2006, English, Thesis edition: Effects of trace metals on the Australian abalone, Haliotis rubra Gorski, J

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Physical Description
  • Thesis
Published
  • RMIT University , 2006
Language
  • English

Edition details

Title
  • Effects of trace metals on the Australian abalone, Haliotis rubra
Author
  • Gorski, J
Published
  • RMIT University , 2006
Physical Description
  • Thesis
Subjects
Summary
  • This thesis focussed on the effects of a range of trace metals on various stages of Haliotis rubra development. The trace metals assessed in this thesis were the essential metals Cu, Zn and Fe; and, the non-essential metals Hg, Cd and Pb. Copper and Hg proved to be the two most toxic metals to the life stages of H. rubra studied. The concentrations affecting normal development of the fertilised egg exposed for 48h showed a decreasing order of toxicity with 48hEC50 recorded at 7&​amp;micro;g Cu/​L, 20&​amp;micro;g Hg/​L, 42&​amp;micro;g Zn/​L, 4,102&​amp;micro;g Fe/​L, 4,515&​amp;micro;g Cd/​L, and 5,111&​amp;micro;g Pb/​L. Settlement and metamorphosis occur in normal larvae when aged 5 days, and exposure of the 5 day old larvae to the metals for 48h resulted in impaired crawling success at 128&​amp;micro;g/​L Cu and Hg, and 1250&​amp;micro;g Cd/​L. Settlement was inhibited after exposure to 128&​amp;micro;g Cu/​L, 32&​amp;micro;g Hg/​L, and 1250 Cd/​L. Metamorphosis of larvae 96h after exposu re was inhibited by 32&​amp;micro;g Cu/​L, 512&​amp;micro;g Zn/​L, 32&​amp;micro;g Hg/​L and 625&​amp;micro;g Cd/​L. The rate of metamorphosis was enhanced after exposure to Cu and Hg at 0.5&​amp;micro;g/​L and 64 - 256&​amp;micro;g Zn/​L. Exposure to Zn at concentrations 64, 128 and 256 &​amp;micro;g Zn/​L caused an increased rate of settlement and metamorphosis. Juvenile H. rubra exposed to the six metals for 96h were most sensitive to Cu, which produced a 96hLC50 of 87&​amp;micro;g Cu/​L compared to Hg with a 96hLC50 of 173&​amp;micro;g Hg/​L. Juvenile H. rubra were relatively insensitive to Zn and Cd with the 96h LC50 of 1730&​amp;micro;g Zn/​L and 3700&​amp;micro;g Cd/​L, respectively. Exposure to individual solutions of Cu, Zn, and Cd for 28 days resulted in juvenile H. rubra bioaccumulating significant concentrations of metals in the visceramantleedible foot muscle. Accumulation of Hg was greater in the mantle-viscera-edible foot muscle. Following exposure, depuration in clean seawater for 28 days produced varying decreases in metal concentrations for each tissue compartment. Sodium-potassium activated ATPase (Na+,K+-ATPase) activity in the gills of juvenile H. rubra was significantly affected following exposure to the trace metals for 28 days, with a decreasing order of effect on enzyme activity of Hg-Cu-Cd-Zn. Depuration of H. rubra in clean seawater for 28 days resulted in the recovery of Na+,K+-ATPase activity to varying degrees. The recovery of ATPase activity was more efficient following exposure to Cd-Zn-Cu-Hg. The overall results of this thesis provide initial baseline information to evaluate the sensitivity of H. rubra to trace metal toxicants, and these results may be utilised by regulators for establishing marine water quality guidelines to protect H. rubra and other abalone species in their natural habitats.
Language
  • English
Related Resource
Identifier
  • oai:researchbank.rmit.edu.au:rmit:6357

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