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PLoS One
2022 Jan 01;178:e0269947. doi: 10.1371/journal.pone.0269947.
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Contamination of sea urchin Mesocentrotus nudus by radiocesium released during the Fukushima Daiichi Nuclear Power Plant accident.
Rithu MNA
,
Matsumoto A
,
Hirakawa N
,
Ito Y
,
Arakawa H
.
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Countless marine organisms were polluted with radioactive materials that were dispersed when the Fukushima Daiichi Nuclear Power Plant (FDNPP) was damaged in 2011 by the Great East Japan Earthquake. The aim of this study was to determine the degree to which marine herbivorous sea urchins, Mesocentrotus nudus, were contaminated with radiocesium because of the accident. We collected samples of sea urchins from four locations in Fukushima prefecture (at the coast and offshore from the Yotsukura and Ena stations) and investigated how the 137Cs activity concentrations changed. The biological half-life (Tbio) of 137Cs in the individual sea urchins was between 121 and 157 days. The ecological half-life (Teco) of 137Cs was 181-423 days and was high in places close to the FDNPP. The Teco values in the sea urchins were longer than previously reported. The results infer that the food sources of the sea urchins around the Fukushima coast strongly influenced their uptake of 137Cs.
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35969598
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Fig 1. Sea urchin sampling sites on the Fukushima coast.The Yotsukura and Ena stations are about 35 and 50 km south of the Fukushima Daiichi Nuclear Power Plant (FDNPP), respectively.
Fig 2. Temporal changes in the 137Cs counts in five sea urchins during the rearing period (31 May–30 August 2013) in laboratory conditions.The solid and dashed lines represent statistically significant and insignificant regression slopes, respectively.
Fig 3. Spatial and temporal changes in the 137Cs and 134Cs activity concentrations in sea urchin gonads collected from four fishing grounds in Fukushima Prefecture after the FDNPP accident.Solid and dashed lines represent statistically significant and insignificant regression slopes, respectively. Different trend lines indicate different sampling stations for 137Cs (—Yotsukura coast,—Ena rocky coast,—Yotsukura offshore, and ⏤ · Ena rocky offshore) and 134Cs (—Yotsukura coast,—Ena rocky coast,—Yotsukura offshore, and ⏤ · Ena rocky offshore), respectively. Data below the detection limit and dry weight (DW) basis are excluded.
Fig 4. Spatial and temporal variations in the apparent concentration factor (ACF) of 137Cs in sea urchins.Dashed lines represent statistically insignificant regression slopes.
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