Maritime canals dissolve natural barriers to the dispersal of marine organisms, thus providing them with many opportunities for natural dispersal, as well as for shipping-mediated transport. The introduction of alien species proved to be one of the most profound and damaging anthropogenic deeds - involving both ecological and economic costs. This book is the first to compare the impacts of the three principal maritime canals Kiel, Panama, Suez as invasion corridor for alien biota. The three differ in their geographic locations, hydrological regimes, and in their permeability to alien biota.