Effects of Increased Commercial Navigation Traffic on Freshwater Mussels in the Upper Mississippi River: 1991 Studies.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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In 1988, the US Army Engineer District, St. Louis, initiated a program to analyze the effects of commercial navigation traffic on freshwater mussels Mollusca Unionidae, especially the endangered Lampsilis higginsi, in the upper Mississippi River. Preliminary studies were conducted in 1988 detailed studies were initiated in 1989 and will continue for at least 6 years. In July 1991, mussels were collected using qualitative and quantitative 0.25 sq m total substratum methods at dense and diverse beds in Pool 24 river mile RM 299.6, Pool 14 RM 504.8, and Pool 10 RM 635.2. Water velocity and suspended solids concentrations were measured immediately following vessel passage near sites where mussels were collected in Pools 24 and 10. An assessment of commercial navigation traffic effects will be based on a comparison of baseline data 1988-94 with data collected during periods of increased traffic intensity following 1994.... Mississippi River, Navigation traffic, Mussels, Unionidae.
- Marine Engineering
- Water Pollution and Control