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Linking bacterial community shifts with changes in the dissolved organic matter pool in a eutrophic lake

生态学 有色溶解有机物 环境科学 生态系统 分水岭 富营养化 浮游细菌 生物地球化学循环 淡水生态系统 水生生态系统 有机质 营养物 浮游植物 湖泊生态系统 生物 机器学习 计算机科学
作者
Lei Zhang,Wangkai Fang,Xingchen Li,Guang Gao,Jiahu Jiang
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:719: 137387-137387 被引量:47
标识
DOI:10.1016/j.scitotenv.2020.137387
摘要

Aquatic bacterial communities play crucial roles in the circulation of nutrients in watershed ecosystems. However, the interaction between bacterial communities and chromophoric dissolved organic matter (CDOM) in freshwater ecosystems has not been studied in depth. In our study, we examined the constitution and interactions of CDOM with the bacterial community in Lake Chaohu and its inflow rivers under the influence of different exogenous pollutants. The results revealed that the bacterial community diversity in the inflow rivers was significantly lower than that in the lake sites. Clustering of different types of polluted inflow rivers integrated with the most abundant genera observed in specific areas indicated that environmentally guided species selection had a large impact on the composition of aquatic bacterial communities. Moreover, our study suggests that communities in lake environments may be more susceptible to interference through a variety of physiologies or via functional redundancy, allowing them to preserve their community structure. Through linear discriminant analysis effect size (Lefse) methods, we revealed that some taxa (from phylum to genus) were consistently enriched in the lake sites. Based on correlation network analysis results, the supersession niches of bacterial community members related to different CDOM in the biogeochemical process was determined. This study provides an ecological basis for the control of external pollution and the protection of the water environment in watershed ecosystems.
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