Combined effect of temperature and nutritional regime on the elimination of the lipophilic toxin okadaic acid in the naturally contaminated wedge shell Donax trunculus
Combined effect of temperature and nutritional regime on the elimination of the lipophilic toxin okadaic acid in the naturally contaminated wedge shell Donax trunculus
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DOI：
10.1016/j.chemosphere.2017.09.100
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发表时间：
2018-01-01
期刊：
影响因子：
8.8
通讯作者：
Matias, Domitilia
中科院分区：
文献类型：
--
作者：
Botelho, Maria Joao;Vale, Carlos;Matias, Domitilia
在16 ℃和20 ℃条件下，将天然污染的尖吻对虾（Donax trunculus）暴露于3种营养状态（微藻、商业微藻膏和饥饿）中14 d，研究了营养状态和水温对尖吻对虾（Donax trunculus）OA类毒素净化率的影响。在第2、4、6、8、10、12和14天收集的个体的整个软组织中定量总OA。调查了死亡率、干重、状态指数、总生化组成和配子发生阶段。实验期间糖原和碳水化合物的低变化表明楔形壳体处于非剧烈应力条件下。楔形壳喂无毒的饮食表现出类似的净化率分别为15和38%，高于饥饿，在16和20摄氏度，分别。在20摄氏度无毒饮食下的净化率比16摄氏度高71%。这些结果突出了水温对D.在葡萄牙南部沿海沃茨，通常在一周的时间尺度上观察到的情况下，即使只有4摄氏度的增加，也会对trunculus产生不利影响。这些结果打开了一个更快的释放OA在收获的楔形壳易位到净化系统时，在水温略有增加的可能性。(C)2017由Elsevier Ltd.出版
The influence of nutritional regime and water temperature on depuration rates of OA-group toxins in the wedge shell Donax trunculus was examined by exposing naturally contaminated specimens to three nutritional regimes (microalgae, commercial paste of microalgae, and starvation) for 14 days at 16 degrees C and 20 degrees C. Total OA was quantified in the whole soft tissues of the individuals collected in days 2, 4, 6, 8, 10, 12 and 14. Mortality, dry weight, condition index, gross biochemical composition and gametogenic stages were surveyed. Low variation of glycogen and carbohydrates during the experiments suggest that wedge shells were under non-dramatic stress conditions. Wedge shells fed with non-toxic diets showed similar depuration rates being 15 and 38% higher than in starvation, at 16 and 20 degrees C, respectively. Depuration rates under non-toxic diets at 20 degrees C were 71% higher than at 16 degrees C. These results highlight the influence of water temperature on the depuration rate of total OA accumulated by D. trunculus, even when the increase is of only 4 degrees C, as commonly observed in week time scales in the southern Portuguese coastal waters. These results open the possibility of a faster release of OA in harvested wedge shells translocated to depuration systems when under a slight increase of water temperature. (C) 2017 Published by Elsevier Ltd.