水生生物学报2026，Vol.50Issue(3)：43-54,12.DOI:10.3724/1000-3207.2025.2025.0331
基于eDNA揭示雅鲁藏布江中游浮游植物群落组装机制及其季节动态
eDNA REVEALS PHYTOPLANKTON COMMUNITY ASSEMBLY MECHANISMS AND SEASONAL DYNAMICS IN THE MIDDLE REACHES OF THE YARLUNG ZANGBO RIVER
摘要
Abstract
Phytoplankton,as a key and sensitive component of plateau river ecosystems,remains understudied in the middle reaches of the Yarlung Zangbo River regarding its species composition,seasonal dynamics,and particularly the mechanisms of community assembly and their responses to environmental factors.This study employed environmental DNA(eDNA)to systematically analyze the diversity,seasonal dynamics,and driving mechanisms of phytoplankton community in the middle reaches of the Yarlung Zangbo River.A total of 25 sampling sites were established,with water samples collected during both wet and dry seasons.Sequencing results identified six phytoplankton phyla,with Ochrophyta(57.65％)and Chlorophyta(32.42％)being the dominant groups.a-diversity analysis revealed no signifi-cant seasonal differences in Simpson and Shannon indices,while the Chao1 index was significantly higher during the dry season than the wet season(P＜0.05),indicating seasonal variation in species richness.Significant seasonal varia-tion in community structure was observed(R=0.214,P＜0.001),with both geographic and environmental distances exhibiting significant decay effects.Neutral and null models indicated that community assembly was dominated by deterministic processes,with homogenous selection as the primary mechanism.Canonical Correspondence Analysis(CCA)further revealed that water temperature(WT),altitude(ALT),electrical conductivity(EC),chemical oxygen demand(COD)and pH are key environmental factors influencing community structure.This study systematically eluci-dates the seasonal succession patterns and assembly mechanisms of phytoplankton community in the middle reaches of the Yarlung Zangbo River,providing scientific basis for the conservation of alpine river ecosystems and their response to climate change.关键词
雅鲁藏布江中游/浮游植物/eDNA/季节动态/群落组装Key words
Middle reaches of the Yarlung Zangbo River/Phytoplankton/eDNA/Seasonal dynamics/Community assembly分类
生物科学引用本文复制引用
谭加敏,徐佳杰,卫佩佩,刘傲,王陈,彭红丹,拉珠,巴桑..基于eDNA揭示雅鲁藏布江中游浮游植物群落组装机制及其季节动态[J].水生生物学报,2026,50(3):43-54,12.基金项目
国家自然科学基金(42271149) （42271149）
2024年度中央支持地方高校改革发展专项资金项目(藏财预指[2024]1号)资助[Supported by the National Natural Science Foundation of China(42271149) （藏财预指[2024]1号）
the 2024 Central Financial Funds for the Reform and Development of Local Universities(Xizang Finance Budget Instruction[2024]No.1)] （Xizang Finance Budget Instruction[2024]No.1）
