Extinction of austral diatoms in response to large-scale climate dynamics in Antarctica.

Extinction of austral diatoms in response to large-scale climate dynamics in Antarctica.
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南极洲大规模气候动态导致的南方硅藻灭绝。

DOI:
10.1126/sciadv.abh3233
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发表时间:
2021-09-17
期刊:
影响因子:
13.6
通讯作者:
Vyverman W
Vyverman W
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Pinseel E;Van de Vijver B;Wolfe AP;Harper M;Antoniades D;Ashworth AC;Ector L;Lewis AR;Perren B;Hodgson DA;Sabbe K;Verleyen E;Vyverman W

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中新世和更新世古湖沉积物为南极大陆硅藻植物区系的演化提供了独特的视角。尽管有证据表明存在微生物特有现象,但人们仍然难以了解地质和古气候事件对区域原生生物群落演化的影响。在这里,我们利用中新世中期和第四纪南极洲的湖泊化石,深入了解南极淡水硅藻的生物地理历史,并将该数据集与现代淡水硅藻群落的全球清单相吻合。我们揭示了多种中新世硅藻植物群的存在,与几个前冈瓦纳大陆有相似之处。中新世的冷却和上新世-更新世的冰川作用引发了多次灭绝波,导致该植物群选择性减少。尽管灭绝占主导地位,但原地物种形成和新的殖民最终塑造了物种贫乏、但高度适应且很大程度上是地方性的现代南极硅藻植物群。我们的研究结果为新近纪和更新世南极洲的生物多样性周转规模提供了比宏观化石提供的碎片视角更全面的视角,并强调了湖泊微生物群对大规模气候扰动的敏感性。
Miocene and Pleistocene paleolake sediments provide a unique view on the evolution of continental Antarctica’s diatom flora. Despite evidence for microbial endemism, an understanding of the impact of geological and paleoclimate events on the evolution of regional protist communities remains elusive. Here, we provide insights into the biogeographical history of Antarctic freshwater diatoms, using lacustrine fossils from mid-Miocene and Quaternary Antarctica, and dovetail this dataset with a global inventory of modern freshwater diatom communities. We reveal the existence of a diverse mid-Miocene diatom flora bearing similarities with several former Gondwanan landmasses. Miocene cooling and Plio-Pleistocene glaciations triggered multiple extinction waves, resulting in the selective depauperation of this flora. Although extinction dominated, in situ speciation and new colonizations ultimately shaped the species-poor, yet highly adapted and largely endemic, modern Antarctic diatom flora. Our results provide a more holistic view on the scale of biodiversity turnover in Neogene and Pleistocene Antarctica than the fragmentary perspective offered by macrofossils and underscore the sensitivity of lacustrine microbiota to large-scale climate perturbations.
DOI: 10.1371/journal.pone.0198003
发表时间: 2018
期刊: PloS one
影响因子: 3.7
作者:
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DOI: 10.1093/bioinformatics/btv428
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期刊: Bioinformatics (Oxford, England)
影响因子: --
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