An Environmental Survey of Effects of Dredging and Spoil Disposal, New London, Connecticut.
Quarterly rept. no. 7, 1 Jan-31 Mar 76.
NATIONAL MARINE FISHERIES SERVICE HIGHLANDS N J MIDDLE ATLANTIC COASTAL FISHERIES CENTER
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The MIddle Atlantic Coastal Fisheries Centers analysis of benthic macrofauna populations continued to reveal no distinct impact of spoiling outside the immediate disposal area. Only small changes were found between winter 1974 and winter 1975 in species diversity, numbers of individuals and species at four stations located 12 - 1 n.mi from the disposal buoy. The University of Connecticut, surveying effects of storms on suspended materials in the Thames River, demonstrated that the lower river is not much affected by routine storms. Impacts of dredging on overall concentrations of suspended materials were smaller still. Concentrations of heavy metals in tissues of oysters, hard clams and another bivalve, Pitar morrhuana, from the Thames showed significant differences both among species and with time for a given species. The data indicates that the species concentrated metals differentially, but that the temporal changes were independent of dredging.
- Civil Engineering