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HA5 Bioaccumulation and Biomagnifications
() The bioenergetics of biomagnification.
deBruyn, A.1, Gobas, F.1, 1 Simon Fraser University, Burnaby, BC, Canada
ABSTRACT- Recent advances in our understanding of biomagnification have set the stage for a close integration of ecological energetics theory into models of chemical accumulation. The linchpin between these two fields is the set of parameters describing energy acquisition and utilization: who eats what, how much, and with what efficiency. We will introduce a set of models that formalize the relationship between chemical dynamics and ecological energetics, providing a concise and general framework for understanding how characteristics of an organism and its ecological context influence the degree to which that organism biomagnifies the chemicals present in its diet. Using this approach, we make predictions of chemical biomagnification in a wide range of consumers (terrestrial and aquatic, vertebrate and invertebrate, homeothermic and heterothermic, carnivorous and herbivorous). To evaluate these predictions we will present a meta-analysis of measured BMFs as a function of digestive efficiency and net production efficiency. Because both of these efficiencies can differ between wild and domestic animals, our model highlights some potential problems with assuming that lab-based biomagnification factors reflect chemical accumulation in the field.
Key words: bioenergetics, biomagnification, modelling, POPs
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