Molecular phylogenetics and historical biogeography of Hawaiian Dryopteris (Dryopteridaceae)
Molecular phylogenetics and historical biogeography of Hawaiian Dryopteris (Dryopteridaceae)
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DOI：
10.1016/j.ympev.2004.11.001
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发表时间：
2005-02-01
影响因子：
4.1
通讯作者：
Ranker, TA
中科院分区：
文献类型：
--
作者：
Geiger, JMO;Ranker, TA
鳞毛蕨属（鳞毛蕨科）在夏威夷群岛有18个特有分类群和一个非特有的本地物种。本研究的目的是确定是否在夏威夷鳞毛蕨是单系的，并推断夏威夷鳞毛蕨的地理起源，确定其最近的生活亲属的地理分布。我们测序了两个叶绿体DNA片段，rbcL和trnL-F基因间间隔区（IGS），为18个夏威夷类群，45个非夏威夷类群，和两个外类群物种。对于单个片段，我们估计系统发育关系，使用贝叶斯推断和最大简约。我们采用贝叶斯推断，最大简约法和最大似然法对两个cpDNA片段进行了综合分析。这些分析表明，夏威夷鳞毛蕨不是单系的，夏威夷群岛至少有五个不同种类的鳞毛蕨的殖民地，这五个群体中的大多数在东南亚有最近的亲戚。结果表明，一个殖民的祖先，也许来自东南亚，产生了8个特有类群（光轮组）。另一个殖民的祖先，也可能来自东南亚，产生了一组五个特有的类群（exindusiate组）。棕鳞毛蕨及其两个变种是夏威夷特有的，很可能是从东南亚祖先分化而来的。夏威夷特有的红锈假甲藻（Nothoperanema rubiginosum）在东南亚有其最近的亲缘关系，而其余两种，即红锈假甲藻（D. wallichiana和D. subbipinnata是姐妹种，由于D. wallichiana和它最近的非夏威夷亲戚。(C)2004爱思唯尔公司All rights reserved.
The fern genus Dryopteris (Dryopteridaceae) is represented in the Hawaiian Islands by 18 endemic taxa, and one non-endemic, native species. The goals of this study were to determine whether Dryopteris in Hawai'i is monophyletic and to infer the biogeographical origins of Hawaiian Dryopteris by determining the geographical distributions of their closest living relatives. We sequenced two chloroplast DNA fragments, rbcL and the trnL-F intergenic spacer (IGS), for 18 Hawaiian taxa, 45 non-Hawaiian taxa, and two outgroup species. For individual fragments, we estimated phylogenetic relationships using Bayesian inference and maximum parsimony. We performed a combined analysis of both cpDNA fragments employing Bayesian inference, maximum parsimony, and maximum likelihood. These analyses indicate that Hawaiian Dryopteris is not monophyletic, and that there were at least five separate colonizations of the Hawaiian Islands by different species of dryopteroid ferns, with most of the five groups having closest relatives in SE Asia. The results suggest that one colonizing ancestor, perhaps from SE Asia, gave rise to eight endemic taxa (the glabra group). Another colonizing ancestor, also possibly from SE Asia, gave rise to a group of five endemic taxa (the exindusiate group). Dryopteris fusco-atra and its two varieties, which are endemic to Hawai'i, most likely diversified from a SE Asian ancestor. The Hawaiian endemic Nothoperanema rubiginosum has its closest relatives in SE Asia, and while the remaining two species, D. wallichiana and D. subbipinnata, are sister species, their biogeographical origins could not be determined from these analyses due to the widespread distributions of D. wallichiana and its closest non-Hawaiian relative. (C) 2004 Elsevier Inc. All rights reserved.