Br. Coppedge et Cd. Martin, BENTHIC MACROINVERTEBRATES OF AN IMPOUNDED PRAIRIE STREAM AS AFFECTEDBY COMPLETE IMPOUNDMENT DRAWDOWN, Journal of freshwater ecology, 10(3), 1995, pp. 217-223
The benthic macroinvertebrates of Boomer Creek, Oklahoma, were surveye
d in spring 1993, approximately four years after the complete drawdown
of Boomer take, an impoundment of Boomer Creek. Drawdown restored the
old stream channel within the lakebed to free-flowing conditions, whi
ch resulted in a temporary reestablishment of Boomer Creek through the
lakebed site. Collections of invertebrates were made at eight locatio
ns in each of three stream reaches: upstream and downstream of the for
mer impoundment, and in the stream channel within the former lakebed.
Forty-three taxa were found in the stream, 33 of which occurred in the
lakebed channel. Macroinvertebrate composition differed significantly
among the three stream reaches, but macroinvertebrate densities did n
ot. Dominant taxa in all areas were oligochaetes, chironomids. and a c
orixid predator of these groups, Trichocorixa sp, Other common taxa fo
und included Hyalella azteca, Procambarus sp., Physella sp., and Sphae
rium sp. Thirteen taxa found in the lakebed channel were also found in
an earlier (pre-draining) study of Boomer Lake macroinvertebrates.