Female bias in an immigratory population of Cnaphalocrocis medinalis moths based on field surveys and laboratory tests

文献类型： 外文期刊

第一作者： Guo, Jia-Wen

作者： Guo, Jia-Wen;Yang, Fan;Li, Ping;Liu, Xiang-Dong;Wu, Qiu-Lin;Hu, Gao;Zhai, Bao-Ping;Yang, Fan;Wu, Qiu-Lin

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2019 年 9 卷

页码：

收录情况： SCI

摘要： Sex ratio bias is common in migratory animals and can affect population structure and reproductive strategies, thereby altering population development. However, little is known about the underlying mechanisms that lead to sex ratio bias in migratory insect populations. In this study, we used Cnaphalocrocis medinalis, a typical migratory pest of rice, to explore this phenomenon. A total of 1,170 moths were collected from searchlight traps during immigration periods in 2015-2018. Females were much more abundant than males each year (total females: total males= 722:448). Sex-based differences in emergence time, take-off behaviour, flight capability and energy reserves were evaluated in a laboratory population. Females emerged 0.78 days earlier than males. In addition, the emigratory propensity and flight capability of female moths were greater than those of male moths, and female moths had more energy reserves than did male moths. These results indicate that female moths migrate earlier and can fly farther than male moths, resulting more female moths in the studied immigratory population.

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