Abstract
The role of hindgut microorganisms in the nutrition of stream detritivores was evaluated by examining the production, transport, and utilization of acetate derived from hindgut microbial fermentation. Incubations of detritivore hindguts demonstrated linear rates of acetate production in Tipula abdominalis and Pycnopsyche guttifer (i.e., 14.4 and 19.4 μmol/g hindgut, respectively). In T. abdominalis, in vivo transport of acetate from the hindgut proceeded rapidly with 45% of the hindgut acetate transported in 1 hr. Hemolymph acetate was rapidly metabolized (i.e., within 4 hr) to tricarboxylic acid cycle intermediates, indicating typical routes of aerobic respiratory metabolism. Overall, acetate produced within the hindguts of these detritivores could account for approximately 5-16% of larval respiratory demand.
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