Increased atmospheric CO₂ concentrations may directly affect insect behavior and physiology. Native and invasive insects may have different levels of adaptability to elevated CO₂. The invasive species Frankliniella occidentalis and the native species Thrips hawaiiensis are economically important pests. We determined the effects of elevated CO₂ on these pests by monitoring their development, survival, and oviposition under different CO₂ concentrations (400, 600, and 800 μl L⁻¹). We also determined detoxifying enzyme activities in larvae and adults. Frankliniella occidentalis and T. hawaiiensis showed faster development but lower survival rates as the CO₂ concentration increased. Fecundity significantly increased in F. occidentalis but decreased in T. hawaiiensis with increasing CO₂ concentrations. The net reproductive rate (R₀) and intrinsic rate of increase (r_m) were highest in F. occidentalis and lowest in T. hawaiiensis in the highest CO₂ treatment. At each CO₂ concentration, compared with T. hawaiiensis, F. occidentalis developed faster and had higher survival rate, fecundity, R₀, and r_m. The activities of detoxifying enzymes, except for acetylcholinesterase activity in second instars, increased in both species with increasing CO₂ concentrations. Carboxylesterase and glutathione S-transferase activities were always higher in F. occidentalis than in T. hawaiiensis. At each CO₂ concentration, carboxylesterase and acetylcholinesterase activities were higher in adults, but glutathione S-transferase activities were higher in larvae, indicative of different physiological responses between adults and larvae. In summary, elevated CO₂ benefited the population development of F. occidentalis but negatively affected that of T. hawaiiensis. This may be related to the activities of detoxifying enzymes.

大气中CO ₂浓度升高可能直接影响昆虫的行为和生理。天然和侵入性昆虫对提高的CO ₂适应性可能不同。入侵种西方富兰克氏菌和夏威夷本地蓟马是经济上重要的害虫。我们通过监测在不同CO ₂浓度（400、600和800μlL ^-1）下它们的发育，存活和产卵来确定CO ₂升高对这些害虫的影响。我们还确定了幼虫和成虫的解毒酶活性。西方富兰克氏菌和夏威夷T.表现出更快的发展，但随着CO ₂浓度增加，存活率降低。随着CO ₂浓度的增加，西洋参产卵的产卵量显着增加，而夏威夷产卵母细胞的产卵量却下降。在最高CO ₂处理下，西洋蓟马的净生殖率（R ₀）和内在增长率（r _m）最高，而夏威夷毛T鱼的最低。在每种CO ₂浓度下，与夏威夷海藻相比，西方海藻的生长速度更快，存活率，繁殖力，R ₀和r _m。除第二龄幼虫的乙酰胆碱酯酶活性外，排毒酶的活性均随CO ₂浓度的增加而增加。羧酸酯酶和谷胱甘肽S转移酶活动是始终高于西花蓟马比T. hawaiiensis。在每个CO ₂浓度下，成虫的羧酸酯酶和乙酰胆碱酯酶活性较高，而幼虫的谷胱甘肽S-转移酶活性较高，这表明成虫和幼虫之间的生理反应不同。总之，升高的CO _2有利于西花蓟马的种群发育但对夏威夷丁香的消极影响。这可能与排毒酶的活性有关。