Figure 1

Map of Effingham Inlet displaying sampling Sites 1 and 2. The water column at sampling Site 1 (called the anoxic site in the text) is anoxic below a depth of 65 m. Waters at Site 2 (referred to as the oxic site in the text) contain oxygen at the sediment-water interface. The inset map shows the relation of Effingham Inlet to Barkley Sound on the west coast of Vancouver Island.