These studies indicate reductions in the risk of invasive species introductions as a result of ballast water exchange. The analysis provides further confidence that overall, there has been a decline in the risk of invasion from ballast water in these regions. In addition, the report addresses a potential gap in the coastal ballast management protection framework where ships traveling less than 200 miles from the U.S. coast are not covered.
The report suggests that a standardized survey program, targeting key coastal ecosystems in the U.S., could provide the high-quality data necessary to (a) assess current invasion risk and (b) measure the performance of multiple management actions, including those of ships and other transfer mechanisms, in terms of invasion occurrence. No such program currently exists.View the original article here; the full report (TM-142) is available here.