Coupled microbial bloom and oxygenation decline recorded by magnetofossils during the Palaeocene-Eocene Thermal Maximum.

Coupled microbial bloom and oxygenation decline recorded by magnetofossils during the Palaeocene-Eocene Thermal Maximum.
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古新世-始新世最热期间磁化石记录的微生物大量繁殖和氧合作用下降的耦合

DOI:
10.1038/s41467-018-06472-y
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发表时间:
2018-10-01
影响因子:
16.6
通讯作者:
Zhao X
Zhao X
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chang L;Harrison RJ;Zeng F;Berndt TA;Roberts AP;Heslop D;Zhao X

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了解古新世-始新世最热期(PETM;~56Ma)(最明显的新生代短期全球变暖事件)期间的海洋环境变化和相关生物周转非常重要,因为海洋在大气二氧化碳减少中发挥着潜在作用,但追踪整个 PETM 期间海洋生产力和氧合的替代指标是有限的,结果仍然存在争议。在这里,我们展示了可以从保存完好的磁化石中提取南大西洋底层水氧化的高分辨率记录,磁化石是由趋磁细菌(MTB)使用新的多尺度环境磁方法产生的生物无机磁铁矿纳米晶体。我们的结果表明,由于养分供应增加,发生了短暂的 MTB 水华。从PETM开始到峰值,底层水氧合逐渐下降。这些观测结果提供了微生物对 PETM 反应的记录,并确立了磁化石作为古环境指标的价值。了解海洋生产力和二氧化碳减少对过去变暖事件的反应可以为未来提供重要的见解。在这里,作者使用细菌磁铁矿纳米颗粒化石来重建古新世-始新世热最大值期间的营养供应和海洋脱氧。
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. Understanding the response of marine productivity and CO2 drawdown to past warming events can provide important insights into the future. Here, the authors use bacterial magnetite nanoparticle fossils to reconstruct nutrient supply and marine deoxygenation during the Palaeocene–Eocene Thermal Maximum.
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