Status: Alien Invasiveness: Invasive Occurrence: Eradicated Source: Island Conservation and Ecology Group, 2004
Arrival Date: Introduction:
Species Notes for this Location:
Management Notes for this Location: Rattus norvegicus was eradicated from Langara Island in 1995. The eradication was achieved using brodifacoum (50ppm) bait stations over a two year period (Kaiser et al. 1997). The island was divided into five units. 4000 bait stations were used, and the whole island was poisoned simultaneously. Eradication was essentially achieved in less than four weeks (Thomas and Taylor, 2002). The population of ancient murrelets (see Synthliboramphus antiquus in IUCN Red List of Threatened Species) has since been reported to be increasing (Drever, 2000).
Location Notes: The vegetation of Langara Island (3105 ha) is primarily forested. Langara Island once had one of the largest seabird colonies of British Columbia, but over a period of 30-40 years, these were exterminated or reduced by Norway rats (Thomas and Taylor, 2002).
Impacts: Reduction in native biodiversity: Rattus norvegicus is implicated in the extirpation or decline of previously large seabird populations on Langara Island (Howald et al., 1999).