| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2025-12-08 |
| タイトル |
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タイトル |
Environmental and biological drivers of 137Cs accumulation in freshwater fish across forested and downstream sites in Fukushima |
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言語 |
ja |
| 言語 |
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言語 |
jpn |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Kakuma Minato
Wada Toshihiro
Murakami Masashi
Tatsuno Takahiro
石井 伸昌
Kobayashi Natsuko
Kurosawa Takumi
Sayama Yo
Nihei Naoto
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| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
To elucidate the ecological factors governing 137Cs accumulation in freshwater fish, we examined 10 species collected from forested headwater streams and downstream reaches of river systems flowing through the Fukushima evacuation zone. Fish collected from sites with higher forest cover in the upstream catchment exhibited consistently elevated 137Cs concentrations, indicatingthat forested environments serve as persistent sources of radiocesium to aquatic food webs more than a decade after the nuclear accident. Stable isotope analysis of δ13C further suggested that individuals assimilating more terrestrial-derived carbon tended to accumulate higher 137Cs levels. A positive relationship was also observed between relative body size, standardized within each species, and 137Cs concentration, suggesting that growth-related traits influence radiocesium accumulation. These results indicate that forest connectivity, dietary reliance on allochthonous resources, and individual growth characteristics jointly affect 137Cs accumulation in freshwater fish. In addition, migratory behavior may contribute to variation in 137Cs concentrations through shifts in foraging habitats and diet sources, as suggested for particular species. By integrating catchment-scale land cover data with individual isotopic and morphological indicators, our study clarifies the ecological mechanisms shaping radiocesium distribution across fish communities in post-accident environments. The approach and findings contribute to a broader understanding of long-term radiocesium dynamics in forested river networks and inform ecological risk assessment and fisheries management in radiologically impacted landscapes. |
| 書誌情報 |
Journal of Environmental Radioactivity
巻 290,
p. 107810,
発行日 2025-11
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| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0265-931X |
| DOI |
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識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.jenvrad.2025.107810 |
