Now showing items 21-26 of 26
A phylogenetic review of the African leaf chameleons: Genus Rhampholeon (Chamaeleonidae): The role of vicariance and climate change in speciation
The phylogenetic associations among 13 currently recognized African leaf chameleon species were investigated by making use of mitochondrial and nuclear DNA sequence data (44 taxa and 4145 characters). The gene tree indicates ...
The Cape element in the Afrotemperate flora: From Cape to Cairo?
The build-up of biodiversity is the result of immigration and in situ speciation. We investigate these two processes for four lineages (Disa, Irideae p.p., the Pentaschistis clade and Restionaceae) that are widespread in ...
How much evolutionary history in a 10 x 10 m plot?
We use a fully dated phylogenetic tree of the angiosperm families to calculate phylogenetic diversity (PD) in four South African vegetation types with distinct evolutionary histories. Since the branch length values are in ...
Molecular systematics of dormice (Rodentia: Gliridae) and the radiation of Graphiurus in Africa
The phylogenetic relationships among the Gliridae (order Rodentia) were assessed using 3430 nucleotides derived from three nuclear fragments (β-spectrin non-erythrocytic 1, thyrotropin and lecithin cholesterol acyl ...
Positive and negative symptoms in affected sib pairs with schizophrenia: Implications for genetic studies in an African Xhosa sample
Careful phenotyping and the identification of subtypes of schizophrenia can contribute significantly to the success of genetic studies in schizophrenia. The phenomenology of schizophrenia in affected sib pairs has been ...
Preserving the evolutionary potential of floras in biodiversity hotspots
One of the biggest challenges for conservation biology is to provide conservation planners with ways to prioritize effort. Much attention has been focused on biodiversity hotspots. However, the conservation of evolutionary ...