WHAT THE EVIDENCE SAYS
Canavan and coauthors separate primary movement into a new biogeographic region from secondary pathways after an invader becomes established. The conceptual distinction highlights different management responsibilities and intervention opportunities.
WHY IT MATTERS / OUR READ
Port inspection and internal containment are not interchangeable; policy should name which invasion stage it aims to interrupt.
CAVEATS / UNCERTAINTY
Perspective and proposed classification, not a controlled comparison of global intervention success.
SOURCE
Biological Invasions — Canavan et al. (30 Oct 2026)
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