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Dispersal and adaptive radiation of Bidens (Compositae) across the remote archipelagoes of Polynesia
Journal of Systematics and Evolution ( IF 3.4 ) Pub Date : 2020-11-01 , DOI: 10.1111/jse.12704
Matthew L. Knope 1 , Vicki A. Funk 2 , Melissa A. Johnson 3 , Warren L. Wagner 2, 4 , Erin M. Datlof 1 , Gabriel Johnson 2 , Daniel J. Crawford 5 , J. Mauricio Bonifacino 6 , Clifford W. Morden 7 , David H. Lorence 4 , Kenneth R. Wood 4 , Jean‐Yves Meyer 8 , Sherwin Carlquist 9
Affiliation  

The genus Bidens (Compositae) comprises c. 230 species distributed across five continents, with the 41 Polynesian species displaying the greatest ecomorphological variation in the group. However, the genus has had a long and complicated taxonomic history, and its phylogenetic and biogeographic history are poorly understood. To resolve the evolutionary history of the Polynesian Bidens, 152 individuals representing 91 species were included in this study, including 39 of the 41 described species from Polynesia. Four chloroplast and two nuclear DNA markers were utilized to estimate phylogenetic relationships, divergence times, and biogeographic history. Bidens was found to be polyphyletic within Coreopsis, consistent with previous assessments. The Polynesian radiation was resolved as monophyletic, with the initial dispersal into the Pacific possibly from South America to either the Hawaiian or Marquesas Islands. From the Marquesas, Bidens dispersed to the Society Islands, and ultimately to the Austral Islands. The initial diversification of the crown group in the Pacific is estimated to have occurred ~1.63 mya (0.74–2.72, 95% HPD), making Polynesian Bidens among the youngest and most rapid plant diversification events documented in the Pacific. Our findings suggest that relatively rare long‐distance dispersal and founder‐event speciation, coupled with subsequent loss of dispersal potential and within‐island speciation, can explain the repeated and explosive adaptive radiation of Bidens throughout the archipelagoes of Polynesia.

中文翻译:

拜登(菊科)在波利尼西亚偏远群岛的分散和适应性辐射

拜登属(菊科)包括 c。230 个物种分布在五大洲,其中 41 个波利尼西亚物种在该组中表现出最大的生态形态变异。然而,该属有着漫长而复杂的分类历史,对其系统发育和生物地理历史知之甚少。为了解决波利尼西亚拜登斯的进化历史,本研究纳入了代表 91 个物种的 152 个人,其中包括来自波利尼西亚的 41 个描述物种中的 39 个。四个叶绿体和两个核 DNA 标记被用来估计系统发育关系、分歧时间和生物地理历史。发现拜登斯在金鸡菊内是多系的,与之前的评估一致。波利尼西亚辐射被解析为单系的,最初可能从南美洲扩散到夏威夷或马克萨斯群岛。从马克萨斯群岛,拜登斯分散到社会群岛,并最终到达澳大利亚群岛。据估计,太平洋冠群的初始多样化发生了约 1.63 mya(0.74-2.72,95% HPD),使波利尼西亚拜登成为太平洋上记录的最年轻和最快速的植物多样化事件。我们的研究结果表明,相对罕见的长距离扩散和创始事件物种形成,加上随后扩散潜力和岛内物种形成的丧失,可以解释拜登斯在波利尼西亚群岛中重复和爆炸性的适应性辐射。拜登斯分散到社会群岛,并最终到达澳大利亚群岛。据估计,太平洋冠群的初始多样化发生了约 1.63 mya(0.74-2.72,95% HPD),使波利尼西亚拜登成为太平洋上记录的最年轻和最快速的植物多样化事件。我们的研究结果表明,相对罕见的长距离扩散和创始事件物种形成,加上随后扩散潜力和岛内物种形成的丧失,可以解释拜登斯在波利尼西亚群岛中重复和爆炸性的适应性辐射。拜登斯分散到社会群岛,并最终到达澳大利亚群岛。据估计,太平洋冠群的初始多样化发生了约 1.63 mya(0.74-2.72,95% HPD),使波利尼西亚拜登成为太平洋上记录的最年轻和最快速的植物多样化事件。我们的研究结果表明,相对罕见的长距离扩散和创始事件物种形成,加上随后扩散潜力和岛内物种形成的丧失,可以解释拜登斯在波利尼西亚群岛中重复和爆炸性的适应性辐射。使波利尼西亚拜登成为太平洋地区记录的最年轻和最快速的植物多样化事件。我们的研究结果表明,相对罕见的长距离扩散和创始事件物种形成,加上随后扩散潜力和岛内物种形成的丧失,可以解释拜登斯在波利尼西亚群岛中重复和爆炸性的适应性辐射。使波利尼西亚拜登成为太平洋地区记录的最年轻和最快速的植物多样化事件。我们的研究结果表明,相对罕见的长距离扩散和创始事件物种形成,加上随后扩散潜力和岛内物种形成的丧失,可以解释拜登斯在波利尼西亚群岛中重复和爆炸性的适应性辐射。
更新日期:2020-11-01
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