Land masses and oceanic currents drive population structure of Heritiera littoralis, a widespread mangrove in the Indo-West Pacific.,Ecology and Evolution

当前位置： X-MOL 学术 › Ecol. Evol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Land masses and oceanic currents drive population structure of Heritiera littoralis, a widespread mangrove in the Indo-West Pacific.
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-06-03 , DOI: 10.1002/ece3.6460
Achyut Kumar Banerjee ₁ , Wuxia Guo _{1,

2} , Sitan Qiao ₁ , Weixi Li _{1,

3} , Fen Xing ₁ , Yuting Lin ₁ , Zhuangwei Hou ₁ , Sen Li ₁ , Ying Liu ₁ , Yelin Huang ₁

Affiliation

Phylogeographic forces driving evolution of sea‐dispersed plants are often influenced by regional and species characteristics, although not yet deciphered at a large spatial scale for many taxa like the mangrove species Heritiera littoralis . This study aimed to assess geographic distribution of genetic variation of this widespread mangrove in the Indo‐West Pacific region and identify the phylogeographic factors influencing its present‐day distribution. Analysis of five chloroplast DNA fragments’ sequences from 37 populations revealed low genetic diversity at the population level and strong genetic structure of H. littoralis in this region. The estimated divergence times between the major genetic lineages indicated that glacial level changes during the Pleistocene epoch induced strong genetic differentiation across the Indian and Pacific Oceans. In comparison to the strong genetic break imposed by the Sunda Shelf toward splitting the lineages of the Indian and Pacific Oceans, the genetic differentiation between Indo‐Malesia and Australasia was not so prominent. Long‐distance dispersal ability of H. littoralis propagules helped the species to attain transoceanic distribution not only across South East Asia and Australia, but also across the Indian Ocean to East Africa. However, oceanic circulation pattern in the South China Sea was found to act as a barrier creating further intraoceanic genetic differentiation. Overall, phylogeographic analysis in this study revealed that glacial vicariance had profound influence on population differentiation in H. littoralis and caused low genetic diversity except for the refugia populations near the equator which might have persisted through glacial maxima. With increasing loss of suitable habitats due to anthropogenic activities, these findings therefore emphasize the urgent need for conservation actions for all populations throughout the distribution range of H. littoralis .

中文翻译：

陆地和洋流驱动着印度-西太平洋地区广泛分布的红树林 Heritiera littoralis 的种群结构。

驱动海洋分散植物进化的系统地理学力量通常受到区域和物种特征的影响，尽管许多类群（如红树林物种Heritiera littoralis ）尚未在大空间尺度上被破译。本研究旨在评估印度-西太平洋地区广泛分布的红树林遗传变异的地理分布，并确定影响其当前分布的系统地理学因素。对来自 37 个居群的 5 个叶绿体 DNA 片段序列的分析表明，该地区的北海螟在居群水平上遗传多样性较低，但遗传结构较强。主要遗传谱系之间的估计分化时间表明，更新世时期的冰川水平变化引起了印度洋和太平洋的强烈遗传分化。与巽他陆架对印度洋和太平洋谱系造成的强烈遗传断裂相比，印度-马来西亚和澳大利亚之间的遗传分化并不那么突出。 H. littoralis繁殖体的长距离扩散能力帮助该物种实现了跨洋分布，不仅跨越东南亚和澳大利亚，还跨越印度洋到达东非。然而，南海的海洋环流模式被发现充当了进一步造成洋内遗传分化的障碍。总体而言，本研究中的系统发育地理学分析表明，冰川变化对北海道的种群分化具有深远的影响，并导致遗传多样性较低，但赤道附近的避难种群除外，这些种群可能在冰川盛期持续存在。因此，随着人类活动导致适宜栖息地的丧失不断增加，这些发现强调迫切需要对北海螟分布范围内的所有种群采取保护行动。

更新日期：2020-07-30

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11