The Effects of Increased Commercial Navigation Traffic on Freshwater Mussels in the Upper Mississippi River: 1990 Studies.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
Pagination or Media Count:
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 1990, mussels were collected using qualitative and quantitative 0.25 sq m total substrate methods at dense and diverse beds in Pool 17 RM 450.4 and 448.7 and Pool 12 RM 571.5. Water velocity and suspended solids concentrations were measured immediately following vessel passage at sites where mussels were collected. An assessment of commercial navigation traffic effects will be based on a comparison of baseline data 1989-94 with data collected during periods of increased traffic intensity following 1994. Commercial navigation traffic, Freshwater mussels.