DOI: 10.1016/j.palaeo.2014.10.004
论文题名: Benthic foraminiferal response to the Middle Eocene Climatic Optimum (MECO) in the South-Eastern Atlantic (ODP Site 1263)
作者: Boscolo Galazzo F. ; Thomas E. ; Giusberti L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 417 起始页码: 432
结束页码: 444
语种: 英语
英文关键词: Benthic foraminifera
; Global warming
; MECO
; Phytodetritus
; Walvis ridge
英文摘要: The response of marine biota to the Middle Eocene Climatic Optimum (MECO) is still poorly constrained. Specifically, changes in deep-sea benthic foraminiferal faunas have been documented at few locations only. We carried out a quantitative study of benthic foraminiferal assemblages at lower-bathyal ODP Site 1263 (Walvis Ridge, SE Atlantic), providing documentation of the response of benthic foraminiferal assemblage to the MECO in an open ocean setting. There was no major temporary or persistent assemblage turnover in benthic foraminiferal faunas in the SE Atlantic Ocean. The benthic foraminiferal accumulation rates (BFAR) and assemblage composition indicate that the delivery of food to the seafloor increased during the early stages of surface and deep-sea warming. During this period, the absolute and relative abundance of phytodetritus exploiters increased pronouncedly, indicating that the increase in the flux of organic matter to the sea floor was largely seasonal or otherwise pulsed. During later stages and peak warming of MECO, in contrast, the flux of organic matter to the seafloor declined markedly, as shown by a decrease in both infaunal and epifaunal benthic foraminiferal accumulation rates. The low flux of organic matter during the more extreme parts of the MECO thus did not favor one of these broad groups, but affected all common taxa. Paleoceanographic reconstructions combined with data on benthic foraminifera suggest that the MECO warming was the main cause of the reduction in the flux of organic matter to the sea floor, by increasing the metabolic rates of pelagic consumers, which thus used more food, preventing it from reaching the sea floor, as well as increasing remineralization of organic matter in the water column. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69130
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geosciences, University of Padova, Via G. Gradenigo 6, Padova, Italy; Department of Geology and Geophysics, Yale University, 210 Whitney Avenue, New Haven, United States; Department of Earth and Environmental Sciences, Wesleyan University, 45 Wyllys Avenue, Middletown, United States
Recommended Citation:
Boscolo Galazzo F.,Thomas E.,Giusberti L.. Benthic foraminiferal response to the Middle Eocene Climatic Optimum (MECO) in the South-Eastern Atlantic (ODP Site 1263)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,417