Exploration of the diversity of tree ferns (Cyatheaceae, Dicksoniaceae - Polypodiopsida) along two elevational gradients in Indonesian New Guinea

印度尼西亚新几内亚沿两个海拔梯度树蕨（桫椤科、狄克逊科 - 水龙骨）多样性的探索

• 批准号: 168103576
• 负责人: Dr. Marcus Lehnert
• 金额: --
• 依托单位: Institut für Biologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/168103576?language=en
• 关键词: Exploration; diversity; tree; ferns; Cyatheaceae

The tree ferns of the families Cyatheaceae and Dicksoniaceae comprise the largest living ferns. Fragmentary collections and insufficient documentation of their habit have rendered their taxonomy a still unresolved problem Both families have a geologic history dating back to the early Mesozoic but also an impressive extant diversity, which makes them perfect objects to explore general patterns of phylogeography and the mechanisms behind recent adaptive radiations. In existing phylogenies many crucial groups are underrepresented. New Guinea has a diverse tropical flora rich in endemics but is still widely unexplored. The proposed project aims to get a representative collection of New Guinean Cyatheaceae and Dicksoniaceae to test current taxonomic and phylogenetic hypotheses. In particular, we will look for basal members of Cyathea, which are presumed to occur on the island, in order to get a better resolution and dating of the basal split the between the neotropical and paleotropical clade in this genus. Further it will be tested if the New Guinean Cyatheaceae have experienced a similar recent radiation burst as in the Andes and on Madagascar. Finally, we will look if the relict genus Dicksonia is represented on the island with neo- or paleoendemics.

桫椤科和迪克森科的树蕨是现存最大的蕨类植物。这两个科的地质历史可以追溯到中生代早期，但也有令人印象深刻的现存多样性，这使它们成为探索地球地理学一般模式和最近适应性辐射背后机制的完美对象。在现有的非政府组织中，许多关键群体的代表性不足。新几内亚拥有丰富的热带植物群，但仍有大量未开发的植物。该拟议项目旨在获得新几内亚矢车菊科和迪克森科的代表性标本，以测试当前的分类学和系统发育假设。特别是，我们将寻找桫椤属的基底成员，这是假定发生在岛上，为了得到一个更好的分辨率和定年的基底分裂之间的新热带和古热带分支在这个属。此外，还将测试新几内亚的桫椤科植物是否经历了与安第斯山脉和马达加斯加类似的最近辐射爆发。最后，我们将看看是否残遗属Dicksonia是代表在岛上的新或古特有种。