Effects of Increased Commercial Navigation Traffic on Freshwater Mussels in the Upper Mississippi River: 1993 Studies.
Abstract
In 1988, the U.S. Army Engineer District, St. Louis, initiated a monitoring program to analyze the effect of commercial navigation traffic on freshwater mussels (Mollusca; Unionidae), especially the endangered Lampsilis higginsi, in the upper Mississippi River (UMR). Preliminary studies were conducted in 1988, and detailed studies were initiated in 1989 and will continue until 1994. In August-September 1993, freshwater mussels were collected using qualitative and quantitative (0.25 sq m total substrate) methods in the main and east channel of Pool 10 near River Mile (RM) 635.2. The sampling program was reduced in 1993 because of high water throughout most of the UMR. Using quantitative methods, a total of 19 and 20 bivalve species were collected at nearshore and farshore sites in the main channel. Overall species diversity (H') was similar at both sites, 1.70 and 1.58 at the nearshore and farshore sites, respectively. In the main channel, 15.66 and 11.54 of the fauna showed evidence of recent recruitment at nearshore and farshore sites, respectively. Density (individuals/square meter) at the nearshore (64.5) and farshore site (56.1) was not significantly different (F = 1.85, P > 0.05). The endangered L. higginsi comprised 0.25 percent (one individual collected) and 0.11 percent (four individuals collected) using qualitative and quantitative methods, respectively, in the main channel.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1995
- Accession Number
- ADA293562
Entities
People
- Andrew C. Miller
- Barry S. Payne