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   Rattus norvegicus (mammal)
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    Details of this species in Gunner's Quoin Is.
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Eradicated
    Source: Island Conservation and Ecology Group, 2004; Bax et al. 2002
    Arrival Date:
    Species Notes for this Location:
    Management Notes for this Location:
    Rattus norvegicus was eradicated from Gunner's Quoin in 1995, in a programme undertaken by Wildlife Management International Ltd (led by Brian Bell). The eradication was achieved using hand broadcast of brodifacoum (20ppm) and bromadiolone (50ppm) over a one year period (Bell, 2002; A. Khadun, pers. comm.). Although the usual grid size for Norway rat eradications is 100 m, a 25 m grid was used, enabling the rat to gain access to bait more quickly and therefore reducing the overall time of the programme. The bait was lain on the ground rather than placed in bait stations; this is practical only if the weather and soil are dry, and there are no important non-target species. Since eradication, vegetation has responded well, numbers of skinks (Scelotes bojeri and Cryptoblepharus boutonii have appeared to increase, and the night gecko (see Nactus coindemirensis in IUCN Red List of Threatened Species) has been rediscovered. Monitoring has recorded strong seedling growth of Dracaena concinna, Latania loddigesii and Pandanus vandermeerschii (Bell, 2002).
    Location Notes:
    The vegetation of Gunner's Quoin (65 ha) is primarily forested and low thorn scrub (Bell, 2002).
    Last Modified: 21/08/2006 10:44:31 a.m.

ISSG Landcare Research NBII IUCN University of Auckland