Global biogeography and diversification of palms sheds light on the evolution of tropical lineages. I. Historical biogeography
Global biogeography and diversification of palms sheds light on the evolution of tropical lineages. I. Historical biogeography
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DOI：
10.1111/j.1365-2699.2012.02795.x
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发表时间：
2013-02-01
影响因子：
3.9
通讯作者：
Couvreur, Thomas L. P.
中科院分区：
文献类型：
--
作者：
Baker, William J.;Couvreur, Thomas L. P.
目标棕榈（槟榔科/棕榈科）是热带地区进化研究的模型群体。现在可以获得有关分类学、系统发育学和分布的全科数据，但仍然缺乏棕榈进化的总体框架。这项研究发表在两篇配套论文中，其总体目标是寻求全球和区域层面棕榈谱系地理分布和物种多样性模式的进化解释。在第一篇论文中，我们对全球范围内所有主要谱系的棕榈生物地理学进行了详细分析，将我们的结果与化石记录、分子测年研究和先前为该家族建立的生物地理学假设进行了比较。地点 全球。方法 使用所有棕榈属的过时系统发育和分布数据来推断祖先区域。制定了热带谱系区域演化的全球模型，并在分散灭绝分支发生模型下使用最大似然法重建了祖先区域。结果 劳亚地区棕榈树的冠节点分歧和所有五个亚科的分歧都发生在白垩纪末之前。早期向南美洲的范围扩张发生在Arecoideae和Ceroxyloideae亚科的茎谱系中，并在白垩纪Calamoideae亚科的白垩纪谱系中向非洲和南美洲发生。最大的槟榔亚科在南美洲经历了早期的多样化历史，并且一直是扩展到其他地区的谱系的重要来源，特别是在印度-太平洋主要部落槟榔科。相比之下，Coryphoideae 亚科的历史主要是劳亚大陆，支持了该群体早期的向北线假说。在马里西亚群岛中新世地质演化之前和之后，跨越华莱士线的扩散在槟榔亚科、Calamoideae 和 Coryphoideae 的主要类群中都很普遍。主要结论我们提出了第一个关于棕榈在空间和时间上演化的可靠的生物地理学假说。尽管棕榈树显示出扩散限制的证据，但我们的研究结果强调了长距离扩散事件在建立棕榈分支主要生物地理模式中的作用。这与越来越多的证据表明长距离传播是支撑热带谱系分布的主要机制是一致的。
Aim Palms (Arecaceae/Palmae) are a model group for evolutionary studies in the tropics. Family-wide data on taxonomy, phylogenetics and distribution are now available, but a general framework of palm evolution is still lacking. The overall aim of this study, published in two companion papers, is to seek evolutionary explanations for the geographical distribution of palm lineages and species diversity patterns at global and regional levels. In this first paper we undertake a detailed analysis of palm biogeography for all major lineages in a global context, comparing our results to the fossil record, molecular dating studies and previously established biogeographical hypotheses for the family. Location Global. Methods A dated phylogeny of all palm genera and distributional data were used to infer ancestral areas. A global model of area evolution for tropical lineages was formulated and ancestral areas were reconstructed using a maximum likelihood approach under the dispersalextinctioncladogenesis model. Results The crown node divergence of palms and divergences of all five subfamilies occurred before the end of the Cretaceous within Laurasian regions. Early range expansions into South America took place in the stem lineages of subfamilies Arecoideae and Ceroxyloideae, and into Africa and South America in Cretaceous lineages within subfamily Calamoideae. The largest subfamily Arecoideae underwent its early diversification history in South America and has been an important source of lineages expanding into other regions, notably in the major Indo-Pacific tribe Areceae. In contrast, the history of subfamily Coryphoideae was primarily Laurasian, supporting earlier boreotropical hypotheses for the group. Dispersals across Wallace's Line are prevalent in major groups of Arecoideae, Calamoideae and Coryphoideae, both before and after the Miocene geological evolution of the Malesian Archipelago. Main conclusions We present the first robust biogeographical hypothesis for the evolution of palms in space and time. Although palms show evidence of dispersal limitation, our findings highlight the role of long-distance dispersal events in the establishment of major biogeographical patterns of palm clades. This is consistent with the growing evidence for long-distance dispersal as a major mechanism underpinning the distribution of tropical lineages.