Disentangling effects of droughts and heatwaves on alpine periphyton communities: A mesocosm experiment

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-10-26 DOI:10.1002/lol2.10445
Tamika Nagao, Rolf Vinebrooke
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Abstract

The accelerating rate of global climate change at higher elevations and latitudes is increasing the potential for extreme climatic events. Here, a knowledge gap exists in how the order of exposure to, and duration of droughts and heatwaves affect their cumulative impact on aquatic communities. We tested experimentally for the legacy effects of simultaneous vs. sequential exposures to drought and heatwave on sediment‐dwelling algal communities (epipelon) from small fishless alpine lakes. In both simultaneous, and sequential exposure treatments involving drought followed by a heatwave, the negative effect of drought masked the effects of warming on chlorophyll‐inferred algal biomass and taxonomic composition. Reversal of order of exposure (i.e., heatwave followed by drought) lowered their cumulative effect on community structure. These findings highlight the potential for drought events to dominate over heatwaves in altering shallow littoral ecosystems at high elevations under a rapidly warming climate.
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区分干旱和热浪对高山浮游生物群落的影响:中型宇宙实验
全球气候变化在高海拔和高纬度地区加速,增加了极端气候事件发生的可能性。在干旱和热浪的暴露顺序和持续时间如何影响它们对水生生物群落的累积影响方面,存在着知识空白。我们通过实验测试了同时暴露于干旱和热浪与先后暴露于干旱和热浪对无鱼高山小湖泊中沉积物栖息藻类群落(epipelon)的遗留影响。在先干旱后热浪的同时和顺序暴露处理中,干旱的负面影响掩盖了气候变暖对叶绿素推断的藻类生物量和分类组成的影响。暴露顺序的颠倒(即先热浪后干旱)降低了它们对群落结构的累积效应。这些发现突出表明,在气候迅速变暖的情况下,干旱事件有可能比热浪更容易改变高海拔地区的浅海沿岸生态系统。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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