Vicariance or long-distance dispersal: historical biogeography of the pantropical subfamily Chrysophylloideae (Sapotaceae)
Vicariance or long-distance dispersal: historical biogeography of the pantropical subfamily Chrysophylloideae (Sapotaceae)
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DOI：
10.1111/j.1365-2699.2010.02389.x
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发表时间：
2011-01-01
影响因子：
3.9
通讯作者：
Swenson, Ulf
中科院分区：
文献类型：
--
作者：
Bartish, Igor V.;Antonelli, Alexandre;Swenson, Ulf
泛热带分类群的大陆分离可以用变异或远距离分散来解释。这些解释对形成当前分布的相对重要性可能有所不同，这取决于特定分类群的历史背景或生物学特征。本研究旨在确定泛热带菊亚科的地理起源，以及变异和扩散对其现代分布的影响。地理位置：非洲、大洋洲和南美洲的热带地区。方法利用最近发表的包括66个物种和9个分子标记的综合数据集。利用5个化石和惩罚似然法生成贝叶斯系统发育树并确定年代。使用最大似然分析和简约分析估计节点的分布范围。在生物地理和分子定年分析中，通过对从贝叶斯平稳样本中提取的2000多棵树的平均结果，考虑了系统发育和分支长度的不确定性。结果研究结果表明，金叶科植物最早的多样化发生在非洲坎帕阶，时间约为73 ~ 83 Ma。从非洲到新热带（1 - 3次分散）和澳大利亚（一次迁移）的殖民时间间隔较短，表明该亚科在白垩纪晚期到古新世早期（约62-72 Ma）的辐射相对较快。在新第三纪期间，从新热带回到非洲的单一扩散事件被推断出来。在澳大利亚和新喀里多尼亚之间至少发生了四次远距离传播，在非洲和马达加斯加之间多次传播。结论远途传播是黄蝶亚科分布范围扩大的主要机制。间隔性可以解释南美-澳大利亚通过南极洲的分离，但不能解释非洲和南美、新喀里多尼亚和澳大利亚之间的交流，或者这个亚科在马达加斯加的存在。北大西洋陆桥促进了古新世/始新世边界范围扩张的假设得到了较低的支持。
AimContinental disjunctions in pantropical taxa have been explained by vicariance or long-distance dispersal. The relative importance of these explanations in shaping current distributions may vary, depending on historical backgrounds or biological characteristics of particular taxa. We aimed to determine the geographical origin of the pantropical subfamily Chrysophylloideae (Sapotaceae) and the roles vicariance and dispersal have played in shaping its modern distribution.LocationTropical areas of Africa, Australasia and South America.MethodsWe utilized a recently published, comprehensive data set including 66 species and nine molecular markers. Bayesian phylogenetic trees were generated and dated using five fossils and the penalized likelihood approach. Distributional ranges of nodes were estimated using maximum likelihood and parsimony analyses. In both biogeographical and molecular dating analyses, phylogenetic and branch length uncertainty was taken into account by averaging the results over 2000 trees extracted from the Bayesian stationary sample.ResultsOur results indicate that the earliest diversification of Chrysophylloideae was in the Campanian of Africa c. 73-83 Ma. A narrow time interval for colonization from Africa to the Neotropics (one to three dispersals) and Australasia (a single migration) indicates a relatively rapid radiation of this subfamily in the latest Cretaceous to the earliest Palaeocene (c. 62-72 Ma). A single dispersal event from the Neotropics back to Africa during the Neogene was inferred. Long-distance dispersal between Australia and New Caledonia occurred at least four times, and between Africa and Madagascar on multiple occasions.Main conclusionsLong-distance dispersal has been the dominant mechanism for range expansion in the subfamily Chrysophylloideae. Vicariance could explain South American-Australian disjunction via Antarctica, but not the exchanges between Africa and South America and between New Caledonia and Australia, or the presence of the subfamily in Madagascar. We find low support for the hypothesis that the North Atlantic land bridge facilitated range expansions at the Palaeocene/Eocene boundary.