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Effects of benthic barriers on macroinvertebrate communities

Abstract : Field experiments were conducted testing the effects of synthetic fabric barriers on benthic macroinvertebrates in Eau Galle Reservoir, Wisconsin, Lake Guntersville, Alabama, and ponds at the Lewisville Aquatic Ecosystem Research Facility of the Corps of Engineers in Lewisville, Texas. A large decline in macroinvertebrate density (70 - 90 percent) was noted within 4-6 weeks of barrier placement at all sites. Detailed monitoring at Lewisville revealed that the density decline was rapid, occurring within 1 week of barrier placement. Community composition changes were also noted, with chironomids being especially negatively affected at both Guntersville and Lewisville. Long-term studies at Eau Galle and Lewisville showed that effects were sustained as long as barriers remained in place. Studies of community recovery after barrier removal at Lewisville indicated near full recovery in terms of both density and relative abundance of major taxonomic groups. Aquatic plant control, Environmental effects, Benthic barriers, Macroinvertebrates Bottom screens