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1 April 2005 Comparison of Respiration in Adult Harmonia axyridis Pallas and Hippodamia convergens Guerrin-Manaville (Coleoptera: Coccinellidae)
E. B. Acar, D. D. Mill, B. N. Smith, L. D. Hansen, G. M. Booth
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Abstract

Specific metabolic heat rates (Rq) and respiration rates (RCO2) of adult Harmonia axyridis Pallas, the multicolored Asian lady beetle, and Hippodamia convergens Guerrin-Manaville, the convergent lady beetle, were measured in isothermal calorimeters at 5°C intervals from 0 to 40°C. Anabolic rates and Rq/RCO2 ratios were calculated as functions of temperature from the calorespirometric data. The two species have similar heat and CO2 rates from 0 to 10°C, but both rates are higher for H. convergens at all other temperatures. Anabolic rates and Rq/RCO2 ratios indicated high-temperature stress in H. convergens at 40°C and at 35 and 40°C in H. axyridis. Anabolic rates and Rq/RCO2 ratios for the two species differed markedly from 15 to 30°C, where H. convergens had a higher anabolic rate and lower Rq/RCO2 ratio (i.e., greater metabolic efficiency) than H. axyridis. The data show that H. axyridis maximizes the anabolic rate, and therefore the biosynthesis rate, at low temperatures around 5°C and maximizes the catabolic rate at 25–30°C to support movement. In H. convergens, the optimum temperature range is the same for both biosynthesis (anabolic rate) and movement (catabolic rate), i.e., from 15 to 30°C. The ability of H. axyridis to more efficiently use periods of low temperature for development and reproduction and periods of mid-range environmental temperatures for searching for prey and feeding probably contribute to its competitive displacement of native North American coccinellid species.

E. B. Acar, D. D. Mill, B. N. Smith, L. D. Hansen, and G. M. Booth "Comparison of Respiration in Adult Harmonia axyridis Pallas and Hippodamia convergens Guerrin-Manaville (Coleoptera: Coccinellidae)," Environmental Entomology 34(2), 241-245, (1 April 2005). https://doi.org/10.1603/0046-225X-34.2.241
Received: 8 September 2004; Accepted: 1 December 2004; Published: 1 April 2005
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