Fig. 2. Variations in CH4 and CO2 concentrations with time in the chamber headspace at the ① reference site, and ② Macrophthalmus japonicus and ③ Laomedia astacina burrows; and the CH4 emission rates [by the equation, slope (ppm hr-1)×(chamber volume m3/surface area m2), with correction for the barometric pressure and air temperature] calculated by reference to the initial slope at each site.
Fig. 3. Variations in CO2 concentrations by differences between decapods and reference sites.
Fig. 4. Isotope tracking of the CO2 sources at the L. astacina burrow site in chamber headspace.
Fig. 1. (a) Map showing the chamber experiment site in a tidal flat of Cheonsu Bay, (b) chamber experiment with a diffuse CH4/CO2 flux meter, and (c) gas sampling through a vent using the vacutainer.
Table 1. Proportions of methanogens and methanotrophs in burrow wall sediments and the surface sediment of the reference site, together with the proportions of Candidatus methylomirabilis group bacteria among the methanotrophs (in parentheses)
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