship between futures and spot markets so that policy makers and market regulators better understand the links between these two markets so that policy decisions are better informed. Furthermore, it is necessary that future research investigates how the transmission of information occurs between futures and spot markets, and how this matters for consumers, and addresses what welfare implications may be associated with this. Lastly, the author has advocated for increased transparency and restrictions in commodity markets, suggesting that all trading occurs on open regulated exchanges and that position limits are implemented, so as to prevent any market distortion which may come from institutional speculators taking excessively powerful and large positions.Thesis (MEcon) -- Faculty of Commerce, Economics and Economic History, 202
The impact of Ghana's entrepreneurial ecosystem on women's entrepreneurial performance: the moderating role of entrepreneurial identity
No full textWomen business leaders are generating a tremendous impact in their markets, industries and communities through innovation, job creation and economic growth. However, their contributions are often lost in the prevailing narrative that women are over-represented among the poorest and most vulnerable entrepreneurs globally. A review of the extant literature has postulated challenges that women entrepreneurs faced several challenges in the ecosystem in which it operates. Women entrepreneurs have access to limited capital as compared to its men counterparts, fewer opportunities to network and build relationships with other entrepreneurs, investors, and mentors, which affects their access to resources and knowledge. Due to the issue of gender-based stereotypes and biases that women entrepreneurs constantly face, they are unable to meet mentors who can provide them with guidance and support to grow their business. These women-specific challenges have become barriers limiting the growth of women entrepreneurs, however insufficient reports highlight how these hindering factors can create opportunities for the growth of women entrepreneurs. Dwelling on the Process theory, the study explored the impact of Ghana’s entrepreneurial ecosystem on women’s entrepreneurial performance with the moderating role of entrepreneurial identity. The study was a cross-sectional quantitative research design with data collected from 413 women entrepreneurs in the Greater Accra Region using structured questionnaire collected using the survey monkey online tool. The data was analyzed using IBM SPSS v.25 and the PLS-SEM v.4.0. The first objective was examined through 12 hypotheses, while the second was analyzed using 2.The study finds that access to finance has positive and insignificant effect on the entrepreneurial performance of women in Ghana. Likewise, education and training have a negative and insignificant effect on the market and operational performance of women entrepreneurs in Ghana. The results of the study postulated that the availability of infrastructure and resources has a negative but significant effect on both the market and operational performance of Ghanaian women entrepreneurs. The results of the study further reported a positive but insignificant impact of network and social capital on the market performance and operational performance of women entrepreneurs in Ghana. The results of the study in relations to the regulatory environment and women entrepreneurial performance indicates an insignificant relationship between regulatory environment and market performance and regulatory performance whilst cultural and social factors within the Ghanaian ecosystem negatively but significantly influence the entrepreneurial performance of women in Ghana but innovation and knowledge spillover have a positive and significant impact on both the market performance and operational performance. Furthermore, the findings of the study suggest that Ghana's entrepreneurial ecosystem may not have a substantial direct impact on women's entrepreneurial performance in Ghana. Further practical and theoretical implications of the study are discussed in the thesis.Thesis (PhD) -- Faculty of Commerce, Rhodes Business School, 202
Investigating the mainstreaming of inclusive education in Teacher Education Practice for Pedagogical Proficiency through Education for Sustainable Development Change Projects in Southern Africa
No full textGlobally, there are policy and practice efforts to mainstream inclusive education in different sub-fields of education. Part of the efforts have focused on investigating and finding practical mechanisms for the mainstreaming process in teacher education. Anecdotally, Education for Sustainable Development (ESD), with its focus on transformative education, collaborative learning, the community of practice and the whole institution approach, has the potential to mainstream inclusive education in teacher education practices if grounded in sociocultural realities rather than mere ideological framing. This situation is related to the need for more transformative capabilities for teacher educators to prepare teachers for inclusive pedagogical proficiency. However, in a southern African context, the outlook of the potential of pedagogical proficiency from the nexus of inclusive education, ESD and teacher education is disjointed. As such, this study focused on investigating the mainstreaming of inclusive education in teacher education practice for pedagogical proficiency through ESD Change Projects in Southern Africa, examining cases from Malawi, Tanzania and Eswatini. The study intended to gain an understanding of inclusive education and ESD in these countries, identify areas for strengthening inclusive education in teacher education practice, collaborate with teacher educators to develop strategies for mainstreaming inclusive education, and generate indicators for monitoring and evaluating inclusive education in teacher education contexts. The study used Urie Bronfenbrenner’s bioecological theory of human development and Lev Vygotsky’s