气候变化领域集成服务门户(CCPortal): The Late Lutetian Thermal Maximum (middle Eocene): first record of deep-sea benthic foraminiferal response

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DOI	10.1016/j.palaeo.2020.109637
	The Late Lutetian Thermal Maximum (middle Eocene): first record of deep-sea benthic foraminiferal response
	Rivero-Cuesta L.; Westerhold T.; Alegret L.
发表日期	2020
ISSN	0031-0182
卷号	545
英文摘要	Understanding the role of deep-sea biota across global warming events in the past is key to unravel climate system dynamics during periods of increased pCO2 levels. Here we present the first record of the benthic foraminiferal response to a middle Eocene transient warming event named the Late Lutetian Thermal Maximum (LLTM; 41.52 Ma) at ODP Site 702 in the South Atlantic Ocean. Changes in benthic foraminiferal assemblages such as a decrease in absolute abundance of certain taxa (e.g. Bulimina elongata) are correlated with the negative carbon isotope excursion corresponding to the LLTM event. Paleoecological interpretations of the assemblage turnover suggest changes in the type of organic matter arriving to the seafloor during the LLTM. Benthic foraminifera and coarse fraction accumulation rates (BFARs and CFARs) decreased across the warming period of the LLTM, coeval with the negative δ18O excursion associated with ~2 °C deep-sea warming. We suggest that increased temperatures led to enhanced metabolic rates in heterotroph organisms such as foraminifera, triggering a population decline in food-limiting environments such as the meso-oligotrophic setting of Site 702. A similar ecological response and a decrease in export productivity, as inferred from decreased CFARs and BFARs, have also been reported across the Middle Eocene Climatic Optimum at this site, and support the hypothesis that metabolic rates accelerated during warming events, in spite of their different magnitude and duration. © 2020 Elsevier B.V.
英文关键词	C19r event; Hyperthermal; Metabolic rates; Paleoecology; Paleoenvironment; Site 702
语种	英语
scopus关键词	abundance; carbon isotope; foraminifera; global warming; Lutetian; metabolism; Ocean Drilling Program; organic matter; paleoecology; paleoenvironment; seafloor; Atlantic Ocean; Atlantic Ocean (South); Bulimina elongata; Foraminifera
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150566
作者单位	Departamento de Ciencias de la Tierra & Instituto Universitario de Ciencias Ambientales (IUCA), Universidad de Zaragoza, Spain; MARUM – Center for Marine and Environmental Sciences, University of Bremen, Germany
推荐引用方式 GB/T 7714	Rivero-Cuesta L.,Westerhold T.,Alegret L.. The Late Lutetian Thermal Maximum (middle Eocene): first record of deep-sea benthic foraminiferal response[J],2020,545.
APA	Rivero-Cuesta L.,Westerhold T.,&Alegret L..(2020).The Late Lutetian Thermal Maximum (middle Eocene): first record of deep-sea benthic foraminiferal response.Palaeogeography, Palaeoclimatology, Palaeoecology,545.
MLA	Rivero-Cuesta L.,et al."The Late Lutetian Thermal Maximum (middle Eocene): first record of deep-sea benthic foraminiferal response".Palaeogeography, Palaeoclimatology, Palaeoecology 545(2020).