Gao Pengfei, Wang Peng, Ding Mingjun, Zhang Hua, Huang Gaoxiang, Nie Minghua, Wang Guangwei
School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, Jiangxi, China; Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, Jiangxi, China.
School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, Jiangxi, China; Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, Jiangxi, China.
Environ Res. 2023 May 1;224:115561. doi: 10.1016/j.envres.2023.115561. Epub 2023 Feb 23.
The biogeographical distribution of plants and animals has been extensively studied, however, the biogeographical patterns and the factors that influence bacterial communities in lakes over large scales are yet to be fully understood, even though they play critical roles in biogeochemical cycles. Here, bacterial community compositional data, geographic information, and environmental factors were integrated for 326 Chinese lakes based on previously published studies to determine the underlying factors that shape bacterial diversity among Chinese lakes. The composition of bacterial communities significantly varied among the three primary climatic regions of China (Northern China, NC; Southern China, SC; and the Tibetan Plateau, TIP), and across two different lake habitats (waters and sediments). Sediment bacterial communities exhibited significantly higher alpha-diversity and distance-decay relationships compared to water communities. The results indicate that the "scale-dependent patterns" of controlling factors, primarily influenced by geographical factors, become increasingly pronounced as the spatial scale increases. At a national scale, geographical factors exerted a dominant influence on both the water and sediment communities across all lakes, as geographical barriers restrict the dispersal of individuals. At smaller spatial scales, temperature-driven selection effects played a greater role in shaping water bacterial community variation in the NC, SC, and TIP, while geographical factors had a stronger association with sediment bacterial community variation in the lakes of the three regions. This synthesis offers novel insights into the ecological factors that determine the distribution of bacteria in Chinese lakes.
植物和动物的生物地理分布已得到广泛研究，然而，尽管湖泊中的细菌群落在生物地球化学循环中发挥着关键作用，但大尺度上影响湖泊细菌群落的生物地理模式和因素仍未得到充分理解。在此，基于先前发表的研究，整合了326个中国湖泊的细菌群落组成数据、地理信息和环境因素，以确定塑造中国湖泊细菌多样性的潜在因素。中国三个主要气候区域（中国北方、南方和青藏高原）以及两种不同湖泊生境（水体和沉积物）中的细菌群落组成存在显著差异。与水体群落相比，沉积物细菌群落表现出显著更高的α多样性和距离衰减关系。结果表明，主要受地理因素影响的控制因素的“尺度依赖模式”随着空间尺度的增加而愈发明显。在国家尺度上，地理因素对所有湖泊的水体和沉积物群落均产生主导影响，因为地理屏障限制了个体的扩散。在较小的空间尺度上，温度驱动的选择效应在塑造中国北方、南方和青藏高原水体细菌群落变化方面发挥了更大作用，而地理因素与这三个区域湖泊沉积物细菌群落变化的关联更强。这一综合研究为决定中国湖泊中细菌分布的生态因素提供了新的见解。
