Interactive effects of iron, irradiance and CO2 on Ross Sea phytoplankton

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Author(s) Feng, Y., Hare, C.E., Rose J.M., Handy, S.M., DiTullio, G.R., Lee, P.A., Smith, W.O., Peloquin, J., Tozzi, S., Sun, J., Zhang, Y., Dunbar, R.B., Long, M.C., Sohst, B., Lohan, M., Hutchins, D.A.
Publication Type Journal Items, Publication Status: Published
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Title Interactive effects of iron, irradiance and CO2 on Ross Sea phytoplankton
Author(s) Feng, Y.
Hare, C.E.
Rose J.M.
Handy, S.M.
DiTullio, G.R.
Lee, P.A.
Smith, W.O.
Peloquin, J.
Tozzi, S.
Sun, J.
Zhang, Y.
Dunbar, R.B.
Long, M.C.
Sohst, B.
Lohan, M.
Hutchins, D.A.
Journal or Series Title Deep-sea research. Part 1, Oceanographic research papers
Volume Number 57
Issue Number 3
Start Page 368
End Page 383
ISSN 0967-0637
Publisher Elsevier
Publication Place Kidlington
Publication Date 2010-03
Keyword(s) CO2
Iron limitation
Ross Sea
Global change
Interactive effects
Southern Ocean
Abstract We conducted a factorial shipboard continuous culture experiment to examine the interactive effects of altered iron, irradiance and CO2 on the summer phytoplankton community of the Ross Sea, Antarctica. After 18 days of continuous incubation, iron enrichment increased phytoplankton biomass, nutrient drawdown, diatom and Phaeocystis abundance, and some photosynthetic parameters. High irradiance significantly increased the number of Phaeocystis antarctica colonies, as well as P. antarctica abundance relative to diatoms. Iron and light had significant interactive effects on diatom and P. antarctica pigment concentrations, P. antarctica colony abundance, and Si:N, Si:C, and N:P ratios. The major influence of high CO2 was on diatom community structure, by favoring the large centric diatom Chaetoceros lineola over the small pennate species Cylindrotheca closterium. The ratio of centric to pennate diatoms was significantly responsive to changes in all three variables individually, and to all of their possible two- and three-way combinations. These results suggest that shifts in light, iron, and CO2 and their mutual interactions all play a role in controlling present day Ross Sea plankton community structure, and need to be considered when predicting the possible future responses of biology and biogeochemistry in this region.
DOI 10.1016/j.dsr.2009.10.013
Additional Notes Received 15 May 2009, Revised 23 October 2009, Accepted 18 November 2009, Available online 26 November 2009
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 000944022
Source Database ID FORM-1296203899
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  author = "Feng, Y. and Hare, C.E. and Rose J.M. and Handy, S.M. and DiTullio, G.R. and Lee, P.A. and Smith, W.O. and Peloquin, J. and Tozzi, S. and Sun, J. and Zhang, Y. and Dunbar, R.B. and Long, M.C. and Sohst, B. and Lohan, M. and Hutchins, D.A.",
  title = "{I}nteractive effects of iron, irradiance and {C}{O}2 on {R}oss {S}ea phytoplankton",
  journal = "Deep-sea research. Part 1, Oceanographic research papers",
  year = 2010,
  volume = "57",
  number = "3",
  pages = "368--383",
  month = mar,

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