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Figure S1. Diagram of the gas trap sampler used to measure whole ecosystem methane emission (ME).

Figure S2. Example of field measurements of methane efflux (ME) from mesocosm 1 (June 2007) to the atmosphere. After approximately 7 h ME reaches an asymptote (dashed line). This might be an artefact of the gas trap enclosure and artificial changes in partial pressure and&sol;or temperature, but may also include a decline in photosynthesis and gas transfer through the aerenchyma in early afternoon as photosynthesis declines. As a result the shortest possible time (typically 1 h) to generate a significant (P<0.05) flux (insert) was used for determination of flux rates.

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