Radiocaesium accumulation and fluctuating asymmetry in the Japanese mitten crab, Eriocheir japonica, along a gradient of radionuclide contamination at Fukushima.

Radiocaesium accumulation and fluctuating asymmetry in the Japanese mitten crab, Eriocheir japonica, along a gradient of radionuclide contamination at Fukushima.
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日本绒螯蟹(Eriocheir japonica)中放射性铯的积累和波动不对称性,沿着福岛放射性核素污染的梯度。

DOI:
10.1016/j.envpol.2021.118479
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发表时间:
2022
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1987)
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Fuller N
Fuller N
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Fuller N

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2011年东北地震海啸以及随后发生的福岛第一核电站(FDNPS)核事故导致海洋和淡水环境出现大规模放射性核素污染。对福岛地区海洋食品的监测研究普遍表明放射性铯浓度呈下降趋势。然而,对于福岛高度污染地区的淡水生物群,放射性铯的积累和消除以及潜在的生物效应仍然知之甚少。因此,本研究旨在评估放射性铯的积累和对商业上重要的产卵日本绒螯蟹(Eriocheirjaponica.E)的发育影响。 2017 年,我们从距离 FDNPS 4-44 公里的放射性核素污染梯度的四个地点收集了粳稻。为了确定潜在的发育影响,使用波动不对称性 (FA) 作为发育稳定性的衡量标准。整个E的134Cs和137Cs值的组合。来自距离 FDNPS 4 公里和 16 公里的高度污染地点的粳稻湿重分别为 3040 ± 521 和 2250 ± 908 Bq kg−1 湿重,分别比日本标准限值 100 Bq kg−1 高 30 和 22 倍。根据整蟹和沉积物中放射性铯浓度估计的总剂量率范围为 0.016 至 37.7 μGy h−1。放射性铯积累与 FA 之间没有记录到显着关系,这表明福岛的长期辐射暴露不会对大肠杆菌的发育产生影响。粳稻使用波动不对称性进行测量。此外,估计剂量率低于拟议的监管限值,预计会产生重大有害影响。本研究将有助于了解辐射暴露对非人类生物群的长期后果以及放射性污染环境的管理。
The 2011 Tohoku earthquake-tsunami and the subsequent nuclear accident at the Fukushima Dai-ichi Nuclear Power Station (FDNPS) led to large-scale radionuclide contamination of the marine and freshwater environment. Monitoring studies of marine food products in the Fukushima region have generally demonstrated a declining trend in radiocaesium concentrations. However, the accumulation and elimination of radiocaesium and potential biological effects remain poorly understood for freshwater biota inhabiting highly contaminated areas at Fukushima. Consequently, the present study aimed to assess radiocaesium accumulation and developmental effects on the commercially important catadromous Japanese mitten crab,Eriocheirjaponica.E. japonicawere collected from four sites along a gradient of radionuclide contamination 4–44 km in distance from the FDNPS in 2017. To determine potential developmental effects, fluctuating asymmetry (FA) was used as a measure of developmental stability. Combined134Cs and137Cs values for wholeE. japonicafrom highly contaminated sites 4 and 16 km in distance from the FDNPS were 3040 ± 521 and 2250 ± 908 Bq kg−1wet weight respectively, 30 and 22 times greater than the Japanese standard limit of 100 Bq kg−1. Estimated total dose rates based on radiocaesium concentrations in whole crabs and sediment ranged from 0.016 to 37.7 μGy h−1. No significant relationship between radiocaesium accumulation and FA was recorded, suggesting that chronic radiation exposure at Fukushima is not inducing developmental effects inE. japonicaas measured using fluctuating asymmetry.Furthermore, estimated dose rates were below proposed regulatory limits where significant deleterious effects are expected. The present study will aid in the understanding of the long-term consequences of radiation exposure for non-human biota and the management of radioactively contaminated environments.
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