A cold high-pressure system over North China hinders the southward migration of Mythimna separata in autumn

Movement Ecology

Research

Jie Liu¹  Yuying Jiang¹  Xiao Chen²  Fajun Chen³  Baoping Zhai³  Jason W. Chapman⁴  Hui Chen⁵  Jian Zhu⁵  Gao Hu⁵  Jiahao Lu⁶  Don R. Reynolds⁷ 

[1] China National Agro-Tech Extension and Service Center, 100125, Beijing, China;College of Life Science, International Cooperative Research Centre for Cross-Border Pest Management in Central Asia, Xinjiang Normal University, 830054, Urumqi, China;Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, 210095, Nanjing, China;Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, 210095, Nanjing, China;Centre of Ecology and Conservation, and Environment and Sustainability Institute, University of Exeter, TR10 9FE, Penryn, Cornwall, UK;Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, 210095, Nanjing, China;State Key Laboratory of Biological Interactions and Crop Health, Nanjing Agricultural University, 210095, Nanjing, China;Department of Entomology, Nanjing Agricultural University, 1 Weigang Road, 210095, Nanjing, China;State Key Laboratory of Biological Interactions and Crop Health, Nanjing Agricultural University, 210095, Nanjing, China;Songjiang District Agro-Technology Extension Center, 201613, Shanghai, China;Natural Resources Institute, University of Greenwich, ME4 4TB, Chatham, UK;Rothamsted Research, AL5 2JQ, Harpenden, UK;

关键词: Insect migration;    East Asian monsoon;    Wind pattern;    Population dynamics;    Lepidoptera;   

DOI  :  10.1186/s40462-022-00360-3

 received in 2022-06-06, accepted in 2022-11-29,  发布年份 2022

来源: Springer

【 摘 要 】

BackgroundIn warm regions or seasons of the year, the planetary boundary layer is occupied by a huge variety and quantity of insects, but the southward migration of insects (in East Asia) in autumn is still poorly understood.MethodsWe collated daily catches of the oriental armyworm (Mythimna separata) moth from 20 searchlight traps from 2014 to 2017 in China. In order to explore the autumn migratory connectivity of M. separata in East China, we analyzed the autumn climate and simulated the autumn migration process of moths.ResultsThe results confirmed that northward moth migration in spring and summer under the East Asian monsoon system can bring rapid population growth. However, slow southerly wind (blowing towards the north) prevailed over the major summer breeding area in North China (33°–40° N) due to a cold high-pressure system located there, and this severely disrupts the autumn ‘return’ migration of this pest. Less than 8% of moths from the summer breeding area successfully migrated back to their winter-breeding region, resulting in a sharp decline of the population abundance in autumn. As northerly winds (blowing towards the south) predominate at the eastern periphery of a high-pressure system, the westward movement of the high-pressure system leads to more northerlies over North China, increasing the numbers of moths migrating southward successfully. Therefore, an outbreak year of M. separata larvae was associated with a more westward position of the high-pressure system during the previous autumn.ConclusionThese results indicate that the southward migration in autumn is crucial for sustaining pest populations of M. separata, and the position of the cold high-pressure system in September is a key environmental driver of the population size in the next year. This study indicates that the autumn migration of insects in East China is more complex than previously recognized, and that the meteorological conditions in autumn are an important driver of migratory insects’ seasonal and interannual population dynamics.

【 授权许可】

CC BY   
© The Author(s) 2022

【 图 表 】

12982_2022_119_Article_IEq231.gif

12982_2022_119_Article_IEq224.gif

12888_2022_4482_Article_IEq3.gif

12982_2022_119_Article_IEq83.gif

12982_2022_119_Article_IEq79.gif