Does Chernobyl-derived radiation impact the developmental stability of Asellus aquaticus 30years on?
Does Chernobyl-derived radiation impact the developmental stability of Asellus aquaticus 30years on?
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切尔诺贝利辐射是否会影响水生鱼30年后的发育稳定性？
DOI：
10.1016/j.scitotenv.2016.10.097
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Fuller N
中科院分区：
文献类型：
--
作者：
Fuller N
由于缺乏对长期暴露于受污染环境后的研究，与环境相关的长期辐射剂量对生物群的影响仍不清楚。1986年的切尔诺贝利核事故将大量的放射性物质散布到环境中，这种情况至今仍在持续。尽管经过三十年的研究，该事件对非人类生物体的影响在科学文献中仍然存在争议。本研究评估了切尔诺贝利慢性辐射暴露对模式水生等足类动物Asellus aquaticususing波动不对称性（FA）作为指标的发展稳定性的影响。波动不对称性，定义为生物体预期的完美双侧对称性的随机偏差，已成为生态毒理学中发育稳定性的一个指标。生物收集六湖沿着梯度的放射性核素污染在白俄罗斯和乌克兰。计算的总剂量率范围为0.06-27.1 μ戈伊/h。波动的不对称性进行了评估，在四个meristic和一个度量性状。在合并的不对称性水平的显着差异，独立的性别和特定的测量性状的样本网站之间的记录。然而，不对称性与辐射剂量没有相关性，这表明不对称性的差异并不归因于放射性核素污染，而是由单个站点的不对称性升高所驱动。FA和测量的环境参数之间没有相关性，表明生物因素驱动观察到FA差异。这项研究似乎是第一次记录切尔诺贝利地区生物群的发育稳定性没有明显增加。这些发现将有助于了解生物体对慢性污染物暴露的反应以及切尔诺贝利和福岛等大规模核事件的长期影响。
Effects of long-term, environmentally relevant doses of radiation on biota remain unclear due to a lack of studies following chronic exposure in contaminated environments. The 1986 Chernobyl accident dispersed vast amounts of radioactivity into the environment which persists to date. Despite three decades of research, impacts of the incident on non-human organisms continues to be contested within the scientific literature. The present study assessed the impact of chronic radiation exposure from Chernobyl on the developmental stability of the model aquatic isopod,Asellus aquaticususing fluctuating asymmetry (FA) as an indicator. Fluctuating asymmetry, defined as random deviations from the expected perfect bilateral symmetry of an organism, has gained prominence as an indicator of developmental stability in ecotoxicology. Organisms were collected from six lakes along a gradient of radionuclide contamination in Belarus and the Ukraine. Calculated total dose rates ranged from 0.06–27.1 μGy/h. Fluctuating asymmetry was assessed in four meristic and one metrical trait. Significant differences in levels of pooled asymmetry were recorded between sample sites independent of sex and specific trait measured. However, there was no correlation of asymmetry with radiation doses, suggesting that differences in asymmetry were not attributed to radionuclide contamination and were driven by elevated asymmetry at a single site. No correlation between FA and measured environmental parameters suggested a biotic factor driving observed FA differences. This study appears to be the first to record no evident increase in developmental stability of biota from the Chernobyl region. These findings will aid in understanding the response of organisms to chronic pollutant exposure and the long term effects of large scale nuclear incidents such as Chernobyl and Fukushima.
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