The Roggeveldberge — Notes on a botanically hot area on a cold corner of the southern Great Escarpment, South Africa

Clark, Vincent Ralph; Barker, Nigel P.; Mucina, Laco

doi:10.1016/j.sajb.2010.07.001

Cited by 20 publications

(16 citation statements)

References 59 publications

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“…3A) and high plant endemism, the particularly on the Richtersveld (part of the Gariep Centre), Namaqualand (the Kamiesberg Centre, a sub-centre of the CFR) and HantamRoggeveld (the core of the Hantam-Roggeveld Centre; Van Wyk and Smith 2001; Helme and Desmet 2006;Helme 2008;Clark et al 2011b). These are the most arid components of the Escarpment in South Africa, but receive reliable winter rainfall and form part of the very species-rich Succulent Karoo and Fynbos Biomes (Low and Rebelo 1998;Mucina and Rutherford 2006;Desmet 2007).…”

Section: South Africa Lesotho and Swazilandmentioning

confidence: 99%

The Great Escarpment of southern Africa: a new frontier for biodiversity exploration

2011

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The biodiversity of the 5,000 km-long Great Escarpment of southern Africa is currently poorly known, despite hosting half of the subcontinent's centres of plant endemism and to have a rich endemic vertebrate fauna, particularly in the north-west and east. A country-based overview of endemism, data deficiencies and conservation challenges is provided, with Angola being the country in most need of Escarpment research and conservation. Given that the Escarpment provides most of the subcontinent's fresh water, protection and restoration of Escarpment habitat providing such ecological services is urgently required. Key research needs are exhaustive biodiversity surveys, systematic studies to test refugia and migration hypotheses, and the effects of modern climate change. Such research results can then be consolidated into effective conservation planning and coordinated international efforts to protect the rich biodiversity of the Escarpment and the ecological services it provides.

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Section: South Africa Lesotho and Swazilandmentioning

confidence: 99%

The Great Escarpment of southern Africa: a new frontier for biodiversity exploration

2011

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“…Apart from the two sister connections between the NW Centre and HantamRoggeveld there is no direct phylogenetic support for the NW connection, and none for the Matjiesfontein connection (although there is the possibility of these connections in conjunction with the southern Escarpment track -see below under the sub-heading 'Multiple and vague connections'). Complete phylogenies of CFR-centred geophyte genera in the Amaryllidaceae, Colchicaceae, Hyacinthaceae, Iridaceae and Oxalidaceae -species of which are abundant and with many local endemics on the Hantam-Roggeveld, NW and KM Centres (Goldblatt 1984;Manning et al 2002;Mucina and Rutherford 2006;Clark et al 2011b) -may radically alter this picture, however (Procheş et al 2006). Many other species in these genera currently occur on both sides of the Doring River Valley (Goldblatt 1984;Goldblatt and Manning 1998;Manning et al 2002;Clark et al 2011b), suggesting that the NW connection can be considered extant without phylogenetic support.…”

Section: Connectivity Analysis Based On Phylogenetic Relationshipsmentioning

confidence: 99%

“…Complete phylogenies of CFR-centred geophyte genera in the Amaryllidaceae, Colchicaceae, Hyacinthaceae, Iridaceae and Oxalidaceae -species of which are abundant and with many local endemics on the Hantam-Roggeveld, NW and KM Centres (Goldblatt 1984;Manning et al 2002;Mucina and Rutherford 2006;Clark et al 2011b) -may radically alter this picture, however (Procheş et al 2006). Many other species in these genera currently occur on both sides of the Doring River Valley (Goldblatt 1984;Goldblatt and Manning 1998;Manning et al 2002;Clark et al 2011b), suggesting that the NW connection can be considered extant without phylogenetic support. If we take Goldblatt and Manning's (2000) delimitation of the NW Centre, the NW connection is practically a given, as their delimitation includes the Bokkeveld and thus negates the Doring River Valley, while the Bokkeveld abuts the Hantam-Roggeveld with no geomorphological interval (Figure 1).…”

