Unwanted networks: Vessel traffic heightens the risk of invasions in marine protected areas

Invasive species pose a significant threat to a primary objective of marine conservation, protecting native biodiversity. To-date, research quantifying invasion risk to marine protected areas (MPAs) is limited despite potential negative consequences. As a first step towards identifying invasion risk to MPAs via vessel ballast or biofouling, we evaluated vessel traffic patterns by applying graph-theoretic concepts for 1346 vessels that connected invaded areas (‘invasion nodes’) along the Northeast Pacific coast to MPAs within Canadian waters in 2016.

The issue of global biodiversity loss is so intense in the present era that it cannot be ignored as according to the reports of Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES), due to human actions an average of around 25 percent of species in assessed ani