利用近似贝氏计算推论台湾海峡沿岸秋茄种群的拓殖路线

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 利用近似贝氏计算推论台湾海峡沿岸秋茄种群的拓殖路线 DOI: 10.5846/stxb201402200297 作者: 作者单位: 北京林业大学,重庆三峡学院,北京林业大学,北京林业大学,重庆三峡学院,福建省漳江口红树林国家级自然保护区管理局 作者简介: 通讯作者: 中图分类号: 基金项目: 由ITTO(国际木材组织)与国家林业局共同资助《通过社区发展和能力建设实现中国红树林可持续经营(PD 460/07 Rev.2(F》 Kandelia obovata Colonization route along Taiwan Strait Inferenced by approximate Bayesian computation Author: Affiliation: The Academy of Forestry of Beijing Forestry University;Chongqing Three Gorges University;,The Academy of Forestry of Beijing Forestry University;,The Academy of Forestry of Beijing Forestry University;,,Fujian Zhangjiangkou Mangrove Nature Ｒeserve，Yunxiao 363300， Fujian，China; Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:由于地理关系,台湾海峡两岸的红树植物组成具有高度的相似性,都以耐寒性较强的秋茄为优势种。中国台湾(以下简称"台湾")与大陆仅一水之隔,因此台湾的秋茄种群来源最有可能来自东南沿海种群,然而台湾南、北红树植物种群的拓殖路线以及与大陆东南沿海种群的遗传关系的研究至今仍未见报道。通过SSR分子标记, 利用近似贝氏计算(Approximate Bayesian Computation)推测海峡两岸4个分布区域秋茄的起源及其拓殖路线。结果表明4个区域的种群出现明显分化,大陆东南北部种群与其他种群间分化程度最高。通过推测台湾北部种群起源可追溯到29000-48400a前,早于末次冰期时间,且台湾北部种群遗传结构与大陆东南南部种群最相近,推测它们可能共同起源于南方祖先。大陆东南沿海南北种群的溯祖时间约为15.1万年至25.2a年前,约为更新世中期末,则意味东南沿海南、北种群的遗传分化可能受到更新世后期气候变化与海侵海退的影响而出现隔离,或东南沿海南、北种群可能来自不同的起源。而台湾南部种群与台湾北部种群的相似性,表明台湾南部种群是由北部种群拓殖而来,近似贝氏计算亦支持这个假说。因而,可以推测海峡两岸秋茄的拓殖路线是从大陆东南南方种群随黑潮迁移至台湾北部,再从北部拓殖到台湾南部。利用近似贝氏计算推论台湾海峡两岸红树林种群起源及拓殖路线,为未来我国东南沿海红树林植物的生物地理研究提供参考。 Abstract:The community compositions of mangroves in both southeastern coasts of mainland China and west coast of Taiwan share great similarities because of topogeographic reasons and Kandelia obovata, with its higher cold-tolerance,is the dominant mangrove species on either side of the Strait. Therefore, K. obovata populations in Taiwan, China may most possibly derive from that of China southeast coastal areas. However, the colonization route of the northern and southern populations in Taiwan, China and their genetic relationship with that of mainland China have not been reported. In this study simple-sequence-repeat (SSR) markers and approximate-Bayesian-computation (ABC) were applied to trace its origins in the four distribution locations between the Strait. The results showed obvious differentiation among them and the northern part of the mainland southeastern coast illustrated a higher degree than the other three. It was also inferred that the origin of the northern Taiwan, China population could be trance back to circa 29000-48400 years ago, prior to the last glacial period and its genetic structure was the closest to the southern population of China southeast coast, suggesting they may derive from a common ancestor in the south. The northern and southern populations of the Southeast China coast probably coalesced circa 151000-252000 years ago, approximately during the late mid-Pleistocene. The possible implication lies in that the genetic differentiation between the northern and southern populations and their separation may caused by late-Pleistocene climate changes and sea transgression and regression or that they had different origins. Whereas the highest population similarity between the northern and southern Taiwan, China indicates that the southern population was colonized from the north one, and the hypothesis is also supported by the results of approximate Bayesian computation. It can be inferred therefore that the overall colonization route started from southern population of southeast China and migrated with the Kuroshio Branch Current to the north of Taiwan, China before it ultimately colonized in the south. The study is the first one to utilize approximate Bayesian computation to illustrate the origination and colonization route of mangrove populations between Taiwan, China Strait and has provided referential model for mangrove biogeographic research in coastal Southeast China. 参考文献 相似文献 引证文献