Radiological impact of TEPCO's Fukushima Dai-ichi Nuclear Power Plant accident on invertebrates in the coastal benthic food web

Sohtome, Tadahiro; Wada, Toshihiro; Mizuno, Takuji; Nemoto, Yoshiharu; Igarashi, Satoshi; Nishimune, Atsushi; Aono, Tatsuo; Ito, Yukari; Kanda, Jun; Ishimaru, Takashi

doi:10.1016/j.jenvrad.2014.08.008

Cited by 59 publications

(76 citation statements)

References 22 publications

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“…The radionuclide migration in sea deposits is governed by molecular diffusion and reworking of sediments by animals (bioturbation). Continuous measurement of the radiocesium distribution on the sea floor in the vicinity of FDNPP demonstrated strong patchiness of activity [15,37,39]. The potential reasons include heterogeneity in the physical and chemical features of the sediments [22] and local inhomogeneities of the bottom topography resulting in variations in erosion and deposition [39].…”

Section: Introductionmentioning

confidence: 99%

Migration of radioactivity in multi-fraction sediments

et al. 2017

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A new 3D radioactivity transport model coupled with multiscale circulation and multi-fractional sediment transport modules is presented. The sediment transport module simulates the transport of a mixture of one cohesive sediment fraction and a number of fractions of non-cohesive sediments of different sizes and densities. The model of radionuclide transport describes the key transport and exchange processes in the system of water-suspended and bottom multi-fraction sediments. Two-step kinetics with two successive reversible fast and slow reactions is used in the model. A noticeable feature of the model is approximation of the sediment and contamination profiles in the bed by multiple well-mixed layers to describe the vertical migration of radioactivity within bottom sediments due to erosion/deposition, molecular diffusion and bioturbation. The model accurately reproduced a laboratory experiment on the uptake of radiocesium by lake sediments. An analytical solution describing mutual adjustment of the concentrations of radioactivity in the pore water and in the multi-fraction sediment showed that activity was redistributed between different fractions of sediments far slower than between water and the total concentration in the sediment. The extended one-layer model of bottom contamination of multi-fraction sediments was derived from a general model and compared with a multilayer model. It was found, however, that the one-layer approximation was not capable of correctly predicting the inventory due to the fact that one-layer averaged concentration can essentially differ from the near-surface value in the multi-layer model. Radionuclide 123Environ Fluid Mech (2017) 17:1207-1231 DOI 10.1007 transport in channel with bottom depression was simulated to estimate the effects of erosion/deposition and the multi-fractionality of sediments on the transport process. It was shown that these factors affect the distribution of sediments by forming local maxima and minima of activity at the beginning and end of the depression, respectively, due to the redistribution of contaminated bottom sediments by flow. The developed model can also be used to simulate the transport of a wide class of toxic substances sorbed on sediments.

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Section: Introductionmentioning

confidence: 99%

Migration of radioactivity in multi-fraction sediments

et al. 2017

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“…The half-life was longer in old and larger individuals than in young and small individuals, probably a result of differences in metabolic rate and growth rates between age and body size classes (Doi et al 2012 ). Radiocesium concentrations decreased to low levels soon after the accident in seawater and prey items (Buesseler et al 2011 ;Aoyama et al 2013 ) and have continued to decease in the period up to 2014 (Sohtome et al 2014 ). Thus, the potential for intake of radiocesium from the benthic ecosystem is very low in and after 2014.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, high concentrations of radiocesium were detected in almost all fi sh that inhabit the coast of Fukushima Prefecture within a year after the tsunami (Buesseler 2012 ). The level of contamination has decreased over time, and has now stabilized at a low level in pelagic fi sh species and invertebrates (Wada et al 2013 ;Sohtome et al 2014 ). In contrast, the decline in radionuclide levels has occurred more slowly in demersal fi shes, resulting in food safety problems.…”

Section: Introductionmentioning

confidence: 99%

Why Do the Radionuclide Concentrations of Pacific Cod Depend on the Body Size?

