Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-06472-y
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Funding
- US National Science Foundation
- National Natural Science Foundation of China [41574060, 41722402]
- Opening Foundation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology [MGQNLM201701]
- 1000 Talents Plan program of China
- European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC grant [320750]
- Boya Postdoctoral Fellowship from Peking University
- ARC [DP120103952, DP140104544, DP160100805]
- National Institute of Advanced Industrial Science and Technology, Ministry of Economy, Trade and Industry, Japan
- Australia-New Zealand IODP Consortium (ANZIC)
- Australian Government through the Australian Research Council's LIEF funding scheme [LE140100047]
- Australian consortium of university
- New Zealand consortium of university
- Australian government agency
- New Zealand government agency
- Australian Research Council [LE140100047] Funding Source: Australian Research Council
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Understanding marine environmental change and associated biological turnover across the Palaeocene-Eocene Thermal Maximum (PETM; -56 Ma)-the most pronounced Cenozoic short-term global warming event-is important because of the potential role of the ocean in atmospheric CO2 drawdown, yet proxies for tracing marine productivity and oxygenation across the PETM are limited and results remain controversial. Here we show that a high-resolution record of South Atlantic Ocean bottom water oxygenation can be extracted from exceptionally preserved magnetofossils-the bioinorganic magnetite nanocrystals produced by magnetotactic bacteria (MTB) using a new multiscale environmental magnetic approach. Our results suggest that a transient MTB bloom occurred due to increased nutrient supply. Bottom water oxygenation decreased gradually from the onset to the peak PETM. These observations provide a record of microbial response to the PETM and establish the value of magnetofossils as palaeoenvironmental indicators.
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