Kritika M Garg, Balaji Chattopadhyay, Bonny Koane, Katerina Sam, Frank E Rheindt
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引用次数: 0
摘要
背景:第四纪的气候波动是生物多样性的动力。众所周知,全球降温周期(如末次冰川极盛期)将高纬度动植物群的活动范围分割成更小的避难所,从而大大缩小了物种的分布范围。然而,人们对降温周期对热带生物群的影响了解相对较少:我们分析了巴布亚新几内亚最高峰威廉山(Mt. Wilhelm)海拔梯度上的山地森林中三种密切相关的林下栖息恙虫(Sericornis 和 Aethomyias; Aves)的数千个全基因组 DNA 标记。尽管在海拔偏好方面存在物种特异性差异,但我们在每个灌丛鹩莺物种内部都发现了有限的分化,但在 27-29 ka 期间发现了同步种群扩张的强烈基因组特征,这与 LGM 的开始时间相吻合:结论:所有三个物种种群扩张的显著同步时间表明了全球冷却周期在扩大高原栖息地方面的重要性。全球降温周期对热带高原地区与北方和温带纬度地区的影响可能截然不同,前者导致了种群扩张,后者则导致了严重的破碎化。
Last Glacial Maximum led to community-wide population expansion in a montane songbird radiation in highland Papua New Guinea.
Background: Quaternary climate fluctuations are an engine of biotic diversification. Global cooling cycles, such as the Last Glacial Maximum (LGM), are known to have fragmented the ranges of higher-latitude fauna and flora into smaller refugia, dramatically reducing species ranges. However, relatively less is known about the effects of cooling cycles on tropical biota.
Results: We analyzed thousands of genome-wide DNA markers across an assemblage of three closely related understorey-inhabiting scrubwrens (Sericornis and Aethomyias; Aves) from montane forest along an elevational gradient on Mt. Wilhelm, the highest mountain of Papua New Guinea. Despite species-specific differences in elevational preference, we found limited differentiation within each scrubwren species, but detected a strong genomic signature of simultaneous population expansions at 27-29 ka, coinciding with the onset of the LGM.
Conclusion: The remarkable synchronous timing of population expansions of all three species demonstrates the importance of global cooling cycles in expanding highland habitat. Global cooling cycles have likely had strongly different impacts on tropical montane areas versus boreal and temperate latitudes, leading to population expansions in the former and serious fragmentation in the latter.
期刊介绍:
BMC Evolutionary Biology is an open access, peer-reviewed journal that considers articles on all aspects of molecular and non-molecular evolution of all organisms, as well as phylogenetics and palaeontology.