| Competition within the marine microalgae over the polar dark period in the Greenland Sea of high Arctic |
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| 作者姓名： | Zhang Qing Rolf Gradinger Zhou Qingsong |
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| 作者单位： | Institute of |
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| 基金项目： | This project was supported by the National Natural Science Foundation of China under contract No. 49906006. |
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| 摘 要： | Abstract-With the onset of winter, polar marine microalgae would have faced total darkness for aperiod of up to 6 months. A natural autumn community of Arctic sea ice microalgae was collected fordark survival experiments from the Greenland Sea during the ARKTIS-XI/2 Expedition of RV Po-larstern in October 1995. After a dark period of 161 days, species dominance in the algal assemblagehave changed from initially pennate diatoms to small phytoflagellates (<20μm). Over the entire darkperiod, the mean algal growth rate was-0.01 d~(-1). Nearly all diatom species had negative growthrates, while phytoflagellate abundance increased. Resting spore formation during the dark period was ob-served in less than 4.5% of all cells and only for dinoflagellates and the diatom Chaetoceros spp. We as-sume that facultative heterotrophy and energy storage are the main processes enabling survival during thedark Arctic winter. After an increase in light intensity, microalgal cells reacted with fast growth withindays. Phytoffa
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| 关 键 词： | Competition marine microalgae dark the Greenland Sea Arctic |
| 收稿时间： | 2002/11/18 0:00:00 |
| 修稿时间： | 2002/12/12 0:00:00 |
Competition within the marine microalgae over the polar dark period in the Greenland Sea of high Arctic |
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| Zhang Qing,Rolf Gradinger,Zhou Qingsong.Competition within the marine microalgae over the polar dark period in the Greenland Sea of high Arctic[J].Acta Oceanologica Sinica,2003,22(2):233-242. |
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| Authors: | Zhang Qing Rolf Gradinger and Zhou Qingsong |
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| Institution: | 1.Laboratory of Ocean Dynamic Processes and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China2.Institute of Marine Science, University of Alaska, Fairbanks, AK 99775-7220, USA |
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| Abstract: | With the onset of winter, polar marine microalgae would have faced total darkness for a period of up to 6 months. A natural autumn community of Arctic sea ice microalgae was collected for dark survival experiments from the Greenland Sea during the ARKTIS-XI/2 Expedition of RV Polarstern in October 1995. After a dark period of 161 days, species dominance in the algal assemblage have changed from initially pennate diatoms to small phytoflagellates ( ＜ 20 μm). Over the entire dark period, the mean algal growth rate was - 0.01 d-1. Nearly all diatom species had negative growth rates, while phytoflagellate abundance increased. Resting spore formation during the dark period was observed in less than 4.5% of all cells and only for dinoflagellates and the diatom Chaetoceros spp. We assume that facultative heterotrophy and energy storage are the main processes enabling survival during the dark Arctic winter. After an increase in light intensity, microalgal cells reacted with fast growth within days. Phytoflagellates had the highest growth rate, followed by Nitzschia frigida. Further investigations and experiments should focus on the mechanisms of dark survival (mixotrophy and energy storage) of polar marine microalgae. |
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| Keywords: | Competition marine microalgae dark the Greenland Sea Arctic |
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