| Yuan Chao,Xu Zongjun,Zhang Xuelei,Wei Qinsheng,Wang Huiwu,Wang Zongling. 2019. Photosynthetic physiologies of phytoplankton in the eastern equatorial Indian Ocean during the spring inter-monsoon. Acta Oceanologica Sinica, 38(6):83－91 |
| Photosynthetic physiologies of phytoplankton in the eastern equatorial Indian Ocean during the spring inter-monsoon |
| 春季季风间期赤道东印度洋浮游植物光合生理特征 |
| Received:January 12, 2018 |
| DOI：10.1007/s13131-018-1218-0 |
| Key words:Fv/Fm rapid light curves photosynthetic physiologies eastern equatorial Indian Ocean |
| 中文关键词: Fv/Fm 快速光曲线 光合生理 赤道东印度洋 |
| 基金项目:The Global Change and Air-Sea Interaction Program under contract No. GASI-03-01-03-03; the S&T Innovation Project of the Qingdao National Laboratory for Marine Science and Technology under contract No. 2016ASKJ14; the FIO Basic Research Fund under contract No. 2013T04. |
| Author Name | Affiliation | E-mail | | Yuan Chao | College of Environment Science and Engineering, Ocean University of China, Qingdao 266061, China
Marine Ecology Research Center, MNR Key Laboratory of Science and Engineering for Marine Ecosystems, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Xu Zongjun | Marine Ecology Research Center, MNR Key Laboratory of Science and Engineering for Marine Ecosystems, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Zhang Xuelei | Marine Ecology Research Center, MNR Key Laboratory of Science and Engineering for Marine Ecosystems, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | zhangxl@fio.org.cn | | Wei Qinsheng | Marine Ecology Research Center, MNR Key Laboratory of Science and Engineering for Marine Ecosystems, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Wang Huiwu | MNR Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Wang Zongling | College of Environment Science and Engineering, Ocean University of China, Qingdao 266061, China
Marine Ecology Research Center, MNR Key Laboratory of Science and Engineering for Marine Ecosystems, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | |
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| Abstract: |
| Phytoplankton physiologies are dynamic and have sensitive responses to the ambient environment. In this paper, we examine photosynthetic physiologies of phytoplankton communities with Phyto-PAM in the eastern equatorial Indian Ocean during the spring inter-monsoon. Environmental parameters were measured to investigate the coupling between phytoplankton photosynthetic physiologies and their habitats. During the cruise, the water column was highly stratified. The mixed layer extended to about 75 m and was characterized by high temperature (>28℃) and low nutrient level. The Fv/Fm values and chlorophyll a (Chl a) concentrations were lower at the surface, as consequences of nutrient depletion and photo-inhibition. Subsurface Chl a maximum (SCM) occurred between 75 and 100 m, and had the highest Fv/Fm values. The formation of SCM was a balance between nutrient availability and light limitation. The SCM may contribute significantly to pelagic food web and primary production in the water column. Phytoplankton in different layers encountered different light, trophic and hydrographic dynamics and evolved distinct photosynthetic characteristics. Despite of co-limitation of nutrient limitation and photo-inhibition, phytoplankton in the surface layer showed their acclimation to high irradiance, had lower light utilization efficiencies (α:0.061±0.032) and could exploit a wide range of light irradiance. Whereas, phytoplankton in the SCM layers presented the highest light utilization efficiencies (α:0.146±0.48), which guaranteed higher photosynthetic capacities under low light level. These results provide insights into phytoplankton photo-adaption strategies in this less explored region. |
| 中文摘要: |
| 浮游植物的生理状态能够快速响应环境因子的变化。本文中，我们使用Phyto-PAM研究了春季季风间期赤道东印度洋浮游植物群落的光合生理特征，并结合环境因子探讨了浮游植物光合生理与生境的耦合关系。航次期间，赤道东印度洋上层水体具有显著地层化现象。混合层的深度约为75m，具有高温、低盐、低营养盐的特征。表层的Fv/Fm与叶绿素a浓度受营养盐限制和光抑制影响而较低。次表层叶绿素最大值（SCM）出现在75~100 m水深，并具有最高的Fv/Fm值。SCM的形成受光照和营养盐的双重影响，对水柱总生物量和初级生产有着显著贡献。不同水层的浮游植物表现出不同的光合生理特征。在表层，浮游植物有着较低的光能利用效率（α为0.061±0.032），但在高光强条件下仍能保持光合活性。而在SCM层，浮游植物光能利用效率达到最大（α为0.146±0.48），使该水层浮游植物在低光照条件下仍能够有较高的光合作用能力。这些结果揭示了层化水体中不同水层浮游植物的光适应策略。 |
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