Summary

Biomagnification is a well-documented phenomenon where persistent hydrophobic organic contaminant concentrations in an animal become elevated over and above its food. This increase in contaminant concentration propagates through successive trophic steps in a food web.

Later definitions of biomagnification and food web biomagnification have imposed thermodynamic criteria specifying that biomagnification reflects a nonequilibrium process in which the chemical potential in an animal is elevated above that of its diet and environment. The GI magnification model and the new amendments to this framework explain how exposures through the diet can raise the chemical potential of the animal above that of its food and environment. The above mechanisms apply specifically to hydrophobic organic contaminants. However, other contaminants such as mercury are assimilated and distributed through tissues by different processes. Thus, while mercury conforms to the classic definition of biomagnification and food web biomagnification it is difficult to evaluate the behavior of this compound in the context of the thermodynamic definition of biomagnifica-tion. Further understanding of uptake, assimilation, and elimination mechanisms and the free energy relationships associated with these processes are needed to provide a unifying theory of biomagnification across other contaminant types.

Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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