Macroinvertebrates in the Savannah River Below Richard B. Russell Lake, Georgia and South Carolina
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
Pagination or Media Count:
A survey of the macroinvertebrate community in the Savannah River below Richard B. Russell Lake, Georgia and South Carolina, was conducted in October 1989. The purpose was to collect benthic data prior to maintenance dredging in the river immediately below the dam. The macroinvertebrate fauna in this reach of the Savannah River was dominated by oligochaete worms 64.8 percent with lesser numbers of chironomid larvae 10.7 percent, the phantom midge Chaoborus sp. 8.1 percent, and bivalve molluscs 9.0 percent. Macroinvertebrates other than these groups were uncommon 3.8 percent and consisted mainly of Trichopterans Crynellus fraternus and Oecetis sp., the Megalopteran Sialis rotunda and the burrowing mayfly, Hexagenia sp. Total macroinvertebrate density at six stations ranged from 237.3 to 2,480.0 individualssq m. Sixteen species of chironomidae were identified species diversity 2.05 and evenness 0.74 were moderate for this group. Fourteen species of oligochaetes were identified species diversity 1.48 and evenness 0.56 were substantially less than for chironomidae.