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首页> 外文期刊>Harmful Algae >Can mixtures of cyanotoxins represent a risk to the zooplankton? The case study of Daphnia magna Straus exposed to hepatotoxic and neurotoxic cyanobacterial extracts
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Can mixtures of cyanotoxins represent a risk to the zooplankton? The case study of Daphnia magna Straus exposed to hepatotoxic and neurotoxic cyanobacterial extracts

机译：蓝藻毒素混合物对浮游动物有危险吗？大型蚤（Daphnia magna Straus）暴露于肝毒性和神经毒性的蓝细菌提取物的案例研究

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摘要

Worldwide, cyanobacterial blooms have been increasing in intensity and frequency, with toxic cyanobacteria sometimes dominant throughout the year in many freshwater bodies. Since the coexistence of more than one type of cyanotoxins in freshwater environments is a common phenomenon, studies on the joint effects of these toxins would be very useful. In this study, the single and combined effects of two cyanotoxins with different modes of action (hepatotoxic and neurotoxic) on the survival (lethal exposure) and feeding (sublethal exposure) of the cladoceran Daphnia magna were investigated. With the single exposures, it was observed that both the survival and feeding activity of the daphnids were impaired by the hepatotoxic and neurotoxic extracts at environmentally relevant concentrations. In the combined exposures, both survival and feeding rate endpoints showed a good fit to the independent action model. For the acute assay and 24 h exposure period in the feeding inhibition test, there was no interaction between components of the hepatotoxic and neurotoxic extracts, although a slight tendency to a synergistic deviation could be seen in the feeding rates. On the other hand, for the 4 h post-exposure period, a synergistic deviation was found in feeding rates at all mixture concentrations tested. Hence, the combined exposure of hepatotoxins and neurotoxins should also be taken into account in risk assessments of freshwater bodies, since the mixture of these toxins can result in more severe post-exposure effects on the feeding of daphnids than the sum of those expected for single exposures.
机译：在世界范围内，蓝藻水华的强度和频率不断增加，有毒的蓝藻水全年有时在许多淡水体中占主导地位。由于淡水环境中多种类型的氰毒素共存是一种普遍现象，因此研究这些毒素的联合作用将非常有用。在这项研究中，研究了两种具有不同作用方式（肝毒性和神经毒性）的蓝藻毒素对锁骨Da蚤的存活（致死量）和摄食（亚致死量）的单一和联合作用。通过单次暴露，可以观察到在环境相关浓度的肝毒性和神经毒性提取物会损害水蚤的存活和进食活性。在综合暴露中，存活率和摄食率终点均显示出与独立行为模型的良好契合。对于进食抑制试验中的急性试验和24小时暴露期，尽管在进食速度上可以看到轻微的协同偏离趋势，但肝毒性和神经毒性提取物的成分之间没有相互作用。另一方面，在暴露后4小时内，在所有测试的混合物浓度下，进料速度均出现了协同偏差。因此，在淡水水体的风险评估中，还应考虑肝毒素和神经毒素的联合暴露，因为这些毒素的混合物对水蚤的摄食后的影响比单次预期的总和更为严重。曝光。

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  • 来源
    《Harmful Algae》 |2014年第1期|143-152|共10页
  • 作者

    Emanuela Cristina Freitas; Carlos Pinheiro; Odete Rocha; Susana Loureiro;

  • 作者单位

    Department of Ecology and Evolutionary Biology, Federal University of Sao Carlos, Rodovia Washington Luis, km 235, CEP 13565-905 Sao Carlos, SP, Brazil;

    Department of Biology and Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal;

    Department of Ecology and Evolutionary Biology, Federal University of Sao Carlos, Rodovia Washington Luis, km 235, CEP 73565-905 Sao Carlos, SP, Brazil;

    Department of Biology and Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal;

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  • 正文语种 eng
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  • 关键词

    Anatoxin-a(s); Binary mixtures; Cyanobacterial extracts; Daphnia magna; Microcystin-LR; Synergism;

    机译：Anatoxin-a（s）;二元混合物蓝藻提取物;水蚤微囊藻毒素-LR;协同作用;

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