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首页> 外文期刊>Environmental Science & Technology >Effects of Increasing Nitrogen and Phosphorus Concentrations on Phytoplankton Community Growth and Toxicity During Planktothrix Blooms in Sandusky Bay, Lake Erie
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Effects of Increasing Nitrogen and Phosphorus Concentrations on Phytoplankton Community Growth and Toxicity During Planktothrix Blooms in Sandusky Bay, Lake Erie

机译：伊利湖桑达斯基湾浮游藻盛开期间氮，磷浓度增加对浮游植物群落生长和毒性的影响

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摘要

Sandusky Bay experiences annual toxic cyanobacterial blooms dominated by Planktothrix agardhii/suspensa. To further understand the environmental drivers of these events, we evaluated changes in the growth response and toxicity of the Planktothrix-dominated blooms to nutrient amendments with orthophosphate (PO_4) and inorganic and organic forms of dissolved nitrogen (N; ammonium (NH_4), nitrate (NO_3) and urea) over the bloom season (June - October). We complemented these with a metagenomic analysis of the planktonic microbial community. Our results showed that bloom growth and microcystin (MC) concentrations responded more frequently to additions of dissolved N than PO_4, and that the dual addition of NH_4 + PO_4 and Urea + PO_4 yielded the highest MC concentrations in 54% of experiments. Metagenomic analysis confirmed that P. agardhii/suspensa was the primary MC producer. The phylogenetic distribution of nif H revealed that both heterocystous cyanobacteria and heterotrophic proteobacteria had the genetic potential for N_2 fixation in Sandusky Bay. These results suggest that as best management practices are developed for P reductions in Sandusky Bay, managers must be aware of the negative implications of not managing N loading into this system as N may significantly impact cyanobacterial bloom size and toxicity.
机译：桑达斯基湾每年都会发生有毒的蓝藻水华，主要发生在浮游植物/浮游生物/悬铃木上。为了进一步了解这些事件的环境驱动因素，我们评估了浮游生物主导的水华对正磷酸盐（PO_4）以及无机和有机形式的溶解氮（N;铵（NH_4），硝酸盐）对营养修正的变化及其毒性的变化。 （NO_3）和尿素）。我们用浮游微生物群落的宏基因组学分析来补充这些。我们的结果表明，花粉生长和微囊藻毒素（MC）浓度对溶解氮的反应比PO_4更为频繁，而NH_4 + PO_4和尿素+ PO_4的双重添加在54％的实验中产生最高的MC浓度。元基因组学分析证实，琼脂假单胞菌/ suspensa是主要的MC生产者。 nif H的系统发育分布表明，杂散性蓝细菌和异养性蛋白细菌都具有在桑达斯基湾固氮的遗传潜力。这些结果表明，随着桑达斯基湾减少磷的最佳管理方法的发展，管理人员必须意识到不管理氮向该系统中的负向管理，因为氮可能会严重影响蓝藻水华的大小和毒性。

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  • 来源
    《Environmental Science & Technology》 |2015年第12期|7197-7207|共11页
  • 作者

    Timothy W. Davis; George S. Bullerjahn; Taylor Tuttle; Robert Michael McKay; Susan B. Watson;

  • 作者单位

    Canada Centre for Inland Waters, Environment Canada, Burlington, Ontario L7S 1A1, Canada,NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, Michigan 48108, United States;

    Department of Biological Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States;

    Department of Biological Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States;

    Department of Biological Sciences, Bowling Green State University, Bowling Green, Ohio 43403, United States;

    Canada Centre for Inland Waters, Environment Canada, Burlington, Ontario L7S 1A1, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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