Professor Marnie Campbell stood at the intersection of two urgent challenges: protecting one of Earth's most biodiverse marine sanctuaries while preserving the livelihoods of island communities that depend on tourism. Now, researchers at Edith Cowan University have charted a course between them.
The Galápagos Islands, a UNESCO World Heritage site that inspired Darwin's theory of evolution, face an invisible threat from the very vessels that bring visitors to marvel at their creatures. Hundreds of small tourist boats move people between islands each year, creating an efficient—and efficient at spreading—network. While tourism is vital to local economies, these vessels also carry hitchhikers: invasive marine species that, once introduced, can devastate native ecosystems across the archipelago with breathtaking speed.
Campbell's team, publishing their findings in iScience, took a radically practical approach. Rather than imagining an unworkable blanket ban on vessel movement, they mapped where the real risk lived. Using social network modeling combined with sea-surface temperature data, they identified the specific routes most likely to transport invasive species between islands. The insight was elegant: not all connections between islands are equal.
"We propose zoning island routes into 'neighborhoods' based on geography and sea-surface temperature similarity," Campbell explained. The system works like a smart quarantine. Tourist vessels would operate within designated neighborhoods rather than moving freely across the entire archipelago. If invasive pests thrive in warm-water zones, they don't jump to cold-water islands. Geography becomes a firewall.
What makes this approach remarkable is what happens when something goes wrong—which, in conservation, it eventually will. Co-author Dr. Chi Le detailed the contingency: if an invasive species is detected, cross-neighborhood travel can be temporarily paused while tourism within that neighborhood continues. The archipelago doesn't shut down. The economy doesn't collapse. Only the affected zone is isolated, contained, cleaned.
"You can have both," Le said. "Tourism can still thrive, and we can prevent the spread of introduced species."
This matters far beyond the Galápagos. Island regions everywhere—from Hawaii to Antarctica—face identical threats. The ocean is connected, making island ecosystems uniquely vulnerable to cascading invasions. Yet Campbell's team has demonstrated that mathematical modeling and environmental data can turn that connectivity into strategic advantage rather than guaranteed disaster.
The research represents a shift in how we think about biosecurity in interconnected systems. Instead of viewing marine protection as fundamentally at odds with human use, Campbell's method shows how a straightforward, data-driven approach can isolate problems before they metastasize. It's not about choosing between conservation and community—it's about being smart enough to protect both.
"It's essentially a quarantine and shipping action plan," Campbell said. "You may never need it, but if something happens, having this plan in place means you can respond quickly and effectively."
For the Galápagos—and for every other island community facing similar pressures—that's a plan worth having in place.