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Understanding the blob bloom: Warming increases toxicity and abundance of the harmful bloom diatom Pseudo-nitzschia in California coastal waters

机译:了解斑点绽放:变暖会增加加利福尼亚沿海水域中有害绽放硅藻拟南芥的毒性和丰度

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摘要

The toxic diatom genus Pseudo-nitzschia produces environmentally damaging harmful algal blooms (HABs) along the U.S. west coast and elsewhere, and a recent ocean warming event coincided with toxic blooms of record extent. This study examined the effects of temperature on growth, domoic acid toxin production, and competitive dominance of two Pseudo-nitzschia species from Southern California. Growth rates of cultured P. australis were maximal at 23 degrees C (similar to 0.8 d(-1)), similar to the maximum temperature recorded during the 2014-2015 warming anomaly, and decreased to similar to 0.1 d(-1) by 30 degrees C. In contrast, cellular domoic acid concentrations only became detectable at 23 degrees C, and increased to maximum levels at 30 degrees C. In two incubation experiments using natural Southern California phytoplankton communities, warming also increased the relative abundance of another potentially toxic local species, P. delicatissima. These results suggest that both the toxicity and the competitive success of particular Pseudo-nitzschia spp. can be positively correlated with temperature, and therefore there is a need to determine whether harmful blooms of this diatom genus may be increasingly prevalent in a warmer future coastal ocean. (C) 2017 Elsevier B.V. All rights reserved.
机译:有毒的硅藻属伪藻(Pseudo-nitzschia)会在美国西海岸和其他地区产生对环境有害的有害藻华(HAB),最近的海洋变暖事件与有记录的毒性华藻同时发生。这项研究检查了温度对来自南加利福尼亚州的两种拟南芥属物种的生长,藻酸毒素产生和竞争优势的影响。在23摄氏度(约0.8 d(-1))下,养殖的澳大利亚对虾的生长速率最大,与2014-2015年变暖异常期间记录的最高温度相似,到2000年降低到约0.1 d(-1)。 30摄氏度。相比之下,细胞中的藻酸浓度仅在23摄氏度时才可检测到,并在30摄氏度时达到最高水平。在使用南加州天然浮游植物群落进行的两个温育实验中,变暖还增加了另一种潜在毒性物质的相对丰度。当地种,P。delicatissima。这些结果表明,特定的拟南芥属物种的毒性和竞争性成功。硅藻的温度与温度呈正相关,因此有必要确定这种硅藻属的有害开花在未来更温暖的沿海海洋中是否越来越普遍。 (C)2017 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Harmful Algae》 |2017年第7期|36-43|共8页
  • 作者单位

    Univ Southern Calif, Marine & Environm Biol, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Marine & Environm Biol, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Marine & Environm Biol, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Marine & Environm Biol, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Marine & Environm Biol, Los Angeles, CA 90089 USA;

    Univ Southern Calif, Marine & Environm Biol, Los Angeles, CA 90089 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Domoic acid; Pseudo-nitzschia; Warming; Temperature; HAB; The blob;

    机译:海藻酸;假性尼兹菌;温热;温度;HAB;斑点;

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