Section: Connectivity Analysis Based On Phylogenetic Relationshipsmentioning

confidence: 99%

Taking the scenic route – the southern Great Escarpment (South Africa) as part of the Cape to Cairo floristic highway

Clark

Barker

Mucina

2011

Plant Ecology & Diversity

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Background: Numerous Cape Floristic Region (CFR) clades are found in the Afromontane region of Africa, causing speculation on the source of their distribution. The southern Escarpment has been postulated as a key link in the movement of Cape species between the CFR and these Afromontane areas. Aims: The strengths of three purported connections (the north-west, Matjiesfontein and south-east) between the CFR and the southern Escarpment are considered, and of the southern Escarpment track itself. Methods: A comprehensive database was compiled from which floristic comparisons and multivariate analyses were undertaken. Palaeo-connectivity was assessed from phylogenetic relationships determined from 19 phylogenies. Results: There is evidence of both palaeo-and current connectivity between the Escarpment and the CFR, most strongly for the SE connection. Current connectivity along the southern Escarpment track is relatively well supported between the eastern Nuweveldberge and Main Drakensberg but not between the Hantam-Roggeveld and Nuweveldberge. Palaeo-connectivity along the southern Escarpment track is well supported by the phylogenies. Conclusions: Climate regime may be a more important factor in floristic connectivity than geomorphological continuity. Historical connectivity along the southern Escarpment track suggests cyclical connectivity, probably in response to glacial-interglacial cycles and associated shifts in rainfall regimes along the southern Escarpment.

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“…The Hantam-Roggeveld Centre of endemism (HRC) sensu Van Wyk and Smith (2001) of South Africa displays very high levels of plant endemism, and is especially rich in geophytes and petaloid monocots (Van Wyk and Smith 2001;Born et al 2007;Clark et al 2011 (Salter 1944;Manning and Goldblatt 2008;Suda et al 2013). Southern African Oxalis species are bulbous eudicots ) that flower during the colder winter months in the winter-rainfall areas of South Africa.…”

mentioning

confidence: 99%

“…Ecology-The Hantam-Roggeveld Centre has long been recognized as a centre of botanical diversity (Clark et al 2011), but its exact demarcation and name has varied through the years (e.g. Hantam-Roggeveld Centre of endemism (HRC) sensu Van Wyk and Smith (2001), Hantam-Tanqua-Roggeveld Region sensu Born et al (2007)).…”

mentioning

confidence: 99%

An Unusual Night-Flowering <I>Oxalis</I> from South Africa (Oxalidaceae)

Dreyer¹,

Macfarlane²,

Roets³

et al. 2014

Systematic Botany

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A new Oxalis (Oxalidaceae) species from the Hantamsberg (South Africa) is described and typified as Oxalis noctiflora using morphological, palynological, and molecular characters. Superficially it closely resembles Oxalis aridicola, Oxalis callosa, Oxalis odorata, and Oxalis primuloides, and it shares a unique supra-areolate pollen type with most of these species. No single vegetative morphological character defines this species, but a unique combination of bulb and leaflet characters distinguishes it from all other known species. The flowers of Oxalis noctiflora are unique for the genus in displaying typical moth-pollination characters. The white flowers open at night, have a long, unusually narrow, corolla tube, and produce a strong sweet scent. All previously described Oxalis species have flowers that open during the day. Phylogenetic analyses based on nuclear Internal Transcribed Spacer data placed this species sister to O. aridicola within a clade of morphologically and palynologically similar taxa.

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The Roggeveldberge — Notes on a botanically hot area on a cold corner of the southern Great Escarpment, South Africa

Cited by 20 publications

References 59 publications

The Great Escarpment of southern Africa: a new frontier for biodiversity exploration

The Great Escarpment of southern Africa: a new frontier for biodiversity exploration

Taking the scenic route – the southern Great Escarpment (South Africa) as part of the Cape to Cairo floristic highway

An Unusual Night-Flowering <I>Oxalis</I> from South Africa (Oxalidaceae)

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