Effect of dissolved organic matter on the growth of algae, Pseudokirchneriella subcapitata, in Korean lakes: The importance of complexation reactions

Jiho Lee, Ji Hyung Park, Yong Sik Shin, Byung Cheun Lee, Nam Ik Chang, Jaeweon Cho, Sang Don Kim

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The objective of this study was to investigate the effect of dissolved organic ligands, such as EDTA, humic acids, hydrophobic and hydrophilic fractions of dissolved organic matter (DOM), on the growth of Pseudokirchneriella subcapitata in cultured media and natural lake waters. The growth of algae was gradually increased on the addition of dissolved organic ligands, but markedly declined at high concentrations, due to reduced bioavailable iron concentrations (e.g., Fe3+ and Fe′-inorganic ferric iron). The results demonstrated that the high growth rates of P. subcapitata were correlated with the hydrophobic, but not hydrophilic, DOM from five lakes, spiked under the nutrients-controlled conditions. This was attributed to the role of DOM in controlling the bioavailable iron due to complexation of Fe(III) with -COOH and -OH functional groups on the hydrophobic DOM. Therefore, the hydrophobic DOM, as chelating agent, is a biologically important component in the lake waters, which affects the algal growth by interacting with bioavailable iron in the lake water and can change the results of bioassay experiments.

Original languageEnglish
Pages (from-to)335-343
Number of pages9
JournalEcotoxicology and Environmental Safety
Volume72
Issue number2
DOIs
StatePublished - Feb 2009

Keywords

  • Bioavailability
  • Dissolved organic matter (DOM)
  • Iron
  • Pseudokirchneriella subcapitata

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