Western Lake Erie (WLE) experiences anthropogenic eutrophication and annual, toxic cyanobacterial blooms of non-nitrogen (N) fixing Microcystis. Numerous studies have shown that bloom biomass is correlated with an increased proportion of soluble reactive phosphorus loading from the Maumee River. Long term monitoring shows that the proportion of the annual Maumee River N load of non-nitrate N, or total Kjeldahl nitrogen (TKN), has also increased significantly (Spearman's ρ = 0.68, p = 0.001) over the last few decades and is also significantly correlated to cyanobacterial bloom biomass (Spearman's ρ = 0.64, p = 0.003). The ratio of chemically reduced N to oxidized N (TKN:NO3) concentrations was also compared to extracted chlorophyll and phycocyanin concentrations from all weekly sampling stations within WLE from 2009 to 2015. Both chlorophyll (Spearman's ρ = 0.657, p < 0.0001) and phycocyanin (Spearman's ρ = 0.714, p < 0.0001) were significantly correlated with TKN:NO3. This correlation between the increasing fraction of chemically reduced N from the Maumee River and increasing bloom biomass demonstrates the urgent need to control N loading, in addition to current P load reductions, to WLE and similar systems impacted by non-N-fixing, toxin-producing cyanobacteria.

西伊利湖（WLE）经历了人为的富营养化和非氮（N）固定微囊藻的年度有毒蓝藻繁殖。大量研究表明，盛开的生物量与毛梅河中可溶性活性磷的负载比例增加有关。长期监测显示，在过去的几十年中，非硝态氮或总凯氏氮（TKN）的毛梅河年度氮负荷比例也显着增加（斯皮尔曼ρ= 0.68，p = 0.001），并且也与蓝藻水华生物量显着相关（Spearmanρ= 0.64，p = 0.003）。还比较了从2009年至2015年WLE内所有每周采样站提取的化学还原氮与氧化氮（TKN：NO3）浓度的比率。叶绿素（Spearmanρ= 0.657，p <0.0001）和藻蓝蛋白（Spearman的ρ= 0.714，p <0.0001）与TKN显着相关：3号 来自莫米河的化学还原氮的增加比例与盛开生物量的增加之间的相关性表明，除了当前的P负荷减少外，迫切需要控制WLE和受非N固定，毒素-毒素影响的类似系统中的N负荷。产生蓝细菌。