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Zinc isotope fractionation by Emiliania huxleyi cultured across a range of free zinc ion concentrations

Citation

Samanta, M and Ellwood, MJ and Strzepek, RF, Zinc isotope fractionation by Emiliania huxleyi cultured across a range of free zinc ion concentrations, Limnology and Oceanography, 63, (2) pp. 660-671. ISSN 0024-3590 (2018) [Refereed Article]

Copyright Statement

Copyright 2017 Association for the Sciences of Limnology and Oceanography

DOI: doi:10.1002/lno.10658

Abstract

Zinc (Zn) isotope fractionation by the coccolithophore Emiliania huxleyi (a Tasman Sea isolate) was investigated by culturing it across a range of free Zn2+ ion concentrations (1.2 pmol L−1 to 3.2 nmol L−1), which span the natural range observed in the global oceans. Across the range of free Zn2+ ion concentrations tested, the amount of bio-available Zn did not have any appreciable influence on the specific growth rate or cell morphology of E. huxleyi. However, a suite of secondary physiological indicators reflected changes in Zn bioavailability. An increase in the photosynthetic efficiency of photosystem II (Fv/Fm) was observed with increasing free Zn2+ ion concentration. The time constants for electron transport from QA to QB and from QB to the plastoquinone (PQ) pool decreased as the free Zn2+ ion concentration increased, reflecting enhanced photosynthetic electron transport. The effect of Zn bioavailability on photosynthetic physiology was speculated to be due to increased activity of carbonic anhydrase with increasing Zn bioavailability. Zinc uptake by E. huxleyi resulted in Zn isotope fractionation and the Δ66Zncells-media ranged between −0.6 and −0.2. The major finding from this work is that the lighter Zn isotope is taken up preferentially by this coccolithophore, making the dissolved Zn composition of the surrounding seawater isotopically heavier.

Item Details

Item Type:Refereed Article
Keywords:zinc, isotope, fractionation, Emiliania huxleyi, coccolithophore
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Biological oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Oceanic processes (excl. in the Antarctic and Southern Ocean)
UTAS Author:Strzepek, RF (Dr Robert Strzepek)
ID Code:148045
Year Published:2018
Web of Science® Times Cited:18
Deposited By:Australian Antarctic Program Partnership
Deposited On:2021-11-30
Last Modified:2022-01-04
Downloads:0

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