The effects of Copper and Zinc on survival, growth and reproduction of the cladoceran Daphnia longispina: introducing new data in an “old” issue
The effects of Copper and Zinc on survival, growth and reproduction of the cladoceran Daphnia longispina: introducing new data in an “old” issue
复制标题
铜和锌对枝角水蚤生存、生长和繁殖的影响：在“旧”问题中引入新数据
DOI：
10.1007/s10646-017-1841-0
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发表时间：
2017
期刊：
影响因子：
2.7
通讯作者：
A. Nogueira
中科院分区：
文献类型：
--
作者：
C. Martins;Fátima Jesus;A. Nogueira
由于金属的持续沉积和持久性，金属污染仍然是一个主要的环境问题。在这项工作中，我们打算评估铜(铜)和锌(锌)对淡水环境中常见的枝角类大型水蚤生活史参数的影响。为此，我们研究了铜(20-300 微克/L)和锌(500-4000 微克/L)对长鳍金鱼存活、生长、繁殖、摄食率和种群增长率的影响。虽然每种金属的最高浓度只会降低存活率，但其他终点会受到较低浓度的强烈影响。生长受到两种金属的影响，特别是在0-7d期间，以铜 ≥ 40 /L和锌 ≥ 500 /L最为显著。事实上，第7天的生长终点(体长和生长速率)与第21天的相应终点一样敏感或更敏感。第一次繁殖时的大小减小(显著的是铜 ≥ 40 /L和锌 ≥ 500 /L)。繁殖力下降，部分原因是生长速度减慢，但金属对生殖的直接影响(基于体长-仔鱼大小的关系)支持了额外的影响。生长和繁殖的减少可能是由于金属引起的取食抑制而引起的食物中介效应。在全球范围内，铜和锌对研究终点的影响不同，支持了这种影响的化学特异性，锌引起的影响比铜更明显。这项工作提出了一种创新的方法来研究铜和锌对长柄藻的影响，给出了这些影响的一般和全面的概述。
Metal contamination is still a major environmental issue due to their continuous deposition and persistence. In this work we intended to assess the impact that Copper (Cu) and Zinc (Zn) exert in life-history parameters of Daphnia longispina, a common cladoceran in freshwater environments. Thus, we studied the effects of Cu (20–300 µg/L) and Zn (500–4000 µg/L) on the survival, growth, reproduction, feeding rate and population growth rate of D. longispina. Though survival was only reduced for the highest concentration of each metal, other endpoints were strongly affected by lower concentrations. Growth was affected by both metals, especially in the period 0–7 d, being significant for Cu ≥ 40 µg/L and Zn ≥ 500 µg/L. Indeed, growth endpoints at day 7 (body length and growth rate) were equally or more sensitive than the corresponding endpoints at day 21. The size at first reproduction decreased (significant for Cu ≥ 40 µg/L and Zn ≥ 500 µg/L). Reproduction decreased, which was partially explained by the reduced growth, but additional effects were supported by a direct effect of metals on reproduction (based on the relationship body length-brood size). Reduced growth and reproduction are likely a food mediated effect due to feeding inhibition caused by the metals. Globally, the studied endpoints were affected by Cu and Zn differently, supporting a chemical-specificity of the effects, with Zn causing more pronounced effects than Cu. This work presents an innovative approach to the effects of Cu and Zn to D. longispina, giving a general and comprehensive overview of those effects.