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Landscape simplification promotes weed seed predation by carabid beetles (Coleoptera: Carabidae)

Author:
  • Dennis Jonason
  • Henrik Smith
  • Jan Bengtsson
  • Klaus Birkhofer
Publishing year: 2013
Language: English
Pages: 487-494
Publication/Series: Landscape Ecology
Volume: 28
Issue: 3
Document type: Journal article
Publisher: Springer

Abstract english

Weeds constitute major constraints for farmers by reducing crop yield and quality. However, weeds are managed effectively using herbicides, but this may cause harmful effects on human health and the environment. In an experiment on weed seed predation, we tested the biological control potential of carabid beetles to combat weeds in the absence of herbicides. Seeds from three common weed species were placed in cereal fields on conventional and organic farms located along a landscape complexity gradient (area annual crops within 1 km) in two distinct regions in Sweden. Carabid beetles were sampled in the same fields using pitfall traps. Neither carabid species richness nor seed removal was related to organic farming. Seed removal was significantly related to carabid species richness and both carabid species richness and seed removal was higher in landscapes with large total area of annual crops, although the evenness of the carabid communities was lower. The carabid genera with strongest positive relationship to seed removal differed between regions (Trechus in Uppland and Pterostichus in Scania), as did the preference for the different weed seed species. This study concludes that carabid species richness contributes to weed seed predation and that large scale landscape context explains more variation in the carabids' responses than local farming practices.

Keywords

  • Ecology
  • Earth and Related Environmental Sciences
  • Agri-environment schemes
  • Agricultural intensification
  • Biological
  • control
  • Ecosystem services
  • Landscape complexity
  • Organic farming

Other

Published
  • BECC
  • ISSN: 1572-9761
Henrik Smith
E-mail: henrik.smith [at] biol.lu.se

Professor

Biodiversity

+46 46 222 93 79

+46 70 978 20 56

E-C313

50

Director

Centre for Environmental and Climate Research (CEC)

+46 46 222 93 79

+46 70 978 20 56

C313

Sölvegatan 37, Lund

50

Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden