Dominant ants can control assemblage species richness in a South African savanna
Article first published online: 14 JUL 2008
© 2008 The Author. Journal compilation © 2008 British Ecological Society
Journal of Animal Ecology
Volume 77, Issue 6, pages 1191–1198, November 2008
How to Cite
Parr, C. L. (2008), Dominant ants can control assemblage species richness in a South African savanna. Journal of Animal Ecology, 77: 1191–1198. doi: 10.1111/j.1365-2656.2008.01450.x
- Issue published online: 14 OCT 2008
- Article first published online: 14 JUL 2008
- Received 13 September 2007; accepted 19 June 2008; Handling Editor: Andy Gonzalez
- assemblage structure;
- behavioural dominance;
- numerical dominance;
- 1Competition is considered a key factor structuring many communities, and has been described as the ‘hallmark’ of ant ecology. Dominant species are thought to play a key role structuring local ant assemblages through competitive exclusion.
- 2However, while there have been many studies demonstrating competitive exclusion and consequently reduced richness at baits, it is not clear whether such regulation of ‘momentary’ diversity at clumped food resources can scale up to the regulation of richness at the site or assemblage level.
- 3In this study, ant assemblages were sampled in three different savanna habitats in South Africa using both baiting and pitfall trapping.
- 4As has been found in previous studies, there was a unimodal relationship between dominant ants and species richness at baits, with high abundances of dominant ants regulating species richness through competitive exclusion. Analysis of pitfall samples revealed strong convergence in pattern, and results from null model co-occurrence analyses supported the findings.
- 5The importance of competition in structuring local ant assemblages was, however, only apparent at one of the three savanna habitats suggesting that a full range of extreme environments is needed to produce the full unimodal relationship at the assemblage level.
- 6Although the relative importance of competition varied with habitat type, the study demonstrated that in some habitats, dominant ants can control species richness at the assemblage level.