Landscape mosaic attributes for maintaining ground-living spider diversity in a biodiversity hotspot
Article first published online: 10 FEB 2014
© 2014 The Royal Entomological Society
Insect Conservation and Diversity
Volume 7, Issue 5, pages 470–479, September 2014
How to Cite
Gaigher, R., Samways, M. J. (2014), Landscape mosaic attributes for maintaining ground-living spider diversity in a biodiversity hotspot. Insect Conservation and Diversity, 7: 470–479. doi: 10.1111/icad.12070
- Issue published online: 11 SEP 2014
- Article first published online: 10 FEB 2014
- Manuscript Accepted: 3 JAN 2014
- National Department of Science and Technology
- National Research Foundation and Stellenbosch University
- Agroecosystem management;
- arthropod conservation;
- conventional agriculture;
- landscape ecology;
- organic agriculture
- Spiders often dominate predator assemblages in vineyard agroecosystems. Land-use practices that enhance their diversity may be important for regional biodiversity conservation as well as biological control of vineyard pests.
- We surveyed ground-dwelling spiders in habitats at different management intensities (natural habitat remnants, organic vineyards, and conventional vineyards) in the vineyard landscape of the Cape Floristic Region (CFR) biodiversity hotspot, South Africa, to examine the effects of local land use on spider diversity.
- Natural habitat remnants contributed significantly to the overall diversity, and supported rare families and unique species that were not found in the agricultural matrix. Nevertheless, vineyards still supported fairly high spider diversity, with a tendency for higher species richness in organic vineyards. Environmental variables relating to plant diversity, management intensity and distance to nearest natural habitat influenced spider abundance and species richness, and changes to these factors may improve the habitability of the vineyard landscape for spiders.
- All habitats supported various spider families that are known to prey on South African crop pests. In addition, spiders were abundant in both sampling seasons (autumn and spring), but showed a significant increase in vineyards early in the growing season, suggesting that they may provide early-season background regulation of pests.
- There is considerable opportunity for spider conservation in the CFR vineyard landscape, as well as the possibility of associated benefits to biological control within vineyards.