Transportation networks play a crucial role for the spread of invasive
species. Here, we combine the network of world-wide cargo ship
movements with environmental conditions and biogeography, to develop a
model for marine bioinvasion. We classify marine ecoregions according
to their total invasion risk and the diversity of their invasion
sources. Our predictions agree with observations in the field and
reveal that invasion risks are highest for intermediate geographic
distances. Our findings suggest that network-based invasion models
facilitate the development of targeted mitigation strategies.
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