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A 90,000-year record of Afromontane forest responses to climate change
Science ( IF 56.9 ) Pub Date : 2019-01-10 , DOI: 10.1126/science.aav6821
Anne-Marie Lézine 1 , Kenji Izumi 2 , Masa Kageyama 2 , Gaston Achoundong 3
Affiliation  

Ancient changes in the African tropics Long-term records of past vegetation change are key to understanding how climate change affects ecosystems, but data are scarce—especially in highly biodiverse regions in the tropics. Lezine et al. present a detailed 90,000-year pollen core from an upland crater-lake site in the west African tropical montane forest, which is important from conservation and biogeographic standpoints. The upper treeline moved in response to climate change during the Pleistocene glacial and interglacial periods, whereas the lower limit of the Afromontane forest was stable. The constituent species of the forest also changed. This record resolves debates concerning the biogeographic history of Afromontane vegetation. Science, this issue p. 177 A pollen sequence from the Cameroon highlands reveals instability of the treeline in a fluctuating climate. Pollen records from African highlands are scarce; hence, the paleoecology of the Afromontane forest and its responses to glacial cycles are poorly known. Lake Bambili (Cameroon) provides a record of vegetation changes in the tropical mountains of Africa over the past 90,000 years, with high temporal resolution. Pollen data and biome reconstructions show a diverging response of forests to climate changes; the upper tree line was extremely unstable, shifting substantially in response to glacial-interglacial climate alternation, whereas the transition between the montane and lowland forests remained remarkably stable. Such ecological instability may have had a critical influence on species richness in the Afromontane forests.

中文翻译:

非洲山地森林应对气候变化的 90,000 年记录

非洲热带地区的古老变化 过去植被变化的长期记录是了解气候变化如何影响生态系统的关键,但数据很少——尤其是在热带生物多样性高的地区。Lezine 等人。展示了来自西非热带山地森林的一个高地火山口湖遗址的详细的 90,000 年花粉核心,这从保护和生物地理的角度来看很重要。在更新世冰期和间冰期,上层林线响应气候变化而移动,而非洲山地森林的下限则稳定。森林的构成物种也发生了变化。该记录解决了有关非洲山地植被生物地理历史的争论。科学,这个问题 p。177 喀麦隆高地的花粉序列揭示了气候波动中林木线的不稳定性。来自非洲高地的花粉记录很少;因此,非洲山地森林的古生态学及其对冰川循环的反应知之甚少。班比利湖(喀麦隆)提供了过去 90,000 年非洲热带山脉植被变化的记录,具有很高的时间分辨率。花粉数据和生物群落重建显示了森林对气候变化的不同反应;上层林木线极不稳定,随着冰期-间冰期气候变化而发生显着变化,而山地森林和低地森林之间的过渡却非常稳定。这种生态不稳定可能对非洲山地森林的物种丰富度产生了关键影响。
更新日期:2019-01-10
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