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Sinking of Heterosigma akashiwo results in increased toxicity of this harmful algal bloom species

机译：Heterosigma akashiwo的沉没导致这种有害藻华物种的毒性增加

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摘要

Notable physiological responses such as toxicity and sinking rates of the red tide forming raphidophyte Heterosigma akashiwo are correlated with high levels of macronutrient stress. Individual cells of this species are also capable of forming benthic vegetative cysts that overwinter in marine sediment and contribute to bloom propagation in subsequent seasons. It was hypothesized that there is variability in the rates of sinking within cell cultures and that sinking cells are more toxic than the neutrally buoyant or floating cells. Using laboratory-based settling columns, various isolates of H. akashiwo were allowed to separate, and the toxicities of sinking and floating populations were analyzed. Sinking and floating rates were significantly higher during the late stationary growth phase for all isolates. For two H. akashiwo isolates, sinking populations were significantly more toxic than those that were positively buoyant. A similar trend was observed in a third strain, however the relationship was not significant. Differences in adaptive ecophysiology among the different strain likely caused the variation. It is suggested that the most toxic cells within a bloom are those found at the lower depths, potentially interacting with the benthic community or ensuring that subsequent bloom propagation contains cells with the potential for toxicity.
机译：显着的生理反应，例如毒性和形成赤潮水生植物杂种牛赤潮的下沉率与大量营养素胁迫相关。该物种的单个细胞也能够形成底栖植物营养性囊肿，这些囊肿在海洋沉积物中越冬并有助于随后季节的水华繁殖。据推测，在细胞培养物中下沉的速率存在变化，并且下沉的细胞比中性浮力或漂浮细胞更具毒性。使用基于实验室的沉降柱，分离出各个akashiwo分离株，并对沉没和流动人口的毒性进行了分析。所有分离株在静止生长后期的下沉率和漂浮率均显着较高。对于两个akashiwo分离株，下沉的种群比阳性浮力的种群毒性更大。在第三株中观察到相似的趋势，但是该关系并不显着。不同菌株之间适应性生态生理的差异可能导致了变异。有人认为，花朵内毒性最大的细胞是在较低深度处发现的细胞，它们可能与底栖生物相互作用，或确保随后的花朵繁殖包含潜在的毒性细胞。

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  • 来源
    《Harmful Algae》 |2012年第1期|p.95-104|共10页
  • 作者

    Lucas Powers; Irena F. Creed; Charles G. Trick;

  • 作者单位

    Department of Biology, University of Western Ontario, London, Ontario N6A 5B7, Canada;

    Department of Biology, University of Western Ontario, London, Ontario N6A 5B7, Canada;

    Department of Biology, University of Western Ontario, London, Ontario N6A 5B7, Canada,Department of Microbiology and Immunology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario N6A 5B7, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    heterosigma akashiwo; sinking; bioassays; toxicity; bloom propagation;

    机译：阿卡西沃下沉生物测定毒性;盛开繁殖;

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