Migratory Take-Off Behaviour of the Mongolian GrasshopperOedaleus asiaticus

文献类型： 外文期刊

第一作者： Wang, Yun-Ping

作者： Wang, Yun-Ping;Lin, Pei-Jiong;Chapman, Jason;Hu, Gao;Tu, Xiong-Bing;Li, Shuang;Xu, Chao-Min;Zhang, Ze-Hua;Wang, Xin-Qiao;Reynolds, Don R.;Reynolds, Don R.;Chapman, Jason;Chapman, Jason

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关键词： Oedaleus asiaticus; take off; insect migration; weather conditions; inner Mongolia

期刊名称：INSECTS （ 影响因子：2.769； 五年影响因子：3.046 ）

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年卷期： 2020 年 11 卷 7 期

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收录情况： SCI

摘要： Oedaleus asiaticusis one of the dominant species of grasshoppers in the rangeland on the Mongolian plateau, and a serious pest, but its migratory behavior is poorly known. We investigated the take-off behavior of migratoryO. asiaticusin field cages in the inner Mongolia region of northern China. The species shows a degree of density-dependent phase polyphenism, with high-density swarming populations characterized by a brown morph, while low-density populations are more likely to comprise a green morph. We found that only 12.4% of brown morphs engaged in migratory take-off, and 2.0% of green morphs. Migratory grasshoppers took off at dusk, especially in the half hour after sunset (20:00-20:30 h). Most emigrating individuals did not have any food in their digestive tract, and the females were mated but with immature ovaries. In contrast, non-emigrating individuals rarely had empty digestive tracts, and most females were mated and sexually mature. Therefore, it seems clear that individuals prepare for migration in the afternoon by eliminating food residue from the body, and migration is largely restricted to sexually immature stages (at least in females). Furthermore, it was found that weather conditions (particularly temperature and wind speed at 15:00 h) in the afternoon had a significant effect on take-off that evening, withO. asiaticuspreferring to take off in warm, dry and calm weather. The findings of this study will contribute to a reliable basis for forecasting migratory movements of this pest.

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