Alkaline phosphatase activity and phosphatase hydrolyzable phosphorus for phytoplankton in hiroshima bay, Japan |
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| Authors: | Seok Jin Oh Yang Ho Yoon Tamiji Yamamoto Yukihiko Matsuyama |
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| Institution: | (1) Division of Bioresource and Bioenvironmental Science, Kyushu University Graduate School, 812-8581 Hakozaki, Fukuoka, Japan;(2) Division of Ocean System, College of Fisheries and Ocean Sciences, Yosu National University, 550-749 Yeosu, Korea;(3) Graduate School of Biological Sciences, Hiroshima University, Higashi-Hiroshima, 739-8528 Hiroshima, Japan;(4) Hamful Algal Bloom Division, National Research Institute of Fisheries and Environment of Inland Sea, 739-0452 Hiroshima, Hatsukaichi, Japan |
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| Abstract: | We investigated the seasonal variability of free alkaline phosphatase activity in seawater and alkaline phosphatase hydrolysable
phosphorus (APHP) at 3 stations in Hiroshima Bay using alkaline phosphatase extracted from the dinoflagellates Alexandrium
tamarense and Gymnodinium catenatum. The dissolved inorganic phosphorus (DIP) was lower than 1 μM in all samples; the lowest
values were in May. The amount of APHP was high at the surface and bottom waters of all stations in May, showing DIP-depleted
conditions. In August and November, the amount of APHP was much less than the amount of APHP in May, indicating that the availability
of dissolved organic phosphorus (DOP) for these species was low and/or uptake during the dinoflagellate blooming might have
occurred in the area. The results obtained from short-term variations of AP activity might suggest that the growth of dinoflagellates
in this season may be partly supported by the AP produced by other diatoms. |
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| Keywords: | Alkaline phosphatase Alexandrium tamarense Gymnodinium catenatum DIP DOP APHP |
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