Match!

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

Published on Jul 1, 2015in New Phytologist7.30
· DOI :10.1111/nph.13342
G. Anthony Verboom20
Estimated H-index: 20
(UCT: University of Cape Town),
Nicola G. Bergh7
Estimated H-index: 7
+ 2 AuthorsMatthew N. Britton4
Estimated H-index: 4
(UCT: University of Cape Town)
Abstract
Summary 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.
  • References (49)
  • Citations (19)
References49
Newest
#1Jasper A. Slingsby (UCT: University of Cape Town)H-Index: 12
#2Matthew N. Britton (University of California, Berkeley)H-Index: 1
Last.G. Anthony Verboom (UCT: University of Cape Town)H-Index: 20
view all 3 authors...
#1Rachel Prunier (MSU: Michigan State University)H-Index: 4
#2Kent E. Holsinger (UConn: University of Connecticut)H-Index: 37
Last.Jane E. Carlson (UConn: University of Connecticut)H-Index: 9
view all 3 authors...
#1Lydie M Dupont (University of Bremen)H-Index: 38
#2H. P. Linder (UZH: University of Zurich)H-Index: 31
Last.Enno Schefuß (University of Bremen)H-Index: 28
view all 4 authors...
#1Jane E. Carlson (UConn: University of Connecticut)H-Index: 9
#2Kent E. Holsinger (UConn: University of Connecticut)H-Index: 37
Last.Rachel Prunier (MSU: Michigan State University)H-Index: 4
view all 3 authors...
#1Krystal A. Tolley (Stellenbosch University)H-Index: 26
#2Atherton L. de Villiers (Stellenbosch University)H-Index: 4
Last.G. John Measey (UWC: University of the Western Cape)H-Index: 20
view all 4 authors...
#1Richard I. Milne (Edin.: University of Edinburgh)H-Index: 24
#2Chantel Davies (Edin.: University of Edinburgh)H-Index: 2
Last.David F. Chamberlain (RBGE: Royal Botanic Garden Edinburgh)H-Index: 3
view all 5 authors...
Cited By19
Newest
#1Brian M. Chase (CNRS: Centre national de la recherche scientifique)H-Index: 29
#2Arnoud Boom (University of Leicester)H-Index: 19
Last.Paula J. Reimer ('QUB': Queen's University Belfast)H-Index: 38
view all 0 authors...
#1Rafael O. Wüest (WSL: Swiss Federal Institute for Forest, Snow and Landscape Research)
#2Florian C. Boucher (Stellenbosch University)H-Index: 10
Last.H. Peter Linder (UZH: University of Zurich)H-Index: 36
view all 5 authors...
#1Nicolai M. Nürk (University of Bayreuth)H-Index: 6
#2N. M. Nürk (Yale University)
Last.Philipp M. Schlüter (University of Hohenheim)
view all 18 authors...
#1Sabrina S. Gavini (CONICET: National Scientific and Technical Research Council)H-Index: 1
#2Cecilia Ezcurra (CONICET: National Scientific and Technical Research Council)H-Index: 14
Last.Marcelo A. Aizen (CONICET: National Scientific and Technical Research Council)H-Index: 44
view all 3 authors...
#1Nora Mitchell (UConn: University of Connecticut)H-Index: 3
#2Jane E. Carlson (NPS: National Park Service)H-Index: 9
Last.Kent E. Holsinger (UConn: University of Connecticut)H-Index: 37
view all 3 authors...
#1Félix Forest (Royal Botanic Gardens)H-Index: 31
#2Jonathan F. Colville (UCT: University of Cape Town)H-Index: 11
Last.Richard M. Cowling (NMU: Nelson Mandela Metropolitan University)H-Index: 78
view all 3 authors...
#1Florian C. Boucher (Stellenbosch University)H-Index: 10
#2G. Anthony Verboom (UCT: University of Cape Town)H-Index: 20
Last.Allan G. Ellis (Stellenbosch University)H-Index: 18
view all 4 authors...
View next paperBiodiversity hotspots for conservation priorities