NDLI: Topography as a driver of diversification in the Cape Floristic Region of South Africa.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Verboom, G. Anthony Bergh, Nicola G. Haiden, Sarah A. Hoffmann, Vera Britton, Matthew N.
Spatial Coverage	South Africa
Description	Country affiliation: South Africa Author Affiliation: Verboom GA ( Bolus Herbarium and Department of Biological Sciences, University of Cape Town, Private Bag, 7701, Rondebosch, South Africa.); Bergh NG ( Compton Herbarium, South African National Biodiversity Institute, Private Bag X7, 7735, Claremont, South Africa.); Haiden SA ( Bolus Herbarium and Department of Biological Sciences, University of Cape Town, Private Bag, 7701, Rondebosch, South Africa.); Hoffmann V ( Bolus Herbarium and Department of Biological Sciences, University of Cape Town, Private Bag, 7701, Rondebosch, South Africa.); Britton MN ( Bolus Herbarium and Department of Biological Sciences, University of Cape Town, Private Bag, 7701, Rondebosch, South Africa.)
Abstract	The rugged topography of the Cape Floristic Region (CFR), South Africa, is frequently invoked to explain the spectacular radiation of the Cape flora, but the mechanisms involved remain unclear. Where recent authors emphasize the importance of elevation gradients as stimuli for ecological speciation, earlier workers stressed the role of topography as an isolating mechanism, particularly in montane lineages. Using six Cape plant lineages, we tested whether elevation niches are phylogenetically conserved. We then assessed whether high-elevation species are more consistently range-restricted than low-elevation species, and whether high-elevation sisters show stronger range exclusivity (allopatry) and weaker ecological and phenotypic differentiation, suggestive of nonecological speciation. Elevation niches tend to be phylogenetically conserved. Also, high-elevation species are more consistently range-restricted than low-elevation species, potentially explaining the generally stronger range exclusivity of high-elevation sisters. While the high-elevation zone is less homogeneous ecologically, more data are required to demonstrate that high-elevation sister species show generally weaker ecological and phenotypic differentiation. Topographic complexity promotes geographical isolation at high elevations, thereby providing opportunities for nonecological, vicariant speciation. While recognizing the need for additional data, we suggest that the upland and lowland floras of the CFR may differ with regard to predominant speciation mode.
File Format	HTM / HTML
ISSN	0028646X
Issue Number	2
Volume Number	207
e-ISSN	14698137
Journal	New Phytologist
Language	English
Publisher	Wiley
Publisher Date	2015-07-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany Altitude Angiosperms Genetics Biodiversity Biological Evolution Geological Phenomena Phenotype Phylogeny Adaptation, Physiological Climate Ecology Ecosystem Genetic Speciation South Africa Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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The ubiquity of alpine plant radiations: from the Andes to the Hengduan Mountains.

Data from: Topography as a driver of diversification in the Cape Floristic Region of South Africa (Dataset)

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