Diatoms grow faster using ammonium in rapidly flushed eutrophic Dokai Bay,Japan |
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| Authors: | Kuninao Tada Marut Suksomjit Kazuhiko Ichimi Yui Funaki Shigeru Montani Machiko Yamada Paul J Harrison |
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| Institution: | (1) Aqua Research Center, University of Kitakyushu, Hibikino 1-1, Wakamatsu-ku, Kitakyushu 808-0135, Japan;(2) Faculty of Human Environment Science, Fukuoka Women’s University, Kasumigaoka 1-1-1, Higashi-ku, Fukuoka 813-8529, Japan;(3) Faculty of Agriculture, Kagawa University, Ikenobe, Mikicho, Kita-gun, Kagawa 761-0130, Japan;(4) Graduate School of Environmental Science, Hokkaido University, Kita 10, Nishi 5, Kita-ku, Sapporo 060-0810, Japan;(5) Present address: Fisheries Section, Agriculture, Forestry and Fisheries Department, City of Kitakyushu, Jyounai 1-1, Kokurakita-ku, Kitakyushu 803-8501, Japan |
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| Abstract: | The importance of the nitrogen source for phytoplankton growth in a highly eutrophic embayment, Dokai Bay, was investigated.
The DIN concentration often exceeded 100 μM of which 40–70% was NH4
+. During two incubation experiments, the natural assemblage of mainly diatoms took up NH4
+ instead of NO3
−. The growth of two Skeletonema species isolated in Dokai Bay were significantly faster on NH4
+ (1.86 and 1.27 div. d−1 respectively) than on NO3
− (1.55 and 1.04 div. d−1 respectively). Our results indicated that these diatoms could grow faster by using NH4
+ compared to NO3
− in this eutrophic bay. |
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