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Type: Journal article
Title: Metals and selenium in the liver and bone of three dolphin species from South Australia, 1988-2004
Author: Lavery, T.
Butterfield, N.
Kemper, C.
Reid, R.
Sanderson, K.
Citation: Science of the Total Environment, 2008; 390(1):77-85
Publisher: Elsevier Science BV
Issue Date: 2008
ISSN: 0048-9697
Statement of
Trish J. Lavery, Nicole Butterfield, Catherine M. Kemper, Robert J. Reid, Ken Sanderson
Abstract: Metal and selenium concentrations (wet weight) were determined in the liver (Cd, Hg, Pb, Zn, Cu and Se) and bone (Pb and Cd) of common dolphins (Delphinus delphis, N=71) and bottlenose dolphins (Tursiops truncatus, N=12, and Tursiops aduncus, N=71) stranded or by-caught in South Australia from 1988 to 2004. Differences in metal burdens existed between species, stranding location, and relative age. T. aduncus had the greatest mean tissue burdens of liver Pb (0.45 mg/kg), Cd (6.45 mg/kg), Hg (475.78 mg/kg), Se (178.85 mg/kg) and Zn (93.88 mg/kg) and bone Pb (2.78 mg/kg), probably reflecting their coastal habitat and benthic prey. Mean Cu was highest in T. truncatus (21.18 mg/kg). Bone Cd was measured only in T. aduncus and averaged 0.05 mg/kg. Stranding location impacted metal burdens. Dolphins from Spencer Gulf had higher mean levels of liver Pb (0.39 mg/kg) while Gulf St Vincent dolphins had greater liver Hg (444.64 mg/kg), liver Se (163.12 mg/kg), and bone Pb (2.85 mg/kg). This may be due to high anthropogenic inputs of Pb and Hg into Spencer Gulf and Gulf St Vincent respectively. Liver Cd, Hg, Se and Pb increased with age in all species while Cu decreased with age, in keeping with previous studies. Se and Hg were positively correlated. The possibility that metallothioneins are driving observed correlations between Zn, Cd, Hg and Cu are discussed. Future research must investigate the toxicological consequences of the metal concentrations reported.
Keywords: Heavy metals; Dolphins; Toxicology; Pollution; Marine environment; Australia
RMID: 0020080137
DOI: 10.1016/j.scitotenv.2007.09.016
Appears in Collections:Earth and Environmental Sciences publications

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