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Journal of Experimental Biology 134,363-376 (1988)
Published by Company of Biologists 1988

Discontinuous CO₂ Emission in a Small Insect, the Formicine Ant Campoxotus Vicixus

JOHN R.B. LIGHTON ¹

¹ Department of Biology, University of California Los Angeles, Los Angeles, CA 90024, USA

Standard rates of oxygen consumption (VO₂) and CO₂ production (VCO₂) were measured by constant-volume respirometry in the formicine ant, Camponotus vicinus Mayr, at temperatures ranging from 10 to 40°C. Over this range, the Q₁₀ with regard to VO₂ was 1.79, and with regard to VCO₂, 1.84. Multiple regression equations relating VO₂ and VCO₂ of inactive ants to mass (0016-0088g) and temperature were calculated. Periodic CO₂ emissions (‘bursts’) were monitored with flow-through respirometry. Burst frequency increased exponentially with temperature (Q₁₀ = 3.05), from 814h^-1at 15°C to 81.4h^-1 at 35°C, and was not significantly correlated with body mass over the mass range (0041-0086g) investigated. Burst volume, which could be accurately measured in one ant, decreased with temperature (Q₁₀ = 0.61). thus yielding the observed VCO₂ Q₁₀ of 1.84.

Key words: discontinuous ventilation, insect ventilation, intermittent CO₂ emission

Accepted on July 21, 1987

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