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首页> 外文期刊>Environmental toxicology and chemistry >REPRODUCTIVE TOXICITY OF DIETARY COPPER TO A SALTWATER CLADOCERAN, MOINA MONOGOLICA DADAY
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REPRODUCTIVE TOXICITY OF DIETARY COPPER TO A SALTWATER CLADOCERAN, MOINA MONOGOLICA DADAY

机译：食用铜对MOINAGOLICA DADAY食盐螯虾的生殖毒性

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In the present study, the chronic toxicity of dietary copper to Moina monogolica Daday was investigated. Microalgal growth inhibition tests were conducted for 96 h with the green algae Chlorella pyrenoidosa exposed to copper. The 96-h median effective concentration (95% confidence interval) was 509.12 (388.68-629.56) μg/L. Then, C. pyrenoidosa was exposed for 96 h to a control and to seven dissolved copper concentrations. Cellular copper concentration accumulated in a dose-dependent manner and was plotted against cell density. These algae were used as food in a 21 -d bioassay with M. monogolica in seawater to which no dissolved copper was added. Brood size was not reduced in the first brood, but significant reductions at all algal-exposure copper concentrations (44.78-817.17 μg/L) were observed in all subsequent broods, with increasing magnitude in each brood. Neither longevity nor number of broods per female was significantly affected, even at the highest copper exposure, though both endpoints did show a consistent downward trend with increasing copper exposure. Total reproduction, brood size, and net reproductive rate were decreased significantly in all dietary copper exposures (algae exposed to 44.78-817.17 μg/L). In contrast, the intrinsic rate of natural increase was reduced significantly only with algae exposed to greater than 619.27 μg/L, most likely because of the heavy influence of early reproduction on this metric. Because cell density in algal cultures decreased with increasing copper concentrations, it is possible that changes in the nutritional content of the algal diet could have played a role in causing the observed changes in reproduction of M. monogolica.
机译：在本研究中，研究了日粮铜对莫伊果夜蛾的慢性毒性。在绿藻小球藻小球藻暴露于铜的情况下进行了96小时的微藻生长抑制测试。 96小时中位有效浓度（95％置信区间）为509.12（388.68-629.56）μg/ L。然后，将吡虫假单胞菌暴露于对照和六种浓度的铜中96小时。细胞铜浓度以剂量依赖性方式累积，并针对细胞密度作图。这些藻类在21 d生物测定中被用作食品，在海水中使用了Mongolica M.，没有添加溶解的铜。在第一个繁殖箱中，繁殖箱的大小没有减少，但是在所有随后的繁殖箱中，所有藻类暴露的铜浓度（44.78-817.17μg/ L）都显着降低，每个繁殖箱中的大小都增加。即使在最高铜暴露水平下，寿命或每位女性的育雏数量也没有受到显着影响，尽管两个终点均显示出随着铜暴露水平的增加而出现的持续下降趋势。在所有膳食铜暴露（藻类暴露于44.78-817.17μg/ L）中，总生殖，育雏量和净繁殖率均显着降低。相反，仅当藻类暴露于619.27μg/ L以上时，自然增加的内在速率才显着降低，这很可能是由于早期繁殖对该指标的严重影响。因为随着铜浓度的增加，藻类培养物中的细胞密度会降低，所以藻类饮食中营养成分的变化可能在导致所观察到的莫桑比克分支杆菌繁殖变化中发挥了作用。

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