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Widen C.-J.,Sulkapolku 6 A 31 | Fraser-Jenkins C.R.,Stud. Guest House | Roux J.P.,South African National Botanical Institute
Annales Botanici Fennici | Year: 2015

The phloroglucinol composition of 29 species of Dryopteris Adanson belonging to subgenus Dryopteris section Marginatae were investigated on a world-wide basis, and the taxonomy is discussed based on both morphology and chemistry. The ferns of this section show relatively variable phloroglucinol patterns in line with their morphological variability. In good agreement with the other sections of subgenus Dryopteris, the majority of ferns of sect. Marginatae contain considerable amounts of phloroglucinols (crude filicin) and oleo-resin (ether extract) in their rhizomes and stipe-bases. However, D. porosa from China and the Hawai'ian species D. mauiensis were lacking in these phenolics. The African species, D. pentheri, D. lewalleana and D. manniana, are subdivided here into two separate chemical races, however, this does not affect their taxonomic identity, except in the case of D. manniana. Dryopteris wideniana Fraser-Jenk. is described as a new species in the D. manniana aggregate from S and E Africa. © 2015 Finnish Zoological and Botanical Publishing Board. Source


Ziervogel G.,University of Cape Town | New M.,University of Cape Town | Archer van Garderen E.,University of Witwatersrand | Midgley G.,South African National Botanical Institute | And 5 more authors.
Wiley Interdisciplinary Reviews: Climate Change | Year: 2014

In this paper we review current approaches and recent advances in research on climate impacts and adaptation in South Africa. South Africa has a well-developed earth system science research program that underpins the climate change scenarios developed for the southern African region. Established research on the biophysical impacts of climate change on key sectors (water, agriculture, and biodiversity) integrates the climate change scenarios but further research is needed in a number of areas, such as the climate impacts on cities and the built environment. National government has developed a National Climate Change Response White Paper, but this has yet to translate into policy that mainstreams adaptation in everyday practice and longer-term planning in all spheres and levels of government. A national process to scope long-term adaptation scenarios is underway, focusing on cross-sectoral linkages in adaptation responses at a national level. Adaptation responses are emerging in certain sectors. Some notable city-scale and project-based adaptation responses have been implemented, but institutional challenges persist. In addition, a number of knowledge gaps remain in relation to the biophysical and socio-economic impacts of climate change. A particular need is to develop South Africa's capacity to undertake integrated assessments of climate change that can support climate-resilient development planning. © 2014 The Authors. WIREs Climate Change published by John Wiley & Sons, Ltd. Source


Steyn H.M.,South African National Botanical Institute | Bester S.P.,South African National Botanical Institute | Bester S.P.,North West University South Africa | Bezuidenhout H.,Scientific Services | Bezuidenhout H.,Applied Behavioural Ecology and Ecosystem Research Unit
South African Journal of Botany | Year: 2013

An updated checklist is provided for the flora of Tankwa Karoo National Park, which occupies an area of 143,600. ha. A total of 730 species and 780 plant taxa (species, subspecies and varieties), representing 267 genera in 73 families, are recorded for the park. This comprises 30 bryophytes, 7 pteridophytes, 189 monocotyledons and 554 dicotyledons. Sixteen species are endemic or near-endemic to the Hantam-Tanqua-Roggeveld subregion. Twenty-eight species are of conservation concern and six species have been declared as alien invasives. © 2013 South African Association of Botanists. Source

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