10-42 



sewer outfalls. New Haven Harbor sediments, therefore, contain high 

 metal concentrations relative to greater Long Island Sound because of 

 discharges from several sewage treatment plants. Any contribution from 

 the New Haven Harbor is relatively small and obscured by contributions 

 from the sewer outfalls. 



Soft tissue of Crassostrea virginica showed lower levels of 

 trace metals in New Haven Harbor oysters than in five other Long Island 

 Harbors studied. Suspension and deposit feeding molluscs showed slightly 

 higher zinc in New Haven Harbor, but lower copper relative to Long 

 Island Sound. C. virginica showed higher concentrations of these 

 metals than other bivalves analyzed including Mercenaria mercenaria and 

 Mytilus edulis. 



Trace-metal concentrations did not show a pronounced seasonal 

 or spatial pattern in Mercenaria mercenaria soft tissue in New Haven 

 Harbor. 



Impact from New Haven Harbor Station on the trace-metal regime 

 in New Haven Harbor, if present, is overwhelmed by the ambient long-term 

 trace metal supply and removal patterns. 



ACKNOWLEDGMENTS: This research was supported by the United Illum- 

 inating Company and the Department of Energy. 

 Various students at Yale participated in the ana- 

 lytical program. They are R. J. McCaffrey, D. Curran, 

 J. K. Cochran, D. M. DeMaster, L. K. Benninger and 

 G. Paoia. 



