Seasonal Change in Photosynthetic Activity of Photoautotrophic Picoplankton in Lake Biwa.
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Seasonal changes in the photosynthetic activity of pico phytoplankton and its contribution to total primary productivity in surface waters at eleven pelagic stations in the north and south basin were examined. Chlorophyll-α concentration of the pico phytoplankton was 0.3 to 5.7 mg chl.a m<SUP>-3</SUP>, and was two times higher in the south basin than in the north basin. High standing crops were observed from late July through August. The photosynthetic rate of the pico phytoplankton was 0.9 to 36 mg C m<SUP>-3</SUP> hr<SUP>-1</SUP> and changed seasonally according to a pattern. High values were obtained in the south basin and throughout the lake during summer. The seasonal changing pattern in photosynthetic rates of the larger phytoplankton showed quite a difference from that of the pico phytoplankton. The assimilation number of the pico phytoplankton was 1.8 to 7.3 mg C mg chl.α<SUP>-1</SUP> hr<SUP>-1</SUP> and changed seasonally with high values in summer. The percentage of the standing crop of the pico phytoplankton in the total phytoplankton was generally low, but an appreciable increase was observed from late July to early October. However, the contribution of the pico phytoplankton to primary productivity was lower. In summer, when a high standing crop and high assimilation number of pico phytoplankton were observed, however, the pico phytoplankton made a major contribution to the total primary productivity. The present results suggest that the photoautotrophic picoplankton, Synechococcus, is one of the principal primary producers and plays a significant role in the biogeochemical carbon cycle in the pelagic area of Lake Biwa.
- 日本陸水学会の論文
日本陸水学会 | 論文
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