Abstract
1. 1. Oxygen consumption of diet-reared Manduca sexta larvae changes in a repeated and predictable pattern during development of each stadium. 2. 2. The first four instars of unparasitized larvae respire as a direct function of their weight, slope = 1. 3. 3. The highly significant deviation from a slope of 1 (slope ⩽ 2 3 ) found in the fifth stadium is attributed to the production of low-metabolizing tissue by the developing larvae. 4. 4. Parasites have a damping effect on the normal cycle of O 2 consumption with active feeding phases consuming less and inactive phases (during apolysis and ecdysis) consuming more O 2 than expected.
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