Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams

Abstract The Fukushima accident emitted radioactive substances into the environment, contaminating litter, algae, sand substrate, aquatic invertebrates, and fish in freshwater streams. Because these substances have substantial effects on stream ecology over many years, it is necessary to clarify the...

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Autores principales:	Mayumi Yoshimura, Akio Akama
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/adf3266de2524d3db3352b96c3c60f7b
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spelling	oai:doaj.org-article:adf3266de2524d3db3352b96c3c60f7b2021-12-02T15:11:49ZDifference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams10.1038/s41598-020-78844-82045-2322https://doaj.org/article/adf3266de2524d3db3352b96c3c60f7b2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78844-8https://doaj.org/toc/2045-2322Abstract The Fukushima accident emitted radioactive substances into the environment, contaminating litter, algae, sand substrate, aquatic invertebrates, and fish in freshwater streams. Because these substances have substantial effects on stream ecology over many years, it is necessary to clarify the diffusion and decay mechanisms of radiocesium. The transfer coefficient differed among aquatic invertebrate groups, likely due to the differences in habitat. The ecological half-life of cesium was longer where the air dose rate was lower. The transfer coefficient was also higher in areas with lower air dose rate. The radiocesium concentration in algae was inversely related to stream current velocity in the radiocesium-contaminated area. However, this relationship was not observed in the lower air dose rate area: the radiocesium concentration in algae in the rapid-velocity areas tended to be higher than that in the slow-velocity areas. This reverse trend would lead to a longer period of freshwater contamination. The radiocesium concentration would continue to decrease in highly contaminated areas, but it would be difficult to reduce the radiocesium concentration in less-contaminated areas because different contamination mechanisms are at work. Controlling the water flow is key to regulating radiocesium concentration in freshwater ecosystems.Mayumi YoshimuraAkio AkamaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-12 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mayumi Yoshimura Akio Akama Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams
description	Abstract The Fukushima accident emitted radioactive substances into the environment, contaminating litter, algae, sand substrate, aquatic invertebrates, and fish in freshwater streams. Because these substances have substantial effects on stream ecology over many years, it is necessary to clarify the diffusion and decay mechanisms of radiocesium. The transfer coefficient differed among aquatic invertebrate groups, likely due to the differences in habitat. The ecological half-life of cesium was longer where the air dose rate was lower. The transfer coefficient was also higher in areas with lower air dose rate. The radiocesium concentration in algae was inversely related to stream current velocity in the radiocesium-contaminated area. However, this relationship was not observed in the lower air dose rate area: the radiocesium concentration in algae in the rapid-velocity areas tended to be higher than that in the slow-velocity areas. This reverse trend would lead to a longer period of freshwater contamination. The radiocesium concentration would continue to decrease in highly contaminated areas, but it would be difficult to reduce the radiocesium concentration in less-contaminated areas because different contamination mechanisms are at work. Controlling the water flow is key to regulating radiocesium concentration in freshwater ecosystems.
format	article
author	Mayumi Yoshimura Akio Akama
author_facet	Mayumi Yoshimura Akio Akama
author_sort	Mayumi Yoshimura
title	Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams
title_short	Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams
title_full	Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams
title_fullStr	Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams
title_full_unstemmed	Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams
title_sort	difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/adf3266de2524d3db3352b96c3c60f7b
work_keys_str_mv	AT mayumiyoshimura differenceofecologicalhalflifeandtransfercoefficientinaquaticinvertebratesbetweenhighandlowradiocesiumcontaminatedstreams AT akioakama differenceofecologicalhalflifeandtransfercoefficientinaquaticinvertebratesbetweenhighandlowradiocesiumcontaminatedstreams
_version_	1718387652242178048

Difference of ecological half-life and transfer coefficient in aquatic invertebrates between high and low radiocesium contaminated streams

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