Abstract
Non-structural streambank stabilization, or bioengineering, is a common stream restoration practice used to slow streambank erosion, but its ecological effects have rarely been assessed. We surveyed bank habitat and sampled bank macroinvertebrates at four bioengineered sites, an unrestored site, and a comparatively less-impacted reference site in the urban Peachtree-Nancy Creek catchment in Atlanta, GA, USA. The amount of organic bank habitat (wood and roots) was much higher at the reference site and three of the bioengineered sites than at the unrestored site or the other bioengineered site, where a very different bioengineering technique was used (“joint planting”). At all sites, we saw a high abundance of pollution-tolerant taxa, especially chironomids and oligochaetes, and a low richness and diversity of the bank macroinvertebrate community. Total biomass, insect biomass, and non-chironomid insect biomass were highest at the reference site and two of the bioengineered sites (p < 0.05). Higher biomass and abundance were found on organic habitats (wood and roots) versus inorganic habitats (mud, sand, and rock) across all sites. Percent organic bank habitat at each site proved to be strongly positively correlated with many factors, including taxon richness, total biomass, and shredder biomass. These results suggest that bioengineered bank stabilization can have positive effects on bank habitat and macroinvertebrate communities in urban streams, but it cannot completely mitigate the impacts of urbanization.
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Acknowledgments
This project was completed with funding from the Charles S. Mott Foundation to the National River Restoration Science Synthesis project. E. S. Bernhardt, D. S. Leigh, and J. B. Wallace offered comments that helped shape this article. The reviews of D. B. Booth and two anonymous reviewers greatly improved this article. L. Burke, K. Loggins, A. Meadows, I. Mixon, J. Norman, B. Shea, and R. Treuer provided invaluable field and laboratory assistance.
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Sudduth, E.B., Meyer, J.L. Effects of Bioengineered Streambank Stabilization on Bank Habitat and Macroinvertebrates in Urban Streams. Environmental Management 38, 218–226 (2006). https://doi.org/10.1007/s00267-004-0381-6
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DOI: https://doi.org/10.1007/s00267-004-0381-6