Some very convincing arguments that invasive species are more often then not beneficial, or at least benign, to local ecosystems. There’s often an element of nationalistic fervour when it comes to these ‘foreign’ interlopers and vast sums of money are spent by governments to defeat them. Pearce would argue for a hands off approach. Unsurprisingly, much of these species initial success occurs where humankind has weakened indigenous flora and fauna to the point they are unable to compete. Yet it appears nature adapts to accept the newcomers and biodiversity increases, rather than decreases.