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• W2969892456 endingPage "134001" @default.
• W2969892456 startingPage "134001" @default.
• W2969892456 abstract "Higher microbial diversity was frequently observed in saline than fresh waters, but the underlying mechanisms remains unknown, particularly in microbial primary producers (MPP). MPP abundance and activity are notably constrained by high salinity, but facilitated by high nutrients. It remains to be ascertained whether and how nutrients regulate the salinity constraints on MPP abundance and community structure. Here we investigated the impact of nutrients on salinity constraints on MPP abundance and diversity in undisturbed lakes with a wide salinity range on the Tibetan Plateau. MPP community was explored using quantitative PCR, terminal restriction fragment length polymorphism and sequencing of cloning libraries targeting form IC cbbL gene. The MPP community structure was sorted by salinity into freshwater (salinity<1‰), saline (1‰ < salinity<29‰) and hypersaline (salinity>29‰) lakes. Furthermore, while MPP abundance, diversity and richness were significantly constrained with increasing salinity, these constraints were mitigated by enhancing total organic carbon (TOC) and total nitrogen (TN) contents in freshwater and saline lakes. In contrast, the MPP diversity increased significantly with the salinity in hypersaline lakes, due to the mitigation of enhancing TOC and TN contents and salt-tolerant MPP taxa. The mitigating effect of nutrients was more pronounced in saline than in freshwater and hypersaline lakes. The MPP compositions varied along salinity, with Betaproteobacteria dominating both the freshwater and saline lakes and Gammaproteobacteria dominating the hypersaline lakes. We concluded that high nutrients could mitigate the salinity constraining effects on MPP abundance, community richness and diversity. Our findings offer a novel insight into the salinity effects on primary producers and highlight the interactive effects of salinity and nutrients on MPP in lakes. These findings can be used as a baseline to illuminate the effects of increased anthropogenic activities altering nutrient dynamics on the global hydrological cycle and the subsequent responses thereof by MPP communities." @default.
• W2969892456 created "2019-08-29" @default.
• W2969892456 creator A5010270772 @default.
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• W2969892456 creator A5021342343 @default.
• W2969892456 creator A5081592514 @default.
• W2969892456 creator A5082554915 @default.
• W2969892456 date "2019-12-01" @default.
• W2969892456 modified "2023-10-07" @default.
• W2969892456 title "Community response of microbial primary producers to salinity is primarily driven by nutrients in lakes" @default.
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• W2969892456 doi "https://doi.org/10.1016/j.scitotenv.2019.134001" @default.
• W2969892456 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31454602" @default.
• W2969892456 hasPublicationYear "2019" @default.
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