While climate change affects the phytoplankton biodiversity at both local and global scales, predicting phytoplankton community responses to warming is impaired by their polyphyletic complexity. High mountain lakes are highly vulnerable systems, partly due to their limited biodiversity, and forecasting their ecological trajectories is a key challenge for scientists and conservation managers. We evaluated the phytoplankton's sensitivity to temperature in 24 high‐altitude lakes over a multi‐year (average 7‐year) study. We detected assemblage‐specific responses to warming, with different trends in biovolume and diversity observed among the diatom‐dominant, mixed‐mixotrophs dominant, and colonial‐green dominant assemblages. The environmental settings partly governed assemblage responses, highlighting the role of the landscape filters in determining the response to warming. The biological stability of lakes, that is, their ability to resist shifts in their phytoplankton assemblage, is therefore determined both by the lake characteristics and warming intensity.

中文翻译：

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脆弱但不相等：高山湖泊表现出浮游植物对气候变化反应的异质模式

虽然气候变化在局部和全球范围内影响浮游植物生物多样性，但预测浮游植物群落对变暖的反应会受到其多系复杂性的影响。高山湖泊是高度脆弱的系统，部分原因是其生物多样性有限，预测其生态轨迹是科学家和保护管理人员面临的一项关键挑战。我们在一项多年（平均 7 年）研究中评估了 24 个高海拔湖泊中浮游植物对温度的敏感性。我们检测到了组合对变暖的特异性响应，在硅藻为主、混合混合营养生物为主和殖民地绿色为主的组合中观察到生物体积和多样性的不同趋势。环境设置在一定程度上控制了组合响应，突出了景观过滤器在决定对变暖的响应中的作用。因此，湖泊的生物稳定性，即它们抵抗浮游植物组合变化的能力，既取决于湖泊特征，也取决于变暖强度。