鸟类宿主对西尼罗河病毒传播能力的种间差异性及影响因素

Birds’Interspecific Variation in Host Competence for West Nile Virus and Their Driving Factors

宿主物种对特定病原的传播能力通常具有明显的种间差异性.研究表明,物种的一些生活史特征和其病原传播能力表现出显著的相关性.本研究以虫媒传播型的西尼罗河病毒为例,通过文献检索系统收集了37种鸟类的病原传播能力指数,运用一般线性模型及系统发育比较法,分析了病原传播能力和3种生活史特征(体重、窝卵数及孵化时间)间的关系.一般线性模型和系统发育比较法的结果均表明,宿主物种的3种生活史特征和其病原传播能力间均无显著相关关系;但系统发育比较分析发现,病原传播能力表现出显著的系统发育信号,表明宿主间的亲缘关系能够在一定程度上解释病原传播能力的种间差异性.

Species’host competence for a specific pathogen generally shows considerable variations among species.It has been suggested that some life-history traits are significantly correlated with host competence.This study collects host competence index for West Nile virus for 37 bird species from published data,and explores the relationships between three life-history traits(i.e.body mass,clutch size and incubation time)and host competence using both general linear models and phylogenetic comparative analysis.The results suggest that neither of three life-history traits shows any significant relationship with host competence.However,the results from phylogenetic comparative analysis show a strong phylogenetic signal for host competence,suggesting that host phylogeny and host relatedness may partly explain the inter-specific variation in host competence.