Guillaume Durier, L. Comeau, J. Babarro, Michel Starr, J. Clements, R. Tremblay
{"title":"有毒甲藻亚历山大藻(Alexandrium catenella)对贻贝瓣膜运动的影响:两个具有不同暴露历史的种群之间的比较","authors":"Guillaume Durier, L. Comeau, J. Babarro, Michel Starr, J. Clements, R. Tremblay","doi":"10.3390/coasts3040026","DOIUrl":null,"url":null,"abstract":"Shellfish aquaculture farms, due to their coastal position, face the threat of exposure to harmful algal blooms. Such blooms can release, among others, paralytic shellfish toxins (PST) produced by the dinoflagellate Alexandrium catenella and are known to cause the restriction of bivalve harvesting sites. Shellfish can accumulate PSTs in levels that are poisonous for humans, therefore making them unfit for consumption. Thus, the ability to detect PSTs before they reach the critical threshold is crucial for minimizing losses in the industry. Previous studies have demonstrated that toxic algae detection is possible with the use of an early warning system based on the valve-gaping behaviour of blue mussel Mytilus edulis. However, some studies observed the presence of toxin resistance in other species of bivalves when they are regularly exposed to PSTs. If no resistance is observed whatever the past history of the populations would be with regard to PST exposure, this species could be appropriate as a sentinel candidate. In this study, we compare the valve-gaping behaviour of two blue mussel populations with contrasting long-term histories of PSTs events (i.e., regularly vs. not previously exposed to the PSTs producer) were compared using experimental exposure of A. catenella to M. edulis. It was found that mussels from both populations exhibited similar gaping behaviour patterns when exposed to A. catenella. For both populations, the number of valve closures and closure duration tended to increase in the presence of A. catenella, which suggested an avoidance response to the toxic dinoflagellate. 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In this study, we compare the valve-gaping behaviour of two blue mussel populations with contrasting long-term histories of PSTs events (i.e., regularly vs. not previously exposed to the PSTs producer) were compared using experimental exposure of A. catenella to M. edulis. It was found that mussels from both populations exhibited similar gaping behaviour patterns when exposed to A. catenella. For both populations, the number of valve closures and closure duration tended to increase in the presence of A. catenella, which suggested an avoidance response to the toxic dinoflagellate. 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引用次数: 0
摘要
贝类水产养殖场由于地处沿海,面临着暴露于有害藻华的威胁。藻华会释放由甲藻亚历山大藻(Alexandrium catenella)产生的麻痹性贝类毒素(PST),已知会导致双壳贝类捕捞地点受到限制。贝类积累的 PST 对人体有毒,因此不适合食用。因此,在有毒藻类达到临界阈值之前检测出有毒藻类对减少行业损失至关重要。以往的研究表明,利用蓝贻贝的瓣膜张开行为的预警系统,可以检测出有毒藻类。不过,一些研究观察到,经常接触 PST 的其他双壳类动物也会产生抗药性。如果没有观察到抗药性,无论种群过去暴露于 PST 的历史如何,该物种都可以作为候选哨点。在本研究中,我们利用实验方法将 A. catenella 暴露于 M. edulis,比较了两个蓝贻贝种群的瓣膜整形行为,这两个种群具有截然不同的长期 PSTs 事件历史(即定期暴露于 PSTs 生产者与以前未暴露于 PSTs 生产者)。结果发现,两个种群的贻贝在接触 A. catenella 时表现出相似的裂隙行为模式。对于这两种贻贝种群来说,在卡氏甲藻存在的情况下,瓣膜闭合的次数和闭合持续时间都有增加的趋势,这表明贻贝对有毒甲藻有回避反应。总之,我们的研究结果支持在没有产地歧视的情况下使用M.
Impact of the Toxic Dinoflagellate Alexandrium catenella on the Valve Movement of Mytilus edulis: A Comparison between Two Populations with Contrasting Histories Exposure
Shellfish aquaculture farms, due to their coastal position, face the threat of exposure to harmful algal blooms. Such blooms can release, among others, paralytic shellfish toxins (PST) produced by the dinoflagellate Alexandrium catenella and are known to cause the restriction of bivalve harvesting sites. Shellfish can accumulate PSTs in levels that are poisonous for humans, therefore making them unfit for consumption. Thus, the ability to detect PSTs before they reach the critical threshold is crucial for minimizing losses in the industry. Previous studies have demonstrated that toxic algae detection is possible with the use of an early warning system based on the valve-gaping behaviour of blue mussel Mytilus edulis. However, some studies observed the presence of toxin resistance in other species of bivalves when they are regularly exposed to PSTs. If no resistance is observed whatever the past history of the populations would be with regard to PST exposure, this species could be appropriate as a sentinel candidate. In this study, we compare the valve-gaping behaviour of two blue mussel populations with contrasting long-term histories of PSTs events (i.e., regularly vs. not previously exposed to the PSTs producer) were compared using experimental exposure of A. catenella to M. edulis. It was found that mussels from both populations exhibited similar gaping behaviour patterns when exposed to A. catenella. For both populations, the number of valve closures and closure duration tended to increase in the presence of A. catenella, which suggested an avoidance response to the toxic dinoflagellate. In conclusion, our results support the use of M. edulis without origin discrimination