ABSTRACT:
When we hear about "invaders," we often imagine the danger these interlopers pose is obvious and immediate. However, newly introduced species may not become invasive for decades after they arrive. In 1993, biologist W.R. Courtenay warned that "every introduction must be viewed as a potential biological "time bomb" waiting to explode at some future time." That same year, a national review of invasive species risks and management approaches (OTA 1993) added that "rapid response is essential."