Publications
The faunistic diversity of spiders (Arachnida: Araneae) of the South African Cape Floristic Kingdom
A comprehensive survey of spider diversity in the Cape Floral Region Protected Areas, part of South Africa's Cape Floristic Kingdom (CFK), reveals 960 species across 62 families, representing 42.4% of South Africa's known spider fauna. The study, based on data from the South African National Survey of Arachnida (SANSA) up to 2023, identifies 269 endemic species (28%) and highlights conservation concerns for 49 species (5.1%). While most species (71%) are widely distributed with no known threats, significant data gaps remain, particularly among the 229 Data Deficient species. The Salticidae family dominates with 128 species, including 30 endemics, followed by Gnaphosidae, Thomisidae, and Lycosidae. This research underscores the CFK's rich but understudied arachnid biodiversity, emphasizing the need for further exploration to uncover and describe its hidden diversity.
Determination of Hydrological Niche of Restionaceae Species in Silvermine, South Africa
A groundbreaking study reveals the critical role of hydrological factors in shaping the distribution and survival of Restionaceae species within the Cape Floral Region (CFR), a globally significant biodiversity hotspot. This research, conducted at Silvermine, South Africa, demonstrates that microclimate-level hydrological variables are pivotal in determining the niche of these threatened plants, which face existential threats from urbanization, agriculture, and groundwater extraction. By generating unique hydrological datasets, the study not only models species niches with unprecedented accuracy but also provides a robust framework for assessing conservation strategies and predicting long-term impacts of climate change on plant diversity. This work builds upon the CFR's established role as a test case for biodiversity modeling, offering critical insights that could reshape conservation efforts in semi-arid environments worldwide.
Biomes are nobody’s kingdom: on environmental and historical plant geography
This study argues that biomes and floral kingdoms serve distinct, non-overlapping roles in global plant geography. While floral kingdoms (phytochoria) reflect evolutionary history and are defined by endemic taxa, biomes are primarily shaped by environmental factors like climate and soil, with no significant evolutionary component. The research contrasts these concepts, emphasizing that biomes should not be defined by lineage presence or evolution. It highlights the Cape Floral Kingdom's expansion to include diverse biomes, challenging the notion of contiguous floral kingdoms. The study also notes mismatches between biodiversity priorities (phytochoria) and ecosystem service values (biomes), advocating for separate mapping approaches in conservation efforts.
Disentangling native and alien plant diversity in coastal sand dune ecosystems worldwide
A global analysis of coastal sand dune ecosystems reveals distinct patterns and drivers for native and alien plant diversity. Native species richness increases along the sea-to-inland gradient, particularly in the Cape and Paleotropical floristic kingdoms, while alien species richness remains relatively consistent across regions but is strongly influenced by anthropogenic factors such as gross domestic product (GDP). The study, which analyzed 14,841 vegetation plots worldwide using generalized linear models (GLMs) and mixed models (GLMMs), found weak support for the invasion paradox, suggesting that spatial scale plays a minor role in native-alien richness patterns. These findings highlight the need to consider native and alien species separately when studying biodiversity, offering insights for targeted conservation and management strategies.
Accelerating Computer-Based Recognition of Fynbos Leaves Using a Graphics Processing Unit
A significant advancement in plant species identification for the Cape Floristic Kingdom (CFK) has been achieved through GPU-accelerated technology. The Fynbos Leaf Optical Recognition Application (FLORA) now offers faster processing speeds without compromising accuracy, with the GPU-accelerated version saving up to 51.85 milliseconds on average for high-resolution images. This development addresses the challenges faced by volunteers and casual workers in managing this biodiverse region, which is threatened by wildfires and invasive species. The study compared three versions of FLORA—MATLAB prototype, C++ non-accelerated, and C++ GPU-accelerated—and demonstrated a notable speed-up of 8.7 times for the C++ version over the MATLAB prototype. This innovation paves the way for more efficient large-scale plant identification tasks, such as rebuilding feature descriptors in leaf databases.
Underestimated regional species diversity in the Cape Floristic Region revealed by phylogenetic analysis of the Erica abietina/E. viscaria clade (Ericaceae)
Phylogenetic analysis of the Erica abietina/E. viscaria clade (Ericaceae) reveals that the seven currently recognized subspecies of E. abietina represent at least three distinct, endemic lineages with non-overlapping distributions in the Cape Floristic Region (CFR). This challenges current taxonomic classifications and underscores the underestimated regional species diversity within this globally significant floral kingdom. The study, using nuclear ribosomal and plastid DNA sequences, resurrects the name E. grandiflora for two subspecies and introduces a new species, E. situshiemalis, further highlighting the complex endemism of Cape Erica. These findings add to the known endemic species in Table Mountain National Park.
Vegetation responses to season of fire in an aseasonal, fire-prone fynbos shrubland
In the aseasonal, fire-prone fynbos shrubland of South Africa's Cape Floral Region, fire season does not significantly impact proteoid recruitment, unlike in Mediterranean-climate shrublands. The study found that factors such as species type, pre-fire parent density, and post-fire vegetation age were more influential than fire timing or rainfall. While germination occurred primarily during cooler months, summer plantings took longer, indicating limited drought-avoiding dormancy. This flexibility in proteoid recruitment suggests that fire management can be adapted without seasonal restrictions, unlike in winter-rainfall shrublands.
