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The response of carabids to landscape simplification differs between trophic groups
Tobias Purtauf1, Jens Dauber, Volkmar Wolters
1IFZ, Department of Animal Ecology, Justus-Liebig-University of Giessen, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany. tobias.purtauf@allzool.bio.uni-giessen.de
Oecologia
|October 19, 2004
Summary
Landscape simplification reduces carabid beetle diversity in wheat fields. Declines in carnivores, phytophages, and omnivores suggest habitat loss impacts specific resources, affecting biological control services.
Area of Science:
- Ecology
- Entomology
- Agricultural Science
Background:
- Carabid beetles are important natural enemies in agricultural ecosystems.
- Landscape simplification in agricultural areas can impact biodiversity.
- Understanding carabid responses to landscape changes is crucial for sustainable agriculture.
Purpose of the Study:
- To investigate how landscape simplification affects carabid beetle species richness and density in wheat fields.
- To determine the differential responses of carabid trophic groups (carnivores, phytophages, omnivores) to landscape simplification.
- To elucidate the drivers of carabid species loss and its implications for biocontrol.
Main Methods:
- Studied 36 wheat fields, measuring landscape simplification by non-crop habitat percentage.
- Collected carabids using pitfall traps.
- Categorized carabids into trophic groups based on existing literature.
Main Results:
- Carabid species richness and density decreased with increasing landscape simplification.
- The decline order for species richness was carnivores > phytophages > omnivores.
- Density compensation in carnivores and phytophages indicated loss of specific resources, not overall food availability.
Conclusions:
- Species loss in carabids is driven by both local and regional factors, with increasing sensitivity to landscape change across trophic ranks.
- Agricultural management practices differentially affect carabid trophic groups.
- Declining carabid populations may compromise their role as biocontrol agents in agroecosystems.