Nutrient-dependent patterns in the sex ratio of Ovomermis sinensis (Nematoda: Mermithidae), a biological control agent of Helicoverpa armigera (Lepidoptera: Noctuidae)
Nutrient-dependent patterns in the sex ratio of Ovomermis sinensis (Nematoda: Mermithidae), a biological control agent of Helicoverpa armigera (Lepidoptera: Noctuidae)
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棉铃虫生物防治剂中华卵蝇（线虫纲：夜蛾科）性别比例的营养依赖性模式（鳞翅目：夜蛾科）
DOI：
10.1080/09583157.2016.1184621
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发表时间：
2016-01-01
影响因子：
1.4
通讯作者：
Wang, Guoxiu
中科院分区：
文献类型：
--
作者：
Jiao, Zhenlong;Feng, Xufei;Wang, Guoxiu
中华卵索线虫（Ovomermis sinensis，Nematoda：Sermithidae）是一种嗜虫线虫，是鳞翅目害虫（包括棉铃虫Helicoverpa armigera）的潜在生防因子。一个物种的性别比例可以用来调节繁殖种群的大小。通过对寄生量、寄生期、寄主龄期和虫体大小的测定，分析了影响该虫寄生的因素。中华绒螯蟹性比我们检验了O.中华绒螯蟹性比与寄主营养供应和线虫对营养的吸收有关。结果表明，雄性O.中华绒螯蟹的寄生量随寄主龄期和个体大小的增加而增加，但随寄主龄期和个体大小的增加而减少。雄虫的寄生期明显短于雌虫。然而，所有的因素（主机和线虫）影响的性别比例显着修改限制主机的饮食，这增加了男性的比例。反过来，吸收较少营养的幼鱼往往会发育成雄性。总之，我们的研究结果表明，影响O。性比与寄主营养状况有关，可为该天敌大量饲养和释放策略提供参数。
ABSTRACT Ovomermis sinensis (Nematoda: Mermithidae) is an entomophilic nematode and a potential biocontrol agent of lepidopteran pests, including Helicoverpa armigera. The sex ratio of a species can be used to regulate the size of the reproductive population. Parasitic load, parasitic period, host instar, and body size were examined to identify factors affecting the O. sinensis sex ratio. We tested the hypothesis that the O. sinensis sex ratio is correlated with host nutrient supply and the nutrients absorbed by the nematodes. The results show that the proportion of male O. sinensis increased with parasitic load but decreased with host instars and body size. Moreover, the parasitic period of males was significantly shorter than that of females. However, all the factors (host and nematodes) affecting the sex ratio were significantly modified by restricting the host diet, which increased the proportion of males. In turn, juveniles that absorbed fewer nutrients tended to develop into males. Taken together, our findings suggest that factors impacting the O. sinensis sex ratio are related to host nutrient status and provide parameters for mass rearing and a release strategy for this natural enemy.