| SONG Shuqun,LI Zhao,LI Caiwen,YU Zhiming. 2017. The response of spring phytoplankton assemblage to diluted water and upwelling in the eutrophic Changjiang (Yangtze River) Estuary. Acta Oceanologica Sinica, 36(12):101－110 |
| The response of spring phytoplankton assemblage to diluted water and upwelling in the eutrophic Changjiang (Yangtze River) Estuary |
| 春季长江口富营养化水域浮游植物群集对冲淡水和上升流的响应 |
| Received:October 19, 2016 |
| DOI：10.1007/s13131-017-1094-z |
| Key words:phytoplankton species composition algal bloom upwelling estuary |
| 中文关键词: 浮游植物 物种组成 水华 上升流 河口 |
| 基金项目:The National Natural Science Foundation of China-Shandong Joint Fund for Marine Science Research Centers under contract No. U1606404; the Youth Project of Natural Science Foundation of Shandong Province under contract No. ZR2014DQ029; the Youth Project of National Natural Science Foundation of China under contract No. 41606128; the Scientific and Technological Innovation Project of Qingdao National Laboratory for Marine Science and Technology under contract Nos 2016ASKJ02 and 2015ASKJ02; the Aoshan Talents Program of Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASTP. |
| Author Name | Affiliation | E-mail | | SONG Shuqun | CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | | | LI Zhao | CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | | | LI Caiwen | CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | cwli@qdio.ac.cn | | YU Zhiming | CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China | |
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| Abstract: |
| A comprehensive study on the phytoplankton standing stocks, species composition and dominant species in the eutrophic Changjiang (Yangtze River) Estuary (CE) was conducted to reveal the response of phytoplankton assemblage to Changjiang Diluted Water (CDW) and upwelling in the spring. Phytoplankton presented peak standing stocks (13.03 μg/L of chlorophyll a, 984.5×103 cells/L of phytoplankton abundance) along the surface isohaline of 25. Sixty-six species in 41 genera of Bacillariophyta and 33 species in 19 genera of Pyrrophyta were identified, as well as 5 species in Chlorophyta and Chrysophyta. Karenia mikimotoi was the most dominant species, followed by Prorocentrum dentatum, Paralia sulcata, Pseudo-nitzschia delicatissima and Skeletonema costatum. A bloom of K. mikimotoi was observed in the stratified stations, where the water was characterized by low nitrate, low phosphate, low turbidity, and specific ranges of temperature (18-22 °C) and salinity (27-32). K. mikimotoi and P. dentatum accumulated densely in the upper layers along the isohaline of 25. S. costatum was distributed in the west of the isohaline of 20. Benthonic P. sulcata presented high abundance near the bottom, while spread upward at upwelling stations. CDW resulted in overt gradients of salinity, turbidity and nutritional condition, determining the spatial distribution of phytoplankton species. The restricted upwelling resulted in the upward transport of P. sulcata and exclusion of S. costatum, K. mikimotoi and P. dentatum. The results suggested that CDW and upwelling were of importance in regulating the structure and distribution of phytoplankton assemblage in the CE and the East China Sea. |
| 中文摘要: |
| 为了揭示春季浮游植物群集对长江冲淡水和上升流的响应，研究了长江口浮游植物的现存量、物种组成和优势物种。浮游植物在25等盐线附近呈现现存量高值（叶绿素a最大值13.03 μg/L，细胞丰度最大值984.5×103 cells/L）。共鉴定硅藻41属66种，甲藻19属33种，绿藻和金藻共5种。米氏凯伦藻是最优势物种，具齿原甲藻（东海原甲藻）、具槽帕拉藻、柔弱伪菱形藻和中肋骨条藻也有较高的优势度。在层化站位观测到一次米氏凯伦藻赤潮，水体呈现低硝酸盐、低磷酸盐、低浊度，温度和盐度的范围分别为18~22oC和27~32。米氏凯伦藻和具齿原甲藻主要分布在25等盐线附近的上层水体，中肋骨条藻分布在20等盐线以西水域。底栖性的具槽帕拉藻主要分布在下层水体，但在25号站附近被输送到水体上层，并在表层形成高值。长江冲淡水通过影响水体盐度、浊度和营养盐状况进而影响浮游植物物种的空间分布。长江口外的上升流将具槽帕拉藻从水体底层输送到上层，并阻断中肋骨条藻、米氏凯伦藻和具齿原甲藻的扩散。结果显示长江冲淡水和上升流在调控长江口及其邻近东海浮游植物群集的物种组成、丰度和空间分布中发挥重要作用。 |
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