Space Invaders:From zebra mussels to water hyacinth, invasive species sabotage outdoor enthusiasts nationwide.

摘要

Duke took off running. His task: to retrieve the duck his owner had just shot. Butthe Louisiana pond where the bird landed was topped by a thick mat of water hyacinth, an invasive plant from South America, and the lab quickly got entangled. "I wondered if I'd have to fetch my own duck," recalls hunter Mike Carloss, "and rescue my dogat the same time."