Termite responses to long term burning regimes in southern African savannas : patterns, processes and conservation

Show simple item record

dc.contributor.advisor Van Rensburg, Berndt J. en
dc.contributor.coadvisor Parr, Catherine Lucy en
dc.contributor.postgraduate Davies, Andrew Byron en
dc.date.accessioned 2013-09-06T23:37:28Z
dc.date.available 2010-10-15 en
dc.date.available 2013-09-06T23:37:28Z
dc.date.created 2010-06-21 en
dc.date.issued 2010-10-15 en
dc.date.submitted 2010-06-21 en
dc.description Dissertation (MSc)--University of Pretoria, 2010. en
dc.description.abstract Termites are considered to be major ecosystem engineers in tropical and sub-tropical environments, and fire in savanna systems is regarded as a major and necessary disturbance for the maintenance of biodiversity. However, most fire ecology studies have focused on vegetation dynamics with little attention given to other taxa, especially invertebrates. This thesis has addressed several aspects of savanna termite ecology. First, based on a review of studies examining the relationship between fire ecology and termites, I found that few broad conclusions can be made based on the published literature. Hence little is known on the interactions between termites and ecological processes such as fire. Leading on from this, several recommendations are provided in the thesis for future research to improve ecological understanding of savannas and the dynamics that structure these systems. Second, savanna termite responses to long-term burning regimes were investigated across four distinct savanna types along a rainfall gradient in South Africa using comprehensive sampling protocols. This was achieved using experimental burning plots which have been in place in the Kruger National Park (KNP) since 1954 as well as sites in Hluhluwe-iMfolozi Park. Termite communities were found to differ significantly between these savannas with higher diversity at Pretoriuskop, a mesic savanna but not the wettest. Termite diversity was lowest at the most arid site (Mopani) but certain feeding groups peaked at Satara, a savanna with intermediate rainfall. Differences between these savannas are attributed to broad underlying changes in net primary productivity, temperature and soil type, with the role of mammalian herbivores also being considered. Seasonality was also examined and it was found that termite activity peaks in the wet and transitional seasons and is significantly lower in the dry season. Considering different fire regimes, termites, in general, were found to be highly resistant to burning, but assemblage composition was affected, this being more pronounced at the mesic savanna where fire has more effect on vegetation. These assemblage changes are linked to changes in vegetation structure caused by fire. Finally, termite ecology is often constrained by sampling difficulties and a lack of sampling protocols in savannas. A comparison of two often used sampling methods, baiting and active searching, was conducted across the savanna types studied. The efficiency of sampling method varied along the rainfall gradient and a single method was not the best for all savanna types. In mesic savannas, active searching (an often neglected sampling method in savannas) was most effective at sampling termite diversity while baiting was more effective in arid savannas, although this method is biased toward wood-feeding termites from feeding group II. Baiting also provides a better measure of termite activity than active searching. I demonstrate that termite communities differ significantly with savanna habitat and their responses to long-term burning regimes differ between these habitat types. Although termite communities were found to be quite resistant to burning, the degree of resistance differed with savanna type and management policies in protected areas and elsewhere need to take this into account when formulating conservation policies. Similarly, sampling methods differ in their efficiency at different sites which needs to be considered when designing sampling protocols in order to accurately reflect the biodiversity present. en
dc.description.availability unrestricted en
dc.description.department Zoology and Entomology en
dc.identifier.citation Davies, AB 2010, Termite responses to long term burning regimes in southern African Savannas : patterns, processes and conservation, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/25711 > en
dc.identifier.other C10/521/ag en
dc.identifier.upetdurl http://upetd.up.ac.za/thesis/available/etd-06212010-184939/ en
dc.identifier.uri http://hdl.handle.net/2263/25711
dc.language.iso en
dc.publisher University of Pretoria en_ZA
dc.rights © 2010 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. en
dc.subject Fire ecology en
dc.subject Hluhluwe-imfolozi park en
dc.subject Invertebrates en
dc.subject Kruger national park en
dc.subject Long-term burning regimes en
dc.subject Rainfall gradient en
dc.subject Sampling protocols en
dc.subject Savanna en
dc.subject Seasonal differences en
dc.subject Termites en
dc.subject UCTD en_US
dc.title Termite responses to long term burning regimes in southern African savannas : patterns, processes and conservation en
dc.type Dissertation en


Files in this item

This item appears in the following Collection(s)

Show simple item record