Zhang Yan-Kai, Yang Kun, Zhu Yu-Xi, Hong Xiao-Yue
Department of Entomology Nanjing Agricultural University Nanjing China.
College of Life Sciences Hebei Normal University Shijiazhuang China.
Ecol Evol. 2018 Jan 3;8(3):1626-1633. doi: 10.1002/ece3.3784. eCollection 2018 Feb.
Double infections of and are frequent in natural populations of , a polyphagous mite species that has been a dominant species in China since 2009. However, little is known about the causes and ecological importance of such coexistences. In this study, we established strains with different infection types and then inferred the impact of the two endosymbionts on host reproduction and fitness. Double infection induced cytoplasmic incompatibility, which was demonstrated by reduction in egg hatchability of incompatible crosses. However, doubly infected females produced more eggs relative to other strains. and did not affect host survival, whereas doubly infected females and males developed faster than other strains. Such reproduction and fitness benefits provided by double infections may be associated with the lower densities of each symbiont, and the quantitative results also confirmed competition between and in doubly infected females. These symbiont-conferred beneficial effects maintain stable prevalence of the symbionts and also help drive outbreaks in combination with other environmental factors.
在中国自2009年以来一直占主导地位的多食性螨类物种——[螨类物种名称未给出]的自然种群中，[两种共生菌名称未给出]的双重感染很常见。然而，对于这种共存的原因和生态重要性知之甚少。在本研究中，我们建立了具有不同感染类型的菌株，然后推断这两种内共生菌对宿主繁殖和适合度的影响。双重感染诱导了细胞质不亲和性，这通过不相容杂交的卵孵化率降低得到证明。然而，相对于其他菌株，双重感染的雌性产生了更多的卵。[两种共生菌名称未给出]不影响宿主存活，而双重感染的雌性和雄性比其他菌株发育得更快。双重感染所带来的这种繁殖和适合度益处可能与每种共生菌的较低密度有关，定量结果也证实了双重感染雌性中[两种共生菌名称未给出]之间的竞争。这些共生菌赋予的有益效应维持了共生菌的稳定流行率，并且与其他环境因素一起也有助于推动[螨类物种名称未给出]的爆发。
