An Analysis of Freshwater Mussels (Unionidae) in the Lower Ohio River at Two Beds Near Olmsted, Illinois: 1992 Studies.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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A survey to assess community characteristics, density, population demography of dominant species, and the likelihood of finding endangered species of freshwater mussels Unionidae was conducted in the lower Ohio River near Olmsted, IL. Data will be used to analyze impacts of construction and operation of a new lock and dam at River Mile RM 964.4 on the Ohio River. Species diversity 2.36 and evenness 0.80 were higher upriver than downriver of Lock and Dam 53 1.55 and 0.51 at three farshore sites at RM 967. Based on quantitative samples taken upriver of the lock, five species individually comprised more than 10 percent of the community. These species and their percent abundance were as follows Fusconaia ebena 21 percent, Truncilla donaciformis 16 percent, Quadrula pustulosa 12 percent, T. truncata 12 percent, and Obliquaria reflexa 10 percent. Fusconaia ebena and M. nervosa comprised a greater fraction of the community downriver than upriver of Lock and Dam 53. Quadrula pustulosa, Q. quadrula, Q. metanevra, and 0. reflexa had greater relative abundance upriver than downriver of Lock and Dam 53. Density of native unionids 15.0 to 105.2 individualssquare meter and Corbicula fluminea 229.4 to 653.8 individualssquare meter varied significantly among nearshore, midshore, and farshore sites downriver of Lock and Dam 53. Endangered species, Ohio River, Environmental impacts, Plethobasus cooperianus, Freshwater mussels, Unionidae.