The Ministry of Environment through the Directorate of the Galápagos National Park (Dirección del Parque Nacional Galápagos - DPNG) together with the NGO Island Conservation started eradicating invasive rodents from North Seymour Island and the Mosquera Islet in January 2019. These islands are important tourism and seabird nesting sites for species such as frigate birds and swallow-tailed gulls, which are the only nocturnal gull on the planet. For more information see the IDTechEx report on Drones 2018-2038.
Monitoring activities in early 2018 determined that North Seymour was infested by black (Rattus rattus) and brown rats (Rattus norvegicus). DPNG immediately began managing the project's development after declaring a state of emergency, which secured funds from the Fund for Sustainable Environmental Investments (FIAS).
Bell Laboratories produced 3,000 kilograms of rodenticide for the eradication. The bait's formula was designed especially for projects within the Galápagos Archipelago due to their unique weather conditions.
The Guadalupe River (DPNG's boat) was used as base camp for the project. Over 30 park rangers were equipped with masks, goggles, and protective clothing to manually disperse the bait on 48% of North Seymour's 184 ha and the 5 ha of the Mosquera Islet, adjacent to the island.
With the support of Island Conservation and New Zealand's Environment and Conservation Technologies LTD., a pilot project was implemented using drones and hoppers with applicators designed in 3D printers. 52% coverage of North Seymour Island was possible using this equipment, making it the world's first use of drones to remove invasive vertebrates.
"The use of drones is more precise; it also increases feasibility, and reduces eradication costs of invasive rodents in small and midsize islands worldwide," said Karl Campbell, Island Conservation South American Regional Director.
Prior to the application, tests and measurements were carried out to guarantee correct bait dispersion on the targeted area. Afterwards, park rangers proceeded with follow-up monitoring to verify the expected coverage in the established transects and bait consumption by the rodents.
Jorge Carrión, Director of Galápagos National Park, specified that a second application and monitoring will take place by the end of January to eliminate any remaining rodents.
The eradication of introduced species required that North Seymour Island be temporarily closed for visits from January 8 to February 8. After reopening, the site will have informative signs for visitors.
Christian Sevilla, a park ranger, said that first phase of the project will take place until the end of January, but the ecological monitoring will continue for the next two years. This is the time needed to declare the island rodent-free and have evidence of the recovery of the ecosystem, monitoring the proliferation of cacti and other species.
Source and top image: Island Conservation
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