Guiding conservation efforts in the Hantam–Tanqua–Roggeveld (South Africa) using diversity parameters

Koedoe - African Protected Area Conservation and Science


 
 
Field Value
 
Title Guiding conservation efforts in the Hantam–Tanqua–Roggeveld (South Africa) using diversity parameters
 
Creator van der Merwe, Helga van Rooyen, Margaretha W.
 
Subject Conservation; Botany Shannon index; Simpson index; species evenness; species richness; Whittaker plots
Description The Hantam–Tanqua–Roggeveld subregion falls within the Succulent Karoo and Fynbos Biomes, which are both recognised as global biodiversity hotspots that should be conserved. The objective of this study was to gather baseline biodiversity information that can be used to guide conservation efforts. A total of 40 Whittaker plots were surveyed in the subregion and the various diversity parameters calculated from the data were compared across the subregion and to available data for the Succulent Karoo and Fynbos Biomes. Species richness per 1000 m2 ranged from nine to 100 species across the subregion. Species richness for all plot sizes 1000 m2 was significantly lower for the Tanqua Karoo than for both the Winter Rainfall Karoo and Mountain Renosterveld. The latter two areas did not differ significantly from each other with regard to species richness. Species richness was significantly higher only at the 1000 m2 scale in the Mountain Renosterveld compared to the Winter Rainfall Karoo. Evenness and Shannon and Simpson indices did not differ significantly between the Mountain Renosterveld and Winter Rainfall Karoo; however, these values were significantly higher than for the Tanqua Karoo. A principal coordinate analysis of species richness data at seven plot sizes produced three distinct clusters. One cluster represented the Tanqua Karoo, with low species richness, evenness, and Shannon and Simpson indices. Another cluster represented mostly Mountain Renosterveld vegetation, which was characterised by a high species richness, evenness, and Shannon and Simpson indices. The third cluster was formed by the remaining Mountain Renosterveld plots as well as the Winter Rainfall Karoo plots.The high species richness values found in the various vegetation units can add valuable information to the conservation planning arena by providing information on biodiversity parameters and their spatial distribution. This information can assist with conservation efforts in the Hantam, Tanqua and Roggeveld areas.Conservation implications: Conservation and development of the Hantam–Tanqua– Roggeveld subregion is hampered by a lack of information on floristic diversity. The results of the current study indicated areas of low diversity and contrasting areas of high diversity. These data can be used to guide effective conservation and management of the floristic diversity.
 
Publisher AOSIS Publishing
 
Contributor Critical Ecosystem Partnership Fund National Research Foundation
Date 2011-09-15
 
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — Whittaker plots
Format text/html application/epub+zip text/xml application/pdf
Identifier 10.4102/koedoe.v53i1.1018
 
Source Koedoe; Vol 53, No 1 (2011); 9 pages 2071-0771 0075-6458
 
Language eng
 
Relation https://koedoe.co.za/index.php/koedoe/article/view/1018/1322 https://koedoe.co.za/index.php/koedoe/article/view/1018/1324 https://koedoe.co.za/index.php/koedoe/article/view/1018/1323 https://koedoe.co.za/index.php/koedoe/article/view/1018/1321 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/813 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/814 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/815 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/816 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/817 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/818 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/819 https://koedoe.co.za/index.php/koedoe/article/downloadSuppFile/1018/820
 
Coverage Hantam-Tanqua-Roggeveld Recent study species richness; species evenness, Shannon index; Simpson index
Rights Copyright (c) 2011 Helga van der Merwe, Margaretha W. van Rooyen https://creativecommons.org/licenses/by/4.0