Long-term shifts in abundance of (migratory) crop-feeding and beneficial insect species in northeastern Asia

文献类型： 外文期刊

第一作者： Guo, Jianglong

作者： Guo, Jianglong;Guo, Jianglong;Zhao, Shengyuan;Shen, Xiujing;Wyckhuys, Kris A. G.;Wu, Kongming;Fu, Xiaowei

作者机构：

关键词： Insect migration; Insect biodiversity; Biodiversity loss; Migratory pests; Aerobiology; Biological control

期刊名称：JOURNAL OF PEST SCIENCE （ 影响因子：5.918； 五年影响因子：5.955 ）

ISSN： 1612-4758

年卷期： 2020 年 93 卷 2 期

页码：

收录情况： SCI

摘要： Vast numbers of insects annually engage in trans-latitudinal migration and thereby impact structure and functioning of natural and man-made ecosystems. In eastern Asia, long-distance migration has historically been studied for single insect species rather than diverse species complexes. Here, we assessed migration dynamics of multiple economically important migratory species on an island in the Bohai Strait, China. Drawing upon 15-year trapping records of > 2.5 million specimens, we unveil inter- and intra-annual shifts in the species composition and abundance of migrant individuals. Migrants belonged to 9 orders and 36 families, primarily consisting of Lepidoptera (79% individuals), Odonata (8%), and Coleoptera (4%). Seven crop-feeding noctuids, e.g., Helicoverpa armigera (Hubner), Mythimna separata (Walker), represented 54% of the total trapping records. Trap catches exhibited marked seasonal variation, with the highest capture rate during early fall. Yearly abundance of migratory noctuids was coupled with that of their associated natural enemies. Although overall trap catches did not decrease over the monitoring period, the entire order of Odonata experienced a 14.1% annual rate of decline. Furthermore, 19 out of 108 species exhibited a progressively declining abundance over time, including the cosmopolitan cutworm Agrotis ipsilon (Hufnagel) and the insectivorous dragonfly Pantala flavescens Fabricius. Our work provides unprecedented insights into insect migration dynamics in eastern Asia, helps fine-tune forecasting and early-warning systems of crop pests, and thereby guides integrated pest management within local agro-landscapes. Also, a long-term tracking of migrant insect populations can shine light on the fate of (insect-mediated) ecosystem services and trophic dynamic processes at a macroscale.

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