Narimatsu

Sohtome

Yamada

et al. 2015

Impacts of the Fukushima Nuclear Accident on Fish and Fishing Grounds

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We examined year-class-related differences in radiocesium concentrations in Pacifi c cod ( Gadus macrocephalus ) and evaluated the potential factors affecting the differences after the release of large amounts of radionuclides from Fukushima Dai-ichi Nuclear Power Plant (FNPP) in March 2011. The concentration of radiocesium was highest in the 2009 and earlier year-classes (yc) (≤2009 yc), followed by the 2010 yc, and was rarely detected in the 2011 yc. Trawl surveys throughout the year revealed that a proportion of Pacifi c cod born in or before 2009 and 2010 were distributed in the coastal area from winter to early summer, whereas all individuals were on the upper continental slope from early summer to winter. The concentration of radiocesium decreased more rapidly in the 2010 yc than in the ≤2009 yc. The diet of cod changed ontogenetically and spatiotemporally. The organisms preyed upon on the upper continental slope by cod of all year-classes and in the coastal area by the 2010 yc contained very low concentrations of radiocesium. However, some food items ingested in the coastal area by the ≤2009 yc had relatively

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“…Despite significant data scatter, it shows that benthic fish, which live and feed in close proximity to bottom sediments, have higher Cs activity concentrations than pelagic fish (Wada et al, 2013). It is also clear that biota landed in the Fukushima Prefecture have levels higher than elsewheresee Figure 5 of Buesseler et al (2017) and Sohtome et al (2014).…”

Section: State Of Knowledge On the Impact Of The Fdnpp Accident On Thmentioning

confidence: 98%

“…The radioactive contamination in seabed sediments from sites off the east coast of Japan is dominated by 134 Cs and 137 Cs (Ambe et al, 2014;Black and Buesseler, 2014;Kusakabe et al, 2013;Nagaoka et al, 2015;Otosaka and Kato, 2014;Otosaka and Kobayashi, 2013;Sohtome et al, 2014;Thornton et al, 2013). The inventories of 137 Cs in the sea floor from 35.5 to 39° N off Japan out to 4000-m depth range from < 50 Bq m -2 (comparable to the inventories due to global fallout) to some 10 5 Bq m -2 in sediments closest to the FDNPP, totalling less than 1% of the estimated total of 15-30 PBq of radiocaesium released during the FDNPP disaster (Black and Buesseler, 2014;Kusakabe et al, 2013), most of which ended in the ocean and originated from atmospheric deposition.…”

Section: State Of Knowledge On the Impact Of The Fdnpp Accident On Thmentioning

confidence: 99%

Marine radioecology after the Fukushima Dai-ichi nuclear accident: Are we better positioned to understand the impact of radionuclides in marine ecosystems?

Batlle

Aoyama

Bradshaw

et al. 2018

Science of The Total Environment

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This paper focuses on how a community of researchers under the COMET (CO-ordination and iMplementation of a pan European projecT for radioecology) project has improved the capacity of marine radioecology to understand at the process level the behaviour of radionuclides in the marine environment, uptake by organisms and the resulting doses after the Fukushima Dai-ichi nuclear accident occurred in 2011. We present new radioecological understanding of the processes involved, such as the interaction of waterborne radionuclides with suspended particles and sediments or the biological uptake and turnover of radionuclides, which have been better quantified and mathematically described.We demonstrate that biokinetic models can better represent radionuclide transfer to biota in nonequilibrium situations, bringing more realism to predictions, especially when combining physical, chemical and biological interactions that occur in such an open and dynamic environment as the ocean. As a result, we are readier now than we were before the FDNPP accident in terms of having models that can be applied to dynamic situations.The paper concludes with our vision for marine radioecology as a fundamental research discipline and we present a strategy for our discipline at the European and international levels. The lessons learned 2 are presented along with their possible applicability to assess/reduce the environmental consequences of future accidents to the marine environment and guidance for future research, as well as to assure sustainability of marine radioecology in Europe and globally. This guidance necessarily reflects on why and where further research funding is needed, signalling the way for future investigations.3

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Radiological impact of TEPCO's Fukushima Dai-ichi Nuclear Power Plant accident on invertebrates in the coastal benthic food web

Cited by 59 publications

References 22 publications

Migration of radioactivity in multi-fraction sediments

Migration of radioactivity in multi-fraction sediments

Why Do the Radionuclide Concentrations of Pacific Cod Depend on the Body Size?

Marine radioecology after the Fukushima Dai-ichi nuclear accident: Are we better positioned to understand the impact of radionuclides in marine ecosystems?

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