invasive species invade an ecosystem and mess up the ecological balance. Many species go extinct and a new ecological hierarchy is formed and the landscape changes. Isn't this what has been happening for eons? How did marsupials get to Australia from America, how did horses take over the Eurasian steppe, there are many example like that. Who are we to "manage and conserve" biodiversity? I don't think we have the power or the right to do that. just my 2¢.