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Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic

Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic
Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic
In certain regions of the predominantly nitrogen limited ocean, microbes can become co-limited by phosphorus. Within such regions, a proportion of the dissolved organic phosphorus pool can be accessed by microbes employing a variety of alkaline phosphatase (APase) enzymes. In contrast to the PhoA family of APases that utilize zinc as a cofactor, the recent discovery of iron as a cofactor in the more widespread PhoX and PhoD implies the potential for a biochemically dependant interplay between oceanic zinc, iron and phosphorus cycles. Here we demonstrate enhanced natural community APase activity following iron amendment within the low zinc and moderately low iron Western North Atlantic. In contrast we find no evidence for trace metal limitation of APase activity beneath the Saharan dust plume in the Eastern Atlantic. Such intermittent iron limitation of microbial phosphorus acquisition provides an additional facet in the argument for iron controlling the coupling between oceanic nitrogen and phosphorus cycles.
Browning, Thomas
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Achterberg, Eric
685ce961-8c45-4503-9f03-50f6561202b9
Yong, Jaw
d67f0e24-2813-4fc3-8ef8-a7d33852a52f
Rapp, Insa
acd4e6c1-eeb1-44d8-873c-50520280ed09
Utermann, Caroline
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Engel, Anja
f0a8db1d-c2b1-43e5-969a-e7f5b29cdf88
Moore, Christopher
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Browning, Thomas
5580b9f3-6c6d-4729-8d92-403244e639bf
Achterberg, Eric
685ce961-8c45-4503-9f03-50f6561202b9
Yong, Jaw
d67f0e24-2813-4fc3-8ef8-a7d33852a52f
Rapp, Insa
acd4e6c1-eeb1-44d8-873c-50520280ed09
Utermann, Caroline
04aa9cb5-e52c-4110-a609-77abce52301e
Engel, Anja
f0a8db1d-c2b1-43e5-969a-e7f5b29cdf88
Moore, Christopher
7ec80b7b-bedc-4dd5-8924-0f5d01927b12

Browning, Thomas, Achterberg, Eric, Yong, Jaw, Rapp, Insa, Utermann, Caroline, Engel, Anja and Moore, Christopher (2017) Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic. Nature Communications, 8. (doi:10.1038/ncomms15465).

Record type: Article

Abstract

In certain regions of the predominantly nitrogen limited ocean, microbes can become co-limited by phosphorus. Within such regions, a proportion of the dissolved organic phosphorus pool can be accessed by microbes employing a variety of alkaline phosphatase (APase) enzymes. In contrast to the PhoA family of APases that utilize zinc as a cofactor, the recent discovery of iron as a cofactor in the more widespread PhoX and PhoD implies the potential for a biochemically dependant interplay between oceanic zinc, iron and phosphorus cycles. Here we demonstrate enhanced natural community APase activity following iron amendment within the low zinc and moderately low iron Western North Atlantic. In contrast we find no evidence for trace metal limitation of APase activity beneath the Saharan dust plume in the Eastern Atlantic. Such intermittent iron limitation of microbial phosphorus acquisition provides an additional facet in the argument for iron controlling the coupling between oceanic nitrogen and phosphorus cycles.

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Accepted/In Press date: 31 March 2017
e-pub ahead of print date: 19 May 2017
Organisations: Marine Biogeochemistry

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Local EPrints ID: 410060
URI: https://eprints.soton.ac.uk/id/eprint/410060
PURE UUID: 65092ef9-c963-4ddf-a222-8eec37a49565

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Date deposited: 02 Jun 2017 04:01
Last modified: 14 Aug 2019 17:34

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Contributors

Author: Thomas Browning
Author: Eric Achterberg
Author: Jaw Yong
Author: Insa Rapp
Author: Caroline Utermann
Author: Anja Engel

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