Plant endemism in Griqualand West, South Africa

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dc.contributor.author Frisby, Arnold Walter
dc.contributor.author Siebert, Stefan John
dc.contributor.author Struwig, Madeleen
dc.contributor.author Cilliers, Dirk P.
dc.date.accessioned 2020-02-05T05:35:59Z
dc.date.issued 2019-08
dc.description.abstract Griqualand West, a region in the semi-arid Northern Cape and North-West provinces of South Africa, has been variously suggested to contain a number of range-restricted plant species, and was proposed to be a local centre of plant endemism. The Griqualand West Centre (GWC), hitherto demarcated by geological features and limited floristic data, is hereby investigated to determine the true levels of endemism and its extent of occurrence. Findings suggest that at least 23 plant species have their natural distribution ranges restricted to the Griqualand West region. These endemics represent 1.4% of the region's flora. Although this is a lower than the predicted level of endemism, it matches the trends of endemicity found in other centres in semi-arid savanna of southern Africa. Many of the GWC endemics show indications of holo-endemism owing to their apparent preference for the Ca- and Mg-rich substrates of the Ghaap Plateau. When the total distributions of all GWC endemic species are considered, then the resulting boundary of the GWC is more extensive than the substantial area already proposed previously (> 40,000 km2). This study therefore proposes the concept of ‘core area’ in which distant outlier populations of endemic species (> 100 km outside the main distribution range with no suitable habitat in between) are discarded during the demarcation of the centre's boundary. It is proposed that this concept is best applied when assessing extensive areas with few endemic species. A more refined GWC core area will allow for more effective conservation and future research efforts by focussing attention on those areas where high numbers of endemic plant species co-occur. Within the GWC core area, specific regions, such as the increasingly densely populated Kimberley region, the banded ironstone hill ranges, and the unique environment that is the Ghaap Plateau, are highlighted as areas of conservation importance. en_ZA
dc.description.department Plant Production and Soil Science en_ZA
dc.description.embargo 2020-08-01
dc.description.librarian hj2020 en_ZA
dc.description.sponsorship The National Research Foundation (Grant UID: 103370), South Africa en_ZA
dc.description.uri http://www.elsevier.com/locate/sajb en_ZA
dc.identifier.citation Frisby, A.W., Siebert, S.J., Struwig, M. et al. 2019, 'Plant endemism in Griqualand West, South Africa', South African Journal of Botany, vol. 124, pp. 127-137. en_ZA
dc.identifier.issn 0254-6299 (print)
dc.identifier.issn 1727-9321 (online)
dc.identifier.other 10.1016/j.sajb.2019.03.041
dc.identifier.uri http://hdl.handle.net/2263/73109
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2019 SAAB. Published by Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in South African Journal of Botany. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in South African Journal of Botany, vol. 124, pp. 127-137, 2019. doi : 10.1016/j.sajb.2019.03.041. en_ZA
dc.subject Plant endemism en_ZA
dc.subject Griqualand West, South Africa en_ZA
dc.subject Near-endemic en_ZA
dc.subject Limestone en_ZA
dc.subject Ironstone en_ZA
dc.subject Ghaap en_ZA
dc.subject Endemic en_ZA
dc.subject Dolomite en_ZA
dc.subject Centre of endemism en_ZA
dc.title Plant endemism in Griqualand West, South Africa en_ZA
dc.type Postprint Article en_ZA


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