Accession Number:

ADA214464

Title:

Phase 1 Studies: Impacts of Commercial Navigation Traffic on Freshwater Mussels: A Review

Descriptive Note:

Final rept.

Corporate Author:

ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

Report Date:

1989-10-01

Pagination or Media Count:

57.0

Abstract:

Turbulence and wave wash from commercial navigation vessels can resuspend sediments, reverse river currents, and cause water drawdown. These physical effects can stress or kill pelagic fish eggs and larvae, bottom- dwelling invertebrates such as freshwater mussels Family Unionidae, aquatic insects, worms, and crustaceans. Impacts of navigation traffic have been studied in the field and the laboratory. In field studies, investigators have measured wave height, drawdown, current reversals, and suspended sediment concentrations associated with passage of commercial vessels. These data have been used to make judgements on the effects of traffic on naturally occurring populations and to construct predictive physical models. Naturally occurring populations can be studied at sites affected by commercial traffic. Test sites can be located close to the navigation lane, and control or reference sites can be located some distance away. At each site, important biological parameters individual condition, density, biomass, evidence of recent recruitment, species richness, or species diversity can be determined for organisms of interest. Changes in water velocity or suspended sediments can be measured before and after tow passage. These studies should be continued for several years to determine if commercial traffic is affecting naturally occurring populations.

Subject Categories:

  • Biology
  • Surface Transportation and Equipment
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE