Infrequent and unidirectional colonization of hyperdiverse Papuadytes diving beetles in New Caledonia and New Guinea
Infrequent and unidirectional colonization of hyperdiverse Papuadytes diving beetles in New Caledonia and New Guinea
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DOI：
10.1016/j.ympev.2006.07.019
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发表时间：
2007-02-01
影响因子：
4.1
通讯作者：
Vogler, Alfried P.
中科院分区：
文献类型：
--
作者：
Balke, Michael;Pons, Joan;Vogler, Alfried P.
我们提出了一个分子系统发育分析的2808对齐bp的rrnL，cox1，cob，H3和18S rRNA的所有主要形态组Papuadytes潜水甲虫（鞘翅目：Dytismandreae）是不同的流水栖息地在整个澳大利亚地区。我们专注于新几内亚和新喀里多尼亚的megadiversity岛屿的动物群的起源。吝啬以及贝叶斯分析表明，澳大利亚物种的基础位置在一个并系系列，最近嵌套辐射在新喀里多尼亚和新几内亚。根据分子钟分析，这两块大陆都在中新世被殖民，这与地质数据相匹配，并证实了其他分类群体的类似发现。我们的分析表明，分散在这些大型岛屿动物群的形成中发挥了重要作用，虽然成功的殖民似乎是一个罕见的事件，在这种情况下，是单向的。一个岛屿上是否存在一个谱系是偶然的：斐济没有Popuadytes，在那里相关的Copelatus在新喀里多尼亚和新几内亚的Popuadytes占据的相同栖息地广泛分布，而Copelatus则不在新喀里多尼亚。Papuadytes的血统显然殖民新喀里多尼亚两次，大约14和9百万年，根据分子校准，这两个血统都来自澳大利亚的祖先。老的分支是由两个明显的残余山种（一个形态强烈适应高度短暂的栖息地），而年轻的分支包含至少18种表现出巨大的形态多样性。新几内亚的150多个物种是单系的，显然来自澳大利亚的祖先，构成了一个形态上相当同质的群体。在简约性和贝叶斯分析下，树的主干仍然没有得到足够的支持，较短的分支表明主要分支事件的快速序列。(c)2006年爱思唯尔公司All rights reserved.
We present a molecular phylogenetic analysis of 2808 aligned bp of rrnL, cox1, cob, H3 and 18S rRNA of all major morphological groups of Papuadytes diving beetles (Coleoptera: Dytiscidae) which are diverse in running water habitats throughout the Australian region. We focus on the origin of the fauna of the megadiverse islands of New Guinea and New Caledonia. Parsimony as well as Bayesian analyses suggest a basal position of Australian species in a paraphyletic series, with more recent nested radiations in New Caledonia and New Guinea. According to molecular clock analyses, both landmasses were colonized during the Miocene, which matches geological data and corroborates similar findings in other taxonomic groups. Our analyses suggest that dispersal played an important role in the formation of these large insular faunas, although successful colonization appears to be a rare event, and, in this case, is unidirectional. Whether or not a lineage is present on an island is due to chance: Popuadytes are absent from Fiji, where related Copelatus have radiated extensively in the same habitats occupied by Popuadytes in New Caledonia and New Guinea, while Copelatus are absent from New Caledonia. Lineages of Papuadytes apparently colonized New Caledonia twice, around 14 and 9 MYA according to the molecular calibration, and both lineages are derived from an Australian ancestor. The older clade is represented only by two apparently relictual mountain species (one morphologically strongly adapted to highly ephemeral habitats), while the younger clade contains at least 18 species exhibiting a great morphological diversity. The 150+ species in New Guinea are monophyletic, apparently derived from an Australian ancestor, and constitute a morphologically rather homogenous group. The tree backbone remains insufficiently supported under parsimony and Bayesian analyses, where shorter branches suggest a rapid sequence of major branching events. (c) 2006 Elsevier Inc. All rights reserved.