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Tytuł pozycji:

Environmental fate of radiocesium in biota inhabiting a contaminated ecosystem on the U.S. Department of Energy's Savannah River Site.

Tytuł :
Environmental fate of radiocesium in biota inhabiting a contaminated ecosystem on the U.S. Department of Energy's Savannah River Site.
Autorzy :
Leaphart JC; University of Georgia, Savannah River Ecology Laboratory, Aiken, SC, 29802, USA; University of Georgia, Daniel B. Warnell School of Forestry and Natural Resources, Athens, GA, 30602, USA. Electronic address: .
Korotasz AM; University of Georgia, Savannah River Ecology Laboratory, Aiken, SC, 29802, USA.
Bryan AL Jr; University of Georgia, Savannah River Ecology Laboratory, Aiken, SC, 29802, USA.
Beasley JC; University of Georgia, Savannah River Ecology Laboratory, Aiken, SC, 29802, USA; University of Georgia, Daniel B. Warnell School of Forestry and Natural Resources, Athens, GA, 30602, USA.
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Źródło :
Journal of environmental radioactivity [J Environ Radioact] 2020 Oct; Vol. 222, pp. 106321. Date of Electronic Publication: 2020 Jul 17.
Typ publikacji :
Journal Article
Język :
English
Imprint Name(s) :
Original Publication: Barking, Essex : Elsevier Applied Science Publishers,
MeSH Terms :
Radiation Monitoring*
Water Pollutants, Chemical*
Water Pollutants, Radioactive*
Animals ; Biota ; Ecosystem ; Environmental Monitoring ; Fishes ; Food Chain ; Rivers ; United States
Contributed Indexing :
Keywords: (137)Cs; Bioaccumulation; Biomagnification; Food webs; Herpetofauna; Radiocesium
Substance Nomenclature :
0 (Water Pollutants, Chemical)
0 (Water Pollutants, Radioactive)
Entry Date(s) :
Date Created: 20200907 Date Completed: 20200914 Latest Revision: 20200914
Update Code :
20201023
DOI :
10.1016/j.jenvrad.2020.106321
PMID :
32892897
Czasopismo naukowe
Although biomagnification of radiocesium ( 137 Cs) has been reported in food webs, most previous research has been limited to select trophic linkages. Few studies have included a comprehensive survey of fauna associated with aquatic, semi-aquatic, and terrestrial habitats within a single study framework. The objectives of this study were to advance our understanding of the dynamics of 137 Cs accumulation within food webs by quantifying 137 Cs activity across a wide range of biota found within a contaminated canal, as well as test the hypothesis that life-stage and body size influence 137 Cs bioaccumulation in select herpetofauna. With extensive sampling across multiple taxa collected from a contaminated canal system and associated floodplain on the Savannah River Site, we assessed 137 Cs activity and stable nitrogen isotopes for both aquatic organisms that were restricted to the contaminated effluent canal, and semi-aquatic organisms able to move freely between the contaminated canal and the adjacent uncontaminated terrestrial habitat. We found 137 Cs activity to be highly variable among species, with evidence for and against biomagnification in semi-aquatic and aquatic organisms, respectively. Furthermore, 137 Cs activity decreased with life stage and body size in bullfrogs (Lithobates catesbeianus), despite post-metamorphic bullfrogs having a more carnivorous diet compared to tadpoles, while cottonmouths (Agkistrodon piscivorus) retained similar 137 Cs activity regardless of their age and size. Although evidence of biomagnification has been observed in some contaminated systems, results of our study suggest the extent to which 137 Cs biomagnifies within food webs is context-dependent and likely influenced by a suite of biotic and abiotic factors. Further, our data indicate sampling of a broad suite of species and environmental attributes are needed to elucidate the fate and dynamics of anthropogenic pollutants within contaminated ecosystems.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)

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