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Microbial control of diatom bloom dynamics in the open ocean

Citation

Boyd, PW and Strzepek, R and Chiswell, S and Chang, H and DeBruyn, JM and Ellwood, M and Keenan, s and King, AL and Maas, EW and Nodder, S and Sander, SG and Sutton, P and Twining, BS and Wilhelm, SW and Hutchins, DA, Microbial control of diatom bloom dynamics in the open ocean, Geophysical Research Letters, 39, (18) Article L18601. ISSN 0094-8276 (2012) [Refereed Article]


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Copyright Statement

Copyright 2012 American Geophysical Union.

DOI: doi:10.1029/2012GL053448

Abstract

Diatom blooms play a central role in supporting foodwebs and sequestering biogenic carbon to depth. Oceanic conditions set bloom initiation, whereas both environmental and ecological factors determine bloom magnitude and longevity. Our study reveals another fundamental determinant of bloom dynamics. A diatom spring bloom in offshore New Zealand waters was likely terminated by iron limitation, even though diatoms consumed <1/3 of the mixed-layer dissolved iron inventory. Thus, bloom duration and magnitude were primarily set by competition for dissolved iron between microbes and small phytoplankton versus diatoms. Significantly, such a microbial mode of control probably relies both upon out-competing diatoms for iron (i.e.,K-strategy), and having high iron requirements (i.e.,r-strategy). Such resource competition for iron has implications for carbon biogeochemistry, as, blooming diatoms fixed three-fold more carbon per unit iron than resident non-blooming microbes. Microbial sequestration of iron has major ramifications for determining the biogeochemical imprint of oceanic diatom blooms.

Item Details

Item Type:Refereed Article
Keywords:bloom dynamics, dissolved iron, ecological factors, iron-limitation, microbial control, mode of control, New Zealand, oceanic conditions, open ocean, per unit, spring blooms
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Change Adaptation Measures
Author:Boyd, PW (Professor Philip Boyd)
ID Code:95559
Year Published:2012
Web of Science® Times Cited:32
Deposited By:IMAS Research and Education Centre
Deposited On:2014-10-03
Last Modified:2014-11-18
Downloads:177 View Download Statistics

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