Historical biogeography of Aganope, Brachypterum and Derris (Fabaceae, tribe Millettieae): insights into the origins of Palaeotropical intercontinental disjunctions and general biogeographical patterns in Southeast Asia
Historical biogeography of Aganope, Brachypterum and Derris (Fabaceae, tribe Millettieae): insights into the origins of Palaeotropical intercontinental disjunctions and general biogeographical patterns in Southeast Asia
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DOI：
10.1111/jbi.12262
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发表时间：
2014-05-01
影响因子：
3.9
通讯作者：
van Welzen, Peter C.
中科院分区：
文献类型：
--
作者：
Sirichamorn, Yotsawate;Thomas, Daniel C.;van Welzen, Peter C.
目的研究古热带豆科植物Aganope、Brachypterum和Derris的历史生物地理学，目的是(1)评价关于古热带洲际分离(PIDs)起源的相互竞争的假说，(2)推断热带东南亚热带地区的时空变化模式。应用扩散-灭绝-分支发生模型的似然方法(拉格朗日)和贝叶斯扩散-替代分析方法(S-DIVA)重建祖先区域。结果推测Aganope茎和树冠群在非洲和亚洲有广泛的祖先分布，并在中新世早期在非洲和亚洲之间发生了一次替代事件。东南亚大陆被推测为短翅目和德里斯冠群的祖传地区。重建表明，从中新世中期开始，向西扩散到印度，向东越过华莱士线到达新几内亚，发生了多次扩散事件。推测了中新世-上新世和德里斯上新世-更新世两次从亚洲向非洲扩散的事件。主要结论：Aganope的PID可能是中中新世气候最佳后气候恶化造成的交接结果。推测的中新世中期至上新世-更新世的短翅目和地体中的PID与远距离扩散一致。Brachypterum和Derris的生物地理格局与其他东南亚植物类群的格局相似，并与东南亚的地质事件高度一致，有利于从早中新世开始扩散。对包括红树林沼泽在内的几种环境条件和生境的预适应，以及水生动物的高度分散能力，可以解释一些物种的广泛分布和频繁在分隔马来西亚西部和东部的海洋水体之间的扩散。
AimThe historical biogeography of three Palaeotropical legume genera, Aganope, Brachypterum and Derris, was investigated with the aim of (1) evaluating competing hypotheses on the origins of Palaeotropical intercontinental disjunctions (PIDs), and (2) inferring spatio-temporal diversification patterns in tropical Southeast Asia.LocationPalaeotropics.MethodsPlastid (trnL-F IGS, psbA-trnH IGS and trnK-matK ORF) and nuclear ribosomal (ITS/5.8S) DNA sequence data, covering the geographical distribution of all three genera, were analysed using an uncorrelated-rates relaxed molecular clock model. Ancestral areas were reconstructed using a likelihood approach implementing the dispersal-extinction-cladogenesis model (Lagrange) and a Bayesian approach to dispersal-vicariance analysis (S-DIVA).ResultsA wide ancestral distribution in Africa and Asia was inferred for the Aganope stem and crown groups, with a vicariance event between Africa and Asia in the early Miocene. The Southeast Asian mainland was inferred as the ancestral area for both the Brachypterum and the Derris crown groups. The reconstructions indicated numerous dispersal events westwards to India, and eastwards across Wallace's Line to New Guinea from the middle Miocene onwards. Two dispersal events from Asia to Africa, in the Miocene-Pliocene in Brachypterum and in the Pliocene-Pleistocene in Derris, were deduced.Main conclusionsThe PID in Aganope is likely to be the result of vicariance, caused by climatic deterioration subsequent to the Middle Miocene Climatic Optimum. The inferred PIDs in Brachypterum and Derris in the middle Miocene to Pliocene-Pleistocene are consistent with long-distance dispersal. The biogeographical patterns of Brachypterum and Derris are similar to patterns identified in other Southeast Asian plant taxa, and highly congruent with geological events in Southeast Asia facilitating dispersal from the early Miocene onwards. Preadaptation to several environmental conditions and habitats including mangrove swamps, and high dispersal capabilities by hydrochory may explain the wide distributions of some species and frequent dispersal across oceanic water bodies separating western and eastern Malesia.