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首页> 外文期刊>Harmful Algae >Effects of ocean acidification on the growth, photosynthetic performance, and domoic acid production of the diatom Pseudo-nitzschia australis from the California Current System
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Effects of ocean acidification on the growth, photosynthetic performance, and domoic acid production of the diatom Pseudo-nitzschia australis from the California Current System

机译：海洋酸化对加州电流系统达达型伪尼科西亚澳大利亚岛生长，光合成绩和多偏见的影响

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摘要

Pseudo-nitzschia australis (Frenguelli), a toxigenic pennate diatom capable of producing the neurotoxin domoic acid (DA), was examined in unialgal laboratory cultures to quantify its physiological response to ocean acidification (OA) - the decline in pH resulting from increasing partial pressure of CO2 (pCO(2)) in the oceans. Toxic blooms of P. australis are common in the coastal waters of eastern boundary upwelling systems (EBUS), including those of the California Current System (CC S) off the west coast of the United States where increased pCO(2) and decreased seawater pH are well-known. This study determined the production of dissolved (dDA) and particulate DA (pDA), the rates of growth and nutrient (nitrate, silicate and phosphate) utilization, cellular elemental ratios of carbon and nitrogen, and the photosynthetic response to declining pH during the exponential and stationary growth phases of a strain of P. australis isolated during a massive toxic bloom that persisted for months along much of the U.S. west coast during 2015. Our controlled lab studies showed that DA production significantly increased as pCO(2) increased, and total DA (pDA + dDA) normalized to cell density was 2.7 fold greater at pH 7.8 compared to pH 8.1 (control) during nutrient-limited stationary growth. However, exponential growth rates did not increase with declining pH, but remained constant until pH of 7.8 was reached, and then specific growth rates declined by ca. 30%. The toxin results demonstrate that despite minimal effects of OA observed during the nutrient-replete exponential growth phase, the enhancement of DA production, notably the 3-fold increase in particulate DA per cell, with declining pH from 8.1 to 7.8 during the nutrient-depleted stationary phase, supports the hypothesis that increasing pCO(2) will result in greater toxic risk to coastal ecosystems from elevated ambient concentrations of particulate DA. The ecological consequences of decreasing silicate uptake rates and increasing cellular carbon quotas with declining pH may potentially ameliorate some negative impacts of OA on Pseudo-nitzschia growth in natural systems.
机译：在单核实验室培养中检测了能够产生神经毒素大肠酸（DA）的毒素丛生硅藻，以定量对海洋酸化（OA）的生理反应 - 因增加部分压力而导致的pH值下降的生理反应在海洋中的二氧化碳（PCO（2））。 P. Australis的毒性绽放在东部边界升空系统（EBUS）的沿海水域中常见，包括加州当前系统（CC S）的美国西海岸，其中PCO（2）增加，海水博士减少是众所周知的。该研究确定了溶解（DDA）和颗粒状DA（PDA）的产生，生长率和营养素（硝酸盐，硅酸盐和磷酸盐）利用率，细胞元素比例的碳和氮，以及在指数期间对pH下降的光合反应。在巨大的有毒绽放中孤立的P. Australis菌株的固定生长阶段仍然存在于2015年的大部分地区的几个月。我们的受控实验室研究表明，随着PCO（2）的增加，DA生产明显增加，总计与pH 7.8相比，在pH 7.8中归一化至细胞密度的DA（PDA + DDA）与营养有限的固定生长期间的pH8.1（对照）相比，pH 7.8较高。然而，指数增长率不会随pH下降而增加，但在达到7.8的pH之前，仍然保持不变，然后加利福尼亚州的具体增长率下降。 30％。毒素结果表明，尽管OA在营养 - 新的指数生长阶段观察到的OA效应最小，但在营养耗尽期间，颗粒生产的增强，特别是颗粒DA的颗粒状达3倍。静止阶段支持增加PCO（2）将导致沿海生态系统从升高的颗粒浓度的颗粒浓度导致沿海生态系统产生更大毒性风险。减少硅酸盐吸收率和增加pH值下降的细胞碳配额的生态后果可能会对OA对自然系统伪尼科西亚的生长产生一些负面影响。

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  • 来源
    《Harmful Algae》 |2021年第7期|102030.1-102030.18|共18页
  • 作者

    Wingert Charles J.; Cochlan William P.;

  • 作者单位

    San Francisco State Univ Estuary & Ocean Sci Ctr 3150 Paradise Dr Tiburon CA 94920 USA|Univ N Carolina Ctr Marine Sci MARBIONC Algal Resources Collect 5600 Marvin K Moss Lane Wilmington NC 28403 USA;

    San Francisco State Univ Estuary & Ocean Sci Ctr 3150 Paradise Dr Tiburon CA 94920 USA;

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  • 正文语种 eng
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  • 关键词

    Diatom; Domoic acid; HAB; Pseudo-nitzschia australis; Ocean acidification;

    机译：硅藻;domosid;hab;pseudo-nitzschia australis;海洋酸化;

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