Seasonal fluctuations of cell density of cyanobacteria and other picophytoplankton in Iwanai Bay,Hokkaido, Japan |
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| Authors: | Akira Miyazono Tsuneo Odate Yoshiaki Maita |
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| Institution: | (1) Hokkaido Nuclear Energy Environmental Research Center, 045-01 Miyaoka, Kyowa, Japan;(2) Division of Marine Biochemical Science, Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University, 3-1-1, Minato-cho, 041 Hakodate, Japan;(3) Division of Marine Biochemical Science, Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University, 3-1-1, Minato-cho, 041 Hakodate, Japan;(4) Present address: Hokkaido Abashiri Fishery Experimental Station, 31 Masuura, 099-31 Abashiri, Japan;(5) Present address: Biological Oceanography, Faculty of Bioresources, Mie University, 1515 Kamihama-cho, 514 Tsu, Japan |
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| Abstract: | In Iwanai Bay, which is located on the Japan Sea coast in Hokkaido, seasonal fluctuations in cell densities of phycoerythrin-dominant cyanobacteria and chlorophyll-dominant, other picophytoplankton were examined. Cell densities of cyanobacteria and other picophytoplankton ranged from 1.4×105 to 1.9×108 and from 4.0×104 to 4.3×106 cells 1–1, respectively. The cell densities of both groups tended to increase after spring diatom bloom with remarkable fluctuations from June to August. This tendency was caused by the vertical distributions of both groups. The maximum density layer shifted from 0–20 m depth in April–June to 20–50 m depth in August–October. Cyanobacteria were dominant in picophytoplankton community which accounted for 73–99% of the total cell density during the whole year. Present results show that the picophytoplankton community in Iwanai Bay was influenced by a single water mass system (Tsushima Warm Current) during the whole year.This is contribution No. 254 from the Research Institute of North Pacific Fisheries, Faculty of Fisheries, Hokkaido University. |
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