Many species of plants, microbes, and animals have been introduced around the world. Species are considered "invasive" or "alien" when they are not native to an area, but become established and cause, or are likely to cause, economic or environmental harm or harm to human health. In this book, the authors present current research in the study of the threats, ecological impacts and control methods relating to invasive species. Topics include thermochemical processing of wood from invasive arboreal species for sustainable bioenergy generation; invasive rodents in the U.S.; invasive Buprestid beetle species monitoring; the invasive beaver castor canadensis of the Tierra del Fuego Archipelago; leaf-cutting ants; invasive species and accurate ecological assessment in freshwater pollution; and the aquarium trade as a pathway for the introduction of invasive species in Mexico.