Patterns of metal accumulation in osteoderms of the Australian freshwater crocodile, Crocodylus johnstoni

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dc.contributor.author Jeffree, Ross en_US
dc.contributor.author Markich, Scott en_US
dc.contributor.author Tucker, Anton en_US
dc.contributor.editor en_US
dc.date.accessioned 2012-02-02T07:00:53Z
dc.date.available 2012-02-02T07:00:53Z
dc.date.issued 2005 en_US
dc.identifier 2010003814 en_US
dc.identifier.citation Jeffree Ross, Markich Scott, and Tucker Anton 2005, 'Patterns of metal accumulation in osteoderms of the Australian freshwater crocodile, Crocodylus johnstoni', Elsevier Inc, vol. 336, no. 1-3, pp. 71-80. en_US
dc.identifier.issn 0048-9697 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/14829
dc.description.abstract The concentrations of 15 metals were measured in the osteoderms (dermal bones) of 30 freshwater crocodiles (Crocodylus johnstoni) from a single population in the Lynd River, northeastern Australia (17j50VS, 144j20VE), that were well characterised with respect to site fidelity, reproductive status and age. Multiple linear regression analyses were used to determine the effects of crocodile size (snout-vent length, 25?128 cm), age (0.7?62.7 years), gender (male or female) and reproductive status (sexually mature or immature) on osteoderm metal concentrations. Gender and reproductive status were not significant ( P>0.05) co-predictors of the osteoderm concentration of any metal. In contrast, size, age and osteoderm calcium concentration were highly significant ( P < 0.001) systematic predictors of the osteoderm concentrations of all metals, except Na and K. Osteoderm metal concentrations were inversely related ( P < 0.001) to both size (r2 = 0.52 0.92) and age (r2 = 0.52 0.84), but positively related ( P < 0.001) to osteoderm calcium concentration (r2 = 0.67 0.92). Relative to calcium concentration, the rates of metal accumulation in the osteoderms of C. johnstoni were inversely related to the solubility constant (log Ksp) of the metal as a phosphate; however this relationship was not linear. This finding is consistent with that previously established for the flesh of freshwater bivalves, which like the crocodilian osteoderm, have a calcium phosphate repository in the form of extracellular granules. The constancy of this relationship between rate of metal accumulation and relative solubility for calcium phosphate deposits, despite contrasting Ca accumulation regimes and taxonomic dissimilarity, points to a potential underlying principle that warrants investigation in a greater range of biota. The implications for using the osteoderms of C. johnstoni as an indicator of metal levels in freshwater ecosystems are also discussed. en_US
dc.language en_US
dc.publisher Elsevier Inc en_US
dc.relation.isbasedon http://dx.doi.org/10.1016/j.scitotenv.2004.05.021 en_US
dc.title Patterns of metal accumulation in osteoderms of the Australian freshwater crocodile, Crocodylus johnstoni en_US
dc.parent The Science of the Total Environment en_US
dc.journal.volume 336 en_US
dc.journal.number 1-3 en_US
dc.publocation Amsterdam, Netherlands en_US
dc.identifier.startpage 71 en_US
dc.identifier.endpage 80 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 060204 en_US
dc.personcode 110409 en_US
dc.personcode 0000068979 en_US
dc.personcode 89156622 en_US
dc.percentage 100 en_US
dc.classification.name Freshwater Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords Metal; Accumulation; Osteoderm; Crocodile; Fres en_US
dc.staffid en_US


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