Canavalia rosea, a perennial vine of the legume (Fabaceae) family, is commonly found in the tropical and subtropical coasts of the world. The long-distance dispersal ability of its sea-drifted seeds has aided the species to attain a pantropical distribution. While there has been some progress on its global phylogeography, the influence of evolutionary mechanisms on the genetic composition of C. rosea at a regional scale is still unknown. In this study, we used 13 nuclear microsatellite markers and 376 samples of C. rosea from 29 sampling sites to estimate the genetic diversity and assessed the influence of gene flow and demographic features on the population structure of the species in the Indo-West Pacific (IWP) region. We found high genetic diversity and moderate genetic differentiation of C. rosea in this region. Both spatial and non-spatial clustering algorithms revealed a subtle genetic structure created by the oceanic circulation pattern of the South China Sea (SCS), thereby differentiating the sampling sites of northern SCS from the rest and even creating a genetic break within the north of SCS. However, the Bayesian analysis of migration rate and direction revealed that propagules of C. rosea could move around the cryptic barriers of ocean currents and the land barrier of the Malay Peninsula, thereby weakening the genetic differentiation between these population clusters. Although a significant relationship between geographic distance and genetic differentiation was found, our findings suggested that a continuous distribution model of gene flow could have influenced the population structure of C. rosea in this region.

Canavalia rosea是豆科植物（豆科）的多年生藤本植物，常见于世界热带和亚热带海岸。其在海中漂流的种子的长距离传播能力有助于该物种获得泛热带分布。虽然在其全球系统地理学上取得了一些进展，但进化机制对区域尺度上C. rosea遗传组成的影响仍然未知。在这项研究中，我们使用了 13 个核微卫星标记和 376 个C. rosea样本从 29 个采样点估计遗传多样性，并评估基因流和人口特征对印度-西太平洋 (IWP) 地区物种种群结构的影响。我们在该地区发现了C. rosea 的高遗传多样性和中等遗传分化。空间和非空间聚类算法都揭示了南海海洋环流模式（SCS）产生的微妙遗传结构，从而区分了南海北部的采样点，甚至在南海北部造成了遗传断裂. 然而，对迁移率和方向的贝叶斯分析表明，C. rosea 的繁殖体可以绕过洋流的神秘屏障和马来半岛的陆地屏障，从而削弱这些种群之间的遗传分化。虽然发现地理距离与遗传分化之间存在显着关系，但我们的研究结果表明，基因流的连续分布模型可能影响了该地区C. rosea的种群结构。