A5069991022- Plant Diversity and Evolution
- Plant Taxonomy and Phylogenetics
- Ecology and Vegetation Dynamics Studies
- Botany and Plant Ecology Studies
- Genetic diversity and population structure
- Plant and animal studies
- Botany, Ecology, and Taxonomy Studies
- Plant and Fungal Species Descriptions
- Aquatic Invertebrate Ecology and Behavior
- Plant Parasitism and Resistance
- Species Distribution and Climate Change
- Sesquiterpenes and Asteraceae Studies
- Marine Biology and Ecology Research
- Insect-Plant Interactions and Control
- Ethnobotanical and Medicinal Plants Studies
- Crustacean biology and ecology
- Mediterranean and Iberian flora and fauna
- Plant Pathogens and Fungal Diseases
- Wildlife Ecology and Conservation
- Plant and fungal interactions
- Genomics and Phylogenetic Studies
- African Botany and Ecology Studies
- Animal Ecology and Behavior Studies
- Amphibian and Reptile Biology
- Marine and coastal plant biology
Memorial Sloan Kettering Cancer Center
2025
University of Pretoria
2016-2024
University of the Free State
2022
Rhodes University
2010-2019
Transnational Press London
2010
Stockholm University
2006
Florida College
2005
University of Florida
2005
University of Florida Health Science Center
2005
Royal Botanic Garden Sydney
1997
Dating the Tree of Life has now become central to relating patterns biodiversity key processes in Earth history such as plate tectonics and climate change. Regions with a Mediterranean have long been noted for their exceptional species richness high endemism. How when these biota assembled can only be answered good understanding sequence divergence times each components. A critical aspect dating by using molecular is incorporation multiple suitable age constraints. Here, we show that...
Abstract Aim The flowering plant family Proteaceae is putatively of Gondwanan age, with modern and fossil lineages found on all southern continents. Here we test whether the present distribution can be explained by vicariance caused break‐up Gondwana. Location Africa, especially Australia, New Zealand, South America, Caledonia, Guinea, Southeast Asia, Sulawesi, Tasmania. Methods We obtained chloroplast DNA sequence data from rbc L gene, L‐ atp B spacer, gene leaf samples forty‐five genera...
This analysis goes beyond many phylogenies in exploring how phylogenetic structure imposed by morphology, ecology, and geography reveals useful evolutionary data. A comprehensive range of such diversity is evaluated within tribe Indigofereae outgroups from sister tribes. combined data set 321 taxa (over one-third the tribe) 80 morphological characters, 833 aligned nuclear ribosomal ITS/5.8S sites, an indel 33 characters was subjected to parsimony analysis. Notable results include Madagascan...
The snake superfamily Elapoidea presents one of the most intransigent problems in systematics Caenophidia. Its monophyly is undisputed and several cohesive constituent lineages have been identified (including diverse clinically important family Elapidae), but its basal phylogenetic structure obscure. We investigate relationships spatial temporal history using 94 caenophidian species approximately 2300-4300 bases DNA sequence from nuclear four mitochondrial genes. Phylogenetic reconstruction...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 337:135-144 (2007) - doi:10.3354/meps337135 Unexpected genetic structure of mussel populations in South Africa: indigenous Perna perna and invasive Mytilus galloprovincialis G. I. Zardi1,*, C. D. McQuaid1, P. R. Teske1,2, N. Barker2 1Department Zoology Entomology, 2Molecular Systematics Group, Botany...
The ability of plant lineages to reach all continents contributes substantially their evolutionary success. This is exemplified by the Poaceae, one most successful angiosperm families, in which higher taxa (tribes, subfamilies) have global distributions. Due old age ocean basins relative major radiations, this only possible means long-distance dispersal (LDD), yet attributes with LDD remain obscure. Polyploid species are over-represented invasive floras and previously glaciated Arctic...
Phylogenetic relationships among advanced snakes (Acrochordus + Colubroidea = Caenophidia) and the position of genus Acrochordus relative to colubroid taxa are contentious. These concerns were investigated by phylogenetic analysis fragments from four mitochondrial genes representing 62 caenophidian genera 5 noncaenophidian taxa. Four methods phylogeny reconstruction applied: matrix representation with parsimony (MRP) supertree consensus, maximum parsimony, likelihood, Bayesian analysis....
