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Impact of atypical ammonium concentrations on phytoplankton abundance and composition in fresh versus estuarine waters

机译：非典型铵浓度对淡水和河口水域浮游植物丰度和组成的影响

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ABSTRACT: The impact of atypically high ammonium (NH4+) concentrations delivered via treated wastewater effluent on phytoplankton community composition was investigated in a tidal slough connected with Suisun Bay in the northern part of San Francisco Bay. Input of effluent to a downstream location resulted in NH4+ concentrations of (mean ± SD) 1021 ± 380 µmol l-1, compared with 2.9 ± 1 µmol l-1 at a site further upstream, and 4.8 ± 1 µmol l-1 in Suisun Bay. Comparison of the diatom community at the downstream site in Pacheco Slough with that in Suisun Bay revealed a substantial overlap in species, including Cyclotella scaldensis, which dominated diatom species composition in both locations. The ratio of diatoms:other phytoplankton biomass (µmol3:µmol3) suggested that diatoms contributed a greater proportion of total phytoplankton community biomass at the downstream location (48.6 ± 87) versus in Suisun Bay (9.5 ± 1) or upstream (9.5 ± 8), and that diatoms can readily grow in the presence of NH4+ concentrations varying from 2 to 1350 µmol l-1. In the present investigation, species composition of the seeding population was found to be a more important predictor of final phytoplankton community composition than nutrient concentrations or ratios.
机译：摘要：研究了北部北部随苏湾的潮汐泥浆中非典型高浓度铵（NH 4 + ）通过处理后的废水排放对浮游植物群落组成的影响。旧金山湾的一部分。与下游相比，向下游位置输入废水导致NH 4 + 浓度为（平均值±SD）1021±380 µmol l -1 在更上游的位置为2.9±1 µmol l -1 ，而在遂孙湾为4.8±1 µmol l -1 。在帕切科泥沼下游地点的硅藻群落与随孙湾的硅藻群落进行比较后，发现物种之间存在实质性重叠，其中包括 Cyclotella scaldensis ，这两个地区都主导着硅藻物种的组成。硅藻：其他浮游植物生物量的比例（µmol 3 ：µmol 3 ）表明硅藻在下游位置占浮游植物群落总生物量的比例更大（48.6±87）与Suisun湾（9.5±1）或上游（9.5±8）相比，硅藻可以在NH 4 + 浓度介于2至1350之间变化的情况下容易生长µmol l -1 。在目前的调查中，发现播种种群的物种组成是最终浮游植物群落组成比营养物浓度或比例更重要的预测指标。

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