Accumulation of radionuclide and metal contaminants in flesh and osteoderms of estuarine crocodiles (crocodylus porosus): pathways and histories of catchment-specific exposure

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dc.contributor.authorJeffree, RAen_AU
dc.contributor.authorMarkich, SJen_AU
dc.contributor.authorHammerton, KMen_AU
dc.contributor.authorRussell, RAen_AU
dc.date.accessioned2024-02-23T00:18:26Zen_AU
dc.date.available2024-02-23T00:18:26Zen_AU
dc.date.issued2002-02en_AU
dc.date.statistics2024-02-20en_AU
dc.descriptionThe title of the Conference is shown on the EDP website as: ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments. This contains a typographical error, the word Estuatine should read Estuarine.en_AU
dc.description.abstractFlesh and osteoderms of estuarine crocodiles (C. porosus) from Kakadu National Park, Northern Australia, were analysed for a range of metals, including uranium, to assess their capability for accumulation, in relation to their catchment-specific exposure to i) uranium mine effluents and mineralisation and ii) lead shot ammunition through their consumption of fauna shot by the traditional owners of the Park. Uranium in osteoderms was significantly (P<0.05) elevated in the East Alligator River catchment, that contains the Ranger and Jabiluka uranium mine sites, relative to two other adjacent catchments. The mean concentrations of other elements in flesh and osteoderms were also significantly (P<0.05) different between catchments. Linear discriminant analysis was used to demonstrate that multi-element signatures in both flesh and osteoderms could be used to classify individual crocodiles to their respective catchments. This approach may be useful for the identification of source catchments of itinerant 'nuisance crocodiles' that find their way into Darwin Harbour, close to dense human habitation. Lead concentrations were significantly (P<0.05) enhanced in flesh and osteoderms of crocodiles sampled within two areas hunted with guns using Pb ammunition. Enhanced ratios of Pb:Ca in the annual laminations of their osteoderms are consistent with their history of continual exposure to elevated anthropogenic Pb sources. Subsequent experimental studies have demonstrated the ability of the crocodilian stomach to retain ingested Pb shot, that is readily solubilised and absorbed into the blood and then archived in the contemporary osteodermal lamination. © EDP Sciences, 2002en_AU
dc.description.sponsorshipThe Biodiversity Group of Environment Australia is thanked for the sampling of osteoderms and flesh from crocodiles in KNP.en_AU
dc.identifier.booktitleProceedings of ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environmentsen_AU
dc.identifier.citationJeffree, R. A., Markich, S. J., Hammerton, K., & Russell, R. (2002). Accumulation of radionuclide and metal contaminants in flesh and osteoderms of estuarine crocodiles (crocodylus porosus): pathways and histories of catchment-specific exposure. In F. Bréchignac (Ed.), Radioprotection, 37,(C1), Proceedings of ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments, Aix-en-Provence, France, 3-7 September, 2001, (pp. C1-853 - C1-857). doi:10.1051/radiopro/2002214en_AU
dc.identifier.conferenceenddate2001-09-07en_AU
dc.identifier.conferencenameECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environmentsen_AU
dc.identifier.conferenceplaceAix-en-Provence, Franceen_AU
dc.identifier.conferencestartdate2001-09-03en_AU
dc.identifier.editorsF. Bréchignacen_AU
dc.identifier.issn1769-700Xen_AU
dc.identifier.issueC1en_AU
dc.identifier.journaltitleRadioprotectionen_AU
dc.identifier.paginationC1-853 - C1-857en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15403en_AU
dc.identifier.volume37en_AU
dc.language.isoenen_AU
dc.publisherEDP Sciencesen_AU
dc.relation.urihttps://doi.org/10.1051/radiopro/2002214en_AU
dc.subjectRadioisotopesen_AU
dc.subjectHeavy metalsen_AU
dc.subjectContaminationen_AU
dc.subjectReptilesen_AU
dc.subjectEstuariesen_AU
dc.subjectNorthern Territoryen_AU
dc.subjectAustraliaen_AU
dc.subjectUraniumen_AU
dc.subjectLeaden_AU
dc.titleAccumulation of radionuclide and metal contaminants in flesh and osteoderms of estuarine crocodiles (crocodylus porosus): pathways and histories of catchment-specific exposureen_AU
dc.typeConference Paperen_AU
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