Using the larvae of caddisfly as a biomonitor to assess the spatial distribution and effective half-life of radiocesium in riverine environments in Fukushima, Japan
Using the larvae of caddisfly as a biomonitor to assess the spatial distribution and effective half-life of radiocesium in riverine environments in Fukushima, Japan
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DOI：
10.1016/j.physo.2021.100060
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发表时间：
2021-02
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通讯作者：
Y. Matsuo;Kunihiko Nakai;Nozomi Tatsuta;O. Inanami;Kumiko Yamamoto;H. Mizukawa;H. Nagasaka;F. Mizutani;Youichi Chisaki;Toshiki Aiba;Takashi Ohba;I. Watanabe;H. Nabeshi;Taiki Higuchi;Y. Koga;Hideaki Matsumoto;Kou Nishimuta;Hideki Miyamoto;Tomokazu Haraguchi;N. Ryuda;D. Ueno
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作者：
Y. Matsuo;Kunihiko Nakai;Nozomi Tatsuta;O. Inanami;Kumiko Yamamoto;H. Mizukawa;H. Nagasaka;F. Mizutani;Youichi Chisaki;Toshiki Aiba;Takashi Ohba;I. Watanabe;H. Nabeshi;Taiki Higuchi;Y. Koga;Hideaki Matsumoto;Kou Nishimuta;Hideki Miyamoto;Tomokazu Haraguchi;N. Ryuda;D. Ueno
利用这种生物的环境监测调查被称为“石蚕蛾观察”，这项活动涉及科学家和当地居民收集它们。需要一种简单的方法来连续监测2011年日本福岛第一核电站（FDNPP）事故后河流环境中的放射性铯（137 Cs）污染。在一个名为“石蛾观察”的项目中，我们利用石蛾Stenopsychemarmorata（毛翅目：狭蛾科）的幼虫来监测河流环境中137 Cs污染的空间分布和估算有效半衰期（Teff）。石蚕蛾幼虫体内137 Cs浓度在几种水生生物中最高，各生长阶段间无明显差异。此外，石蛾幼虫消化道悬浮颗粒物中137 Cs的浓度反映了其体内的137 Cs浓度，且无季节变化，重现性较好，与沉积物中的137 Cs浓度相关性较好。结果表明，石蛾幼虫可作为悬浮颗粒物的生物采样器。用单组分衰变函数模型估算的石蛾幼虫体内~（137）Cs浓度的T_（eff）值拟合显著。Kuma、Maeda、Niida下游、Niida上游、Ohkawa和Ukedo河的Teff值分别为2.8、5.7、3.1、6.7、0.6和4.8年（34、68、38、80、6.9和58个月）。本研究中的下降趋势的结果类似于以前报道的福岛。使用这种简单的“石蛾观察”方法进行进一步的连续观察，可以预测河流环境中放射性铯污染的未来。
The environmental monitoring survey using this organisms was called “Caddisfly Watch” and this activity has involved both scientists and local people for collecting them.A simple method is needed for the continuous monitoring of radiocesium (137Cs) contamination in riverine environments after the 2011 accident at the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in Japan. In a program called “Caddisfly Watch”, we used larvae of the caddisflyStenopsyche marmorata(Trichoptera: Stenopsychidae) to monitor the spatial distribution and estimate effective half-life (Teff) of137Cs pollution in riverine environments. Caddisfly larvae showed that the highest concentration of137Cs among several aquatic organisms and no apparent variation between growth stage. In addition, caddisfly larvae reflected137Cs concentrations in suspended particulate matter in their gut, and that showed no seasonal variation, better reproducibility, and significant correlation with those in sediment. Results indicate that caddisfly larvae can be used as a biological sampler of suspended particulate matters. TheTeffvalues of137Cs concentrations in caddisfly larvae estimated by single component decay function model showed significant fit. TheTeffvalues in Kuma, Maeda, downstream Niida, upstream Niida, Ohkawa, and Ukedo river showed 2.8, 5.7, 3.1, 6.7, 0.6, and 4.8 years (34, 68, 38, 80, 6.9, and 58 months), respectively. The results of declining trend in this study were similar to those in previous reported in Fukushima. Further continuous observations using this simple approach of “Caddisfly Watch” make it possible to predict the future of the contamination with radioactive Cs in the river environment.