Invertebrate Colonization Rates in the Tailwater of a Kentucky Flood-Control Reservoir

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Abstract
Invertebrate colonization of newly introduced rock substrates was examined from July through Oct. 1982 in the tailwater of Barren River Lake, Kentucky. Chironomidae, the dominant taxon of benthic insects, reached full colonization by day 14. Colonization by Oligochaeta, the other major invertebrate taxon, was not completed by the end of the 95-day period of observation. It may have been delayed because insufficient food (periphyton and detritus) and accumulated on the clean rocks. Rapid recolonization of dewatered substrates may be especially critical for maintaining adequate fish food in tailwaters of flood-control reservoirs.