Diatom response to climatic warming over the last 200 years: A record from Gonghai Lake, North China
Diatom response to climatic warming over the last 200 years: A record from Gonghai Lake, North China
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近200年来硅藻对气候变暖的响应：来自中国北方公海湖的记录
DOI：
10.1016/j.palaeo.2017.12.023
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Wan Xiaoqiao
中科院分区：
文献类型：
--
作者：
Yan Yao;Wang Luo;Li Jie;Li Jingjing;Zou Yafei;Zhang Jiaoyang;Li Peng;Liu Yuan;Xu Bing;Gu Zhaoyan;Wan Xiaoqiao
年度监测数据以及百年和千年尺度的古湖泊记录显示，许多高海拔湖泊的小细胞浮游硅藻种类相对于较重的分流浮游硅藻和小型底栖硅藻有所增加，这可能是对最近气候变暖的反应。除了湖泊硅藻组合的组成和结构发生变化外，硅藻生物多样性也发生了变化；然而，这些变化在区域上并不一致。在这项研究中，我们选择了一个温带的中纬度湖泊来探索硅藻组合和生物多样性变化对近期气候变暖的响应。硅藻的记录跨越了过去大约200年，揭示了自1966年以来，小细胞的Cylotellaocellata+stelligera已经取代了以前占主导地位的大细胞浮游植物--施罗泰利环藻。这些变化与全球平均地表温度上升的趋势是一致的。生物多样性从1966年开始显著增加，但在1990年后开始下降，可能是对快速气候变暖的反应。研究结果表明，硅藻生物多样性对气候变化的响应是一个非线性过程。
Annual monitoring data and centennial and millennial-scale paleolimnological records have revealed an increase in small-celled planktonic diatom species relative to heavier tycho-planktonic and small benthic diatoms in many high-altitude lakes, presumably in response to recent climatic warming. In addition to changes in the composition and structure of lacustrine diatom assemblages, there have also been changes in diatom biodiversity; however, these changes are not regionally consistent. In this study, we chose a temperate mid-latitude lake to explore the response of changes in diatom assemblages and biodiversity to recent climatic warming. The diatom record spans the past ca. 200 years and reveals that since 1966 CE the small-celledCyclotellaocellata+stelligerahas replaced the previously dominant, large-celled phytoplanktonCyclotella schroeteri. These changes are in accordance with the increasing trend in global mean surface temperature. Biodiversity increased remarkably from 1966 CE, but began to decline after 1990 CE, presumably in response to rapid climatic warming. Our findings indicate that the response of diatom biodiversity to climate change was a nonlinear process.