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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >The Combined Effects of Zinc and Alga on the Life Table Demography of Anuraeopsis fissa and Brachionus rubens (Rotifera)
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The Combined Effects of Zinc and Alga on the Life Table Demography of Anuraeopsis fissa and Brachionus rubens (Rotifera)

机译：锌和藻类联合作用对无瓣拟南芥和红景天的生命表人口的影响

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摘要

In this work the combined effects of zinc and Chlorella on the demography of two co-occurring planktonic rotifers (A. fissa and B. rubens) were evaluated. Chlorella absorbed a significant (about 35%) quantity of zinc from the medium within the 24 h period. The age-specific survivorship curves of A. fissa and B. rubens showed increased mortality rate with increasing zinc concentration in the medium (0 to 0.5 mg L~(-1)), at the two Chlorella levels (0.5 x 10~6 and 1.0 x 10~6 cells mL~(-1)). In controls, both the rotifer species showed enhanced survival at higher food level (1.0 x 10~6 cells mL~(-1)). Low food level (0.5 x 10~6 cells mL~(-1)) and higher concentration (0.25 and 0.5 mg L~(-1)) of zinc resulted in a steep fall in the survivorship. Regardless of Zn concentration and food level, A. fissa had a shorter average lifespan, lower gross and net reproductive rate, and rate of population increase than B. rubens. The maximum offspring production on a given day in controls for A. fissa was about 2 female~(-1), which was reduced to half when exposed to 0.5 mg L~(-1) of Zn. At both food levels, A. fissa exposed to Zn at 0.5 mg L~(-1) had negative population growth rates. The highest population growth rate (0.94 day~(-1)) was observed for B. rubens in controls at 1.0 x 10~6 cell mL~(-1) of Chlorella. The present data showed that A. fissa was more sensitive to zinc toxicity than B. rubens. Combination of high vulnerability to metal toxicity and low population growth rate, A. fissa in zinc contaminated waterbodies could be possibly more adversely affected than B. rubens.
机译：在这项工作中，评估了锌和小球藻对两种同时出现的浮游性轮虫（A. fissa和B. rubens）的人口统计学的影响。在24小时内，小球藻从培养基中吸收了大量（约35％）的锌。在两个小球藻水平（0.5 x 10〜6和0）下，随着培养基中锌浓度的增加（0至0.5 mg L〜（-1）），A。fissa和B. rubens的年龄特异性存活曲线显示死亡率增加。 1.0 x 10〜6细胞mL〜（-1））。在对照组中，两种轮虫在较高的食物水平（1.0 x 10〜6细胞mL〜（-1））下均显示出更高的存活率。较低的食物水平（0.5 x 10〜6细胞mL〜（-1））和较高的锌浓度（0.25和0.5 mg L〜（-1））导致存活率急剧下降。不论锌的浓度和食物水平如何，fissa A. fissa的平均寿命都比B. rubens短，总生殖和净生殖率较低，而人口增长率却高于B. rubens。对照中给定一天的最大产量为大约2雌性（-1），当暴露于0.5 mg L〜（-1）的Zn时减少到一半。在两种食物水平下，暴露于0.5 mg L〜（-1）的锌的沙曲菌种群增长率均为负值。在小球藻1.0 x 10〜6细胞mL〜（-1）的对照中，红景天的种群增长率最高（0.94天〜（-1））。目前的数据表明，比起红景天，A。fissa对锌的毒性更敏感。金属毒性高脆弱性和低种群增长率的结合，受锌污染的水体中的拟南芥可能比鲁本氏杆菌受到更不利的影响。

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