sociocultural theory of learning as theoretical and analytical frameworks. The study also employed Roy Bhaskar’s critical realism philosophy as an underlabourer or a meta-theoretical framework. The study further adapted the Vygotsky-informed Engestrom’s expansive learning as a methodological torch. Together, these frameworks were used to analyse selected Change Projects within Sustainability Starts with Teachers (SST) programme, which focused on ESD capacity building in teacher educators from 11 southern African countries. In this regard, the research utilised a qualitative nested case study design. A formative interventionist research approach supported the cases in Malawi, Tanzania and Eswatini, with the study selecting SST Change Projects dealing with inclusive education through an initial scoping questionnaire. Data were generated through 12 in-depth interviews, nine workshops (involving 24 participants), document reviews, observations and reflective journals. Thematic ii analysis, employing a critical realist approach with abductive and retroductive reasoning, guided the reflexive presentation and discussion of research findings. The research findings revealed a common understanding of inclusive education as providing equal educational opportunities, ESD as supporting sustainable development, and teacher education as skill development. The research findings also highlighted the influence of teacher educators’ biopsychosocial characteristics on their perceptions of inclusive education, ESD and teacher education. Areas requiring improvement in teacher education systems included resources, attitude change, financing, cooperation, collaboration and leadership. Strategies for mainstreaming inclusive education in teacher education practice for pedagogical proficiency included curriculum implementation, policy shift, contextualisation and interactive systems. Monitoring and evaluation in all three cases focused on teaching practice, assessment, feedback tools, forums and curriculum implementation, but the absence of specific indicators for monitoring and evaluation was evident. These findings suggest multi-layered and complex implications for policy formulation, implementation practices and future research. Therefore, this thesis argues that, in a southern Africa context, the potential of pedagogical proficiency from the nexus of inclusive education, ESD and teacher education involves considering biopsychosocial characteristics to facilitate the capabilities of teacher educators. This situation necessitates utilising inclusivity mechanisms in pre-service teacher training grounded in biosocial and psychocultural realities of the region’s educational challenges. Consequently, this thesis proffers the Sustainable Inclusive Pedagogical Proficiency Process (SIP3) model as a framework to actualise the nexus of inclusive education, ESD and teacher education, and bring into focus its pedagogical proficiency potential which eventually helps with the mainstreaming process in teacher education practice via ESD. The study reported in this thesis contributes to international theory and practice development for inclusivity and ESD in teacher education practice, provides indicators for monitoring inclusive quality education in teacher education practice, and introduces a contextual dynamics model for comparative education research. The thesis is structured in eight chapters, introducing the study context, addressing literature gaps, presenting the theoretical framework, detailing research design, exploring specific cases in Malawi, Tanzania and Eswatini, discussing the research findings and its implications, and concluding with recommendations for change and future research.Thesis (PhD) -- Faculty of Education, Secondary and Post School Education, 202
Follow the yellow flag road : advancing the biological control of a global wetland invader, and a case study on ecosystem recovery
Full text linkGlobal change is accelerating habitat degradation and extinction rates, disproportionately affecting freshwater ecosystems. Biological invasions, a core component of global change, have been recognized as a major driver of this phenomenon. Invasive alien aquatic plants (IAAPs) are a prime example, disrupting ecological dynamics and hindering the economic and social activities that depend upon freshwater ecosystems. The best approach to managing IAAPs is preventing their introduction and taking swift action when infestations are detected. Unfortunately, most IAAPs are only recognized after they have spread, making eradication difficult and requiring expensive, ongoing management through manual, mechanical, or chemical means, which become less effective as infestations grow. In this regard, a sustainable alternative against IAAPs is provided by classical biological control. This method lays on the assumption that invasive species have been introduced in an environment which is free from their natural enemies, and that such release allowed them to redirect their resources towards growth and reproduction. Accordingly, weed biocontrol involves introducing one such enemy - a so-called biocontrol agent - to regulate the population of the plant, ideally reducing its density below a critical threshold, minimizing its impacts. Biocontrol programs must follow stringent protocols in order to a) ensure the selection of the most appropriate agents; b) guarantee their establishment and effectiveness in controlling their target; c) minimize the risks involved with their release; and d) monitor their impacts after they have been released. This thesis is composed of two parts, focusing on pre-release studies (Part I, Chapters 1-4) and post-release evaluations (Part II, Chapter 5), respectively. Part I explores the biological control of Iris pseudacorus L. (Iridaceae) – yellow flag – a Eurasian plant that has invaded temperate wetlands worldwide. The first step consisted of conducting field surveys across the native range of the weed, which led to the selection of three candidate biocontrol agents. As a second step, bioclimatic