Original Research

The alpine flora on inselberg summits in the Maloti–Drakensberg Park, KwaZulu-Natal, South Africa

Robert F. Brand, Rob Scott-Shaw, Timothy G. O’Connor
Bothalia | Vol 49, No 1 | a2386 | DOI: https://doi.org/10.4102/abc.v49i1.2386 | © 2019 Robert F. Brand, Charles R. Scott-Shaw, Timothy G. O’Connor | This work is licensed under CC Attribution 4.0
Submitted: 03 July 2018 | Published: 12 March 2019

About the author(s)

Robert F. Brand, Cuyahoga County Board of Health, Ohio, United States; and, Department of Soil, Crop and Climate Science, University of the Free State, Bloemfontein, South Africa
Rob Scott-Shaw, Ezemvelo KwaZulu-Natal Wildlife, Pietermaritzburg, South Africa
Timothy G. O’Connor, South African Environmental Observation Network, Pretoria, South Africa


See Updates


Share this article

Bookmark and Share

Abstract

Background: Inselberg summits adjacent to the Maloti–Drakensberg escarpment occupy an alpine zone within the Drakensberg Alpine Centre (DAC). Inselbergs, the escarpment and surrounding mountains such as Platberg experience a severe climate; inselberg summits are distinct by being protected from human disturbance.

Objectives: The aim of this article was to describe for the first time the flora of inselberg summits and to assess their potential contribution to conservation of DAC plant diversity.

Method: We investigated whether the flora of inselberg summits formed a representative subset of the DAC flora in terms of shared, especially endemic or near endemic, species and representation of families. All species were listed for six inselbergs between Giant’s Castle and Sentinel, located in the Royal Natal National Park (RNNP) during November 2005. Comparisons, using literature, were made with floras of the DAC, as well as Platberg, an inselberg approximately 60 km north from Sentinel in the RNNP.

Results: We recorded 200 species of pteridophytes and angiosperms on inselbergs, 114 DAC endemics or near endemics, one possible new species, and several range and altitudinal extensions. Asteraceae, Poaceae and Ericaceae comprised 42.1% of endemic and near endemic species, with Scrophulariaceae and Hyacinthaceae contributing 8.8%. Inselberg and DAC floras differed in respective rankings of Crassulaceae (8th vs. > 15th), Polygalaceae, Apiaceae and Rosaceae (10th, 11th, 12th vs. > 15th), Poaceae (2nd vs. 5th), Cyperaceae (3rd vs. 4th) and Scrophulariaceae (6th vs. 2nd). Growth forms on inselbergs were consistent with DAC flora. Inselbergs shared 40% of species with Platberg.

Conclusion: Inselbergs, which supported 7.9% of species occurring in the DAC flora, are well protected from human impact, lack alien plants, but, despite this, are highly vulnerable to climate change. Conservation importance of inselbergs will increase as escarpment vegetation becomes increasingly degraded as a consequence of intensifying land use.


Keywords

Endemic/near-endemic; climate change; grasses; growth form; phytogeographic affinities; inselberg conservation

Metrics

Total abstract views: 131
Total article views: 73


Crossref Citations

No related citations found.