Aquatic EcoHealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Zhejiang Provincial Key Lab for Water Environment and Marine Biological Resources Protection, Institute for Eco-Environmental Research of Sanyang Wetland, Wenzhou University, Wenzhou 325035, China.
National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Zhejiang Provincial Key Lab for Water Environment and Marine Biological Resources Protection, Institute for Eco-Environmental Research of Sanyang Wetland, Wenzhou University, Wenzhou 325035, China.
Water Res. 2024 Feb 15;250:120977. doi: 10.1016/j.watres.2023.120977. Epub 2023 Dec 6.
Eutrophication of inland waters is a mostly anthropogenic phenomenon impacting aquatic biodiversity worldwide, and might change biotic community structure and ecosystem functions. However, little is known about the patterns of cyanobacterial community variations and changes both on alpha and beta diversity levels in response to eutrophication. Here, we investigated cyanobacterial communities sampled at 140 sites from 59 lakes and reservoirs along a strong eutrophication gradient in eastern China through using CPC-IGS and 16S rRNA gene amplicon sequencing. We found that taxonomic diversity increased, but phylogenetic diversity decreased significantly along the eutrophication gradient. Both niche width and niche overlap of cyanobacteria significantly decreased from low- to high-nutrient waterbodies. Cyanobacterial community distance-decay relationship became weaker from mesotrophic to hypereutrophic waterbodies, while ecological uniqueness (i.e., local contributions to beta diversity) tended to increase in high-nutrient waterbodies. Latitude and longitude were more important in shaping cyanobacterial community structure than other environmental variables. These findings suggest that eutrophication affects alpha and beta diversity of cyanobacterial communities, leading to increasingly similar community structures in lakes and reservoirs with a higher level of eutrophication. Our work highlights how cyanobacterial communities respond to anthropogenic eutrophication and calls for an urgent need to develop conservation and management strategies to control lake eutrophication and protect freshwater biodiversity.
内陆水域富营养化是一种主要由人为因素引起的现象，影响着全球水生生物多样性，可能改变生物群落结构和生态系统功能。然而，人们对富营养化条件下蓝藻群落变化及其在α和β多样性水平上的变化模式知之甚少。在这里，我们通过使用 CPC-IGS 和 16S rRNA 基因扩增子测序，调查了来自中国东部沿强烈富营养化梯度的 59 个湖泊和水库的 140 个采样点的蓝藻群落。我们发现，随着富营养化梯度的增加，分类多样性显著增加，而系统发育多样性显著降低。蓝藻的生态位宽度和生态位重叠都从低营养水体到高营养水体显著降低。从中营养水体到富营养水体，蓝藻群落的距离衰减关系变得较弱，而高营养水体的生态独特性（即对β多样性的局部贡献）则趋于增加。纬度和经度对蓝藻群落结构的塑造比其他环境变量更为重要。这些发现表明，富营养化影响了蓝藻群落的α和β多样性，导致富营养化程度较高的湖泊和水库中群落结构越来越相似。我们的工作强调了蓝藻群落对人为富营养化的响应，并呼吁迫切需要制定保护和管理策略来控制湖泊富营养化，保护淡水生物多样性。
