| ZHANG Yuyu,LU Songhui,ZHANG Chuansong,GAO Yahui. 2010. Distribution and germination of viable diatom resting stage cells in sediments of the East China Sea. Acta Oceanologica Sinica, 29(5):121－128 |
| Distribution and germination of viable diatom resting stage cells in sediments of the East China Sea |
| Distribution and germination of viable diatom resting stage cells in sediments of the East China Sea |
| Received:July 15, 2009 Revised:December 14, 2009 |
| DOI：10.1007/s13131-010-0070-7 |
| Key words:diatom germination MPN resting stages seed bank sediment |
| 中文关键词: diatom germination MPN resting stages seed bank sediment |
| 基金项目:The Joint Funds of the National Natural Science Foundation of China-Guangdong Province under contract No. U0733006973; the National Basic Research Priorities Programme under contract No. 2001CB409704. |
| Author Name | Affiliation | E-mail | | ZHANG Yuyu | Key Laboratory of Ministry of Education for Coast and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China | | | LU Songhui | Research Center for Harmful Algae and Aquatic Environment, Jinan University, Guangzhou 510632, China
College of Life Science, South China Normal University, Guangzhou 510631, China | lusonghui1963@163.com | | ZHANG Chuansong | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China | | | GAO Yahui | Key Laboratory of Ministry of Education for Coast and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China | |
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| Abstract: |
| The abundance and temporal patterns of viable diatom resting stage cells in sediments of the East China Sea in 2006 have been investigated. The abundance of viable resting stages was enumerated with the most probable number (MPN) technique. Overall, 25 diatom species (including varieties) belonging to 16 genera were detected. Viable resting stage cells were common, on the order of 103 to 106 cells/g dry mass. The abundant taxa included Skeletonema marina, S. dohrnii, Chaetoceros curvisetus and Thalassiosira spp., with Skeletonema accounting for 83.3% of the cell. The effects of temperature (10, 15, 20, 25℃), salinity (20, 25, 30, 35 psu) and light intensity (0, 300, 4 000, 8 000 lux) on the germination of resting stages in sediment samples were also determined. The results showed that light intensity had a significant positive effect on the germination of diatom resting stage cells (p <0.01) and that diatoms could not germinate in darkness. Temperature and salinity had no noticeable effects on the germination. The present study suggests that there are abundant diatom resting cells in sediments of the East China Sea, which could serve as a "seed bank" in the phytoplankton population succession and contribute to the initiation of algal blooms. |
| 中文摘要: |
| The abundance and temporal patterns of viable diatom resting stage cells in sediments of the East China Sea in 2006 have been investigated. The abundance of viable resting stages was enumerated with the most probable number (MPN) technique. Overall, 25 diatom species (including varieties) belonging to 16 genera were detected. Viable resting stage cells were common, on the order of 103 to 106 cells/g dry mass. The abundant taxa included Skeletonema marina, S. dohrnii, Chaetoceros curvisetus and Thalassiosira spp., with Skeletonema accounting for 83.3% of the cell. The effects of temperature (10, 15, 20, 25℃), salinity (20, 25, 30, 35 psu) and light intensity (0, 300, 4 000, 8 000 lux) on the germination of resting stages in sediment samples were also determined. The results showed that light intensity had a significant positive effect on the germination of diatom resting stage cells (p <0.01) and that diatoms could not germinate in darkness. Temperature and salinity had no noticeable effects on the germination. The present study suggests that there are abundant diatom resting cells in sediments of the East China Sea, which could serve as a "seed bank" in the phytoplankton population succession and contribute to the initiation of algal blooms. |
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