Accession Number : ADA328812

Title :   Value of Selected Mussel Beds in the Upper Mississippi River for Lampsilis Higginsi.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

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

PDF Url : ADA328812

Report Date : JUL 1997

Pagination or Media Count : 73

Abstract : Bivalve surveys were conducted at six locations in the upper Mississippi River at beds designated as essential habitat for the endangered mussel Lampsilis higginsi (Lea). Mussel beds were located at Drew Chute, Pool 19, near River Mile (RM) 407, left descending bank (LDB); Sylvan Slough, Pool 15, near RM 485, LDB; Goetz Island, Pool 11, near RM 612, right descending bank (RDB); lower East Channel, Pool 10, near RM 635; Harpers Slough, Pool 10, near RM 641, RDB; and Whiskey Rock, Pool 9, near RM 656, RDB. All of these beds were characterized by moderate to high densities of native mussels (17.6 +/- 1.5 to 37.6 +/- 3.0 (+/- Standard Error) and species richness 16-24, 30 species overall). Evidence of recent recruitment (number of individuals and species less than 30-mm total shell length) was 11.3 to 32.3 percent of individuals present and 40.0 to 56.0 percent of species present. At the majority of sites, mean numbers of the nonindigenous zebra mussel, Dreissena polymorpha, ranged from 49 to just under 1,000 individuals/square meter. At two sites in Pool 10 immediately downriver of the Highway 18 Bridge, total zebra mussel density was 10,328 and 6,852 individuals/square meter. Mean density of L. higginsi ranged from 0.3 to 0.27 individual/square meter and was present at all beds surveyed except the bed in Pool 19. Although relatively uncommon (less than 1 percent of the fauna), total numbers of this species present ranged from 5,690 +/- 9,538 to 169,585 +/- 127,057 at the bed in Pool 10 and the lower East Channel, respectively. Based upon Jaccard's Index, presence of L. higginsi was correlated with certain species, although there does not appear to be a specific causative factor present to explain these relationships.

Descriptors :   *MEASURING INSTRUMENTS, *MUSSELS, SHELLS(STRUCTURAL FORMS), HABITATS, ENDANGERED SPECIES, MISSISSIPPI RIVER, CHANNELS, SUMMER, ECOLOGY, MOLLUSCA.

Subject Categories : Biology
      Ecology

Distribution Statement : APPROVED FOR PUBLIC RELEASE