Food induced variation of thermal constants of development and growth of Autographa gamma (Lepidoptera: Noctuidae) larvae
2002
Honek, A. | Martinkova, Z. | Novak, I. (Vyzkumny Ustav Rostlinne Vyroby, Prague (Czech Republic)) | Jarosik, V.
The aim of the study was to test the hypothesis of "rate isomorphy" (RI) as a phenomenon of identical lower development threshold (LDT) and proportionally different durations in Autographa gamma larvae. The larvae were kept at 15.0, 20.3 and 26.7 deg C and fed on leaves of 13 dicotyledoneous herb and tree species. Proportion of the total development time spent on a particular diet significantly interacted with temperature and type of diet. At particular temperatures, the proportion significantly varied with diet. The LTD observed on 11 diets where the larvae completed development in at least 2 temperatures varied between 9.3 and 11.0 deg C while the sum of effective temperatures (SET) varied between 167 and 353 day degrees (dd). Assuming RI, LDT, and SET for those 9 diets were recalculated. The SET increased with decreasing water concentration and decreasing nitrogen concentration in food. Worsening food quality decreased food consumption, metabolic and food conversion efficiency, and the relative growth rate of the larvae. Increasing metabolic costs of development were thus positively correlated with SET. Pupal mass decreased with increasing temperature and, within each temperature, with development length.
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