High tolerance of phytoplankton for extremely high ammonium concentrations in the eutrophic coastal water of Dokai Bay (Japan)

Suksomjit, Marut; Tada, Kuninao; Ichimi, Kazuhiko et al.

うみ, 2009, 47(3), 75-88

Permalink : https://hdl.handle.net/2115/56667

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アクセス権
open access
URI
https://hdl.handle.net/2115/56667
タイトル
High tolerance of phytoplankton for extremely high ammonium concentrations in the eutrophic coastal water of Dokai Bay (Japan)
著者
Suksomjit, Marut ; Tada, Kuninao ; Ichimi, Kazuhiko ; Montani, Shigeru
著者名
Suksomjit, Marut
e-Rad_Researcher
80207042
著者名
Tada, Kuninao
著者名
Ichimi, Kazuhiko
e-Rad_Researcher
30136288
著者名
Montani, Shigeru
言語
英語
キーワード
Ammonium toxicity
growth inhibition
Dokai Bay
発行日
2009-11-28
出版者
日仏海洋学会
収録物名
うみ
巻(号)
47(3)
ページ
75-88
抄録
The tolerance of phytoplankton in Dokai Bay for an extremely high ammonium concentration in culture media has been studied. Six species of phytoplankton, three diatoms (two clones of Skeletonema sp. and Chaetoceros sp.) and three flagellates (Heterosigma akashiwo, Chattonella antiqua and Karenia mikimotoi) were grown in various concentrations of NH4Cl. The results suggested that high ammonium concentrations had negative effects on phytoplankton growth. Non-indigenous species in Dokai Bay, Japan, C. antiqua and K. mikimotoi, were unable to grow at 200 and 150 μ M, respectively. Growth rates of Skeletonema sp. isolated from Harima Nada (Seto Inland Sea, Japan), Chaetoceros sp. and H. akashiwo were reduced significantly at higher ammonium concentrations compared to the control treatment. However, such a high ammonium concentration of even 1,500 μ M could not produce a significant adverse effect on the growth rate of Skeletonema sp. isolated from Dokai Bay. Furthermore, the maximum chlorophyll fluorescence of tested species was also gradually decreased with an increase in ammonium concentration. The influence of a high ammonium level on phytoplankton growth observed in this study confirmed the phytoplankton species composition observed in Dokai Bay. Our results suggested that such a high ammonium concentration was an important factor in determining the species composition of the phytoplankton assemblage in that bay.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
PISSN
0503-1540
NCID
AN00019968