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A biogeographic perspective on the evolution of fire syndromes in pine trees (Pinus: Pinaceae)

机译:从生物地理学角度看松树火灾综合征的演变(松:松科)

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摘要

Our goals were to explore the relationship between biogeography and the evolution of fire-adaptive syndromes in the genus Pinus. We used a previously published time-calibrated phylogeny and conducted ancestral trait reconstruction to estimate the likely timing of diversification in Pinus, and to determine when fire-adaptive syndromes evolved in the lineage. To explore trait conservation among fire syndromes and to investigate historical biogeography, we constructed ancestral state reconstructions using the program RASP and estimated the degree of conservatism for fire-adapted traits in the program BaTS. Our reconstructions suggest that the Bering land bridge, which connected North America and Asia, probably played a major role in early pine evolution. Our estimates indicated that fire-adaptive syndromes seem to have evolved more frequently in New World taxa and probably are related to the uplift of major North American mountain ranges. Our data suggest that certain geographically widespread adaptations to fire evolved repeatedly, possibly due to localized changes in climate and environment, rather than resulting from large dispersal events of pre-adapted individuals.
机译:我们的目标是探索生物地理学与松属中火适应性综合征的演变之间的关系。我们使用了以前发布的经过时间校准的系统发育树,并进行了祖先特征重建,以估计松树多样化的可能时间,并确定火系适应症何时在世系中进化。为了探究火灾综合症之间的特征保存并调查历史生物地理学,我们使用RASP程序构建了祖先状态重建,并在BaTS程序中估计了适合火灾的特征的保守程度。我们的重建表明,连接北美和亚洲的白令陆桥可能在早期松树演化中发挥了重要作用。我们的估计表明,火适应性综合征在新世界的生物分类中似乎发展得更为频繁,并且可能与北美主要山脉的隆升有关。我们的数据表明,某些地理上广泛适用于火灾的适应性变化是反复发生的,这可能是由于气候和环境的局部变化所致,而不是由预先适应个体的大规模散布事件引起的。

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