| Budget Amount *help |
¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
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| Outline of Final Research Achievements |
The quantitative importance and trophic role of heterotrophic dinoflagellates during spring diatom bloom was studies at a coastal site in Sanriku, Japan. Hetrotrophic dinoflagellates including both thecate and athecate gymnodinoid species often occurred at high abundance composing from 42 to 81% (average 67%) of total microzooplankton biomass and diatom feeders (the species which able to feed on diatom) were dominated heterotrophic dinoflagellate assemblages accounting for 11 to 77%. Daily losses of phytoplankton (mainly diatom) by hetrotrophic dinoflagellate grazing based on in situ experiments were mostly around 5 to 15% of the initial standing stock, or between 10 and 45% of the potential primary production. These estimations partially explained the decrease of diatom standing crops during late bloom stage. This indicates that dinoflagellate herbivory on diatom was highly active and substantial energy was transferred from diatom during bloom.
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