Status: Alien Invasiveness: Invasive Occurrence: Eradicated Source: Island Conservation and Ecology Group, 2004
Arrival Date: early 1900s Introduction:
Species Notes for this Location: Guano miners introduced rats and mice to Rasa Island at the turn of the century (Donlan et al., 2000).
Management Notes for this Location: An attempt was made to eradicate Rattus norvegicus from Rasa Island (60 ha) in 1994, in a programme undertaken by Island Conservation and Instituto Nacional de Ecologia (led by Jesus Ramirez). The methods used were brodifacoum (50ppm, wax blocks) bait stations and trapping on a 25 x 25m grid over a one year period (J. Ramirez, pers. comm.; Tershy et al. 2002).
Impacts: Reduction in native biodiversity: Rats and mice may be responsible for the absence of nocturnal hole and crevice nesting birds on Rasa Island (Donlan et al., 2000).