Seasonal variation of Cesium-137 concentration in Asian black bear (Ursus thibetanus) and wild boar (Sus scrofa) in Fukushima Prefecture, Japan

PloS One
Yui NemotoHitoshi Oomachi

Abstract

To elucidate and reduce the risk of radionuclide contamination in wildlife caused by the Tokyo Electric Power Company Fukushima Dai-ichi Nuclear Power Station accident, it is important to understand radionuclide variations in the wild animal population. Here, we used environmental monitoring data and muscle samples collected from Asian black bear (Ursus thibetanus) and wild boar (Sus scrofa) from May 2011 to March 2016 to examine seasonal variation in radiocesium (137Cs) concentrations in muscle tissues (hereafter, muscle 137Cs) of these important game species in Fukushima Prefecture. We measured muscle 137Cs of bears and wild boars killed by hunters or in animal control culls. First, using a linear mixed model (LMM), we tested for a positive relationship between muscle 137Cs and 137Cs in the soil at the site of capture (hereafter, soil 137Cs) estimated from a soil 137Cs deposition map produced by the Japan Atomic Energy Agency. In the LMM, muscle 137Cs was positively related to estimated soil 137Cs, which corroborates the results of previous studies. The LMM regression coefficients differed between the two species, with wild boar muscle 137Cs being higher than that of bears sampled at the same locations. We then employed a gen...Continue Reading

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Citations

Feb 18, 2020·Journal of Food Protection·Mayumi HachinoheShinichi Kawamoto
May 29, 2020·The Science of the Total Environment·Hannah C GerkeJames C Beasley
Jun 15, 2021·Annals of the ICRP·H Tsukada
Aug 2, 2021·The Science of the Total Environment·Oliver Meisenberg, Udo C Gerstmann

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Software Mentioned

mgcv
lme4
ERICA
MuMIn
QGIS
GAMM
R3

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