| 摘要: |
| 于2014年5月在长江口海域采集海水样品，分析了浮游植物种类组成、细胞丰度、优势种等群落结构特征。共鉴定浮游植物105种，其中硅藻30属56种，甲藻19属41种，以及隶属于金藻、蓝藻等的8个种。浮游硅藻以近岸半咸水种为主，优势种类是中肋骨条藻（Skeletonema costatum）；浮游甲藻以沿岸广布种为主，典型代表是东海原甲藻（Prorocentrum donghaiense）。为了更好地了解长江口海域浮游植物的年际变化趋势，本文收集整理了该海域1986-2014年间的春季数据，分析了浮游硅藻、浮游甲藻主要群落特征的年际变化，以及浮游硅藻优势种类细胞粒径的变化趋势。结果表明：（1）浮游硅藻、浮游甲藻的种类数均呈现不同程度的上升趋势，浮游甲藻的上升幅度更为明显；（2）浮游甲藻种类数在浮游植物种类数中的占有比例呈上升趋势，而浮游硅藻所占比例呈下降趋势；（3）浮游硅藻优势种类的细胞粒径呈现小型化趋势。 |
| 关键词: 浮游植物 长江口 春季 年际变化 硅藻 甲藻 小型化 |
| DOI：10.11693/hyhz20160700148 |
| 分类号: |
| 基金项目:国家自然科学基金项目，31570205号，31370235号；中国科学院海洋战略先导专项，XDA11020304号。 |
|
| Interdecadal variation of phytoplankton assemblage in Changjiang River Estuary in spring |
|
LIN Mei, LI Yang
|
|
Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, College of Life Science, South China Normal University, Guangzhou 510631, China
|
| Abstract: |
| Water samples were collected from Changjiang River estuary in May, 2014. The phytoplankton assemblage were analyzed and characterized in terms of species composition, cell abundance, members, and ecological distribution of the dominant species. Totally, 105 taxa were recorded, containing 56 taxa belonging to 30 genera in Bacillariophyta and 41 taxa belonging to 19 genera in Dinophyta. The ecotypse of most diatom species were eurythermal, euryhaline, and cosmopolitan. Skeletonema costatum (Greville) Cleve was the dominant. Most dinoflagellates were near-shore cosmopolitans represented by Prorocentrum donghaiense Lu. Meanwhile, to understand the interdecadal variation of phytoplankton assemblage in the study areas, relative data in the spring from 1986 to 2014 were collected and compared. Results show that in the past nearly 30 years, the species diversity climbed in both diatoms and dinoflagellates, of which dinoflagellates were much more remarkable; the contribution of diatom diversity to total phytoplankton diversity declined, while the proportion of dinoflagellates diversity increased correspondingly; and the average cell size of the dominant diatom species presented a tread of miniaturization. |
| Key words: phytoplankton Changjiang River estuary spring interdecadal variation diatom dinoflagellate miniaturization |
