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植物研究 ›› 2013, Vol. 33 ›› Issue (4): 441-447.doi: 10.7525/j.issn.1673-5102.2013.04.010

• 论文 • 上一篇    下一篇

世界砂藓属植物地理分布格局及其系统演化意义

徐明;于晶*;郭水良;曹同   

  1. 上海师范大学生命与环境科学学院,上海 200234
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2013-07-20 发布日期:2013-07-20
  • 通讯作者: 于晶
  • 基金资助:
     

Geographical Distribution Pattern of Racomitrium(Grimmiaceae,Bryophyta) in the World and Its Evolutionary Significance

XU Ming;YU Jing*;GUO Shui-Liang;CAO Tong   

  1. College of Life and Environmental Sciences,Shanghai Normal University,Shanghai 200234
  • Received:1900-01-01 Revised:1900-01-01 Online:2013-07-20 Published:2013-07-20
  • Contact: YU Jing
  • Supported by:
     

摘要: 以“Index Muscorum”中的20个藓类植物地理分布单位为分析区域,基于标本信息和相关文献,统计了世界砂藓属84种植物在20个地理单位的分布数据,应用除趋势对应分析法和三维空间图直观地展示了世界砂藓属植物的地理分布格局。发现世界砂藓属植物分布明显地分为南半球区和北半球区,并与岗瓦纳古陆和劳亚古陆有较好的对应性。南半球区包括Am.2,Am.3,Am.4,Am.5,Am.6,Afr.2,Afr.3,Afr.4,Austr.1,Austr.2,As.4和Ant.等12个地理单位;北半球区包括Am.1,Eur.,As.1,As.2,As.3,As.5,Afr.1和Oc.等8个地理单位。砂藓属中的无瘤类群在南、北半球分布广泛,而叶片细胞壁具瘤的NiphotrichumCodriophorus亚属的种类主要分布在北半球。推测砂藓属植物的起源应早于联合古陆分裂以前,其祖先类群的叶片细胞表面光滑无瘤。

关键词: 砂藓属, 地理分布格局, 除趋势对应分析法

Abstract: Based on the distribution data of 84 species of the genus Racomitrium in 20 geographical unites (suggested by “Index Muscorum”)in the world, Detrended Correspondence Analysis (DCA) and 3-Dimensional scatter plots were applied to study the distribution pattern of the genus. The results showed that 20 geographical units in relation to the distribution of Racomitrium in the world could be divided into north hemisphere region and south hemisphere region. The north hemisphere region (mainly from Laurasia) includes Am.1, Eur., As.1, As.2, As.3, As.5, Afr.1 and Oc., while the south region (mainly from Gondwana) includes Am.2, Am.3, Am.4, Am.5, Am.6, Afr.2, Afr.3, Afr.4, Austr.1, Austr.2, As.4, Ant.. The floristic characteristics of the two regions were also analyzed. The results show that the flora of the genus Racomitrium between North and South Hemispheres are obviously different. The groups of Niphotrichum and Codriophorus with lamina papillae mainly distributed in the North Hemisphere, and the taxa of the genus without lamina papillae widely distributed on both the hemispheres. Based on the distribution patterns of the genus Ptychomitrium in the world, the origination of the genus was also speculated, and it is possible that the genus Racomitrium originated before the division of the Pangaea, and the ancestors of Racomitrium are those without laminal papilliae.

Key words: Racomitrium, geographical distribution pattern, detrended correspondence analysis

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