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首页> 外文期刊>Journal of Environmental Science and Health >Comparative population growth of Ceriodaphnia dubia and Daphnia pulex (Cladocera) exposed to zinc toxicity
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Comparative population growth of Ceriodaphnia dubia and Daphnia pulex (Cladocera) exposed to zinc toxicity

机译：暴露于锌中毒的杜鹃花和水蚤（Cladocera）的种群增长比较

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摘要

Population growth of two cladocerans (Ceriodaphnia dubia and Daphnia pulex) exposed to 4 different concentrations of ZnCl_2 (0.125, 0.25,0.5 and 1.0 mg L~(-1), plus controls) at one algal food (Scenedesmus acutus) density (0.5×10~6 cells mL~(-1)) was quantified for 30 days. Population densities of C. dubia and D. pulex decreased with increasing concentration of Zn in the medium. At a concentration of 1 mg L~(-1) of ZnCl_2, both C. dubia and D. pulex did not reproduce and died within a week. The peak population densities of C. dubia ranged from 0.2 to 6.0 ind. mL~(-1), depending on the Zn level in the medium, whereas this range was lower for D. pulex (0.2 to 4.1 ind. mL~(-1)). The peak population density was inversely related to the Zn concentration. The rate of population increase (r) varied from -0.12 to +0.14 and -0.02 to +0.23 per day for C. dubia and D. pulex, respectively, depending on the Zn level in the medium. Statistically, both the peak population density and the r were significantly affected by the heavy metal concentration in the medium. Multiple comparison tests showed that the rate of population increase (r) of D. pulex in the lowest ZnCl_2 level (0.125 mg L~(-1)) was significantly higher than controls. However, under similar conditions, the r of C. dubia was significantly lower than controls. With a further increase in Zn level, the growth rates of both the cladoceran species were significantly reduced as compared to controls. The results are discussed in relation to published data on the toxicity of zinc to freshwater zooplankton.
机译：在一种藻类食物（Scenedesmus acutus）密度下（0.5×定量10〜6个细胞mL〜（-1）30天。随着培养基中Zn浓度的增加，C。dubia和D. pulex的种群密度降低。当浓度为1 mg L〜（-1）的ZnCl_2时，杜氏梭状芽胞杆菌和杜氏梭状芽胞杆菌均未繁殖并在一周内死亡。 C. dubia的最高种群密度在0.2到6.0 ind之间。 mL〜（-1），取决于培养基中的Zn含量，而D. pulex的该范围较低（0.2到4.1 ind。mL〜（-1））。峰值种群密度与锌浓度成反比。硬皮梭状芽孢杆菌和粉刺梭菌的种群增长率（r）分别为每天-0.12至+0.14和-0.02至+0.23，具体取决于培养基中的锌水平。从统计学上讲，峰值人口密度和r都受到培养基中重金属浓度的显着影响。多重比较试验表明，最低ZnCl_2水平（0.125 mg L〜（-1））中的D. pulex种群增加率（r）明显高于对照组。然而，在相似的条件下，杜仲梭菌的r明显低于对照。随着锌水平的进一步提高，与对照相比，两种枝角类物种的生长速率均显着降低。结合公开的锌对淡水浮游动物毒性的数据讨论了结果。

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    JONATHAN RAUL SANCHEZ-ORTIZ; S.S.S. SARMA; S. NANDINI;

  • 作者单位

    Laboratory of Aquatic Zoology, National Autonomous University of Mexico, Campus Iztacala, Mexico;

    Laboratory of Aquatic Zoology, Building U.M.F., Division of Research and Postgraduate Studies, National Autonomous University of Mexico, Campus Iztacala, A. P. 314, C. P. 54000, Los Reyes, Tlalnepantla, State of Mexico, Mexico;

    UIICSE, National Autonomous University of Mexico, Campus Iztacala, Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heavy metal; zooplankton; population dynamics; chronic toxicity;

    机译：重金属;浮游动物人口动态;慢性中毒;

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