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首页> 外文期刊>Aquatic Sciences >Anthropogenic land use is associated with N-fixing cyanobacterial dominance in lakes across the continental United States
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Anthropogenic land use is associated with N-fixing cyanobacterial dominance in lakes across the continental United States

机译：在美国大陆上的湖泊中，人为土地利用与固氮蓝细菌占主导地位

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Cyanobacteria cause many water quality problems in lakes worldwide. Although many studies have examined factors that influence the structure of cyanobacterial communities, few have explicitly compared the effects of within-lake conditions (e.g., nutrient concentrations) and watershed parameters (e.g., land use) on a diverse array of cyanobacterial taxa. Here, we analyzed data from the 2007 U.S. Environmental Protection Agency's National Lakes Assessment to quantify how lakeshore anthropogenic land use, nutrient concentrations and ratios, and surface water temperatures predict cyanobacterial biovolume and dominance in 236 naturally-formed lakes spanning the continental U.S. We observed that anthropogenic lakeshore land use was the best predictor for cyanobacterial dominance, whereas in-lake nitrogen (N) and phosphorus (P) concentrations were the best predictors for cyanobacterial biovolume. Our analyses suggest that anthropogenic land use may influence cyanobacterial dominance via means other than increased nutrient concentrations. The sum of agricultural and human-developed lakeshore land use was the best predictor of N-fixing cyanobacterial dominance, but there was no significant relationship between anthropogenic land use and non-N-fixing cyanobacterial dominance. In addition, we observed a total N:P ratio threshold for cyanobacterial dominance in the phytoplankton community (150:1) that was much higher than previously reported ratios. Consequently, management strategies to control cyanobacteria need to account for eco-physiological variation among different cyanobacterial taxa, and should consider nutrients and the other effects of land use to control overall lake cyanobacterial biovolume and cyanobacterial dominance, as the two cyanobacterial metrics may be sensitive to different drivers.
机译：蓝细菌在全世界的湖泊中引起许多水质问题。尽管许多研究已经研究了影响蓝细菌群落结构的因素，但很少有人明确比较了湖内条件（例如养分浓度）和分水岭参数（例如土地利用）对各种各样的蓝细菌类群的影响。在这里，我们分析了2007年美国环境保护局国家湖泊评估的数据，以量化湖岸人为土地利用，养分浓度和比例以及地表水温如何预测横跨美国大陆的236个自然形成的湖泊中的蓝细菌生物量和优势。人为的湖岸土地利用是蓝藻优势度的最佳预测因子，而湖中氮（N）和磷（P）浓度是蓝藻生物量的最佳预测因子。我们的分析表明，人为土地利用可能会通过增加养分浓度以外的其他方式影响蓝藻的优势地位。农业和人类开发的湖岸土地利用的总和是固氮细菌优势的最佳预测指标，但人为土地利用与固氮细菌优势没有显着关系。此外，我们观察到浮游植物群落中蓝藻优势度的总N：P比阈值（150：1）比以前报道的比率高得多。因此，控制蓝细菌的管理策略需要考虑到不同蓝细菌类群之间的生态生理变化，并应考虑营养成分和土地利用的其他影响，以控制整个湖泊蓝细菌的生物量和蓝细菌的优势，因为这两个蓝细菌指标可能对不同的驱动程序。

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