Application of a kinetic model to demonstrate how selective feeding could alter the amount of cadmium accumulated by the blue mussel (Mytilus trossolus)
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| Authors: | Bendell-Young, LI; Arifin, Z |
| Year: | 2004 |
| Journal: | Journal of Experimental Marine Biology and Ecology 298: 21-33 |
| Title: | Application of a kinetic model to demonstrate how selective feeding could alter the amount of cadmium accumulated by the blue mussel (Mytilus trossolus) |
| Abstract: | Filter-feeding bivalves are well adapted to a changing food environment, capable of a highly selective feeding strategy. This feeding behaviour results in the rejection of unwanted material as pseudofeces. To assess the importance of a selective feeding behaviour performed by filter-feeding bivalves in influencing amounts of metal accumulated by bivalves, we applied a kinetic model of metal accumulation modified to incorporate feeding behaviour defined as (1) the sorting efficiency (SEF; the ability of the mussel to select organic matter (OM) over inorganic matter (IM) from suspended particulate matter (SPM) cleared from the water column) and (2) rate of rejection of unwanted SPM as pseudofeces (PF). Predicted mussel Cd concentrations (Cd-muss) were compared with Cd-muss predicted without incorporating feeding behaviour as well as to observed Cd-muss. SEF was important at an SPM quality greater than 10% OM; PF production was important at an SPM quantity greater than 3.5 mg l(-1) with the influence of PF production on predicted Cd-muss increasing with increasing SPM concentration. Our results suggest that a selective feeding behaviour and the generation of pseudofeces could influence amounts of metal ingested, especially under conditions where SPM quality and quantity are highly variable. Under conditions of high SPM, the influence of SEF and PF production on final Cd-muss should be taken into consideration. (C) 2003 Elsevier B.V All rights reserved. |
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