Accession Number : ADA256225


Title :   The Effects of Increased Commercial Navigation Traffic on Freshwater Mussels in the Upper Mississippi River: 1990 Studies.


Descriptive Note : Final rept.,


Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB


Personal Author(s) : Miller, Andrew C ; Payne, Barry S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256225.pdf


Report Date : Jul 1992


Pagination or Media Count : 200


Abstract : 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.


Descriptors :   *ENVIRONMENTAL IMPACT , *NAVIGATION , *MUSSELS , VELOCITY , COMPARISON , MOLLUSCA , MISSISSIPPI RIVER , RIVERS , SITES , INTENSITY


Subject Categories : Biology
      Ecology


Distribution Statement : APPROVED FOR PUBLIC RELEASE