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Marine Biology

, Volume 149, Issue 2, pp 379–392 | Cite as

Effect of aging time on the availability of freshly precipitated ferric hydroxide to coastal marine diatoms

  • Masahiko Yoshida
  • Kenshi Kuma
  • Shouei Iwade
  • Yutaka Isoda
  • Hyoe Takata
  • Masumi Yamada
Research Article

Abstract

Cell growth and iron uptake of the coastal marine diatoms Chaetoceros sociale and Thalassiosira weissflogii were studied in the presence of short-aged amorphous ferric hydroxide (am-Fe(III)) media. These were prepared by aging for 1 day, 3 days, and 3 weeks after adding a small amount of ferric iron acidic stock solution to autoclaved filtered seawater and were experimentally measured in culture experiments at 10°C for C. sociale and 20°C for T. weissflogii. The order of cell yields for both species was: 1-day aged am-Fe(III) >3-day aged am-Fe(III) >> 3-week aged am-Fe(III) media. The iron uptake rates by C. sociale during 0–1 day in 1 day and 3-day aged am-Fe(III) media were about two-thirds and one-fourths, respectively, lower than that in the direct Fe(III) input medium containing C. sociale into which an acidic Fe(III) stock solution was added directly. The longer aging time of am-Fe(III) in media results in reducing the supply of bioavailable iron in the media by the slower dissolution rate of am-Fe(III) with the longer aging time. These results suggest that the chemical and structural changes of freshly precipitated amorphous ferric hydroxide with short aging time affect their ability, such as iron solubility and dissolution rate to supply bioavailable iron for the phytoplankton growth. The chemical and structural conversion of solid iron phases with time is one of the most important processes in changing the supply of available iron to marine phytoplankton in estuarine and coastal waters and in iron fertilization experiments.

Keywords

Phytoplankton Iron Uptake Initial Growth Rate Longe Aging Time Short Aging Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We thank Dr. K. Suzuki (ES, Hokkaido University) for supplying coastal diatom species and for helpful comments. We also are grateful to anonymous reviewers for their constructive and helpful comments on this work. Partial support was provided by Grant-in-Aids for Environmental Research (No. 023039) from the Sumitomo Foundation and Scientific Research (No. 17651001) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Masahiko Yoshida
    • 1
  • Kenshi Kuma
    • 1
    • 2
  • Shouei Iwade
    • 1
  • Yutaka Isoda
    • 1
  • Hyoe Takata
    • 1
  • Masumi Yamada
    • 2
  1. 1.Graduate School of Fisheries SciencesHokkaido UniversityHokkaidoJapan
  2. 2.Graduate School of Environmental ScienceHokkaido UniversityHokkaidoJapan

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