DOI: 10.1016/j.palaeo.2020.109637
论文题名: The Late Lutetian Thermal Maximum (middle Eocene): first record of deep-sea benthic foraminiferal response
作者: Rivero-Cuesta L. ; Westerhold T. ; Alegret L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 310182
出版年: 2020
卷: 545 语种: 英语
英文关键词: C19r event
; Hyperthermal
; Metabolic rates
; Paleoecology
; Paleoenvironment
; Site 702
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158299
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Rivero-Cuesta L.,Westerhold T.,Alegret L.. The Late Lutetian Thermal Maximum (middle Eocene): first record of deep-sea benthic foraminiferal response[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2020-01-01,545