| To investigate the indirect effects of elevated atmospheric CO2 concentration on invasive thrips Frankliniella occidentalis and the local related species F. intonsa, developmental period of immature stage, survival rate, reproduction and population parameters of the two thrips species were measured under two atmospheric CO2 concentrations (800 μL/L vs. 400 μL/L) in artificial climate chamber. The results indicated that, at doubled CO2 concentration (800 μL/L), the developmental durations of immature stage of F. occidentalis and F. intonsa were significantly shortened; the cumulative survival rate of F. intonsa decreased 26.30% (P<0.05), while it showed no significant difference for F. occidentalis; the fecundity of female F. occidentalis increased 10.93%, while female lifespan decreased 1.31 d, the average fecundity and daily eggs laid by individual female of F. intonsa decreased 4.83 and 0.56 eggs, respectively (P<0.05）. The net reproductive rate (R0), intrinsic increase rate (rm), increase rate per unit (λ) of F. occidentalis under high CO2 concentration were significantly higher than those under normal CO2 concentration (400 μL/L), with the generation time (T) and time of double population size (t) of this thrips significantly decreased. However, R0, rm, and λ ofF. intonsa, on the other hand, significantly decreased, with T and t of this thrips increased (P<0.05）. At the same CO2 concentration, immature stage of F. occidentalis was shorter than that of F. intonsa, survival rate of different development stages of the two thrips species showed the same order as: pupal>pre-pupal>2nd instar nymph>1st instar nymph.In conclusion,F. occidentalis might be more adaptable than F. intonsa under future CO2-enriched environments. |
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