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RISS 인기검색어
- 검색키워드
- 저자 : Joji M. Otaki (검색결과 3 건)
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Atsuki Hiyama,Wataru Taira,Ko Sakauchi,Joji M. Otaki 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2
The pale grass blue butterfly, Zizeeria maha (Lepidoptera, Lycaenidae), has successfully been employed as an indicator species to evaluate acute biological changes in polluted human-living environments after the Fukushima nuclear accident. Here, we quantitatively examined the field sampling efficiency of the butterfly and its associated sexual sampling bias under different conditions, which may provide important information for environmental risk assessment. Sampling data were obtained in 2014 and 2015 from 87 localities across Japan. Across the localities, the mean capture rate was 17 individuals per hour per person, and males represented approximately 80% of the collected butterflies. No significant difference was detected in the capture rate under different weather conditions. Among the four habitats, the riverside showed a significantly higher capture rate than the city park. A shorter sampling time tended to yield a higher capture rate. Comparisons among prefectures and districts of collection localities revealed that the Kanto district had significantly higher percentages of collected males than 4 other districts. Fukushima prefecture also had high percentage, although not significant. A generalized linear mixed model indicated that the capture rate was significantly negatively affected by the agricultural village, the city park, the rainy weather, and latitude and positively by longitude. Together, the present study showed high sampling efficiency and versatility of this butterfly as an indicator for environmental risk assessment but simultaneously suggested preferable conditions for a field sampling design. This study also suggested a possibility that the Fukushima nuclear accident or other factors might have affected behavioral or population dynamics of the butterfly.
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Ko Sakauchi,Wataru Taira,Atsuki Hiyama,Tetsuji Imanaka,Joji M. Otaki 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.1
Biological impacts of the Fukushima nuclear accident have been reported in various organisms but have not been evaluated sufficiently. Here, we collected the pale grass blue butterfly, Zizeeria maha, in September 2016, 5.5 years after the accident, from ex-evacuation zones in Fukushima Prefecture to evaluate the remaining biological effects of the accident. Although the morphological abnormality rate was not high, it was significantly positively correlated with the initial 131 I and 137 Cs deposition levels (as of March 2011). The capture rate was negatively correlated with the initial 137 Cs deposition level at the borderline of significance. Neither the abnormality rate nor the capture rate was correlated with the ground radiation dose (as of September 2016). Generalized linear model (GLM) analysis also indicated contributions of the initial 131 I and 137 Cs deposition levels but not the ground radiation dose. These results suggest that the butterflies present in the ex-evacuation zones in 2016 were still affected, although not severely, mainly because of the initial high-dose exposure to radioiodine, radiocesium, and other radionuclides. We conclude that transgenerational effects of radioactive contamination have successively manifested in the 5.5 years since the accident, possibly through genetic mutations, although potential contributions of other modes of damage cannot be ignored.
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Atsuki Hiyama,Wataru Taira,Mayo Iwasaki,Ko Sakauchi,Masaki Iwata,Joji M. Otaki 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
Morphological abnormalities of the pale grass blue butterfly, Zizeeria maha (Kollar) (Lepidoptera: Lycaenidae), have been successfully used as an environmental indicator to assess the biological impacts of the Fukushima Daiichi Nuclear Power Plant accident. To prepare for future nuclear accidents or other human and natural disasters, we examined the morphological abnormality rate of this butterfly in southwestern Japan and built a pre-disaster reference data set. We collected butterfly samples, primarily in summer 2015 from 52 localities, which were categorized into three regional groups associated with the Sendai, Ikata, or Takahama Nuclear Power Plant. Mean values of the abnormality rate and the wing color pattern modification rate for localities were 3.8% and 0.8%, respectively, indicating that butterflies were not under severe anthropogenic stress. Using all collected samples, the abnormality rate of females (7.4%) was significantly higher than that of males (2.8%). We did not detect any significant correlations of the abnormality rate or modification rate with latitude, ground radiation dose, or distance from the nuclear power plants. Based on logistic regression analyses, sex, annual average temperature, and monthly average temperature might have influenced morphological abnormalities, suggesting possible direct and epigenetic temperature effects on morphogenesis. These data serve as a reference data set for future nuclear accidents or other artificial or natural environmental disasters in southwestern Japan.
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