Biogeographic divides delineated by the three-step landforms of China and the East China Sea: insights from the phylogeography of Kerria japonica

Aim: East Asia exhibits complex geomorphological and climatic characteristics. The aim of this study was to test whether the so-called three-step landforms of China, together with the East China Sea (ECS), have acted to shape specific phylogeographic patterns and affected the biogeographic history of the species belonging to the East Asian Flora (EAF).

Location: China and Japan

Taxon: Kerria japonica (L.) DC

Methods: Three chloroplast DNA (cpDNA) regions and 15 nuclear microsatellite (nSSR) loci were sequenced and genotyped in 576/450 individuals of K. japonica. Phylogeographical analyses were performed to assess the genetic structure, historical gene flow, and demographic history of these individuals, and climatic factors were examined to determine their effects on phylogeographical breaks. Furthermore, time-calibrated phylogenetic trees and ancestral range reconstruction were used to infer the biogeographic history of K. japonica. Potential habitats at present and during the...

研究目的：东亚具有复杂的地貌与气候特征。本研究旨在验证中国所谓的三级阶梯地貌与东海（East China Sea, ECS）是否共同塑造了特定的系统地理格局，并影响了东亚植物区系（East Asian Flora, EAF）物种的生物地理历史。

研究地点：中国与日本

研究类群：棣棠花（Kerria japonica (L.) DC）

研究方法：对576/450株棣棠花个体的3个叶绿体DNA（chloroplast DNA, cpDNA）区域和15个核微卫星（nuclear microsatellite, nSSR）位点进行测序和基因分型。通过系统地理学分析评估这些个体的遗传结构、历史基因流及种群历史，并分析气候因子以确定其对系统地理间断的影响。此外，利用时间校准的系统发育树和祖先分布区重建推断棣棠花的生物地理历史。当前及（原文此处未完整）时期的潜在生境...