Respiration Rate of Steinernema feltiae Infective Juveniles at Several Constant Temperatures
Abstract
Respiration was measured in dauer stages of the insect-parasitic nematode Steinernema feltiae (= Neoaplectana carpocapsae) at 7, 17, and 27 C. Respiration, Q[sub1][sub0], and nematode viability were temperature dependent. Mean O[sub2] consumption for 5 × 10[sup5] nematodes the first 24 hours was 0.27 ml at 7 C, 0.83 ml at 17 C, and 2.68 ml at 27 C. The Q[sub1][sub0] was 3.10 for 7-17 C and 3.24 for 17-27 C. Some nematodes died during 2, 14, and 21 days at 27, 17, and 7 C, respectively. The respiratory quotient was below 1 at all temperatures tested. A standard asymptotic model is expressed as oxygen consumed = 2.77 * {1 - exponent[-time * exponent(-B + C * temperature)]ø; where 2.77 is the maximum response at 27 C. This model estimates nematode O[sub2] consumption and viability at storage temperatures between 7 and 27 C. The nematodes died when the O[sub2] concentration reached 0.5 ml/5 × 10[sup5] nematodes. This model may be used to predict O[sub2] requirements of S. feltiae infective juveniles when stored as a waterless concentrate. Key words: carbon dioxide, infective juveniles, mortality, Neoaplectana carpocapsae, oxygen consumption, physiology, Qa0, respiration, standard asymptotic model, Steinernemafeltiae, temperature, viability, biocontrot.Downloads
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