Responses of macroinvertebrate communities to river restoration in a channelized segment of the Shibetsu River, Northern Japan
Article first published online: 2 JUN 2006
Copyright © 2006 John Wiley & Sons, Ltd.
River Research and Applications
Volume 22, Issue 6, pages 681–689, July 2006
How to Cite
Nakano, D. and Nakamura, F. (2006), Responses of macroinvertebrate communities to river restoration in a channelized segment of the Shibetsu River, Northern Japan. River Res. Applic., 22: 681–689. doi: 10.1002/rra.928
- Issue published online: 19 JUN 2006
- Article first published online: 2 JUN 2006
- Manuscript Accepted: 22 NOV 2005
- Manuscript Revised: 12 SEP 2005
- Manuscript Received: 5 APR 2005
- Ministry of Education, Science and Culture, Japan. Grant Numbers: 14206039, 153602721
- Foundation for Riverfront Improvement and Restoration
- river restoration;
- reconstructed meanders;
- groyne structures;
- lowland rivers;
- channel straightening;
- macroinvertebrate community;
- riverbed stability
The effects of restoration of channel meandering and of groyne structures on physical variables and river-dwelling macroinvertebrates were examined in a lowland river, the Shibetsu River in Northern Japan. The lowland segment of the Shibetsu River, which previously meandered, was straightened by channelization and groynes installed on some portions of the channelized reach. In 2002, the channelization works were partly reversed to improve the degraded river ecosystem.
Physical environment variables and macroinvertebrate community structure and composition were compared among reconstructed meanders and channelized reaches with and without groynes. The shear stress of the river edge in reconstructed meanders and groyne reaches was lower than that in a channelized reach. In addition, the edge habitat near the stream bank created by the reconstructed meander and groyne reaches had higher total density and taxon richness of macroinvertebrates than those of the channelized reach. Restoration provided a relatively stable edge habitat, contributing to the recovery of macroinvertebrate communities in such channelized lowland rivers. The placement of groynes can be an effective method of in-stream habitat restoration for macroinvertebrates. Copyright © 2006 John Wiley & Sons, Ltd.