Distinct Processes Drive Diversification in Different Clades of Gesneriaceae
Distinct Processes Drive Diversification in Different Clades of Gesneriaceae
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DOI：
10.1093/sysbio/syw012
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发表时间：
2016-07-01
影响因子：
6.5
通讯作者：
Roberts, Wade R.
中科院分区：
文献类型：
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作者：
Roalson, Eric H.;Roberts, Wade R.
利用时间校准的系统发育假说，包括苦艾科768种(3300种)和来自26个基因区的29,000多个比对碱基，我们测试苦艾科多样化速率的变化以及这些变化的可能的近端驱动因素：地理分布、生长形式和授粉综合征。宏观进化混合物的贝叶斯分析发现，在贝斯勒亚科、核心线虫、核心柱亚科、核心链球属和太平洋水仙属中有五个显著的速率变化。这些速率变化与多样化速率的变化相对应，如二元状态物种形成和灭绝模型和地理状态物种形成和灭绝模型所推断的，与蜂鸟授粉、附生、单叶生长和地理区域有关。我们的结果表明，苦苣苔科不同分支的多样化进程是非常不同的，不同的特征组合影响着不同分支的多样化速率。新旧世界谱系之间的多样性格局表现出显著的差异，这表明苦艾科植物在这两个地理区域的多样性过程非常不同。
Using a time-calibrated phylogenetic hypothesis including 768 Gesneriaceae species (out of 3300 species) and more than 29,000 aligned bases from 26 gene regions, we test Gesneriaceae for diversification rate shifts and the possible proximal drivers of these shifts: geographic distributions, growth forms, and pollination syndromes. Bayesian Analysis of Macroevolutionary Mixtures analyses found five significant rate shifts in Beslerieae, core Nematanthus, core Columneinae, core Streptocarpus, and Pacific Cyrtandra. These rate shifts correspond with shifts in diversification rates, as inferred by Binary State Speciation and Extinction Model and Geographic State Speciation and Extinction model, associated with hummingbird pollination, epiphytism, unifoliate growth, and geographic area. Our results suggest that diversification processes are extremely variable across Gesneriaceae clades with different combinations of characters influencing diversification rates in different clades. Diversification patterns between New and Old World lineages show dramatic differences, suggesting that the processes of diversification in Gesneriaceae are very different in these two geographic regions.