Sequence data from the plastid encoded gene rbcL are used to determine phylogenetic relationships between various lineages in grasses, with particular emphasis on subfamily Arundinoideae. Thirty four sequences, producing 155 phylogenetically informative sites, were analysed using both parsimony and distance methods. Cladistic analyses indicate that there two main lineages: Pooideae (including Stipeae) a large clade comprising Panicoideae, Arun- dinoideae, Chloridoideae, Centothecoideae. The...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 314:283-293 (2006) - doi:10.3354/meps314283 Impacts of marine biogeographic boundaries on phylogeographic patterns three South African estuarine crustaceans Peter R. Teske1,2,*, Christopher D. McQuaid2, P. William Froneman2, Nigel Barker1 1Molecular and Systematics Group, Botany Department, Rhodes University,...
A new suprageneric classification of the Proteaceae is presented that takes account available molecular systematic results, synthesised as a phylogenetic supertree.Subfamilial, tribal and subtribal names are recircumscribed or created, where necessary, to ensure putative monophyly named higher taxa.Subfamilies, tribes subtribes briefly described.One subfamily, Symphionematoideae, two tribes, Petrophileae, Leucadendreae, four subtribes, Leucadendreae subtribe Isopogoninae, Leucadendrinae,...
Abstract Background Genetic breaks separating regional lineages of marine organisms with potentially high broadcasting abilities are generally attributed either to dispersal barriers such as currents or upwelling, behavioural strategies promoting self-recruitment. We investigated whether patterns could also be explained by adaptations different environmental conditions studying two morphologically distinguishable genetic the estuarine mudprawn Upogebia africana across a biogeographic...
The Sneeuberg mountain complex (Eastern Cape) comprises one of the most prominent sections Great Escarpment in southern Africa but until now has remained botanically least known regions. is a discrete orographical entity, being delimited east by Fish River valley, west Nelspoort Interval, to south Plains Camdeboo, and north Karoo pediplain. highest peaks range from 2278 2504 m above sea level, summit plateaux 1800 2100 m. Following extensive literature review detailed collecting programme,...
We explore the potential impact of conflicting gene trees on inferences evolutionary history above species level. When conflict between is discovered, it common practice either to analyze data separately or combine having excluded taxa partitions for those (which are then recoded as missing). demonstrate an alternative approach, which involves duplicating in matrix, such that each duplicate represented by one partition only. This allows combination all available standard phylogenetic...
Objectives: Cutaneous adnexal carcinomas (CACs) are rare skin cancers with no established treatment guidelines. Given the limited data, this study aims to explore characteristics and outcomes of patients CAC treated radiation therapy (RT). Methods: Patients diagnosed between 2000 2020 who received RT were included. Kaplan-Meier methods measured time local recurrence (LR), regional (RR), locoregional (LRR), distant metastasis (DM), progression-free survival (PFS). Fisher exact test compared...
We present a new generic classification of the largely Southern Hemisphere grass subfamily Danthonioideae. This is based on an almost completely sampled and well-resolved molecular phylogeny complete morphological data set. have attempted to delimit monophyletic genera (complicated by presence apparent intergeneric hybridization), which are diagnosable, as well morphologically ecogeographically coherent. recognize 17 genera, including five (Austroderia N. P. Barker & H. Linder, Capeochloa...
Abstract Cicadas have been shown to be useful organisms for examining the effects of distribution, plant association and geographical barriers on gene flow between populations. The cicadas Platypleura stridula species complex are restricted biologically diverse Cape Floristic Region (CFR) South Africa. They thus an excellent study group elucidating mechanisms by which hemipteran diversity is generated maintained in CFR. Phylogeographical analysis this using mitochondrial DNA Cytochrome...
The importance of vicariance events on the establishment phylogeographic patterns in marine environment is well documented, and generally accepted as an important cause cladogenesis. Founder dispersal (i.e. long-distance followed by founder effect speciation) also frequently invoked a genetic divergence among lineages, but its role has long been challenged biogeographers. likely to be common species that colonize remote habitats means rafting (e.g. seahorses), are rare subsequent additional...