Spatio-temporal phytoplankton variability and nutrient addition bioassays as indicators of nutrient limitation of phytoplankton growth in Gwangyang Bay, Korea
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Title
- Spatio-temporal phytoplankton variability and nutrient addition bioassays as indicators of nutrient limitation of phytoplankton growth in Gwangyang Bay, Korea
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Author(s)
- 백승호; 김동선; 신경순; 손문호; 김영옥
- KIOST Author(s)
- Baek, Seung Ho(백승호); Kim, Dong Seon(김동선); Shin, Kyoung Soon(신경순); Kim, Young Ok(김영옥)
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Alternative Author(s)
- 백승호; 김동선; 신경순; 손문호; 김영옥
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Publication Year
- 2014-10-02
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Abstract
- To assess the effect of nutrient limitation on phytoplankton growth, and its influence on seasonal variation in phytoplankton community structure, we investigated abiotic and biotic factors in surface and bottom waters at 20 stations in inner and offshore areas of Gwangyang Bay, Korea. Algal bioassay experiments were also conducted using surface water, to assess the effects of nutrient addition on the phytoplankton assemblages. The fate of major nutrients in the bay was strongly dependent on the discharge of freshwater from the Seomjin River. River flow during the rainy season provides a high nitrogen (N) influx, pushing the system toward stoichiometric phosphorus (P) limitation. However, at some times during the rainy season there was insufficient N to maintain phytoplankton growth because it was rapidly consumed through nutrient uptake by phytoplankton under stratified environmental conditions. Diatoms made a relatively large contribution to total phytoplankton biomass. The dominant diatom, particularly in winter and summer, was a Skeletonema costatum while Eucampia zodiacus and the cryptophyte Cryptomonas spp. dominated in spring and autumn, respectively, comprising more than 75% of the community at most stations. In the bioassay experiments the phytoplankton biomass increased by 30– 600% in the +N (added nitrogen) and +NP (added nitrogen and phosphorus) treatments relative to the control and the +P (added pher and offshore areas of Gwangyang Bay, Korea. Algal bioassay experiments were also conducted using surface water, to assess the effects of nutrient addition on the phytoplankton assemblages. The fate of major nutrients in the bay was strongly dependent on the discharge of freshwater from the Seomjin River. River flow during the rainy season provides a high nitrogen (N) influx, pushing the system toward stoichiometric phosphorus (P) limitation. However, at some times during the rainy season there was insufficient N to maintain phytoplankton growth because it was rapidly consumed through nutrient uptake by phytoplankton under stratified environmental conditions. Diatoms made a relatively large contribution to total phytoplankton biomass. The dominant diatom, particularly in winter and summer, was a Skeletonema costatum while Eucampia zodiacus and the cryptophyte Cryptomonas spp. dominated in spring and autumn, respectively, comprising more than 75% of the community at most stations. In the bioassay experiments the phytoplankton biomass increased by 30– 600% in the +N (added nitrogen) and +NP (added nitrogen and phosphorus) treatments relative to the control and the +P (added ph
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/25987
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Bibliographic Citation
- The 2nd Asian Marine Biology Symposium, pp.232, 2014
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Publisher
- 아시아 해양생물 심포지움
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Type
- Conference
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Language
- English
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