Pitfall trapping within enclosures is proposed as a method to get a reliable impression of the relationship between the abundances of a number of coexisting carabid species. The investigations were performed during two years in a heavily grazed pasture at Melle (Belgium). On a rather large scale soil samples could be compared with both enclosed and open pitfall catches. In all cases fenced pitfalls gave ratios between the catches of the different species showing a much better correlation with those from soil samples than the catch-ratios from open pitfalls. This method seems especially suitable to compare the relative abundances of a number of carabid species in short term investigations during periods of peak activities.
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