Evaluation on the fitness and population projection of Nilaparvata lugens in response to elevated CO2 using two-sex life table

摘要

The life history and fitness of Nilaparvata lugens being reared under ambient level (current CO2 concentration), medially elevated (550 mu L/L) and highly elevated (750 mu L/L) CO2 concentration for long-term generation were compared using two-sex life table instead of traditional age-specific life table. The results showed that significantly longer larval duration and lower fecundity of N. lugens were observed in 750 mu L/L relative to 550 mu L/L treatment (P < 0.05). Accordingly, 550 mu L/L CO2 significantly enhanced population parameters of N. lugens, including significantly higher intrinsic rate of increase (r), finite rate (lambda) and net reproductive rate (R-O), but not for 750 mu L/L CO2. Taken together, N. lugens performs enhanced development rate, fecundity and survival in individual life history and higher potential in population multiplication under 550 mu L/L CO2 level, while only indicates the less enhanced development rate and survival without significant increased capacity of population expansion under 750 mu L/L CO2 level. These results should facilitate predicting the fitness and potential population damage of N. lugens, which is valuable for the integrated control of N. lugens in the future increasing CO2 concentration.