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首页> 外文期刊>Turkish journal of zoology >Relative tolerance of some tropical freshwater microcrustaceans to acidification
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Relative tolerance of some tropical freshwater microcrustaceans to acidification

机译：一些热带淡水甲壳动物对酸化的相对耐受性

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摘要

The present work reports on the effects of low pH values on the mortality of 3 freshwater zooplankton available in the freshwater ponds of Midnapore district. Acute bioassay tests on Daphnia lumholtzi, Moina brachiata, and Heliodiaptomus viduus to varying acidic pH levels of water were performed in the laboratory using serial grades of hydrochloric acid solution. Among the 3 genera, M. brachiata was found to respond sharply to acid stress in a 1-h assay, since 100% mortality was achieved at pH 5.79 (2.347 mM HCl), as compared to H. viduus, which showed 100% death in 1 h only below pH 4.9 (2.978 mM HCl). In fact, it appears that H. viduus is more tolerant to short-term acidification than M. brachiata after a 1-h exposure. This study determined that adult M. brachiata had the lowest Lc_(50) values and H. viduus had the highest Lc_(50) values at both 1 h and 24 h. The survival pattern of D. lumholtzi closely resembled that of H. viduus rather than M. brachiata. Higher sensitivity of M. brachiata, even to the slightest alteration of pH as revealed by chi-square tests (significant differences with others), has prompted us to consider this species as a sensitive indicator of aquatic pollution, particularly acidification.
机译：本工作报告了低pH值对Midnapore地区淡水池塘中3种淡水浮游动物死亡率的影响。在实验室中，使用连续等级的盐酸溶液对水蚤（Daphnia lumholtzi），腕带莫伊纳（Moina brachiata）和维氏螺旋藻（Heliodiaptomus viduus）进行了急性生物测定测试，以改变水的酸性pH值。在这3个属中，由于在pH值为5.79（2.347 mM HCl）下达到100％的死亡率，而在Vi.us上显示为100％的死亡，因此在1小时的试验中发现腕带分枝杆菌对酸胁迫具有强烈的响应。仅在低于pH 4.9（2.978 mM HCl）的情况下在1小时内。实际上，暴露1 h后，似乎Vi。viduus对短时酸化的耐受性强于brachiata。这项研究确定，成年臂状支原体在1 h和24 h的Lc_（50）值最低，而Vi.tus的Hc_（50）值最高。 D. lumholtzi的生存模式与H. viduus非常相似，而不是Brachiata。腕带分枝杆菌的更高敏感性，甚至对卡方检验所揭示的pH值的最小改变（与其他差异显着），促使我们将这一物种视为对水体污染特别是酸化的敏感指标。

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