数字农科院2.0

Effect of Diet and Metamorphosis on the Stable Isotopes of Ectropis grisescens (Lepidoptera: Geometridae)

文献类型： 外文期刊

作者： Syed Abdul Wadood;Xin Li;Hanyi Mei;Farzeen Asghar;Chunlin Li;Karyne M Rogers;Jing Nie;Shengzhi Shao;Wahab Ali Khan;Meijun Tang;Yuwei Yuan

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关键词： Ectropis grisescens;metamorphosis;stable isotopes;tea plant;trophic discrimination factor

期刊名称： Rapid Communications in Mass Spectrometry

ISSN： 1097-0231

年卷期： 2025 年 40 卷 1 期

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收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Rationale: Light stable isotopes (δ13C, δ15N, δ2H, and δ18O) of Ectropis grisescens (Lepidoptera: Geometridae), a destructive tea leaf-eating pest, were measured at different developmental stages. Isotope values of larval instars, pupae, and adult moth body tissues were determined to understand fractionation patterns at different life stages and to evaluate dietary isotopic change from food to insect to excrement. Methods: Young Ectropis grisescens larvae (collected before the first instar) were raised on Camellia sinensis tea leaves (Yingshuang cultivar) under controlled conditions at the Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China. The two different tea leaf types were used to investigate trophic discrimination effects from consumer–diet responses and metamorphosis on Ectropis grisescens. Results: Ectropis grisescens δ13C body tissue values were significantly more positive relative to its diet at different larval stages, whereas feces were generally more negative compared to dietary resources. Similarly, δ15N values of the body tissues at different larval stages were significantly more positive compared to its diet. This 15N trophic discrimination was most likely due to available protein quality because both insufficient protein and a high dietary protein intake have the potential to enrich the 15N of bulk body tissues through catabolysis or increased protein turnover. The δ2H and δ18O values of pest body tissues also showed significant differences compared to diet. A trophic-related 2H and 18O decrease from early to late larval instars is seen, with an overall net decrease in δ2H and δ18O values from plant to the adult Ectropis grisescens. Conclusion: Metamorphosis (pupae to moth) of Ectropis grisescens affected all stable isotopes, with δ13C, δ15N, and δ2H values increasing, whereas δ18O values showed a marked decrease from pupae to moth tissue.

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