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首页> 外文期刊>Harmful Algae >Effects of the toxic dinoflagellate Alexandrium catenella on histopathogical and escape responses of the Northern scallop Argopecten purpuratus
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Effects of the toxic dinoflagellate Alexandrium catenella on histopathogical and escape responses of the Northern scallop Argopecten purpuratus

机译：有毒的鞭毛藻亚历山大藻对北方扇贝红斑紫癜的组织病理学和逃避反应的影响

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摘要

Juvenile Northern scallops Argopecten purpuratus were exposed to cultures of the paralytic shellfish toxin (PST) producing dinoflagellate, Alexandrium catenella, or a non-toxic microalga as a control, T-iso. After 3 and 6 days of exposure to either A catenella or T-iso, scallops were stimulated to elicit an escape response by exposing them to the predatory sea star Meyenastergelatinosus. We monitored the escape response of the scallops in terms of reaction time after first contact with the sea star, number of claps (burst of rapid valve closures) until exhaustion, clapping time, clapping rate, the time scallops spent closed when exhausted, and recovery from the initial number of claps, clapping time and clapping rate. Additionally, histopathological and stress responses (through heat-shock protein [hsp70J induction), as well as accumulation of Paralytic Shellfish Poisoning (PSP) toxins, were monitored on scallops after 3 and 6 days of exposure to A catenella. After 6 days of exposure, scallops exposed to A catenella accumulated PSTs and reacted more rapidly with a higher clapping rate, however the duration of their escape response was shorter than controls, when exposed to M. gelatinosus. Additionally, scallops exposed to A catenella showed histopathological features, especially after 6 days of exposure, including increased melanization of the tissues and myopathy, with high levels of degeneration of the muscle fibers. A six-day exposure to A catenella also caused an increase in prevalence of rickettsiales-like organisms within scallop tissues. This study suggests that PST accumulation can affect the interaction between the Northern scallop and both pathogens and predators, potentially increasing their susceptibility to either of them.
机译：少年北扇贝Argopecten purpuratus暴露于麻痹性贝类毒素（PST）的培养物中，产生了鞭毛藻，亚历山大毛虫或无毒微藻作为对照T-iso。在暴露于A连毛虫或T-iso的3天和6天后，通过将扇贝暴露于掠食性海星Meyenastergelatinosus来刺激扇贝引发逃逸反应。我们从第一次接触海星后的反应时间，拍击直至到达精疲力竭的拍击次数（快速关闭阀门的爆裂），拍拍时间，拍拍率，扇贝耗尽时关闭所花费的时间和恢复情况来监控扇贝的逃逸响应从拍手的初始数量，拍手时间和拍手率开始。此外，在扇贝暴露于A接触毛虫3天和6天后，对扇贝进行组织病理学和应激反应（通过热休克蛋白[hsp70J诱导]以及麻痹性贝类中毒（PSP）毒素的积累）进行监测。暴露6天后，暴露于A链球菌的扇贝积累了PST，并以更高的拍击速度更快地反应，但是当暴露于明胶支原体时，它们的逃避反应的持续时间短于对照。此外，扇贝暴露于链状杆菌也表现出组织病理学特征，尤其是在暴露6天后，包括组织的黑色素增加和肌病以及肌肉纤维高度变性。六天的A接触毛虫也导致扇贝组织内立克次氏体样生物的患病率增加。这项研究表明，PST的积累会影响北部扇贝与病原体和捕食者之间的相互作用，从而可能增加它们对其中任何一种的敏感性。

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  • 来源
    《Harmful Algae》 |2012年第6期|p.74-83|共10页
  • 作者

    Helene Hegaret; Katherina B. Brokordt; Carlos F. Gaymer; Karin B. Lohrmann; Carlos Garcia; Daniel Varela;

  • 作者单位

    Centro i～mar, Universidad de Los Lagos, Casilla 557, Puerto Montt, Chile,Universite de Bretagne Occidentale -IUEM, LEMAR CNRS UMR 6539, Place Nicolas Copernic, Technopole Brest Iroise, 29280 Plouzane, France;

    Centro de Estudios Avanzados en Zonas Aridas (CEAZA), Universidad Catolica del Norte, Casilla 117, Coquimbo, Chile;

    Departamento de Biologia Marina, Universidad Catolica del Norte, Casilla 117, Coquimbo, Chile, Centro de Estudios Avanzados en Zonas Aridas (CEAZA), Universidad Catolica del Norte, Casilla 117, Coquimbo, Chile,Instituto de Ecologia y Biodiversidad (1EB), Casilla 653, Santiago, Chile;

    Departamento de Biologia Marina, Universidad Catolica del Norte, Casilla 117, Coquimbo, Chile;

    Universidad de Chile, Fac Med, Programa Fisiol & Biofis, Lab Bioquim Membrana, Santiago 7, Chile;

    Centro i～mar, Universidad de Los Lagos, Casilla 557, Puerto Montt, Chile;

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  • 正文语种 eng
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  • 关键词

    scallop; alexandrium; HAB; escape response; histopathology; PSP;

    机译：扇贝;亚历山大草;HAB;逃避反应;组织病理学PSP;

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