Landscape complexity and farming practice influence the condition of polyphagous carabid beetles

  • Östman Ö
  • Ekbom B
  • Bengtsson J
 et al. 
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Previous work has suggested that the condition of polyphagous predatory carabid beetles can be influenced by landscape structure and farming practice. However, earlier studies aimed at testing the effect of farming practice on insect condition and reproduction have not been designed to test this accurately because farms representing different cultivation systems have not had similar landscape complexity. In this study we measured the condition of the polyphagous predatory carabid beetles Harpalus rufipes, Pterostichus cupreus, P. melanarius, and P. niger from five pairs of conventional and organic farms in central east Sweden. The farms within each pair were near to each other and had similar size, land use, and landscape structure. The condition of the beetles was measured as the residuals from the regression between ln(elytra length) and ln(body mass). We show that the residuals for P. melanarius were positively correlated with their fat reserves. For P. melanarius, residuals were higher on farms where ...

Author-supplied keywords

  • Aphids
  • Beetle
  • Carabidae
  • Condition
  • Farming practice
  • Fat reserve
  • Landscape composition
  • Landscape structure
  • Mass-length residuals
  • Natural enemies

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  • Örjan Östman

  • Barbara Ekbom

  • Janne Bengtsson

  • Ann Christin Weibull

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