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journal1 ›› 2019, Vol. 35 ›› Issue (2): 191-196.DOI: 10.16409/j.cnki.2095-039x.2019.02.011

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Inbreeding Depression in Captive-raised Arma chinensis

MIAO Shaoming1, LIAO Ping1,2, YE Min2, MAO Jianjun1, WANG Mengqing1, ZHANG Lisheng1, CHEN Hongyin1, LIU Chenxi1   

  1. 1. State Key Laboratory for Biology of Plant Diseases and Insect Pests/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. College of Plant Protection, Southwest University, Chongqing 400715, China
  • Received:2018-12-07 Online:2019-04-08 Published:2019-04-12

Abstract: Arma chinensis is an excellent predator that can prey on more than 40 species of lepidoptera, coleoptera and hymenoptera pests. At present, A. chinensis are mostly reared in insectary, which can result in inbreeding depression. A series of life characteristics of A. chinensis population in inbreeding condition were determined, which can support insectary rearing of the predator. A. chinensis populations were inbred or outbred continuously in the insectary, and the differences between the inbred and outbred populations in egg hatching rate, developmental duration of nymphal stages, body weight and sex ratio in the sixth generation were analyzed. Compared with those of the outbred population, egg hatching rate of the inbred population (43.66%) was 22.62% lower, egg hatching duration was 1.7 days longer. Developmental duration of each instar and the nymphs of the inbred population was marginally different from that of the outbred population. No significant difference was observed in weight between the outbred and inbred A. chinensis. The inbred population was significantly male-biased in comparison with the outbred population. Overall, the inbred population was significantly inferior to the outbred population in egg hatching rate and adult acquisition rate, while there was no significant difference in developmental duration and body weight. Therefore, outbreeding A. chinensis should be supplemented into the insectary rearing A. chinensis population to avoid inbreeding depression.

Key words: Arma chinensis, inbred lines, production, depression

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