Microbial control of diatom bloom dynamics in the open ocean

被引:65
作者
Boyd, Philip W. [1 ,2 ]
Strzepek, Robert
Chiswell, Steve [2 ]
Chang, Hoe [2 ]
DeBruyn, Jennifer M. [3 ]
Ellwood, Michael [4 ]
Keenan, Sean [2 ,5 ]
King, Andrew L. [6 ,7 ]
Maas, Elisabeth W. [2 ]
Nodder, Scott [2 ]
Sander, Sylvia G.
Sutton, Philip [2 ]
Twining, Benjamin S. [8 ]
Wilhelm, Steven W. [9 ]
Hutchins, David A. [6 ]
机构
[1] Univ Otago, NIWA Ctr Chem & Phys Oceanog, Dept Chem, Dunedin 9012, New Zealand
[2] Natl Inst Water & Atmosphere, Wellington, New Zealand
[3] Univ Tennessee, Dept Biosyst Engn & Soil Sci, Knoxville, TN USA
[4] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia
[5] Natl Sci Fdn, Div Ocean Sci, Arlington, VA 22230 USA
[6] Univ So Calif, Dept Biol Sci, Los Angeles, CA 90089 USA
[7] NOAA, NE Fisheries Sci Ctr, Milford, CT USA
[8] Bigelow Lab Ocean Sci, E Boothbay, ME USA
[9] Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA
基金
澳大利亚研究理事会; 美国国家科学基金会;
关键词
IRON; PHYTOPLANKTON; FERTILIZATION; POPULATIONS; LIMITATION; DEPTH; SIZE;
D O I
10.1029/2012GL053448
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Diatom blooms play a central role in supporting food-webs 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. Citation: Boyd, P. W., et al. (2012), Microbial control of diatom bloom dynamics in the open ocean, Geophys. Res. Lett., 39, L18601, doi:10.1029/2012GL053448.
引用
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页数:6
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