Modeling the distribution of Norway rats (Rattus norvegicus) on offshore islands in the Falkland Islands

摘要: Abstract Non-native rats ( Rattus spp. ) threaten native island species worldwide. Efforts to eradicate them from islands have increased in frequency and become more ambitious recent years. However, the long-term success of some eradication efforts has been compromised by ability rats, particularly Norway norvegicus which are good swimmers, recolonize following eradications. In Falkland Islands, an archipelago South Atlantic Ocean, distance 250 m between (once sug-gested as minimum separation for effective barrier recolonization) shown be in-sufficient. present on about half 503 Falklands. Bird diversity is lower with two vulnerable passerine species, Troglodytes cobbi (the only endemic Islands passerine) Cinclodes antarcticus , greatly reduced abundances and/or absent rats. We used logistic regression models investigate potential factors that may determine presence 158 Islands. Our included area, nearest rat-infested island, location, history use humans driving vari-ables. Models best supported data source but relative magnitude effect area varied depending whether were eastern or western sector archipelago. The human was not a significant parameter any models. A very large fraction (72%) within 500 rat had 97% farther than 1,000 away sources free