Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin 300350, China.
College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin 300071, China.
Sci Total Environ. 2023 Dec 1;902:166169. doi: 10.1016/j.scitotenv.2023.166169. Epub 2023 Aug 9.
We investigated the geographical and environmental distance-decay relationships for both of the two bacteria in the Haihe River, Tianjin, China. HNA bacteria exhibited a stronger geographical variation-dependent pattern while LNA bacteria exhibited a stronger environmental variation-dependent pattern. Variance partition analysis (VPA), Mantel test, and partial mantel test validated the discrepant impacts of geographical distance and environmental factors on their two communities. The heterogeneous selection dominated community assembly of LNA bacteria demonstrates their greater sensitivity to environmental conditions. As the deterministic environmental factor, anthropogenic original dissolved organic matter (DOM) functions exclusively on LNA bacteria, and it is the critical factor leading to the discrepant biogeographical patterns of LNA and HNA bacteria. LNA bacteria interact with HNA bacteria and mediate the DOM driving total bacteria assembly. The LNA keystone taxa, Pseudomonas, Rheinheimera, Candidatus Aquiluna, and hgcl clade are capable to compete with HNA bacteria for anthropogenic original DOM, and are potential indicators of anthropogenic pollution. Our research reveals the non-negligible effect of the LNA bacteria in regulating the ecological response of total bacteria.
我们研究了中国天津海河两种细菌的地理和环境距离衰减关系。HNA 细菌表现出更强的地理变异依赖性模式，而 LNA 细菌表现出更强的环境变异依赖性模式。方差分解分析（VPA）、Mantel 检验和偏 Mantel 检验验证了地理距离和环境因素对它们两个群落的不同影响。LNA 细菌群落组装的异质选择主导表明它们对环境条件更敏感。作为确定性环境因素，人为原始溶解有机物质（DOM）专门作用于 LNA 细菌，是导致 LNA 和 HNA 细菌生物地理格局差异的关键因素。LNA 细菌与 HNA 细菌相互作用，并介导 DOM 驱动总细菌组装。LNA 关键类群假单胞菌、莱茵海默菌、Candidatus Aquiluna 和 hgcl 分支能够与 HNA 细菌竞争人为原始 DOM，是人为污染的潜在指标。我们的研究揭示了 LNA 细菌在调节总细菌生态响应方面的不可忽视的作用。
