Cyanobacteria and cyanotoxins: the influence of nitrogen versus phosphorus.
Cyanobacteria and cyanotoxins: the influence of nitrogen versus phosphorus.
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DOI：
10.1371/journal.pone.0038757
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Wiedner C
中科院分区：
文献类型：
--
作者：
Dolman AM;Rücker J;Pick FR;Fastner J;Rohrlack T;Mischke U;Wiedner C
氮（N）与磷（P）在解释总蓝藻生物量、特定蓝藻分类群生物量和蓝藻毒素发生率方面的重要性测定了德国北部102个湖泊，利用方法将氮磷浓度联合变化的影响与氮磷差异变化的影响分开，在高磷浓度下，蓝藻的生物量消失，随着氮浓度的增加，蓝藻的生物量不断增加，这表明在高磷富集的湖泊潜在的氮限制。所有蓝藻类群的生物量高于平均联合NP浓度的湖泊，虽然一些念珠藻目的相对生物量较高，在较不丰富的湖泊。分类群被发现有不同的反应，差异N与P浓度，分类群之间的差异是不一致的假设，可能N2固定念珠藻目类群将有利于在低N相对于P条件。特别是细束丝藻和亚热带入侵物种总状拟金鱼草往往达到最高的生物量在湖泊与高氮相对于磷浓度。所有的蓝藻毒素组的浓度增加，增加TP和TN，与其可能的生产者的生物量一致。微囊藻毒素浓度与浮游丝菌agardhii的生物量有很强的相关性，但类毒素，柱孢毒素和麻痹性贝类毒素的浓度没有很强的相关性，任何个别类群。蓝藻不应该被视为一个单一的群体时，考虑到营养负荷的变化对浮游植物群落结构的潜在影响，也不应该N2固定念珠藻目。这是特别重要的，当考虑发生的蓝藻毒素，作为两个最丰富的潜在毒素生产念珠藻目在我们的研究中发现在湖泊中与高N相对于P富集。
The importance of nitrogen (N) versus phosphorus (P) in explaining total cyanobacterial biovolume, the biovolume of specific cyanobacterial taxa, and the incidence of cyanotoxins was determined for 102 north German lakes, using methods to separate the effects of joint variation in N and P concentration from those of differential variation in N versus P. While the positive relationship between total cyanobacteria biovolume and P concentration disappeared at high P concentrations, cyanobacteria biovolume increased continually with N concentration, indicating potential N limitation in highly P enriched lakes. The biovolumes of all cyanobacterial taxa were higher in lakes with above average joint NP concentrations, although the relative biovolumes of some Nostocales were higher in less enriched lakes. Taxa were found to have diverse responses to differential N versus P concentration, and the differences between taxa were not consistent with the hypothesis that potentially N2-fixing Nostocales taxa would be favoured in low N relative to P conditions. In particular Aphanizomenon gracile and the subtropical invasive species Cylindrospermopsis raciborskii often reached their highest biovolumes in lakes with high nitrogen relative to phosphorus concentration. Concentrations of all cyanotoxin groups increased with increasing TP and TN, congruent with the biovolumes of their likely producers. Microcystin concentration was strongly correlated with the biovolume of Planktothrix agardhii but concentrations of anatoxin, cylindrospermopsin and paralytic shellfish poison were not strongly related to any individual taxa. Cyanobacteria should not be treated as a single group when considering the potential effects of changes in nutrient loading on phytoplankton community structure and neither should the N2-fixing Nostocales. This is of particular importance when considering the occurrence of cyanotoxins, as the two most abundant potentially toxin producing Nostocales in our study were found in lakes with high N relative to P enrichment.