In order to verify the escape‐from‐enemy hypothesis from the changes of nutrient substance and fitness of natural enemies on alien plants, contents of free amino acids in native and invasive plant populations of Ageratina adenophora and life history parameters of specialist herbivore Procecidochares utilis reared on these plants were investigated. Our results showed that the contents of glycine, valine, γ‐aminobutyric acid, proline, serine, alanine, and arginine in the invasive plants were higher than those in the native plants of A. adenophora. There was a shorter developmental duration and higher fecundity of P. utilis when fed on the invasive plants. The results indicated a possible fitness tradeoff of natural enemies between invasive and native plants arose from nutrient substance changes.

中文翻译：

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入侵杂草紫茎泽兰的游离氨基酸含量增加及其对专用草食动物Procecidochares utilis的影响

为了验证从营养物质和外来植物天敌健身的变化转义从敌人的假设，在本土和外来入侵植物种群的游离氨基酸含量紫茎泽兰专家和生活史参数食草动物泽兰实蝇饲养的对这些植物进行了调查。我们的结果表明，入侵植物中甘氨酸，缬氨酸，γ-氨基丁酸，脯氨酸，丝氨酸，丙氨酸和精氨酸的含量均高于紫茎泽兰的天然植物。P. utilis的发育时间较短，繁殖力较高。当以入侵植物为食时。结果表明，由于营养物质的变化，入侵者和本地植物之间可能存在天敌的适应性折衷。