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Journal of Insect Conservation

, Volume 17, Issue 3, pp 565–576 | Cite as

Is microclimate-driven turnover of dung beetle assemblage structure in regenerating coastal vegetation a precursor to re-establishment of a forest fauna?

  • Adrian L. V. Davis
  • Rudi J. van Aarde
  • Clarke H. Scholtz
  • Robert A. R. Guldemond
  • Johan Fourie
  • Christian M. Deschodt
ORIGINAL PAPER

Abstract

We questioned the capability of post-mining rehabilitation and successional changes in coastal vegetation to achieve restoration of dune forest, dung beetle assemblages in the Maputaland Centre of Endemism, South Africa. A repeat 2010 study of structural turnover between dung beetle assemblages across a 33 year successional sere of rehabilitating vegetation and old-growth forest (>73 years) produced comparable results to an earlier study across the 23 year chronosequence of 2000. Despite overlap, three structural patterns along the 33 year chronosequence were associated with specific stages of vegetation succession and their characteristic microclimates as in 2000. Although species biased to unshaded habitat dominated the earliest succession, there was rapid re-establishment of dominance by shade-associated forest species. In concert with progression from unshaded, post-mining vegetation to strongly shaded, early successional, Acacia shrub-woodland, there was an initial increase in similarity of the dung beetle fauna (species-poor, low abundance) to that in strongly-shaded forest (also species-poor, low abundance). However, in concert with decreasing shade cover in late successional woodland, the dung beetle fauna became species-rich with high abundance so that the early successional trajectory of increasing similarity to forest fauna either levelled off to a plateau (species in 2000; abundance in 2010) or declined (species in 2010, abundance in 2000). It remains to be seen if gaps forming in the oldest Acacia woodland permit forest tree saplings of the exposed understorey to recreate a forest canopy that would be tracked by dung beetles to re-establish a typically species-poor, deep shade, forest assemblage with low abundance.

Keywords

Acacia karroo woodland Chronosequence Dung beetle Dune forest Patchiness Restoration Richards Bay Scarabaeinae Succession 

Notes

Acknowledgments

Dr. Matthew Grainger, Alida de Flamingh, Carol Hoole, Cher Lawrence, Tamara Lee, Pieter Olivier, and Laura Owens assisted with the field surveys. Staff and postgraduate members of the University of Pretoria, Scarab Research Unit assisted in sorting samples, particularly Dr. Catherine Sole, Dr. Power Tshikae, Dr. Cornel du Toit, Dr. Suko Mlambo, Werner Strümpher, Angelika Switala, and Rentia Tukker. The study was funded through grants to RJvA from Richards Bay Minerals, the Department of Trade and Industry (THRIP), and the National Research Foundation (NRF).

Supplementary material

10841_2012_9542_MOESM1_ESM.doc (686 kb)
Supplementary material 1 (DOC 686 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Adrian L. V. Davis
    • 1
  • Rudi J. van Aarde
    • 2
  • Clarke H. Scholtz
    • 1
  • Robert A. R. Guldemond
    • 2
  • Johan Fourie
    • 2
  • Christian M. Deschodt
    • 1
  1. 1.Scarab Research Unit, Department of Zoology & EntomologyUniversity of PretoriaHatfieldSouth Africa
  2. 2.Conservation Ecology Research Unit, Department of Zoology & EntomologyUniversity of PretoriaHatfieldSouth Africa

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