DOI: 10.1016/j.epsl.2018.09.010
Scopus记录号: 2-s2.0-85054432049
论文题名: Evolutionary driven of Gephyrocapsa coccolith isotopic vital effects over the past 400 ka
作者: Jin X. ; Liu C. ; Zhang H. ; Zhou C. ; Jiang X. ; Wu Z. ; Xu J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 503 起始页码: 236
结束页码: 247
语种: 英语
英文关键词: coccolith morphology
; coccolith stable isotopes
; coccolithophore growth rate
; Gephyrocapsa
; vital effects
Scopus关键词: Biomineralization
; Bone
; Calcification (biochemistry)
; Calcite
; Carbon
; Morphology
; Oxygen
; Seawater
; Carbonate system
; Coccolithophores
; Gephyrocapsa
; Isotopic fractionations
; Morphological parameters
; Paleoceanography
; Stable isotopes
; Vital effects
; Isotopes
; Gephyrocapsa
; Gephyrocapsa caribbeanica
; Gephyrocapsa oceanica
; Haptophyceae
英文摘要: Coccolithophores play important roles in marine biochemistry due to the processes of calcification and photosynthesis. Coccoliths are produced intracellularly, and cells produce coccoliths with stable isotopes distinct from theoretically precipitated inorganic calcite due to the influences of coccolithophore physiology, which are the so-called vital effects. The coccolith isotopic vital effects show large variations between species and hamper the use of coccolith isotopes in paleoceanography. In addition, learning the coccolith isotopic vital effects can help to better understand the carbon fractionation in coccolithophore cell, so as to provide a new insight in reconstructing sea water carbonate system (e.g., from alkenone δ13C or directly from coccolith δ13C) in geological past. In the present study, we investigated the morphological parameters, growth rate, and coccolith stable isotope compositions of Gephyrocapsa, the most universal alkenone-producing coccolithophore across the Pleistocene. These data allow us to estimate the influences of Gephyrocapsa morphology as well as the growth rate on coccolith vital effects. The results showed that Gephyrocapsa morphology, as well as coccolith isotopes, varied with species and morphotype changes, which were evolutionarily forced over the past 400 ka. The small Gephyrocapsa morphotypes (G. caribbeanica and Gephyrocapsa <3 μm) produced more robust coccoliths with relatively heavier isotopes for both carbon and oxygen than that of the larger-sized G. oceanica. The carbon and oxygen vital effects were significantly correlated and showed negative values, suggesting a kinetic effect on bicarbonate formation during calcification. The Gephyrocapsa growth rate showed a glacial–interglacial cyclicality, and had close relations with coccolith isotopic vital effects before MIS 8 when G. oceanica dominated. It is suggested that coccolith isotopic fractionation were influenced by coccolithophore growth rate, however these effects were superimposed on an evolutionary forced coccolithophore (coccolith) size changes. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109617
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China
Recommended Citation:
Jin X.,Liu C.,Zhang H.,et al. Evolutionary driven of Gephyrocapsa coccolith isotopic vital effects over the past 400 ka[J]. Earth and Planetary Science Letters,2018-01-01,503