Mg isotopes in chlorophyll-a and coccoliths of cultured coccolithophores (Emiliania huxleyi) by MC-ICP-MS SCIE SCOPUS

Cited 19 time in WEB OF SCIENCE Cited 20 time in Scopus
Title
Mg isotopes in chlorophyll-a and coccoliths of cultured coccolithophores (Emiliania huxleyi) by MC-ICP-MS
Author(s)
Ra, Kongtae; Kitagawa, Hiroyuki; Shiraiwa, Yoshihiro
KIOST Author(s)
Ra, Kong Tae(나공태)
Publication Year
2010-10
Abstract
We present the Mg isotope composition and fractionation of chlorophyll-a and coccoliths using cultured coccolithophores that were grown at three different temperatures. The overall variations in delta(26)Mg values over a range of temperatures from 10 to 25 degrees C were 1.91%. and 1.37% for chlorophyll-a and coccoliths, respectively. Chlorophyll-a and coccoliths of E. huxleyi were slightly depleted in heavier isotopes relative to the culture medium. The isotope fractionation of coccoliths relative to culture medium was larger than that of chlorophyll-a. delta(26)Mg of chlorophyll-a and coccoliths showed temperature dependence of about 0.10 parts per thousand/degrees C for chlorophyll-a and 0.06-0.10 parts per thousand/degrees C for coccoliths. delta(26)Mg values in chlorophyll-a and coccoliths from the stationary phase were isotopically much lighter than those from the late exponential phase. There was a significant correlation between the delta(26)Mg values of coccoliths and chlorophyll-a, suggesting that a growth rate-dependent step occurs during the initial acquisition of Mg from the culture medium. Additionally, a positive relationship was observed between epsilon(26)Mg of either chlorophyll-a or coccoliths and the growth rates, indicating that Mg isotopic fractionation could be influenced by the growth rate. Further Mg isotope studies in coccoliths may provide a useful tool for coccolithophores productivity, especially with respect to the coccoliths' growth rate. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
ISSN
0304-4203
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4032
DOI
10.1016/j.marchem.2010.07.004
Bibliographic Citation
MARINE CHEMISTRY, v.122, no.1-4, pp.130 - 137, 2010
Publisher
ELSEVIER SCIENCE BV
Subject
GEPHYROCAPSA-OCEANICA; INORGANIC CARBON; SARGASSO SEA; GROWTH-RATE; BLACK-SEA; MAGNESIUM; CALCIFICATION; FRACTIONATION; BIOMINERALIZATION; PHOTOSYNTHESIS
Keywords
Mg isotope; Chlorophyll-a; Coccoliths; E. huxleyi; Coccolithophores
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine chemistry,Isotope Biogeochemistry,Environmental Forensic,해양화학,동위원소 생지화학,환경법의학

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