Demography and population fitness traits of Spodoptera frugiperda (Lepidoptera: Noctuidae) under elevated temperature and CO 2 levels

摘要

The demography and population fitness of fall armyworm, Spodoptera frugiperda was studied by comparing ambient (31 degrees C + 415 ppm) with elevated (33 degrees C + 460 ppm and 35 degrees C + 520 ppm) environmental conditions. The experiments with temperature and CO2 levels were conducted by using Soil Plant Atmosphere Research (SPAR) chamber. The life history data of S. frugiperda was analyzed by age-stage, two-sex life table. Results revealed that developmental time and age-stage-specific survival rate (s(xj)) of S. frugiperda at age (x) and stage (j) reduced with the increase in temperature and CO2 levels. The fecundity rate and age-stage-specific reproductive rate (v(xj)) at age x and stage j were recorded highest at 33 degrees C + 460 ppm but it was significantly reduced at 35 degrees C + 520 ppm. S. frugiperda reared under an elevated level of 33 degrees C + 460 ppm showed the highest net reproductive rate (R-0), intrinsic (r(m)), and finite rate of increase (lambda) when compared to ambient. However, these fitness traits decreased at the elevated level of 35 degrees C + 520 ppm. These results suggest that the fitness traits of S. frugiperda were altered concerning the future scenario of global climate change under increasing temperature and CO2 levels.