Recent improvements in water quality are making many ports increasingly hospitable to foreign invaders. In the 1960s, he muses, Lake Erie was so polluted that an alien species would be as likely to croak as to thrive. Now, however, as coastal water quality continues to improve, alien species may find U.S. waters to be like a resort spa. Squelching gypsy moths. Enserink, M. 1999.
Biological invaders sweep in.
Helmuth, L. 1999. Feds plan battle against aliens. Mae, M.J., et al. Va. Milius, S. 1999. U.S. biosurvey reveals worrisome trends.