Climate Change Impacts on Hydrological Niches of Restionaceae Species in Jonkershoek, South Africa
Climate change is significantly altering the hydrological niches of Restionaceae species within the Cape Floral Region, posing threats to their survival. This study reveals that microclimatic shifts, driven by changing water availability in South Africa's semi-arid environment, are reshaping plant species distribution and reducing species richness. Researchers generated unique microclimate hydrological datasets for Jonkershoek, a protected area, to model these changes under future climate scenarios. The findings underscore the critical need for monitoring and assessing Restionaceae species to mitigate impacts from urbanization, agriculture, groundwater extraction, and climate change.
Conservation status and management insights from tracking a cryptic and Critically Endangered species of Orchidaceae
A six-year demographic study of the Critically Endangered orchid Disa procera, known from just 50 individuals at a single location, reveals that its population is larger than previously thought and occurs across two distinct sites. The species exhibits high interannual variation in population size and individual turnover, suggesting a short lifespan, yet still meets the criteria for Critically Endangered status. Management insights include avoiding physical damage during its growing season (September–January) and implementing prescribed fire at 10–25-year intervals outside this period. High fruit set rates (68%) indicate no current pollination limitation, but patchy distribution hints at potential dispersal or recruitment constraints. Recommendations emphasize continued protection, monitoring, and further research on pollination, habitat requirements, and mycorrhizal associates.
The effect of elevation and time on mountain spider diversity: a view of two aspects in the Cederberg mountains of South Africa
Spider diversity in the Cederberg mountains of South Africa exhibits complex, aspect-specific patterns influenced by elevation and season. Research reveals that while alpha diversity (species richness) varies with elevation—showing a hump-shaped pattern on the western aspect and a U-shaped one on the eastern—the interaction between season and elevation produces more intricate dynamics during dry periods. Beta diversity, primarily driven by species turnover (60–70% contribution), differs significantly between aspects: increased turnover dominates the western side, while species loss characterizes the eastern. Minimal nestedness suggests localized adaptation rather than hierarchical structuring. The study highlights that large-scale predictors explain little variation in spider diversity, underscoring the importance of local and stochastic processes. Conducted over six years with biannual sampling across 17 sites spanning 1900 meters, this work advances understanding of biodiversity patterns in UNESCO-listed Cape Floral Region Protected Areas.
Hydrological Niche of Restionaceae Species in Silvermine South Africa
A unique hydrological niche model for Restionaceae species in the Cape Floral Region's fynbos biome reveals critical microclimate dependencies, offering new insights into their survival in semi-arid environments. The study demonstrates that hydrological variables—such as soil moisture and groundwater availability—are pivotal in determining species distribution at Silvermine, South Africa. By generating high-resolution microclimate datasets, researchers assessed the effectiveness of these variables in predicting plant niche dynamics, providing actionable data for conservation strategies. This work highlights the vulnerability of Restionaceae to urbanization, agriculture, and climate change, underscoring the need for targeted monitoring to preserve biodiversity in one of the world's six floristic kingdoms.
Wildflower harvesting on the Agulhas Plain, South Africa: Challenges in a fragmented industry
A fragmented wildflower harvesting industry on South Africa’s Agulhas Plain poses risks to the sustainability of the Cape Floristic Region (CFR) and the livelihoods of disadvantaged communities. The study identifies that poor communication and competition among stakeholders hinder collective progress, threatening both biodiversity conservation and socio-economic stability. It proposes the establishment of a 'Wildflower Harvesting Forum' as a solution to foster cooperation and address challenges collaboratively. Using qualitative data from stakeholder interviews, the research underscores the urgent need for industry-wide coordination to ensure the long-term viability of this economically vital yet ecologically sensitive sector.
Floristic and faunal Cape biochoria: do they exist?
The Cape Floral Region (CFR) and its extended counterpart, the Greater Cape Floristic Region (GCFR), exhibit remarkable biotic distinctiveness, characterized by unparalleled species richness and endemism. This study challenges traditional perceptions of biochoria—biogeographical patterns of species distribution—by assessing whether such patterns exist in both floristic and faunal components of this region. Utilizing a comprehensive review of historical and contemporary literature, the research synthesizes data on climatic conditions, phytogeography, and faunal distributions to evaluate the coherence of these biogeographical units. Findings suggest that while the CFR stands out as a unique floral kingdom, its integration with the succulent Karoo region into the GCFR provides a more coherent biogeographical framework. The study underscores the need for recognizing both the distinctiveness and interconnectedness of the Cape's biodiversity, offering insights critical for conservation efforts in UNESCO World Heritage Sites.
Fynbos Honey—Pride Of South Africa's Cape Floristic Kingdom
Fynbos honey, produced by the Cape honeybee (Apis mellifera capensis), stands out as a unique product of South Africa's Cape Floristic Kingdom. This study highlights the distinct characteristics and significance of Fynbos honey, which is derived from the diverse flora found exclusively in this region. The research explores the beekeeping practices associated with this phenomenon, emphasizing its cultural and economic importance. By analyzing the botanical composition and bee behavior, the study provides insights into the ecological and agricultural value of Fynbos honey, contributing to the understanding of this specialized product within South Africa's UNESCO-listed Cape Floral Region Protected Areas.
Fynbos leaf online plant recognition application
A computer-aided plant identification application demonstrates high accuracy and efficiency in recognizing fynbos species using leaf photographs, addressing the challenge of limited flowering periods. The system leverages computer vision and pattern recognition to achieve robust performance, with comprehensive testing validating its effectiveness in online user interfaces and processing speed. This breakthrough offers a practical tool for identifying non-flowering fynbos, enhancing conservation efforts in the Cape Floral Region Protected Areas.
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