The introduction of invasive species can result in the extinction of local species and irreparable changes to the habitat and biodiversity of invaded ecosystems (Chornesky and Randall 2003). The Convention on Biological Diversity lists invasive species as one of the direct drivers of biodiversity loss (CBD 2007).irect costs are those related to controlling the spread of invasive species, such as the use of pesticides applied in an attempt to contain the spread of pests. Indirect costs relate to the ecosystem services lost through such destruction (Global Invasive Species Program 2007).