Seasonal variations of ~(137)Cs concentration in freshwater charr through uptake and metabolism in 1-2 years after the Fukushima accident

Okada Kengo; Sakai Masaru; Gomi TakashiIwamoto AimuNegishi Junjiro N.Nunokawa Masanori

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Seasonal variations of ~(137)Cs concentration in freshwater charr through uptake and metabolism in 1-2 years after the Fukushima accident

机译：Seasonal variations of ~(137)Cs concentration in freshwater charr through uptake and metabolism in 1-2 years after the Fukushima accident

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Understanding the factors influencing Cs-137 concentrations in freshwater salmonids is crucial for reviving inland fisheries in polluted regions. We studied seasonal variations of Cs-137 concentration in charr (Salvelinus leucomaenis) through uptake and metabolism in forested headwaters at Fukushima and Gunma sites. Charr consumed both terrestrial and aquatic animals, and terrestrial prey was predated more in summer at both sites. The Cs-137 concentrations in litter, which is a dominant basal food resource of both forest and stream ecosystems, differed between forest and stream due to Cs-137 leaching effect on litter submerged in streams. The concentration difference in both litter and prey was greater at Fukushima site than at Gunma site. The estimated prey Cs-137 concentration at Fukushima site peaked in summer when terrestrial preys are most available, whereas it remained relatively constant at Gunma site because of the small difference of Cs-137 concentrations in between terrestrial and aquatic preys. The specific metabolic rate of charr was commonly changed with stream water temperature, greatest in summer, and lowest in winter at both sites. Because both prey Cs-137 concentrations and specific metabolic rates peaked in summer, the combination of uptake and metabolism at Fukushima site largely negated seasonal Cs-137 fluctuations in charr, whereas specific metabolic rate fluctuations could be the major determinant of charr Cs-137 concentrations at Gunma site. Our results suggested that Cs-137 concentrations in prey items, whose seasonality are varied due to initial Cs-137 fallout volume, were expected to be an important determinant for Cs-137 concentrations in charr.

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来源
《Ecological research》 |2021年第6期|935-946|共12页
作者
Okada Kengo; Sakai Masaru; Gomi TakashiIwamoto AimuNegishi Junjiro N.Nunokawa Masanori;
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作者单位

Natl Inst Environm Studies, Fukushima Reg Collaborat Res Ctr, 10-2 Fukasaku, Fukushima 9637700, Japan;

Tokyo Univ Agr & Technol, Grad Sch Agr, Tokyo, Japan;

Hokkaido Univ, Fac Environm Earth Sci, Sapporo, Hokkaido, JapanCivil Engn Res Inst Cold Reg, Sapporo, Hokkaido, Japan;

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原文格式 PDF
正文语种英语
中图分类普通生物学;
关键词
freshwater fish; leaching; radiocesium; resource subsidy; riparian forest;

Seasonal variations of ~(137)Cs concentration in freshwater charr through uptake and metabolism in 1-2 years after the Fukushima accident

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