Seasonal Variations in Abundance, Biomass, <I>in situ</I> Growth Rate and Production of Tintinnid Ciliates in Kure Port, the Inland Sea of Japan

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  • 瀬戸内海呉港における有鐘繊毛虫類の出現密度, 現存量, 増殖速度, および生産速度の季節的変動
  • Seasonal Variations in Abundance, Biomass, in situ Growth Rate and Production of Tintinnid Ciliates in Kure Port, the Inland Sea of Japan

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Abstract

Seasonal variations in species composition, abundance, biomass, specific growth rate and production rate of tintinnid ciliates were investigated in Kure Port, the Inland Sea of Japan. Twenty species representing 8 genera occurred on a pronounced seasonal basis. Tintinnid abundance varied from 0 to 620 cells L-1 with an annual mean of 150 cells L-1, which appeared to be much lower than those commonly encountered in coastal waters where chlorophyll-a levels were similar to those in Kure Port. The natural tintinnid populations were incubated under predator-free in situ conditions on each sampling occasion, and specific growth rates were determined for 18 species. The growth rates ranged from 0.10 to 1.18d-1, which is about half of the near-potential growth rates predicted from empirically derived multiple regressions based on temperature and cell size. These in situ growth rates were used to estimate the production rate of the tintinnid community, which varied from 0 to 5.2μg CL-1d-1. The calculated daily grazing impact of tintinnids on nanophytoplankton biomass was as low as 0 to 8.8%. The low abundance and growth rate of tintinnids in Kure Port might be responsible to the occurrence of phytoplankton species with poor food quality.

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