Diversity patterns of temporary wetland macroinvertebrate assemblages in the south-western Cape, South Africa

  • MC Mlambo
  • MS Bird
  • CC Reed
  • JA Day

Abstract

Although macroinvertebrates are potentially useful for assessing the condition of temporary wetlands, little is yet known about them. Macroinvertebrate  assemblages were assessed in 138 temporary wetlands in the south-western Cape, recording 126 taxa. However, predicted richness estimates were all higher than the observed richness. Five new species were collected—three hydraenid beetles, one streptocephalid fairy shrimp and one hydryphantid acarine—indicating the current paucity of knowledge about temporary wetland macroinvertebrates. The occurrence of the invasive snail Aplexa marmorata (Physidae) in this region was recorded for the first time. Assemblages were dominated by a few widespread taxa. Only four out of 73 genera accounted for more than half the total relative abundance and only two of these occurred in more than half the wetlands. Vegetated biotopes supported a higher relative abundance than open-water biotopes, but no difference existed between wetlands with one, two or three biotopes, indicating the conservation  potential of wetlands with homogeneous biotopes. Wetlands from the different wetland regions did not show a clear separation based on their assemblage  composition.

Keywords: Acarina, Aplexa marmorata, Cederberg, flagship species, Mediterranean-type climate

African Journal of Aquatic Science 2011, 36(3): 299–308

Author Biographies

MC Mlambo
Freshwater Research Unit, Department of Zoology, University of Cape Town, Rondebosch 7700, South Africa; Current address: Department of Biology, University of Oulu, PO Box 3000, FIN-90014 Oulu, Finland
MS Bird
Freshwater Research Unit, Department of Zoology, University of Cape Town, Rondebosch 7700, South Africa
CC Reed
Freshwater Research Unit, Department of Zoology, University of Cape Town, Rondebosch 7700, South Africa
JA Day
Freshwater Research Unit, Department of Zoology, University of Cape Town, Rondebosch 7700, South Africa
Section
Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914