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Recent environmental change and trace metal pollution in World Heritage Bathurst Harbour, southwest Tasmania, Australia

Citation

Saunders, KM and Harrison, JJ and Butler, ECV and Hodgson, DA and McMinn, A, Recent environmental change and trace metal pollution in World Heritage Bathurst Harbour, southwest Tasmania, Australia, Journal of Paleolimnology, 50, (4) pp. 471-485. ISSN 0921-2728 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Springer Science+Business Media Dordrecht

DOI: doi:10.1007/s10933-013-9740-8

Abstract

Bathurst Harbour in World Heritage southwest Tasmania, Australia, is one of the world’s most pristine estuarine systems. At present there is a lack of data on pollution impacts or long-term natural variability in the harbor. A ca. 350-year-old 210Pbdated sediment core was analysed for trace metals to track pollution impacts from local and long-range sources. Lead and antimony increased from AD 1870 onwards, which likely reflects remote (i.e. mainland Australian and global) atmospheric pollution sources. Variability in the concentrations of copper and zinc closely followed the history of mining activities in western Tasmania, which began in the AD 1880s. Tin was generally low throughout the core, except for a large peak in AD 1989 ± 0.5 years, which may be a consequence of input from a local small-scale alluvial tin mine. Changes in diatom assemblages were also investigated. The diatom flora was composed mostly of planktonic freshwater and benthic brackish-marine species, consistent with stratified estuarine conditions. Since mining began, however, an overall decrease in the proportion of planktonic to benthic taxa occurred, with the exception of two distinct peaks in the twentieth century that coincided with periods of high rainfall. Despite the region’s remoteness, trace metal analyses revealed evidence of atmospheric pollution from Tasmanian and possibly longer-range mining activities. This, together with recent low rainfall, appears to have contributed to altering the diatom assemblages in one of the most pristine temperate estuaries in the world.

Item Details

Item Type:Refereed Article
Keywords:Bathurst Harbour Tasmania pollution
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Saunders, KM (Dr Krystyna Saunders)
Author:McMinn, A (Professor Andrew McMinn)
ID Code:87637
Year Published:2013
Web of Science® Times Cited:2
Deposited By:IMAS Research and Education Centre
Deposited On:2013-11-28
Last Modified:2017-09-05
Downloads:0

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