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Tracing dietary origins of aphids and the predatory beetle Propylea japonica in agricultural systems using stable isotope analyses

文献类型： 外文期刊

作者： Ouyang, Fang 1 ; Cao, Jing 1 ; Liu, Xianghui 1 ; Men, Xingyuan 3 ; Zhang, Yongsheng 1 ; Zhao, Zihua 1 ; Ge, Feng 1 ;

作者机构： 1.Chinese Acad Sci, Inst Zool, State Key Lab Integrated Management Pest & Rodent, Beijing 100101, Peoples R China

2.Hunan Agr Univ, Coll Plant Protect, Changsha 410128, Hunan, Peoples R China

3.Shandong Acad Agr Sci, Inst Plant Protect, Jinan, Peoples R China

关键词： wheat;maize;cotton;Coleoptera;Coccinellidae;Hemiptera;Aphididae;trophic level;food chain;food web;nutritional ecology

期刊名称：ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA （ 影响因子：2.25； 五年影响因子：2.184 ）

ISSN：

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收录情况： SCI

摘要： Tracing dietary origins of the predatory beetle Propylea japonica (Thunberg) (Coleoptera: Coccinellidae) aids understanding their roles in the food web and provides information to develop strategies for effective conservation in agroecosystems comprised of wheat [Triticum aestivum L. (Poaceae)], cotton [Hirsutum spp. (Malvaceae)], and maize [Zea mays L. (Poaceae)]. Intrinsic markers of carbon and nitrogen stable isotope ratios (C-13 and N-15) in P.japonica need to be developed to ascertain the source(s) of diet. Experiments were carried out to examine the changes of C-13 and N-15 among the three crops, pests (wheat, cotton, and maize aphids; all Hemiptera: Aphididae), and P.japonica fed on aphids of each of the three crops. Results indicated that C-13 values in P.japonica fed on wheat, cotton, and maize aphids were -27.2 to -26.5 parts per thousand, -24.2 to -23.9 parts per thousand, and -11.0 to -10.7 parts per thousand, respectively, whereas their N-15 values were 1.1 to 2.9 parts per thousand, 6.0 to 7.4 parts per thousand, and -0.6 to 0.1 parts per thousand, respectively. C-13 and N-15 plots clearly identify the three crops, the dietary origins of the aphids, and the host origins of the aphid prey consumed by the ladybird beetles, as each pathway displays a non-overlapping pattern. Based on the values of C-13 and N-15 of the three food webs, dietary origins can be traced in the predatory beetle P.japonica derived from wheat, cotton, and maize crops.

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