Population genetic structure, local adaptation, and conservation genetics of Kandelia obovata

Topographic changes during the Pleistocene glacial/interglacial cycles affected the distribution of coastline mangroves and influenced their population genetic structure. The submergence of the continental shelf off southeast China during the postglacial age caused coastline expansions and resulted in the colonization of mangroves. Here, we performed multilocus genome scans using amplified fragment-length polymorphisms to explore the effects of topography and natural selection in structuring Kandelia obovata populations. Long-term isolation by the Taiwan Strait since the end of the last glacial maximum, which obstructed gene flow, differentiated the Taiwanese and Chinese populations. Founders that colonized from both outlets of the Taiwan Strait were sourced from the northern South China Sea and the Ryukyus, thereby creating a melting pot in the Taiwan Strait. Inner-strait currents played roles as vectors for propagule dispersal among populations. Upon examination of the allele-frequenc...

更新世（Pleistocene）冰期/间冰期旋回期间的地形变化，既影响了海岸红树林的空间分布格局，也对其种群遗传结构产生了塑造作用。冰后期中国东南近海大陆架的海侵，促使海岸线向海扩张，进而为红树林的拓殖创造了有利条件。本研究采用扩增片段长度多态性（amplified fragment-length polymorphisms, AFLP）开展多位点基因组扫描分析，旨在探究地形变化与自然选择如何塑造秋茄（Kandelia obovata）的种群遗传结构。自末次冰盛期（Last Glacial Maximum）结束以来，台湾海峡长期的地理隔离阻碍了种群间的基因交流，进而导致台湾种群与中国大陆种群产生遗传分化。从台湾海峡南北两端完成拓殖的奠基种群，其遗传来源分别为南海北部与琉球群岛（Ryukyus），由此在台湾海峡区域形成了一处遗传混合区。海峡内部的海流充当了繁殖体（propagule）在各种群间扩散的媒介。在对等位基因频率展开分析时，[原文未完整呈现后续内容]