Journal
JOURNAL OF OCEANOGRAPHY
Volume 67, Issue 2, Pages 183-196Publisher
SPRINGER
DOI: 10.1007/s10872-011-0017-4
Keywords
Fe storage; Intracellular Fe; Luxury Fe uptake; Centric diatoms; Survival strategy
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Funding
- Japan Science Society
- Research Institute for Humanity and Nature
- Ministry of Education, Culture, Sports, Science and Technology [18201001]
- Steel Industry Foundation for the Advancement of Environmental Protection Technology
- Grants-in-Aid for Scientific Research [18201001, 22510001, 22310002] Funding Source: KAKEN
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We report on the ability for luxury Fe uptake and the potential for growth utilizing intracellular Fe pools for 4 coastal centric diatom isolates and in situ phytoplankton assemblages, mainly composed of diatoms. Iron uptake of the diatom isolates and natural phytoplankton assemblages in the Oyashio region during spring blooms were prevented by adding hydroxamate siderophore desferrioxamine B (DFB). After the addition of DFB, intracellular Fe in the diatom isolates supported 2.4-4.2 cell divisions with 1.2-2.6 Chl a doublings. The intracellular Fe was primarily used for cell generation rather than Chl a production, leading to a reduction in the Chl a cell quota in the Fe-starved cells with time. The metabolic properties of the Fe-starved cells with their cell morphologies were different among species or genera. An on-deck incubation experiment also exhibited 1.9 cell divisions and 0.81 Chl a doublings of phytoplankton after the addition of DFB, also indicating the preference of cell generation over Chl a production. A decrease in the level of cellular Chl a, a main light-harvesting pigment in Fe-starved diatoms, may become a superior survival strategy to protect the cells from high irradiance that can cause photo-oxidative damages through photosynthesis. Such relatively low-Fe with high-light conditions could often occur in surface waters of the Oyashio region from spring to summer.
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