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Providing evidence to improve practice

Individual study: Effects of mountain stream restoration on carabid beetles and grasshoppers in Thuringia and Hessen, Germany

Published source details

Armbruster J. (2001) Der Einfluss von Renaturierungen in Mittelgebirgsauen auf die Laufkäfer-und Heuschreckenfauna (The influence of restoration projects in Mittelgebirgsauen on ground beetles and grasshoppers fauna). Mitteilungen der deutschen Gesellschaft für allgemeine und angewandte Entomologie, 13, 369-371

Summary

Stream restorations may affect the fauna living in habitats adjacent to streams.

This study compared communities of carabid beetles and grasshoppers along restored reaches of mountain streams with those in artificially straightened stream reaches in Thuringia and Hesse, Germany.

No information was provided on the methods of stream restoration, except that the restored stream reaches had increased channel dynamics.

Examples of four habitats - river bank, annually cut meadow, shrub stand and permanent grassland - were studied alongside restored and unrestored reaches of streams. Four pitfall traps (8.5 cm in diameter, filled with diethylene glycol) were installed in each habitat type for 14 days. Traps were emptied four times from April to July and twice in August. Hand sampling was also conducted.

Species of both carabid beetle and grasshopper associated with riparian and swamp habitats were more dominant alongside restored reaches than in unrestored reaches. In contrast, alongside restored reaches there were 20 to 60% fewer species (and individuals) characteristic of open landscapes.

The authors conclude that communities of carabid beetles and grasshoppers rapidly respond to stream restorations.