ABSTRACT
In this chapter we aim to do three things. First, we provide a brief overview of the ecological and economic impacts of naturalized invertebrates. Their ecological impact is very poorly understood, and any attempts to estimate its magnitude are based more on deduction than measurement. For this and other reasons, we consider ecological costs in
non-economic terms rather than in dollar values. The economic impact on primary production and health is more easily assessed, at least in theory, though it has never been attempted in any detail. Our approach is also a straightforward, high-level one, building on and refining the only previous analysis carried out.
