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Published on: March 12, 2013
Management intensity and vegetation complexity affect web-building spiders and their prey
Eva Diehl1, Viktoria L Mader, Volkmar Wolters
1Department of Animal Ecology, Justus Liebig University, Heinrich-Buff-Ring 26-32, 35392, Giessen, Germany, eva.diehl@allzool.bio.uni-giessen.de.
Oecologia
|March 16, 2013
Summary
Reduced agricultural management and increased vegetation complexity support diverse arthropods. Web-building spiders in less-managed habitats effectively suppress aphid populations.
Area of Science:
- Ecology
- Agricultural Science
- Entomology
Background:
- Agricultural management and vegetation complexity influence arthropod communities and predator-prey dynamics.
- Web-building spiders are key generalist predators and natural pest enemies in agroecosystems.
Purpose of the Study:
- To investigate the effects of agricultural management intensity and vegetation complexity on web-building spider and prey diversity.
- To assess the impact of these factors on aphid predation by web-building spiders.
Main Methods:
- Studied 12 habitats with varying management (tillage, cutting, grazing, inputs) and vegetation complexity.
- Collected web-building spiders and web-prey manually; quantified potential prey using sticky traps.
- Analyzed spider and prey species richness, composition, and aphid capture efficiency.
Main Results:
- Spider and prey species richness increased with plant diversity and vegetation coverage.
- Aphid predation efficiency by spiders was higher in tilled vs. no-till sites and decreased with vegetation complexity.
- Uncut sites captured 1.8 times more aphids than cut sites, highlighting the negative impact of vegetation cutting.
Conclusions:
- Reduced agricultural management intensity and increased vegetation complexity enhance invertebrate diversity.
- Web-building spiders play a crucial role in aphid suppression, particularly in low-management, complex vegetation habitats.
- Conservation of semi-natural habitats supports landscape-scale aphid control by spiders.
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