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| 黄茅海浮游生物及其粒径结构的潮汐变化特征研究 |
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刘子嘉1,2, 李芊1,2,3, 陈寅超1,2, 帅义萍1,2, 马梦真1,2
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1.热带海洋环境国家重点实验室 中国科学院南海海洋研究所 广州 510301;2.中国科学院大学 北京 100049;3.南方海洋科学与工程广东省实验室(广州) 广州 511458
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| 摘要: |
| 河口区浮游生物作为食物链的重要组成部分，在海洋生物地球化学循环中起到重要作用。为了解黄茅海河口浮游生物及其粒径结构的时空分布特征，于2017年8月17日至21日对黄茅海河口区域微微型浮游生物（pico-，<2 μm），微型浮游生物（nano-，2-20 μm）及小型浮游生物（micro-，20-200 μm）及其粒径结构进行观测。结果显示，河口外侧总叶绿素a浓度最高，为19.34μg/L，且大粒径浮游生物占比最高。底层水体受上溯海水影响较为明显，表现出盐度及营养盐浓度随潮汐呈现显著的周期性变化。潮汐过程对不同粒径的浮游生物影响不同，对微微型浮游生物影响较小，对大粒径浮游生物影响较大。涨潮时，表层标准化浮游生物粒径谱（NBSS）斜率增大，大粒径浮游生物占比增多。落潮时，NBSS斜率减小，小粒径浮游生物占比增多。潮汐过程及由其引起的营养盐、温度和可利用光强的改变是影响黄茅海河口浮游生物分布的主要因素。研究可为河口区浮游生态系统以及海洋生物地球化学循环过程等的研究提供重要依据。 |
| 关键词: 浮游生物 浮游生物粒径 潮汐 黄茅海 |
| DOI：10.11693/hyhz20210400107 |
| 分类号:Q178 |
| 基金项目:广东省特支计划领军人才项目,2019TX05H216号;南方海洋科学与工程广东省实验室(广州)重大专项,GML2019ZD0305号。 |
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| TIDAL EFFECTS ON PLANKTON COMMUNITY AND SIZE-STRUCTURE IN THE HUANGMAO BAY OF THE SOUTH CHINA SEA |
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LIU Zi-Jia1,2, LI Qian1,2,3, CHEN Yin-Chao1,2, SHUAI Yi-Ping1,2, MA Meng-Zhen1,2
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1.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Guangdong Laboratory of Southern Ocean Science and Engineering(Guangzhou), Guangzhou 511458, China
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| Abstract: |
| As a key component of the aquatic food chain, plankton plays an important role in the marine biogeochemical cycle. To explore the temporal and spatial patterns of the plankton community, a field survey was carried out in the Huangmao Bay of the South China Sea (SCS) from August 17th to 20th, 2017. We estimated the plankton size structure based on the normalized biovolume size spectrum (NBSS) by FlowCAM and the composition of the picoplankton community by flow cytometry. Our results suggest that the highest concentration of total chlorophyll-a was located outside the bay where large-sized plankton was relatively dominant. The onshore intrusion of seawater had a great impact on the bottom layer, leading to periodical salinity and temperature fluctuations during each tidal cycle. The tidal variation showed distinct effects on the plankton of different sizes. Picoplankton was merely affected by tidal forcing, but large-sized plankton was greatly influenced. In addition, a substantial increase in the NBSS slope (a higher fraction of large-sized plankton) was observed during high tides, while the NBSS slope decreased substantially (a higher fraction of small-sized plankton) during low tides. Therefore, the tidal forcing along with the changes in nutrients, temperature, and light were the main drivers affecting the distribution of plankton in the Huangmao Bay. This study may provide valuable data and insights for a better understanding of planktonic ecosystem dynamics and the biogeochemical cycle in the coastal area of the SCS. |
| Key words: plankton plankton size tide Huangmao Sea |