Biomarkers of Heavy Metal Contamination in the Red Fingered Marsh Crab, Parasesarma erythodactyla |
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Authors: | G R MacFarlane M Schreider B McLennan |
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Institution: | (1) School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW, 2308, Australia;(2) Centre for Sustainable Use of Coasts and Catchments, University of Newcastle, Ourimbah, NSW, 2258, Australia |
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Abstract: | Variation in glutathione antioxidant biochemistry in response to metal contamination and accumulation under field conditions
was examined in the brachyurid grapsid, Parasesarma erythodactyla. Significant relationships suggesting accumulation were found between sediment metals and metals in crab tissue for Pb, Cu,
Cr, Zn, and Se in males and Cd, Pb, Cr Zn, As, and Se in females. Higher pH and lower organic content were associated with
greater uptake of selected metals in males and females. Higher salinity was related to increased metal uptake for Cu and Zn
in males and lower salinities to increased Se uptake for males and females. When examining metals, which were elevated in
crabs, patterns of site discrimination were similar to sediment metal site discrimination for both males and females. In terms
of biochemical responses, glutathione levels remained constant while glutathione peroxidase activity was elevated in individuals
where metals were elevated. Only females with the highest levels of accumulated metals exhibited increases in lipid peroxidation
products. Glutathione peroxidase activity may be a sensitive biomarker of metal exposure and biological effect and lipid peroxides
as a secondary marker when accumulated metals are high. |
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Keywords: | |
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