| 摘要: |
| 城市化的加剧导致城市河流中的水质恶化、栖息地丧失及生态系统退化，对鱼类等水生生物群落产生了显著影响。解析随机性过程和确定性过程在群落组装中的相对影响对于鱼类保护至关重要。本研究采用环境DNA技术和传统调查方法，对广州市城市河流30个点位进行鱼类监测，进一步分析鱼类群落特征及其组装机制。结果表明：（1）广州市城市河流鱼类群落呈现出高多样性特征，环境DNA监测到15目39科139种，传统调查监测到6目10科32种属，主要以鲤形目（Cypriniformes）、虾虎鱼目（Gobiiformes）和鲇形目（Siluriformes）为主，外来物种如齐氏罗非鱼等占据优势。（2）环境因子对环境DNA和传统调查鱼类群落结构差异的解释率分别为49.26%和61.15%。其中pH、溶解氧以及高锰酸盐指数等对鱼类群落结构变化有显著影响。这表明水质参数在塑造鱼类群落多样性和分布方面起着关键作用。（3）群落组装机制分析表明，确定性过程在广州河流鱼类群落组装中占主导地位，但扩散限制等随机过程的影响亦不可忽视。 |
| 关键词: 城市河流 环境DNA 鱼类群落 群落组装 环境过滤 |
| DOI： |
| 分类号: |
| 基金项目:国家自然基金面上项目（42477489） |
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| Environmental DNA-based Biotic Monitoring Reveals Fish Community Assembly Mechanisms in Urban RiversHe Wenxiang1, Zou Yanting2,*, Hu Danxin1,Hao Huibo2, Wu Jingze2, Liuzifang2, Zhang Yuan2 |
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He Wenxiang,ZOUYANTING,Hu Danxin,Hao Huibo,Wu Jingze,Liu Zifang,Li Feilong,Zhang Yuan
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School of Ecology, Environment and Resources, Guangdong University of Technology
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| Abstract: |
| The deterioration of water quality, loss of habitats, and degradation of ecosystems in urban rivers, caused by intensified urbanization, have significantly impacted aquatic biological communities, including fish. Analyzing the relative contributions of stochastic processes and deterministic processes in community assembly is essential for fish conservation. In this study, fish monitoring was conducted at 30 sampling sites in Guangzhou"s urban rivers using both environmental DNA (eDNA) and traditional survey methods. The composition and assembly mechanisms of fish communities were subsequently analyzed. The results showed: (1) The fish communities in Guangzhou"s urban rivers exhibit high diversity characteristics. eDNA monitoring detected 15 orders, 39 families, and 139 species, while traditional surveys detected 6 orders, 10 families, and 32 species (genus). The fish assemblage was predominantly composed of Cypriniformes, Gobiiformes, and Siluriformes, with invasive species such as Coptodon zillii demonstrating ecological dominance. (2) Environmental factors explained 49.26% and 61.15% of community structure variance for eDNA and traditional survey data respectively. Key water quality parameters including pH, dissolved oxygen, and permanganate index, exerted significant effects on fish community restructuring, underscoring their pivotal role in shaping community diversity and spatial distribution patterns. (3) Analysis of community assembly mechanisms indicates that deterministic processes primarily govern the assembly of fish communities in Guangzhou"s rivers, while the impact of stochastic processes, including dispersal limitation, remains significant. |
| Key words: Urban rivers eDNA Fish communities Community assembly Environmental filtering |
