TABLE 10.

Calculation of carbon flow via acetate to sulfate reduction, to methanogenesis, and in uncoupled processes in pond sediments of the McMurdo Ice Shelf incubated at temperatures below freezing

Pond	Temp (°C)	% Carbon flow via acetate:
		To CH4a	Coupled to sulfate reductionb	To CO2 (electron acceptor undefined)c
Orange	−10	8.0	2.6	89.4
Brack	−10	3.9	44.4	51.7

^aDetermined from the percentage of CH₄ accounted for by acetate × CH₄ production/rate of acetate dissimilation (data from Table 5).

^bDetermined from the percentage of sulfate reduction accounted for by acetate × sulfate reduction/rate of acetate dissimilation (data from Table 5).

^cCalculated as 100 − (% CH_{4 [ac]} + % SO₄²⁻_[ac]).