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首页> 外文期刊>Journal of Environmental Science and Health >Effect of cadmium and zinc on the population growth of Brachionus havanaensis (Rotifera: Brachionidae)
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Effect of cadmium and zinc on the population growth of Brachionus havanaensis (Rotifera: Brachionidae)

机译：镉和锌对哈瓦那弧菌种群生长的影响（轮虫：Brachionidae）

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摘要

We evaluated the effect of 3 sublethal concentrations of Cd (as CdCl_2, 209.50, 104.75 and 52.38 μg/L) and Zn (as ZnCl_2, 283.88, 141.94 and 70.97 μg/L) separately and together on the population growth of the common Mexican brachionid rotifer Brachionus havanaensis using 1 × 10~6 cells/mL of Chlorella vulgaris as the algal diet. The LC50 (24-h bioassay conducted in the absence of food) for B. havanaensis was 419.0 ± 8.1 μg/L for Cd and 2271.0 ± 404.4 μg/L for Zn. The effect of different concentrations of Cd or Zn on the population growth of B. havanaensis showed decreased population abundance with increasing levels of the metal concentration in the medium. However, for Cd even at the highest tested concentration (i.e., 50% LC_(50), 209.5 μg/L), there was some increase in the abundance of B. havanaensis, although much lower than in controls. On the other hand, for Zn at highest tested concentration (i.e., 12.5% LC50, 283.88 μg/L), the population of B. havanaensis showed little growth and remained close to the initial density. Under the conditions of mixed metal exposure, B. havanaensis did not grow at the highest tested concentrations of Cd+Zn combination. The rate of population increase (r) varied from 0.11 to 0.43 per day, depending on the heavy metal concentration. Statistically r was adversely influenced by the heavy metal concentration in the medium. Tests of multiple comparisons indicated that rat the lowest level of Cd or Zn (alone or mixed) was not significantly different from controls. Our data from the acute toxicity tests showed that Cd was 5 times more toxic than Zn to B. havanaensis but this difference was much reduced based on the chronic toxicity studies.
机译：我们分别评估了3个亚致死浓度的Cd（分别为CdCl_2、209.50、104.75和52.38μg/ L）和Zn（分别为ZnCl_2、283.88、141.94和70.97μg/ L）对常见墨西哥bra的种群增长的影响。轮虫Brachionus havanaensis以1×10〜6细胞/ mL的小球藻作为藻类饮食。哈瓦那芽孢杆菌的LC50（无食物24小时生物测定）对于Cd为419.0±8.1μg/ L，对于Zn为2271.0±404.4μg/ L。不同浓度的Cd或Zn对B. havanaensis种群增长的影响表明，随着培养基中金属浓度的增加，种群数量减少。然而，即使在最高测试浓度（即50％LC_（50），209.5μg/ L）下，镉也能使哈瓦那芽孢杆菌的丰度有所增加，尽管远低于对照。另一方面，对于最高测试浓度（即12.5％的LC50，283.88μg/ L）的锌，哈瓦那芽孢杆菌的种群几乎没有生长，并保持接近初始密度。在混合金属暴露的条件下，哈瓦那芽孢杆菌在Cd + Zn组合的最高测试浓度下不会生长。每天的人口增长率（r）从0.11到0.43不等，具体取决于重金属的浓度。统计上，r受介质中重金属浓度的不利影响。多次比较的测试表明，大鼠最低的Cd或Zn水平（单独或混合）与对照组无显着差异。我们从急性毒性试验获得的数据表明，镉对哈瓦那芽孢杆菌的毒性比锌高5倍，但根据慢性毒性研究，这种差异已大大减少。

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