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首页> 外文期刊>Harmful Algae >The influence of the Pseudo-nitzschia toxin, domoic acid, on microzooplankton grazing and growth: A field and laboratory assessment
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The influence of the Pseudo-nitzschia toxin, domoic acid, on microzooplankton grazing and growth: A field and laboratory assessment

机译：假性奈瑟菌毒素，海藻酸对微藻浮游生物放牧和生长的影响：田间和实验室评估

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摘要

We conducted field and laboratory experiments to determine whether the Pseudo-nitzschia-derived metabolite, domoic acid (DA), functions as a microzooplankton grazing suppressant. Using the seawater dilution technique in natural plankton communities along the Pacific Northwest coast, we found no significant relationship between dissolved DA and microzooplankton grazing rate on Pseudo-nitzschia spp. Dilution experiments amended with either 50 or 80 nM dissolved DA also showed no evidence that microzooplankton community grazing was affected by DA. The relationship between Pseudo-nitzschia spp. intracellular DA and microzooplankton grazing was less clear. On a subset of data where small Pseudo-nitzschia spp. cells dominated community composition, an apparent negative relationship between intracellular DA and microzooplankton grazing was observed. However, we provide evidence that this relationship is a microzooplankton response to Pseudo-nitzschia spp. growth rate, rather than cellular DA. In laboratory experiments, two diatom-consuming dinoflagellates, Protoperidinium excentricum and P. pellucidum, were fed single and mixed diets of a toxic and non-toxic Pseudo-nitzschia species and an optimal prey, Ditylum brightwellii. P. excentricum did not grow or ingest either the toxic or non-toxic Pseudo-nitzschia. However, P. pellucidum grew as well on the toxic Pseudo-nitzschia multiseries as it did on D. brightwellii, but did not grow on the non-toxic Pseudo-nitzschia pungens. Both dinoflagellates were capable of growing if Pseudo-nitzschia spp. diets were mixed with D. brightwellii. Addition of dissolved DA also had no negative effect on dinoflagellate growth when fed the optimal diatom diet. We conclude that domoic acid has no functional role in deterring microzooplankton grazing or growth rates. Further, our findings highlight the difficulty of defining the complex mechanisms that regulate predator and prey interactions within microplankton food webs.
机译：我们进行了野外和实验室实验，以确定假性奈瑟菌来源的代谢产物多摩酸（DA）是否可作为微浮游动物的放牧抑制剂。在西北太平洋沿岸的天然浮游生物群落中使用海水稀释技术，我们发现拟南芥属物种中溶解的DA与微带藻的放牧率之间没有显着关系。用50或80 nM溶解的DA进行的稀释实验也未显示出微浮游动物群落放牧受到DA影响的证据。假性尼兹菌属之间的关系。细胞内DA和微带浮游生物的放牧尚不清楚。在一个小伪拟南芥属的数据子集上。细胞占主导地位的社区组成，细胞内DA和微浮游动物放牧之间存在明显的负相关关系。但是，我们提供的证据表明，这种关系是对拟南芥属物种的微浮游动物反应。增长率，而不是蜂窝DA。在实验室实验中，食用了两种食用硅藻的鞭毛藻，分别是有毒和无毒的拟南芥属物种和最佳猎物Ditylum Brightwellii，分别食用了混合的饮食。 P. excentricum没有生长或摄入有毒或无毒假性尼兹菌。然而，P。pellucidum在有毒假单胞菌多系列上的生长也与在D. Brightwellii上一样好，但在无毒假单胞菌的刺上不生长。如果假奈瑟菌属，两个鞭毛虫都能够生长。饮食与D. Brightwellii混合。当饲喂最佳的硅藻饮食时，添加溶解的DA对鞭毛藻的生长也没有负面影响。我们得出的结论是，海藻酸在阻止微浮游动物的放牧或生长速度方面没有功能性作用。此外，我们的发现凸显了定义复杂的机制来调节微浮游生物食物网中捕食者与猎物相互作用的困难。

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  • 来源
    《Harmful Algae》 |2010年第6期|P.540-547|共8页
  • 作者

    M. Brady Olson; rnEvelyn J. Lessard;

  • 作者单位

    School of Oceanography, University of Washington, Seattle, WA 98195, United States Shannon Point Marine Center, Western Washington University, Anacortes, WA 98221, United States;

    rnSchool of Oceanography, University of Washington, Seattle, WA 98195, United States;

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  • 正文语种 eng
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  • 关键词

    domoic acid; grazing; microzooplankton; pseudo-nitzschia;

    机译：海藻酸放牧;微带浮游生物假性痴呆;

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