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Agricultural land use affects abundance and dispersal tendency of predatory arthropods

Author:
  • Helena I. Hanson
  • Klaus Birkhofer
  • Henrik G. Smith
  • Erkki Palmu
  • Katarina Hedlund
Publishing year: 2017-02-01
Language: English
Pages: 40-49
Publication/Series: Basic and Applied Ecology
Volume: 18
Document type: Journal article
Publisher: Elsevier

Abstract english

Predatory arthropods contribute to biological control, but to become an integral part of agricultural management, it is essential to identify drivers of their spatio-temporal distribution at the landscape scale. This study focuses on how agricultural land use affects the community composition, emergence and dispersal tendency of predatory arthropods. The arthropods were collected in emergence traps during the growing season (14 weeks) in a gradient of agricultural land uses from intensively managed sugar beet fields, over winter wheat fields, to less intensively managed grasslands. The emergence traps were equipped with one pitfall trap and a collecting bottle at the top. The distribution of the arthropods between these two collecting methods was assumed to represent their tendency to move out of the habitat. The grasslands had the highest numbers of spiders, while the winter wheat fields had the highest numbers of omnivorous rove beetles and macropterous predaceous ground beetles. The phenology of emergence differed between the land-use types, resulting in seasonal differences in community composition. The overall dispersal tendency of predatory arthropods was higher in crop fields than in grasslands. This study suggests that only a diverse mix of agricultural land uses will provide high levels of predators from different functional groups, throughout the growing season.

Keywords

  • Environmental Sciences
  • Ecology
  • Biological control
  • Emergence
  • Functional groups
  • Landscape
  • Natural enemies
  • Phenology

Other

Published
  • ISSN: 1439-1791
Henrik Smith
E-mail: henrik.smith [at] biol.lu.se

Professor

Biodiversity

+46 46 222 93 79

+46 70 978 20 56

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Director

Centre for Environmental and Climate Research (CEC)

+46 46 222 93 79

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