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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Browning TJ,Achterberg EP,Yong JC,Rapp I,Utermann C,Engel A,Moore CMdoi
10.1038/ncomms15465subject
Has Abstractpub_date
2017-05-19 00:00:00pages
15465issn
2041-1723pii
ncomms15465journal_volume
8pub_type
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