Table 2.

Pool sizes of selected metabolites in the different gut sections of Cubitermes spp. and the injected amounts of the corresponding radiolabeled tracersa

MetabolitePool size (nmol section−1)bInjected amt
C. umbratusC. orthognathusnmolBq
P1 (1.55 ± 0.23 μl)P3/4a (0.97 ± 0.16 μl)P4b (0.32 ± 0.16 μl)P1 (0.76 ± 0.19 μl)P3/4a (0.54 ± 0.15 μl)P4b (0.12 ± 0.02 μl)
Acetate6.80 ± 0.395.86 ± 0.680.73 ± 0.063.30 ± 0.073.83 ± 0.060.35 ± 0.120.2161
CO2 c 26.0 ± 1.522.4 ± 0.313.2 ± 2.113.1 ± 0.911.0 ± 0.26.9 ± 1.11.50315
Formate0.03 ± 0.03<0.010.06 ± 0.05<0.010.09 ± 0.08<0.010.17340
  • a The average volume of the sections (given in parentheses above) was determined by geometric approximation. A complete data set including all metabolites will be published elsewhere (36). For definitions of the sections, see Fig. 1in the companion paper (33).

  • b Values are means (± standard deviations) of three independent values, determined as described elsewhere (35).

  • c Total dissolved inorganic C (CO2plus HCO3 plus CO3 2−).