niche modelling was used to forecast the current and future suitability of the weed and its prospective agents. These models helped to identify areas most at risk of invasion and predict how climate change might affect biocontrol efficacy, showing differing impacts in the Northern and Southern Hemispheres. Further, a scoring system was developed to prioritize non-target plants for host-specificity testing, focusing on species within the family Iridaceae. Most taxa prioritized are native to the Americas, South Africa and eastern Asia, highlighting the importance of collaboration across regions when dealing with global invaders with complex phylogeographic distributions. Finally, a germination study confirmed that I. pseudacorus seeds from Argentina germinate more than Belgian seeds, especially in absence of cold stratification, suggesting increased performances of invasive populations and an adaptation to warmer temperatures. Nonetheless, impact assessments conducted on one of the three biocontrol agents demonstrated that it could cause juvenile mortality, suggesting it may effectively reduce seedling recruitment, though further research on agents targeting reproductive structures is recommended. Part II of the thesis addresses an often understudied aspect of post-release evaluations: ecosystem recovery following biological control. To do so, a case study is presented, investigating the biological control of water fern, Azolla filiculoides Lamb. (Salviniaceae), in Belgium. The results of this study are used to discuss the shortcomings of different experimental designs, the lack of baseline data in invasion ecology, and the intricacies of defining and quantifying ecosystem recovery in light of legacy effects and context-dependency.Wereldwijde verandering versnelt de degradatie van habitats en de uitstervingscijfers, met een onevenredige impact op zoetwaterecosystemen. Biologische invasies, een kernonderdeel van klimaatverandering, worden erkend als een belangrijke drijvende kracht achter dit fenomeen. Invasieve uitheemse waterplanten (IAAPs) zijn een duidelijk voorbeeld, omdat ze ecologische dynamiek verstoren en economische en sociale activiteiten belemmeren die afhankelijk zijn van zoetwaterecosystemen. De beste aanpak voor het beheer van IAAPs is het voorkomen van hun introductie en het nemen van snelle maatregelen bij het detecteren van besmettingen. Helaas worden de meeste IAAPs pas herkend nadat ze zich hebben verspreid, wat uitroeiing moeilijk maakt en dure, voortdurende beheersing vereist door handmatige, mechanische of chemische middelen, die minder effectief worden naarmate besmettingen toenemen. In dit opzicht biedt klassieke biologische bestrijding een duurzaam alternatief tegen IAAPs. Deze methode berust op de veronderstelling dat invasieve soorten zijn geïntroduceerd in een omgeving die vrij is van hun natuurlijke vijanden, waardoor ze hun middelen konden richten op groei en reproductie. Bijgevolg omvat onkruidbestrijding het introduceren van een dergelijke vijand - een zogenaamde biocontrole-agent - om de populatie van de plant te reguleren, idealiter door de dichtheid ervan onder een kritische drempel te verlagen en zo de impact ervan te minimaliseren. Biocontroleprogramma's moeten strikte protocollen volgen om a) de selectie van de meest geschikte agens te waarborgen; b) hun vestiging en effectiviteit bij het beheersen van hun doel te garanderen; c) de risico's van hun vrijlating te minimaliseren; en d) hun impact na vrijlating te monitoren. Dit proefschrift bestaat uit twee delen, gericht op respectievelijk pre-release studies (Deel I, Hoofdstukken 1-4) en post-release evaluaties (Deel II, Hoofdstuk 5). Deel I onderzoekt de biologische bestrijding van Iris pseudacorus L. (Iridaceae) - gele lis - een Euraziatische plant die gematigde moeraslanden wereldwijd heeft gekoloniseerd. De eerste stap bestond uit het uitvoeren van veldonderzoeken in het inheemse verspreidingsgebied van het onkruid, wat leidde tot de selectie van drie kandidaat-biocontroleagenten. Als tweede stap werd bioklimatisch nis-modelleren gebruikt om de huidige en toekomstige geschiktheid van het onkruid en zijn potentiële agens te voorspellen. Deze modellen hielpen gebieden met het grootste risico op invasie te identificeren en voorspelden hoe klimaatverandering de effectiviteit van biocontrole zou kunnen beïnvloeden, met verschillende effecten op het noordelijk en zuidelijk halfrond. Daarnaast werd een scoresysteem ontwikkeld om niet-doelplanten te prioriteren voor host-specifieke tests, met de nadruk op soorten binnen de familie Iridaceae. De prioritaire taxa zijn inheems in Amerika, Zuid-Afrika en Oost-Azië, wat het belang van samenwerking tussen regio’s onderstreept bij het omgaan met mondiale invasieve soorten met complexe fylogeografische verspreiding. Ten slotte bevestigde een kiemingsstudie dat I. pseudacorus zaden uit Argentinië meer kiemen dan Belgische zaden, vooral bij afwezigheid van koude stratificatie, wat wijst op verhoogde prestaties van invasieve populaties en aanpassing aan warmere temperaturen. Nochtans toonden effectbeoordelingen van een van de drie biocontroleagens aan dat deze de mortaliteit van juvenielen kon veroorzaken, wat suggereert dat het effectief kan zijn bij het verminderen van de zaailingrekrutering. Toch wordt verder onderzoek naar agenten die zich richten op reproductieve structuren aanbevolen. Deel II van het proefschrift behandelt een vaak onderbelicht aspect van post-release evaluaties: ecosysteemherstel na biologische bestrijding. Om dit te realiseren wordt een casestudy aangeboden over de biologische bestrijding van watervaren, Azolla filiculoides Lamb. (Salviniaceae), in België. De resultaten van deze studie worden gebruikt voor de bespreking van de tekortkomingen van verschillende experimentele ontwerpen, het gebrek aan basisgegevens in invasie-ecologie en de complexiteit van het definiëren en kwantificeren van ecosysteemherstel in het licht van nalatenschapseffecten en contextafhankelijkheid.Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 202