| Project/Area Number |
63480005
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
生態学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TEZUKA Yasuhiko Fac. Sci, Kyoto Univ. Professor, 理学部, 教授 (80087056)
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| Co-Investigator(Kenkyū-buntansha) |
NARITA Tetsuya Fac. Sci, Kyoto Univ. Assistant, 理学部, 助手 (40025440)
NAKANISHI Masami Fac. Sci, Kyoto Univ. Assistant, 理学部, 助手 (60025434)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1989: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1988: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | Lake Biwa / Phytoplankton / Primary production / Fate of product / Zooplankton feeding / Respiration / Extracellular release / Sedimentation / 動物プランクトン / 細菌 / 底泥への移行 |
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| Research Abstract |
Surveys were carried out in May, July and September of 1989 in a pelagic area (water depth, 41 m) of Lake Biwa to make clear primary production by phytoplankton and its loss processes such as extracellular release of dissolved organic carbon from phytoplankton, total plankton respiration, zooplankton feeding on phytoplankton and sedimentation of particulate organic carbon.
Daily gross primary production in the euphotic zone was 2,670 (May), 910 (July) and 1,460 (September) mg C m^<-2> d^<-1>. organic carbon lost by total plankton respiration corresponded to 46 (May), 123 (July) and 66% (September) of gross primary production. Loss by zooplankton feeding was 7-8 (May), 96-199 (July) and 21-35% (September), while loss by sedimentation was 13 (May), 40 (July) and 80% (September).
Thus, rate of primary production and proportion of primarv production lost by various loss processes were different in different seasons.
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