Abstract
We investigated the effect of dissolved organic carbon (DOC) on hypolimnetic metabolism (accumulation of dissolved inorganic carbon (DIC) and methane (CH4)) in 21 lakes across a gradient of DOC concentrations (308 to 1540 mol CL �1 ). The highly colored nature of the DOC in these lakes suggests it is mostly of terrestrial origin. Hypolimnetic methane accumulation was positively correlated with epilimnetic DOC concentration (Spearman rank correlation = 0.67; p 800 mol L �1 were completely anoxic and often had high CH4 concentrations. Thus, DOC affects hypolimnetic metabolism via multiple pathways: DOC was significant in supporting hypolim- netic metabolism; and at high concentrations depressed photosynthesis (and therefore oxygen produc- tion and DIC consumption) in the hypolimnion.
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