Response of lower trophic organisms to nutrient input and effects on carbon budget: a mesocosm experiment
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- Tsuda Atsushi
- Atmosphere and Ocean Research Institute, University of Tokyo
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- Fukami Kimio
- LAQUES, Kochi University
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- Kiyosawa Hiroshi
- Marine Biological Research Institute
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- Suzuki Koji
- Faculty of Environmental Earth Science, Hokkaido University
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- Takeda Shigenobu
- Central Research Institute of Electric Power Industry
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- Nishioka Jun
- Central Research Institute of Electric Power Industry
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- Takahashi Masayuki
- Institute of Systems Science, Graduate School of Arts and Sciences, University of Tokyo
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- Johnson Keith
- Centre for Ocean Climate Chemistry, Institute of Ocean Science
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- Wong Chi-Shing
- Centre for Ocean Climate Chemistry, Institute of Ocean Science
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The roles of heterotrophic organisms (microzooplankton, mesozooplankton, bacteria and heterotrophic nanoflagellates) were examined during a nutrient enrichment experiment using a mesocosm in Saanich Inlet, British Columbia, Canada. Grazing rates of microzooplankton, copepods, and Noctiluca scintillans were respectively estimated by the dilution method, from the egg production, and the apparent growth rate. The primary production increased by about 11 times during the initial 3 days, and the grazing rate by zooplankton also increased by 7.4 times. The primary production exceeded the grazing rate during the initial 5 days, after that, almost balanced rates were observed. Biomass peaks of bacteria and HNFs (heterotrophic nanoflagellates) were observed after the decline of the phytoplankton bloom. Bacterial production and HNF bacterivory gradually increased from the beginning to the end of the experiment. Microzooplankton consistently removed about half of the primary production. The contribution of microzooplankton to grazing was largest during the initial 7 days. Heterotrophic dinoflagellates were the most dominant component of the microzooplankton, but oligotrich ciliates showed the fastest growth response to phytoplankton production. Noctiluca scintillans became an important grazer after the bloom. Overall, the contribution of microzooplankton grazing was the largest of the processes through which phytoplankton were lost. Cell sinking was a minor component contributing to loss of phytoplankton. Thus, oligotrich ciliates and heterotrophic dinoflagellates were the most plausible organisms contributing to the steady state of phytoplankton concentrations.
収録刊行物
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- Plankton and Benthos Research
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Plankton and Benthos Research 5 (4), 144-155, 2010
日本プランクトン学会、日本ベントス学会
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詳細情報 詳細情報について
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- CRID
- 1390001205265472896
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- NII論文ID
- 10027122064
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- NII書誌ID
- AA12130745
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- ISSN
- 1882627X
- 18808247
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- NDL書誌ID
- 10899796
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可