Is dispersal mode a driver of diversification and geographical distribution in the tropical plant family Melastomataceae?,Molecular Phylogenetics and Evolution

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Is dispersal mode a driver of diversification and geographical distribution in the tropical plant family Melastomataceae?
Molecular Phylogenetics and Evolution ( IF 3.6 ) Pub Date : 2020-04-09 , DOI: 10.1016/j.ympev.2020.106815
Marcelo Reginato ₁ , Thais N C Vasconcelos ₂ , Ricardo Kriebel ₃ , André Olmos Simões ₄

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Species of plants with different life history strategies may differ in their seed dispersal mechanisms, impacting their distribution and diversification patterns. Shorter or longer distance dispersal is favored by different dispersal modes, facilitating (or constraining) population isolation, which can, in turn, impact speciation and species range sizes. While these associations are intuitive, few studies have explicitly tested these hypotheses for large clades of angiosperms. The plant family Melastomataceae is found on disparate habitats with different dispersal modes, representing a good model to address these questions. In this study, we reconstruct the phylogeny of Melastomataceae and gather data on their dispersal mode and range size to test the impact of dispersal mode on diversification and range size evolution. We found that abiotic dispersal is ancestral in the family, while biotic dispersal evolved multiple times. Species richness distribution is very similar across dispersal modes, although abiotically dispersed species tend to be relatively more diverse in seasonal environments. Range sizes across dispersal modes are not significantly different, although biotically dispersed species have slightly wider distributions. Model comparisons indicate that factors other than dispersal mode might have driven diversification heterogeneity. We did not find evidence for the role of dispersal mode driving diversification rates or range size in the Melastomataceae, suggesting a complex macroevolutionary scenario for this diverse angiosperm family. The bulk of changes to biotic dispersal coinciding with an increase in passerine diversification suggests a possible "past" key innovation in Melastomataceae. Future studies should investigate the role of other diversification drivers in the family and the relatively higher diversity of abiotically dispersed species in open habitats.

中文翻译：

分散模式是否是热带植物梅花科的多样化和地理分布的驱动力？

具有不同生活史策略的植物物种的种子传播机制可能不同，从而影响其分布和多样化模式。较短或较长距离的散布受不同散布方式的影响，有利于（或限制）种群隔离，这反过来又会影响物种形成和物种范围大小。尽管这些关联是直观的，但很少有研究明确地针对大型被子植物这些假设进行了检验。桔梗科植物家族分布在具有不同扩散模式的不同生境中，代表了解决这些问题的良好模式。在这项研究中，我们重建了桔梗科的系统发育，并收集了有关其分散模式和范围大小的数据，以测试分散模式对多样化和范围大小演变的影响。我们发现非生物扩散是家族中的祖先，而生物扩散则进化了多次。尽管非生物分散的物种在季节性环境中相对更加多样化，但物种的丰富度分布在各个扩散模式下非常相似。尽管生物分散的物种的分布范围稍宽，但在各个传播模式下的范围大小没有显着差异。模型比较表明，分散模式以外的其他因素可能会推动多元化的异质性。我们没有找到证据证明散叶模式在美兰科中驱动多样化速率或范围大小的作用，这表明该多样化被子植物家族存在复杂的宏观进化情况。生物分散的大量变化与雀形花酯多样化的增加相吻合，这表明美白菊科可能存在“过去”的关键创新。未来的研究应调查其他多样化驱动因素在家庭中的作用，以及在开放生境中非生物分散物种相对较高的多样性。

更新日期：2020-04-09

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