• Animal introductions to southern systems: lessons for ecology and for policy 

      Chown, S.L.; Spear, D.; Lee, J.E.; Shaw, J.D. (Zoological Society of Southern Africa, 2009-10)
      Numerous animal species have been introduced to areas from which they were previously absent, and many of these have become invasive, with substantial impacts. However, in other cases, impacts are assumed from theory. ...