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Management intensity at field and landscape levels affects the structure of generalist predator communities

Author:
  • Adrien Rusch
  • Klaus Birkhofer
  • Riccardo Bommarco
  • Henrik Smith
  • Barbara Ekbom
Publishing year: 2014
Language: English
Pages: 971-983
Publication/Series: Oecologia
Volume: 175
Issue: 3
Document type: Journal article
Publisher: Springer

Abstract english

Agricultural intensification is recognised as a major driver of biodiversity loss in human-modified landscapes. Several agro-environmental measures at different spatial scales have been suggested to mitigate the negative impact of intensification on biodiversity and ecosystem services. The effect of these measures on the functional structure of service-providing communities remains, however, largely unexplored. Using two distinct landscape designs, we examined how the management options of organic farming at the field scale and crop diversification at the landscape level affect the taxonomic and functional structure of generalist predator communities and how these effects vary along a landscape complexity gradient. Organic farming as well as landscapes with longer and more diversified crop rotations enhanced the activity-density of spiders and rove beetles, but not the species richness or evenness. Our results indicate that the two management options affected the functional composition of communities, as they primarily enhanced the activity-density of functionally similar species. The two management options increased the functional similarity between spider species in regards to hunting mode and habitat preference. Organic farming enhanced the functional similarity of rove beetles. Management options at field and landscape levels were generally more important predictors of community structure when compared to landscape complexity. Our study highlights the importance of considering the functional composition of generalist predators in order to understand how agro-environmental measures at various scales shape community assemblages and ecosystem functioning in agricultural landscapes.

Keywords

  • Earth and Related Environmental Sciences
  • Ecology
  • Agri-environmental measures
  • Biological pest control
  • Community
  • composition
  • Crop rotation
  • Functional diversity
  • Natural enemies
  • Organic farming
  • Traits

Other

Published
  • BECC
  • ISSN: 1432-1939
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