气候变化领域集成服务门户(CCPortal): Eocene emergence of highly calcifying coccolithophores despite declining atmospheric CO2

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DOI	10.1038/s41561-022-01006-0
	Eocene emergence of highly calcifying coccolithophores despite declining atmospheric CO2
	Claxton, L. M.; McClelland, H. L. O.; Hermoso, M.; Rickaby, R. E. M.
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	826
结束页码	+
卷号	15 期号:10 页码:8
英文摘要	Coccolithophores, a group of unicellular calcifying phytoplankton, have been major contributors to marine carbonate production since the calcite plates that they produce (coccoliths) first appeared in the fossil record over 200 million years ago (Ma). The response of this process to changes in environment on evolutionary timescales remains poorly understood, particularly in warm climates. Here we integrate a dataset consisting of carbon isotope ratios of size-separated coccolith calcite from marine sediments with a cell-scale model to interrogate cellular carbon fluxes and p(CO2) through the Eocene (similar to 55-34 Ma), Earth's hottest interval of the past 100 million years. We show that the large coccolithophores that rose to dominate the oceans through the Eocene have higher calcification-to-carbon fixation ratios than their predecessors while the opposite is true for smaller coccolithophores. These changes, which occurred in the context of increasing ocean alkalization, may have played a role in an apparent positive carbon cycle feedback to decreasing p(CO)(2). Our approach also provides independent support of multiproxy-based evidence for general p(CO)(2) decline through the Eocene in step with temperature. Together, this challenges the emerging view that a general decline in p(CO)(2) reduces calcification on evolutionary timescales.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000848696200002
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272552
作者单位	University of Oxford; University of Melbourne; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Universite de Lille - ISITE; Universite de Lille; Universite du Littoral-Cote-d'Opale
推荐引用方式 GB/T 7714	Claxton, L. M.,McClelland, H. L. O.,Hermoso, M.,et al. Eocene emergence of highly calcifying coccolithophores despite declining atmospheric CO2[J],2022,15(10):8.
APA	Claxton, L. M.,McClelland, H. L. O.,Hermoso, M.,&Rickaby, R. E. M..(2022).Eocene emergence of highly calcifying coccolithophores despite declining atmospheric CO2.NATURE GEOSCIENCE,15(10),8.
MLA	Claxton, L. M.,et al."Eocene emergence of highly calcifying coccolithophores despite declining atmospheric CO2".NATURE GEOSCIENCE 15.10(2022):8.