Ecology of the plant-dwelling spiders (Arachnida: Araneae) of the Erfenis Dam Nature Reserve, South Africa

Koedoe - African Protected Area Conservation and Science

Field Value
Title Ecology of the plant-dwelling spiders (Arachnida: Araneae) of the Erfenis Dam Nature Reserve, South Africa
Creator Fourie, René Haddad, Charles R. Dippenaar-Schoeman, Anna S. Grobler, Anel
Subject Ecology Erfenis Dam; foliage; grass; spiders; SANSA
Description As part of the South African National Survey of Arachnida in the Grassland Biome, foliage-dwelling and grass-dwelling spiders (Arachnida: Araneae) were collected in the Erfenis Dam Nature Reserve in the central Free State Province from November 2005 to August 2007. Foliage-dwelling spiders were collected from three common tree or shrub species (Acacia karroo, Searsia ciliata and Searsia lancea) and grass-dwellers from four contrasting grasslands (uniform Themeda triandra, mixed, weedy and woodland grasslands). From the grass layer, 1649 spiders were collected, representing 15 families and 82 species, whilst 496 tree-dwelling spiders were collected that represented 17 families and 52 species. There was some overlap in the fauna of the two strata, resulting in a total of 108 species from 18 families being collected. The Araneidae, Philodromidae, Salticidae and Thomisidae were consistently the most abundant in all grassland types and tree species, although Salticidae were scarce on A. karroo. Assemblage analysis indicates high similarity and overlap in the fauna of the four grassland types, suggesting that the structural complexity of grasslands has a limited effect on species composition. In contrast, the foliage-dwelling assemblages were more distinct, with only some overlap between the faunas of S. ciliata and A. karroo, suggesting a stronger vegetation structural effect in shaping arboreal spider assemblages. The isolation of trees and shrubs within the extensive grassy habitat may contribute to the more unique fauna and lower species richness of the woody vegetation. Conservation implications: This study uncovered a rich diversity of plant-dwelling spiders from central South Africa. Grassland faunas show considerable temporal variation and some variability in microhabitat preferences, and sampling protocols should take this into account when spiders are considered in management plans and biodiversity surveys in reserves and private land.
Publisher AOSIS Publishing
Contributor National Research Foundation of South Africa
Date 2013-04-09
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — Survey
Format text/html application/octet-stream text/xml application/pdf application/pdf
Identifier 10.4102/koedoe.v55i1.1113
Source Koedoe; Vol 55, No 1 (2013); 9 pages 2071-0771 0075-6458
Language eng
Coverage South Africa; Erfenis Dam Nature Reserve Modern Total counts; abundance; species richness
Rights Copyright (c) 2013 René Fourie, Charles R. Haddad, Anna S. Dippenaar-Schoeman, Anel Grobler