Dispersal propensity, but not flight performance, explains variation in dispersal ability

Enhanced dispersal ability may lead to accelerated range expansion and increased rates of population establishment, thereby affecting population genetic structure and evolutionary potential. Morphological, behavioural and physiological traits that characterize dispersive individuals from residents are poorly understood for many invertebrate systems, especially in non-polymorphic pterygote species. Here we examined phenotypic differences between dispersal-prone and philopatric individuals from repeated mark-release-recapture (MRR) experiments using an invasive agricultural pest, Ceratitis capitata. Comprehensive morphometric assessment and subsequent minimal adequate modelling using an information theoretic approach identified thorax mass : body mass ratio as a key predictor of disperser flies under semi-natural conditions. Performance differences in flight ability were then examined under controlled laboratory conditions to assess whether greater thorax mass : body mass ratio was associ...扩散能力提升可能会加速种群分布范围扩张，并提高种群定殖速率，进而对种群遗传结构与进化潜力产生影响。针对诸多无脊椎动物类群，尤其是非多态性有翅昆虫，区分扩散个体与留居个体的形态、行为及生理特征仍未得到充分阐释。本研究以入侵性农业害虫地中海实蝇（Ceratitis capitata）为研究对象，基于重复标记-重捕（mark-release-recapture, MRR）实验，探究了易扩散个体与留居个体间的表型差异。通过全面的形态测量评估，以及后续采用信息论方法开展的最小充分建模，我们发现在半自然环境下，胸重与体重之比是辨别扩散型实蝇的关键预测因子。随后，我们在可控实验室条件下检测了飞行能力的性能差异，以探究更高的胸重与体重之比是否与……