珠江口真核共生与寄生生物群落结构的季节变化

绿化理论学习：植物群落结构的理解 #生活技巧# #园艺绿化建议# #绿化理论#

摘要： 共生与寄生生物在维持海洋生态系统平衡和调节浮游生物群落结构过程中发挥着重要作用。本研究基于2020—2021年珠江口夏季和冬季7个调查站表层水样进行18S rDNA V4区高通量测序，系统分析了真核生物共生与寄生类群的群落结构及其季节变化。高通量测序结果共获得共生与寄生生物623条ASV序列，分别属于5门11科，寄生生物优势类群主要包括共甲藻目Syndiniales GroupⅠ、Ⅱ和Pirsoniaceae科，而共生生物以虫黄藻、棕囊藻等为优势。以上二者群落结构呈现显著的季节差异：夏季和冬季Syndiniales Group II均占优势(相对丰度36.00%~80.79%)，共生生物虫黄藻在珠江口外侧站位相对丰度较高。研究表明，珠江口真核共生与寄生类群的变化受环境梯度和水动力过程的影响，其在调节河口浮游生物群落结构过程中起着重要的作用。该研究成果可为深入解析河口真核共生与寄生生物的生态角色提供了重要依据。

关键词: 共生与寄生生物, 浮游生物, 群落结构, V4-18S rDNA, 高通量测序, 珠江口

Abstract: Symbiotic and parasitic eukaryotes play essential roles in maintaining marine ecosystem stability and regulating plankton community structure. During the summer of 2021 and the winter of 2022, surface water samples were collected from seven stations in the Pearl River Estuary. High-throughput sequencing of the 18S rDNA V4 region was used to investigate the community structure and seasonal dynamics of symbiotic and parasitic eukaryotes. A total of 623 ASVs, obtained from symbiotic and parasitic organisms, belonged to five phyla and eleven families. The predominant groups of parasites were Syndiniales Group I and II and the Pirsoniaceae whereas Symbiodiniaceae and Phaeocystis were one of the main symbiotic groups. Seasonal variations in their community structures were observed between the summer and winter. In particular, Syndiniales Group II was the predominant group in both seasons (relative abundance: 36.00~80.79%) while Symbiodiniaceae was more abundant in offshore waters. Our results suggest that the dynamics of these groups of eukaryotes is influenced by environmental gradients and hydrodynamic processes and plays an important role in the regulation of planktonic community structure in the estuary. Thus, this work offers significant information about the ecological functions of eukaryotic symbionts and parasites in estuarine environments.

Key words: Eukaryotic symbionts and parasites, Plankton community, Community composition, High-Throughput Sequencing, 18S rDNA V4 region, Pearl River Estuary

网址：珠江口真核共生与寄生生物群落结构的季节变化 https://klqsh.com/news/view/330771

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