Table 4.

Comparison of the relative contributions of methanogenesis and homoacetogenesis to the overall electron flow in a soil-feeding termite and a wood-feeding termite

ParameterResult fora:
Cubitermes orthognathusReticulitermes flavipes
Rate (μmol g−1 h−1)Electron flow (%)bRate (μmol g−1 h−1)Electron flow (%)
Respiration rate (CO2 formation); In vivo3.68 (36)15.90 (27)
Methanogenesis; In vivo0.158 (33)8.60.116 (16)1.5
Homoacetogenesis
 In situ0.018c 1.00.833 (35)10.5
 In situ + exogenous H2 0.141c 7.70.855 (35)10.8
  • a References are given in parentheses.

  • b Calculated from respiratory CO2formation, assuming organic substrates with an average oxidation state of zero.

  • c Calculated from the combined rates of the individual compartments (Table 3).