Eight whole sediment samples from Antarctica (four from Winter Quarters Bay and four from McMurdo Sound) were toxicologically and chemically evaluated, Also, the influence of ultraviolet radiation on the toxicity and bioavailability of contaminants associated with the sediment samples was assessed, The evaluations were accomplished by use of a 10-day whole sediment test with Leptocheirus plumulosus, Microtox(R), Mutatox(R) and semipermeable membrane devices (SPMDs), Winter Quarters Bay sediments contained about 250 ng g(-1) (dry weight) total PCBs and 20 mu g g(-1) total PAHs. These sediments elicited toxicity in the Microtox test and avoidance and inhibited burrowing in the L. plumulosus test, The McMurdo Sound sediment samples contained only trace amounts of PCBs and no PAHs, and were less toxic in both the L. plumulosus and Microtox tests compared to the Winter Quarters Bay sediments, The sediments from McMurdo Sound apparently contained some unidentified substance which was photolytically modified to a more toxic form, The photolytic modification of sediment-associated contaminants, coupled with the polar ozone hole and increased incidence of ultraviolet radiation could significantly increase hazards to Antarctic marine life.
