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Analysis of cores from a continuously oiled beach shows that seven-year-old stranded Bunker C fuel oil re-entering the beach substrate is rapidly degraded. This weathering occurs throughout the top 15 cms of the beach sediments. The aromatic and cyclo-alkane components, however, appear resistant and unaltered. Thus the beach sediments act as effective n-alkane filters, but simultaneously become enriched with aromatic hydrocarbons. Bivalves from these oiled sediments, and from other non-oiled areas, were assayed for their ability to degrade aromatic hydrocarbons, and for their ability to respond to oil exposure by induced elevated levels of aryl hydrocarbon hydroxylase (AHH). Both non-oiled Mya arenaria, Mytilus edulis, and Ostrea edulis esposed to aquenous extracts of Kuwait crude and a Bunker C fuel oil, and M. arenaria and M. edulis from Arrow Bunker C oiled sediments lacked the AHH system, as shown by their inability to hydroxylate benzo(a)pyrene or demethylate 14C-imipramine. Discussion is centered on the implications of this metabolic inability to degrade aromatic hydrocarbons in bivalves residing in aromatic enriched sediments.

PERSISTENCE OF NON-ALKANE COMPONENTS OF BUNKER C OIL IN BEACH SEDIMENTS OF CHEDABUCTO BAY, AND LACK OF THEIR METABOLISM BY MOLLUSCS.