Population fitness of the migratory brown planthopper, <em>Nilaparvata lugens</em> (Hemiptera: Delphacidae) in response to the change of geomagnetic field intensity
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ACTA ENTOMOLOGICA SINICA  2018, Vol. 61 Issue (8): 957-967    DOI: 10.16380/j.kcxb.2018.08.009
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Population fitness of the migratory brown planthopper, Nilaparvata lugens (Hemiptera: Delphacidae) in response to the change of geomagnetic field intensity
LIU Rui-Ying1, XIAO Zi-Jin1, HE Jing-Lan1, WAN Gui-Jun1, PAN Wei-Dong2, CHEN Fa-Jun1,*
(1. InsectInformation Ecology Laboratory, Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; 2. Beijing Key Laboratory of Bioelectromagetics, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China)
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Abstract 【Aim】 Organisms (including migratory insects) on the earth are constantly affected by the geomagnetic field (GMF). The migratory insects can have a long distance migration, and there is a perceptible difference in the GMF intensity between the emigration and immigration regions, which affects the population fitness of migratory insects. This study was carried out to clarify the magnetobiological effect on migratory insect populations so to help predict the occurrence of migratory insect pests. 【Methods】 The GMF intensities of the spring emigration (Guangzhou city, GMF 45 μT) and immigration (Nanjing city, GMF 50 μT) regions of the brown planthopper, Nilaparvata lugens, a migratory pest, were simulated by the DC-type helmholtz coils, respectively, and the changes in the growth, development and reproduction of N. lugens in response to the GMF intensity change between the emigration and immigration regions were investigated. 【Results】 The results showed that in the immigration region (GMF 50 μT), the egg duration of N. lugens was slightly shortened (0.50%), the egg hatching rate was significantly enhanced (6.11%), the developmental duration of female and male nymphs was lengthened by 5.26% and 2.37%, respectively, the body weight of the newly emerged female and male adults was increased by 0.66% and 9.56%, respectively, and the developmental duration of female and male adults was shortened by 35.34% and 26.15%, respectively, as compared with those in the emigration region (GMF 45 μT). Moreover, the fecundity of female adults was significantly enhanced (30.13%) and the relative transcription level of Vg was significantly enhanced (259.25%). Furthermore, compared with the GMF intensity 45 μT, the GMF intensity 50 μT significantly decreased the egg duration (2.52%) and significantly increased the egg hatching rate (10.83%) of the F1 generation of N. lugens. 【Conclusion】 The results suggest that the GMF intensity of the region where N. lugens is located after northward migration in spring is positive for its migration to enhance the population fitness, further advantageous for the population occurrence and increasing the risk of population outbreak and damage in the immigration regions in spring.
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LIU Rui-Ying
XIAO Zi-Jin
HE Jing-Lan
WAN Gui-Jun
PAN Wei-Dong
CHEN Fa-Jun
Key wordsNilaparvata lugens; geomagnetic field intensity   migratory insect   emigration   immigration   magnetobiological effect     
Cite this article:   
LIU Rui-Ying,XIAO Zi-Jin,HE Jing-Lan et al. Population fitness of the migratory brown planthopper, Nilaparvata lugens (Hemiptera: Delphacidae) in response to the change of geomagnetic field intensity[J]. ACTA ENTOMOLOGICA SINICA, 2018, 61(8): 957-967.
URL:  
http://www.insect.org.cn/EN/10.16380/j.kcxb.2018.08.009      or     http://www.insect.org.cn/EN/Y2018/V61/I8/957
 
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