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- W3171957020 abstract "Abstract Understanding the factors influencing 137 Cs concentrations in freshwater salmon crucial for reviving inland fisheries in polluted regions. We studied seasonal variations of 137 Cs concentration in charr ( Salvelinus leucomaenis ) through uptake and metabolism in forested headwaters at highly (HCS) and moderately contaminated sites (MCS). Charr consumed both terrestrial and aquatic animals, and terrestrial prey was predated more in summer at both sites. The 137 Cs concentrations in litter, which is a dominant basal food resource of both forest and stream ecosystems, differed between forest and stream due to 137 Cs leaching effect on litter submerged in streams. The difference was greater at HCS than at MCS. The 137 Cs concentration in terrestrial preys was also much higher than aquatic preys at HCS compared to MCS. The estimated prey 137 Cs concentration at HCS peaked in summer when terrestrial preys are most available, whereas it remained relatively constant at MCS because of the small difference of 137 Cs 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 137 Cs concentrations and specific metabolic rates peaked in summer, the combination of uptake and metabolism at HCS largely negated seasonal 137 Cs fluctuations in charr, whereas specific metabolic rate fluctuations could be the major determinant of charr 137 Cs concentrations at MCS. Our results suggested the importance of balance between 137 Cs uptake and metabolism in the management of 137 Cs in salmonids inhabiting forested headwaters." @default.
- W3171957020 created "2021-06-22" @default.
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- W3171957020 date "2021-05-29" @default.
- W3171957020 modified "2023-09-26" @default.
- W3171957020 title "Seasonal variations of 137Cs concentration in freshwater charr through uptake and metabolism in 1–2 years after the Fukushima accident" @default.
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- W3171957020 doi "https://doi.org/10.1101/2021.05.28.446093" @default.
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