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yexuqing木虫之王 (文学泰斗)
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Rising plant extinction rates on European mountain summits
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Rising plant extinction rates on European mountain summits 欧洲山峰植物灭绝速率上升 ▲ 作者：Johannes Wessely, Kry?tof Chytry et al. ▲链接： https://www.science.org/doi/10.1126/science.aed2974 ▲摘要：气候变化提高了高寒生态系统的植物物种丰富度。然而，这种多样性增加在多大程度上掩盖了本地物种的灭绝动态仍不清楚。研究者利用来自欧洲62座山峰896个永久植被样地的植被重调查数据，显示过去21年来局部灭绝事件有所增加。灭绝速率随变暖幅度增大而上升，物种在其海拔分布范围的下缘以及经历更强喜暖性转变的群落中更易灭绝。 此外，局部灭绝与先前丰度下降显著相关，后者可作为早期预警信号。这些发现表明，尽管植物物种丰富度在增加，林线以上的植物群落正面临加速但却被忽视的、最具特征物种的丧失。 ▲ Abstract：Climate change increases plant species richness in alpine ecosystems. However, to what extent this diversity enrichment masks extinction dynamics of resident species remains elusive. In this study, we used floristic resurvey data from 896 permanent vegetation plots across 62 European mountain summits to show that local extinctions have increased over the past 21 years. Extinction rates rose with the magnitude of warming, and species were more likely to go extinct toward their low-elevation range margins and in communities undergoing stronger thermophilization. Moreover, local extinctions were significantly related to preceding abundance declines, which can serve as an early warning signal. These findings suggest that despite increasing plant species richness, plant assemblages above the treeline face an accelerating but so far neglected loss of their most characteristic species. |
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