Long-term stability of grazing lawns in a small protected area, the Mountain Zebra National Park

Koedoe - African Protected Area Conservation and Science


 
 
Field Value
 
Title Long-term stability of grazing lawns in a small protected area, the Mountain Zebra National Park
 
Creator Novellie, Peter Gaylard, Angela
 
Subject Conservation, ecology, wildlife management biodiversity; grazing exclosures; grazing lawns; heterogeneity paradigm; protected area management; range succession
Description We examined a heavily grazed plant community dominated by creeping grass species with the aim of, (1) determining its response to the exclusion of grazing and (2) its long-term persistence. This plant community was particularly favoured by wild ungulate species that prefer short grasses – blesbok (Damaliscus dorcas phillipsi), springbok (Antidorcas marsupialis) and black wildebeest (Connochaetes gnou). Exclusion of grazing by large herbivores by means of fencing resulted in the virtual disappearance of the creeping grasses and their replacement by tall tufted species. On plots that remained unfenced, the plant species composition was found to be little changed after an interval of more than 20 years. The number large stock unit equivalents (LSU) per ha carried by the plant community was used as a proxy for grazing intensity. Monitored for approximately 2 years at the start of the study, LSU per ha was found to greatly exceed levels recommended for commercial livestock production. This plant community conforms to a recently published definition of a grazing lawn, in that intense grazing promotes palatable, grazing-tolerant grass species.Conservation implications: The positive association between grazers and grazing-tolerant grass species evidently persisted for more than 20 years and there was no evidence of an increase in abundance of unpalatable plant species. Despite the small size of the park, which limited the extent of large herbivore movements, localised heavy grazing did not lead to range degradation.
 
Publisher AOSIS Publishing
 
Contributor
Date 2013-08-13
 
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — Plot methods, survey
Format text/html application/octet-stream text/xml application/pdf
Identifier 10.4102/koedoe.v55i1.1108
 
Source Koedoe; Vol 55, No 1 (2013); 7 pages 2071-0771 0075-6458
 
Language eng
 
Relation https://koedoe.co.za/index.php/koedoe/article/view/1108/1522 https://koedoe.co.za/index.php/koedoe/article/view/1108/1523 https://koedoe.co.za/index.php/koedoe/article/view/1108/1524 https://koedoe.co.za/index.php/koedoe/article/view/1108/1521
 
Coverage protected areas, Nama Karoo Biome, South Africa — plant species composition, large herbivore densisties
Rights Copyright (c) 2013 Peter Novellie, Angela Gaylard https://creativecommons.org/licenses/by/4.0