| Zhang Qing,Rolf Gradinger,Zhou Qingsong. 2003. Competition within the marine microalgae over the polar dark period in the Greenland Sea of high Arctic. Acta Oceanologica Sinica, (2):233－242 |
| Competition within the marine microalgae over the polar dark period in the Greenland Sea of high Arctic |
| Competition within the marine microalgae over the polar dark period in the Greenland Sea of high Arctic |
| Received:November 18, 2002 Revised:December 12, 2002 |
| DOI： |
| Key words:Competition marine microalgae dark the Greenland Sea Arctic |
| 中文关键词: Competition marine microalgae dark the Greenland Sea Arctic |
| 基金项目:This project was supported by the National Natural Science Foundation of China under contract No. 49906006. |
| Author Name | Affiliation | | Zhang Qing | Laboratory of Ocean Dynamic Processes and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | Rolf Gradinger | Institute of Marine Science, University of Alaska, Fairbanks, AK 99775-7220, USA | | Zhou Qingsong | Laboratory of Ocean Dynamic Processes and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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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. |
| 中文摘要: |
| 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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