TABLE 3.

Gut volume and total concentrations of fermentation products (converted to glucose equivalents) and dissolved inorganic carbon (ΣCO₂) in midgut and hindgut of the three instars of P. ephippiata larvae^a

Larval instar	Vol (μl)			Fermentation productsb (mM)			ΣCO2c (mM)
	Midgut	Hindgut	n	Midgut	Hindgut	n	Midgut	Hindgut	n
1	18 ± 1	14 ± 1	14	2.6 ± 0.6	1.4 ± 0.2	5	41 ± 11	27 ± 7	5
2	71 ± 9	74 ± 7	17	7.0 ± 2.7	6.2 ± 1.9	6	32 ± 8	24 ± 4	5
3	543 ± 43	398 ± 26	23	6.8 ± 1.3	7.5 ± 3.2	11	46 ± 8	23 ± 2	5

^aValues are means ± standard errors for n different larvae.

^bBased on the number of reducing equivalents released upon formal oxidation to CO₂.

^cTotal dissolved inorganic carbon (CO₂ plus HCO₃⁻ plus CO₃²⁻).