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   Rattus norvegicus (mammal)
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    Details of this species in Campbell Is./Motu Ihupuku (sub-Antarctic)
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Eradicated
    Source: McClelland et al. 2002
    Arrival Date:
    Introduction:
    Species Notes for this Location:
    Norway rats have been present on Campbell Island for almost 200 years. In this time they, along with feral cats (Felis catus), have caused several bird species to survive only on the small rat-free islands around the coast, and have probably caused the extinction of other undiscovered species.
    Management Notes for this Location:
    Campbell Island is the largest island so far in which an attempt is to be made to eradicate Norway rats using aerial bait drops. In contrast to previous eradications which consist of two bait drops totalling 12kg/ha, Campbell Island will receive a single drop totalling 6kg/ha, but with a 50% overlap to eliminate the risk of gaps. This technique was tested in 1999 over a 600ha field trial carried out on the island. All rats in the baited area ate the bait and would have been killed. Non-target issues are minimal. The drop was to be carried out in July-September 2001, and only one attempt will be made.

    Norway rats were eradicated from Campbell Island following aerial applications of brodifacoum, thirty days apart in 2001(J. Russell, pers. comm.; P. McLelland, pers. comm.). Eradication was confirmed in 2003.

    Impacts:
    Predation: It is probable that Norway rats have caused catastrophic declines in the numbers of ground-nesting birds, but no particular case has been properly documented (SPREP, 2000).
    Last Modified: 28/08/2006 2:44:26 p.m.


ISSG Landcare Research NBII IUCN University of Auckland