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首页> 外文期刊>Marine ecology progress series >Lack of accumulation of paralytic shellfish poisoning (PSP) toxins in the tintinnid ciliate Favella taraikaensis feeding on the toxic dinoflagellate Alexandrium tamarense
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Lack of accumulation of paralytic shellfish poisoning (PSP) toxins in the tintinnid ciliate Favella taraikaensis feeding on the toxic dinoflagellate Alexandrium tamarense

机译：以有毒的鞭毛鞭毛亚历山大藻为食的丁香纤毛虫Taraikaensis缺乏麻痹性贝类中毒（PSP）毒素积累

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摘要

To clarify the fate of paralytic shellfish poisoning (PSP) toxins in planktonic food webs, toxin contents of the planktonic ciliate Favella taraikaensis feeding on Alexandrium tamarense and of the surrounding seawater were examined in laboratory experiments using high-performance liquid chromatography fluorometric detection. During 5 or 6 d incubation periods in 3 replicate experiments, F. taraikaensis actively ingested A. tamarense and reached 8 to 17-fold initial density values. At the end of the incubation, the toxin concentration of the suspension consisting mostly of F. taraikaensis, which had increased by feeding on A. tamarense, was much lower than that of A. tamarense cells. The toxin content of pure F. taraikaensis, which was analyzed based on 165 to 200 individuals of F. taraikaensis directly taken from the suspension, was also lower than the cellular tox-icity of A. tamarense. Toxin concentration in filtrates of the F. taraikaensis suspension was significantly higher than that in filtrates of the suspension containing only A. tamarense. Furthermore, the total toxin concentration in the F. taraikaensis suspension (particulates plus the filtrate) was almost equivalent to that in the A. tamarense suspension in each trial. We conclude that the PSP toxins of A. tamarense are not accumulated in F. taraikaensis over 24 h in the course of predator-prey interactions, and the toxins are rapidly excreted from the cell body of the ciliate.
机译：为了弄清浮游食物网中的麻痹性贝类中毒（PSP）毒素的命运，在实验室实验中使用高效液相色谱荧光检测法检测了以塔玛亚历山大藻为食的浮游纤毛虫Favella taraikaensis和周围海水的毒素含量。在3个重复实验中的5或6 d潜伏期中，taraikaensis主动摄取了tamarense A. tamarense，并达到8至17倍的初始密度值。孵育结束时，主要由塔拉卡斯藻构成的悬浮液的毒素浓度比通过饲养它而增加了，但其浓度却远低于塔玛菌细胞。根据直接从悬浮液中提取的165至200个人的taraikaensis F.分析纯taraikaensis的毒素含量也低于A. tamarense的细胞毒性。 taraikaensis悬浮液滤液中的毒素浓度明显高于仅含tamarense的悬浮液滤液中的毒素浓度。此外，在每个试验中，taraikaensis悬浮液（颗粒加滤液）中的总毒素浓度几乎等于tamarense悬浮液中的总毒素浓度。我们得出结论，在捕食者与猎物相互作用的过程中，tamarense的PSP毒素在24 h内不会在F. taraikaensis中积累，并且毒素从纤毛虫的细胞体中迅速排出。

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