Response of lower trophic organisms to nutrient input and effects on carbon budget : a mesocosm experiment
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概要
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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.
- 2010-11-01
著者
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Tsuda A
Univ. Tokyo Tokyo Jpn
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SUZUKI KOJI
Faculty of Environmental Earth Science, Hokkaido University
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KIYOSAWA HIROSHI
Marine Biological Research Institute of Japan
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WONG CHI
Institute of Ocean Science
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KASAI Hiromi
Hokkaido National Fisheries Research Institute
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SHIMIZU Takao
Nagasaki Marine Observatory
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Nishioka Jun
Institute Of Low Temperature Science Hokkaido University
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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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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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Kiyosawa Hiroshi
Marine Biological Research Institute
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Tsuda Atsushi
Atmosphere And Ocean Research Institute University Of Tokyo
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Johnson Keith
Centre For Ocean Climate Chemistry Institute Of Ocean Science
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Fukami Kimio
Laques Kochi University
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Takahashi Masayuki
Institute Of Systems Science Graduate School Of Arts And Sciences University Of Tokyo
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Suzuki Koji
Faculty Of Environmental Earth Science Hokkaido University
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