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首页> 外文期刊>Fish & Shellfish Immunology >Heavy metals affect the circulating haemocyte number in the shrimpPalaemon elegans
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Heavy metals affect the circulating haemocyte number in the shrimpPalaemon elegans

机译：重金属影响虾中循环血细胞的数量

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Environmental contamination by heavy metals produced by either anthropogenic or natural activities represents a threat to many species of aquatic animals worldwide. This study investigates the effect of short-term (96 h) exposure to dissolved heavy metals on the number of circulating haemocytes in the shrimp, Palaemon elegans (Rathke). Changes in haemocyte counts were determined in relation to time of exposure and with heavy metal concentration, relating the results to toxicity. It was found that immersion in artificial seawater containing Hg, Cd, Cu, Cr, Zn or Pb caused a decrease in the haemocyte count during the first 8 h exposure, although the haemocyte number returned to the initial (time 0) levels over the following 16 h immersion. In each case, the decrease in circulating haemocyte count induced by these metals was significantly different from the controls. The greatest decrease in haemocyte numbers (haemocytopenia) was induced by Pb, followed, in descending order, by Zn, Hg, Cr, Cu and Cd. The lethal level of haemocytopenia for the shrimps, defined as the number of haemocytes ml(-1) remaining in moribund animals (i.e. threshold of mortality) was found to be significantly lower than the levels tolerated by surviving shrimps (i.e. the limit of survival). The percentage of haemocytes remaining in the circulation at the threshold of mortality as a function of the number at time 0 was 56.6 +/- 8.8%. By contrast, the equivalent value for the threshold of survival was 63.7 +/- 12.4%. Importantly, the percentage decrease in haemocyte counts tolerated by P. elegans appears to vary with the metal. Animals treated with Ph or Zn survived with a lower number of circulating haemocytes than animals exposed to the other heavy metals.
机译：人为或自然活动产生的重金属对环境的污染对全世界许多水生动物物种构成威胁。这项研究调查了短期（96小时）暴露于溶解的重金属对虾线虫（Rathke）中循环血细胞数量的影响。确定血细胞计数的变化与暴露时间和重金属浓度的关系，并将结果与​​毒性联系起来。发现在暴露于Hg，Cd，Cu，Cr，Zn或Pb的人造海水中时，尽管在随后的8小时内血细胞数恢复到初始（时间0）水平，但导致血细胞数减少。浸泡16小时。在每种情况下，由这些金属引起的循环血细胞计数的减少与对照明显不同。血铅数量（血细胞减少症）的最大减少是由铅引起的，其次是锌，汞，铬，铜和镉。虾的血细胞减少症的致死水平（定义为垂死动物中剩余的血细胞数量ml（-1）（即死亡阈值））显着低于存活虾所能忍受的水平（即生存极限） 。死亡阈值处循环中剩余的血细胞百分率是时间0处的数量的函数，为56.6 +/- 8.8％。相比之下，生存阈值的等效值为63.7 +/- 12.4％。重要的是，秀丽隐杆线虫耐受的血细胞计数的百分比降低似乎随金属而变化。与暴露于其他重金属的动物相比，用Ph或Zn处理的动物存活的循环血细胞数量更少。

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