Investigating population differentiation in a major African agricultural pest: evidence from geometric morphometrics and connectivity suggests high invasion potential

The distribution, spatial pattern and population dynamics of a species can be influenced by differences in the environment across its range. Spatial variation in climatic conditions can cause local populations to undergo disruptive selection and ultimately result in local adaptation. However, local adaptation can be constrained by gene flow and may favour resident individuals over migrants—both are factors critical to the assessment of invasion potential. The Natal fruit fly (Ceratitis rosa) is a major agricultural pest in Africa with a history of island invasions, although its range is largely restricted to south east Africa. Across Africa, C. rosa is genetically structured into two clusters (R1 and R2), with these clusters occurring sympatrically in the north of South Africa. The spatial distribution of these genotypic clusters remains unexamined despite their importance for understanding the pest's invasion potential. Here, C. rosa, sampled from 22 South African locations, were genot...

一个物种种群的分布、空间格局与种群动态，会受到其分布范围内环境差异的影响。气候条件的空间变异可促使本地种群经历歧化选择，最终形成本地适应。然而，基因流会对本地适应造成约束，且该过程可能更青睐本地个体而非迁入个体——二者均为评估入侵潜力的关键影响因素。纳塔尔实蝇（Natal fruit fly, Ceratitis rosa）是非洲主要农业害虫，虽已有入侵岛屿的记录，但其分布范围主要局限于非洲东南部。在非洲全境，C. rosa 已被划分为两个遗传聚类群（R1与R2），这两个聚类群在南非北部区域呈同域分布。尽管这两个聚类群对于理解该害虫的入侵潜力至关重要，但目前尚未对其基因型聚类群的空间分布展开研究。本研究对采自南非22个采样点的C. rosa样本开展了基因分型……