Response of three successive generations of aphids to stress from Lysiphlebia japonica Ashmead under ambient CO2 and elevated CO2
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Key Words：Aphis gossypii, Lysiphlebia japonica, elevated CO2, fitness, stress, three successive generations
Abstract：The effects of two levels of CO2 (375 μL/L VS 750 μL/L) on the cotton Aphis gossypii Lysiphlebia japonica system were studied using OTCs. We evaluated the influence of direct and indirect stress from L. japonica on the fitness response of aphids to changing CO2 for three successive generations. We wished to show whether CO2 levels, generation and L. japonicastress markedly determined the fecundity, net reproduction, mean generation time and intrinsic rate of increase in cotton aphids, and whether interactions between these variables also had a notable impact on the fecundity, net reproduction, and intrinsic rate of increase of aphids. Our results suggest that the stress induced by exposure to caged L. japonica had greater impact on the fitness and population dynamics of successive generations of A. gossypii under elevated CO2, resulting in a lower aphidpopulation.