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Title: Sources and mechanisms of metal bioaccumulation in the Lagaip and Strickland Rivers, Papua New Guinea
Authors: Cresswell, T
Smith, RW
Nugegoda, D
Simpson, S
Keywords: METALS
Issue Date: 11-Nov-2013
Publisher: SETAC AU Madang Workshop Platform
Citation: Cresswell, T., Smith, R. W., Nugegoda, D., & Simpson, S. (11-12 November, 2013). Sources and mechanisms of metal bioaccumulation in the Lagaip and Strickland Rivers, Papua New Guinea.
Abstract: Metal bioaccumulation by aquatic invertebrates in the environment can often be explained by exposure-dose-response relationships created from chemical parameters such as metal concentrations within the solution and particulate phases. Simple relationships of this type are not known for invertebrates in the highly turbid Strickland River, Papua New Guinea. Here, indigenous prawns of the Macrobrachiumgenus demonstrate significant differences in bioaccumulated metal concentrations (predominantly cadmium) between populations exposed to mining effluents compared to those in reference tributaries. However, metal concentrations of waters and sediments are not significantly different between sites. This study was divided into two main components; a chemical survey of the river system aimed at identifying potential sources of bioavailable metals in the dissolved and solid phases; and laboratory-based bioaccumulation assays, using stable and radiolabelled metals. The second component was intended to provide a greater understanding of the significance of each specific metal source to the prawns. The study demonstrated that cadmium bioaccumulation was a result of uptake from solution and assimilation from the diet, whereas lead and arsenic appeared to be bioaccumulated mostly from fine sediment ingestion. The results also identified the difficulty in using a surrogate species to describe trace metal bioaccumulation patterns, even within the same genus. Recommendations for future work are presented.
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