Radioecological aftermath: Maternal transfer of anthropogenic radionuclides to shark progeny is sustained and enhanced well beyond maternal exposure

Jeffree, RA; Oberhaensli, F; Teyssie, JL; Fowler, SW

Radioecological aftermath: Maternal transfer of anthropogenic radionuclides to shark progeny is sustained and enhanced well beyond maternal exposure

Jeffree, RA Oberhaensli, F Teyssie, JL Fowler, SW

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Publication Type:: Journal Article
Citation:: Journal of Environmental Radioactivity, 2018, 192 pp. 573 - 579
Issue Date:: 2018-12-01

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Field	Value	Language
dc.contributor.author	Jeffree, RA	en_US
dc.contributor.author	Oberhaensli, F	en_US
dc.contributor.author	Teyssie, JL	en_US
dc.contributor.author	Fowler, SW	en_US
dc.date.available	2021-01-01T18:05:09Z
dc.date.issued	2018-12-01	en_US
dc.identifier.citation	Journal of Environmental Radioactivity, 2018, 192 pp. 573 - 579	en_US
dc.identifier.issn	0265-931X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/134386
dc.description.abstract	© 2018 Elsevier Ltd Cartilaginous dogfish Scyliorhinus canicula continued to transfer four anthropogenic radionuclides (65Zn, 60Co, 134Cs and 241Am) to their eggs for over six months, after two months of continued maternal exposure to radio-labelled food. Unexpectedly, rates of radionuclide transfers to eggs and their yolk & embryo during maternal depuration were equivalent for 60Co and 241Am, or even enhanced for 65Zn and 134Cs by factors of c.200–350%, over two-three months, compared to their maximal transfer rates at the end of the maternal uptake phase. These rates of maternal transfer of radionuclides to yolk & embryo were positively associated with their previously determined efficiencies of assimilation (AE) from ingested radio-labelled food. Thus progeny may be more exposed via maternal transfer to those radionuclides which have greater rates of maternal assimilation from food. As maternal depuration continued beyond 60–80 up to 180–200 days the transfers of all four radionuclides to eggs did diminish but were still substantial at mean values of 18% for 241Am, 17% for 134Cs and 9 and 8% for 60Co and 65Zn, respectively. In the yolk & embryo the mean rates of transfer over this period were further reduced for 241Am (13.5%), 60Co (2.5%) and 65Zn (5.8%), but were still appreciable for 134Cs at 56%. These results for S. canicula have demonstrated a potential enhanced radiological risk of extended duration due to the particular biokinetics of maternal transfer in this species. This study draws further attention to the current paucity of knowledge about the maternal: progeny transfer pathway, particularly in the context of the known heightened radio-sensitivity of early life stages in fish and other vertebrates, compared to later life stages.	en_US
dc.relation.ispartof	Journal of Environmental Radioactivity	en_US
dc.relation.isbasedon	10.1016/j.jenvrad.2018.05.002	en_US
dc.subject.classification	Environmental Sciences	en_US
dc.subject.mesh	Animals	en_US
dc.subject.mesh	Sharks	en_US
dc.subject.mesh	Americium	en_US
dc.subject.mesh	Cesium Radioisotopes	en_US
dc.subject.mesh	Water Pollutants, Radioactive	en_US
dc.subject.mesh	Radiation Monitoring	en_US
dc.subject.mesh	Maternal Exposure	en_US
dc.subject.mesh	Female	en_US
dc.title	Radioecological aftermath: Maternal transfer of anthropogenic radionuclides to shark progeny is sustained and enhanced well beyond maternal exposure	en_US
dc.type	Journal Article
utslib.citation.volume	192	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	0305 Organic Chemistry	en_US
utslib.for	03 Chemical Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	192	en_US

Abstract:

© 2018 Elsevier Ltd Cartilaginous dogfish Scyliorhinus canicula continued to transfer four anthropogenic radionuclides (65Zn, 60Co, 134Cs and 241Am) to their eggs for over six months, after two months of continued maternal exposure to radio-labelled food. Unexpectedly, rates of radionuclide transfers to eggs and their yolk & embryo during maternal depuration were equivalent for 60Co and 241Am, or even enhanced for 65Zn and 134Cs by factors of c.200–350%, over two-three months, compared to their maximal transfer rates at the end of the maternal uptake phase. These rates of maternal transfer of radionuclides to yolk & embryo were positively associated with their previously determined efficiencies of assimilation (AE) from ingested radio-labelled food. Thus progeny may be more exposed via maternal transfer to those radionuclides which have greater rates of maternal assimilation from food. As maternal depuration continued beyond 60–80 up to 180–200 days the transfers of all four radionuclides to eggs did diminish but were still substantial at mean values of 18% for 241Am, 17% for 134Cs and 9 and 8% for 60Co and 65Zn, respectively. In the yolk & embryo the mean rates of transfer over this period were further reduced for 241Am (13.5%), 60Co (2.5%) and 65Zn (5.8%), but were still appreciable for 134Cs at 56%. These results for S. canicula have demonstrated a potential enhanced radiological risk of extended duration due to the particular biokinetics of maternal transfer in this species. This study draws further attention to the current paucity of knowledge about the maternal: progeny transfer pathway, particularly in the context of the known heightened radio-sensitivity of early life stages in fish and other vertebrates, compared to later life stages.

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http://hdl.handle.net/10453/134386