Ancient marine sediment DNA reveals diatom transition in Antarctica.
Ancient marine sediment DNA reveals diatom transition in Antarctica.
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DOI：
10.1038/s41467-022-33494-4
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发表时间：
2022-10-02
影响因子：
16.6
通讯作者：
Zheng, Xufeng
中科院分区：
文献类型：
--
作者：
Armbrecht, Linda;Weber, Michael E.;Raymo, Maureen E.;Peck, Victoria L.;Williams, Trevor;Warnock, Jonathan;Kato, Yuji;Hernandez-Almeida, Ivan;Hoem, Frida;Reilly, Brendan;Hemming, Sidney;Bailey, Ian;Martos, Yasmina M.;Gutjahr, Marcus;Percuoco, Vincent;Allen, Claire;Brachfeld, Stefanie;Cardillo, Fabricio G.;Du, Zhiheng;Fauth, Gerson;Fogwill, Chris;Garcia, Marga;Glueder, Anna;Guitard, Michelle;Hwang, Ji-Hwan;Iizuka, Mutsumi;Kenlee, Bridget;O'Connell, Suzanne;Perez, Lara F.;Ronge, Thomas A.;Seki, Osamu;Tauxe, Lisa;Tripathi, Shubham;Zheng, Xufeng
南极洲是地球上最易受气候变化影响的地区之一，研究这一极地海洋生态系统过去和现在对环境变化的反应是一个紧迫事项。沉积古DNA（sedaDNA）分析可以提供对过去生态系统变化的见解。在这里，我们提出了认证（通过广泛的污染控制和sedaDNA损伤分析）宏基因组海洋真核生物sedaDNA从斯科舍海地区在IODP远征382。我们还提供了一个海洋真核生物sedaDNA记录~1 Mio。年和硅藻和绿藻sedaDNA追溯到~540 ka（使用分类标记基因SSU，LSU，psbO）。我们发现温暖阶段的证据与硅藻的相对丰度高有关，并且在~14.5 ka之前硅藻占所有真核生物的<10%，在此之后占~50%，即，在融水脉冲1A之后，伴随着从海冰到公海物种的组成变化。我们的研究表明，sedaDNA工具可以扩展到数十万年，为研究整个生态系统的海洋变化和整个多个冰川-间冰期循环的古生产力阶段开辟了道路。沉积的古DNA可以指示整个生态系统的变化。在这里，作者展示了南极斯科舍海温暖阶段和高硅藻丰度之间的关联，此外还展示了过去大约100万年的古真核生物沉积DNA。
Antarctica is one of the most vulnerable regions to climate change on Earth and studying the past and present responses of this polar marine ecosystem to environmental change is a matter of urgency. Sedimentary ancient DNA (sedaDNA) analysis can provide such insights into past ecosystem-wide changes. Here we present authenticated (through extensive contamination control and sedaDNA damage analysis) metagenomic marine eukaryote sedaDNA from the Scotia Sea region acquired during IODP Expedition 382. We also provide a marine eukaryote sedaDNA record of ~1 Mio. years and diatom and chlorophyte sedaDNA dating back to ~540 ka (using taxonomic marker genes SSU, LSU, psbO). We find evidence of warm phases being associated with high relative diatom abundance, and a marked transition from diatoms comprising <10% of all eukaryotes prior to ~14.5 ka, to ~50% after this time, i.e., following Meltwater Pulse 1A, alongside a composition change from sea-ice to open-ocean species. Our study demonstrates that sedaDNA tools can be expanded to hundreds of thousands of years, opening the pathway to the study of ecosystem-wide marine shifts and paleo-productivity phases throughout multiple glacial-interglacial cycles. Sedimentary ancient DNA can indicate ecosystem-wide changes. Here, the authors show association between warm phases and high diatom abundance in the Antarctic Scotia Sea, in addition to presenting ancient eukaryote sedimentary DNA spanning the last approximately 1 million years.
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影响因子：
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作者：
Coolen, MJL;Boere, A;Damsté, JSS
通讯作者：
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