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Investigations into the effects of the heavy metal cadmium (Cd) and low pH upon methanogenesis from anaerobic lake sediments were conducted over the period summer 1978 to early spring 1981 at the Freshwater Institute, Winnipeg, and at the Experimental Lakes Area (ELA), north-western Ontario. Experiments conducted at ELA consisted of both laboratory and field studies, while those at the Institute consisted of developmental and test laboratory studies.