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首页> 外文期刊>Harmful Algae >Effects of the toxic dinoflagellate Alexandrium catenella on the behaviour and physiology of the blue mussel Mytilus edulis
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Effects of the toxic dinoflagellate Alexandrium catenella on the behaviour and physiology of the blue mussel Mytilus edulis

机译：有毒含氨基葡萄球菌亚历山大菌的影响对蓝贻贝贻贝的行为和生理学

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The effects of harmful algae on bivalve physiology are complex and involve both physiological and behavioural responses. Studying those responses is essential to better describe and predict their impact on shellfish aqua culture and health risk for humans. In this study we recorded for two months the physiological response of the blue mussel Mytilus edulis from Eastern Canada to a one-week exposure to a paralytic shellfish poisoning producing dinoflagellate strain of Alexandrium catenella, isolated from the St Lawrence estuary, Canada. Mussels in a 'control' treatment were fed continuously with a non-toxic diet, while mussels in a 'starvation' treatment were fed the same non-toxic diet the first week and subsequently starved for seven weeks. Mussels in a 'toxic' treatment received A. catenella for one week before being starved until the end of the experiment. Over a two month experiment we monitored shell and tissue growth, filtration capacity, respiration rate, byssal attachment strength, valve opening behaviour, and toxin content in tissues. Mussels fed normally on the toxic dinoflagellate and accumulated an average of 51.6 mu g STXeq 100 g(-1) after one week of exposure. After seven weeks of depuration, about half of the specimen showed levels around 18 mu g STXeq 100 g(-1). The condition index of exposed mussels ('toxic' treatment) decreased rapidly from the start as compared to mussels that received a one-week non-toxic diet ('starvation' treatment). Oxygen consumption rates increased in the 'toxic' treatment before leveling out with that of mussels from the 'starvation' treatment. Valve opening amplitude was lower in the 'toxic' treatment during and following the exposure. Average valve closure duration was higher right after the exposure, during the peak of mussel tissue intoxication. No significant change in byssal thread strength was observed through time in each treatment but less force was required to detach mussels from the 'toxic' and 'starvation' treatments. The number of byssus threads produced by mussels exposed to the toxic dinoflagellate was also lower than in the control group. These results represent advancements in our understanding of the impacts of harmful algae on bivalves and contribute to the development of mitigation measures necessary to both the safety of consumers and the sustainability of aquaculture operations.
机译：有害藻类对分枝生理的影响是复杂的，涉及生理和行为反应。研究这些反应对于更好地描述和预测其对人类对贝类养殖和健康风险的影响至关重要。在这项研究中，我们记录了两个月的蓝贻贝·米蒂斯（Edtilus）的生理反应，从加拿大东部到一周的暴露于亚历山大菌的昏迷的亚历山大耳菌菌株，从加拿大圣劳伦斯河口隔离。在“控制”治疗中的贻贝用无毒的饮食连续喂养，而“饥饿”治疗中的贻贝喂食同样的无毒饮食并随后饥饿七周。贻贝在“有毒”治疗中接受了A. Catenella一周前饿死直到实验结束。在两个月的实验中，我们监测组织中的壳和组织生长，过滤能力，呼吸速率，影响力，瓣膜打开行为和毒素含量。贻贝通常在毒性的Dinoflagellate上喂食，并且在接触一周后累积51.6μgstxeq 100g（-1）。经过七周的剩余，约一半的样本显示左右18μm×10g（-1）。与接受一周的无毒饮食的贻贝相比，暴露贻贝的条件指数（“有毒的”治疗）从一开始就迅速下降（'饥饿'治疗）。氧气消耗率在达到“饥饿”治疗中的贻贝之前的“有毒”治疗率增加。阀门打开幅度在曝光期间和之后的“有毒”处理中较低。在贻贝组织中毒的峰值期间，平均阀门闭合持续时间较高。通过每种治疗时间观察到Byssal线程强度的显着变化，但需要减少贻贝从“有毒”和“饥饿”治疗中的少量力量。暴露于毒性Dinoflagelate的贻贝产生的Byssus线的数量也低于对照组。这些结果代表了我们对有害藻类对双抗体影响的影响，并有助于开发消费者安全和水产养殖业务的可持续性所必需的缓解措施。

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