The NY Times has competed an article about the extent of human impact on the oceans, and aquatic invasive species are listed as a primary threat.
Map showing distribution of AIS impacts
Article on AIS impacts
This article was written using the following sources:
National Center for Ecological Analysis and Synthesis's "A Global Map of Human Impacts to Marine Ecosystems" and Halpern, B.S., et al. 2008. A Global Map of Human Impact on Marine Ecosystems. Science 319, 948.