Temporal change of clustered distribution of planktonic ciliates in Toyama Bay in summers of 1989 and 1990 |
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| Authors: | Toshikazu Suzuki Akira Taniguchi |
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| Institution: | (1) Tohoku University, 981 Sendai, Japan;(2) Present address: Nagasaki University, Bunkyo-Cho 1-14, 852 Nagasaki, Japan |
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| Abstract: | Temporal change of clustered distribution in vertical profiles of three nutritional groups of planktonic ciliates, e.g. heterotrophic
naked ciliates, mixotrophic naked ciliates and heterotrophic loricated ciliates, was investigated by following a drifting
buoy in Toyama Bay on the Japan Sea coast of central Japan in summers of 1989 and 1990. Clustered distribution, represented
as the mode of population density in the vertical plane, occurred mainly in the oligotrophic upper layer (0–50 m depth) above
the subsurface chlorophyll-a maximum layer. Its clustered degree was stronger when the mode of population density in the vertical plane was formed at
shallower depth, while its longevity was shorter as mentioned above. Vertical distribution of ciliates during summer in Toyama
Bay is characterized by ephemeral clustered distribution, or in other wards, by rapid alternations of appearance and disappearance
of the clustered distribution. |
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| Keywords: | Planktonic ciliates vertical profile clustered distribution temporal change Toyama Bay |
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