Conclusions/Significance: This extensive survey has increased the known alien vascular flora of Galapagos by 257 species, giving a ratio of alien to native taxa of 1.57:1. It provides a crucial baseline for plant invasion management in the archipelago and contributes data for meta analyses of invasion processes worldwide. A repeat of the survey in the future would act as an effective early detection tool to help avoid further invasion of the Galapagos National Park.
Competing Interests: The authors have declared that no competing interests exist.
Funding: This work was accomplished with the support of Project ECU/00/G31 ''Control of Invasive Species in the Galapagos Archipelago'', a donation from the Global Environment Facility (GEF) to the Ecuadorian Government, represented by the Ministry of Environment. The Project was implemented by the United Nations Development Programme (UNDP) and was executed by the Galapagos National Park Service (GNPS), Charles Darwin Foundation (CDF), National Institute for Galapagos (INGALA) and Ecuadorian Service for Agriculture and Livestock Sanitation - Galapagos (SESA-Galapagos). Additional financial support was provided by TAME Airlines, Galapagos Conservation Trust and Galapagos Conservancy. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. SWCA is included in the article because it relates to Christopher Buddenhagen's current place of employment, but SWCA did not fund any of the work and does not have any relation with the submitted article. C. Buddenhagen was employed by the Charles Darwin Foundation at
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