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   Rattus exulans (mammal)
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    Details of this species in Nu’ulua
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Established
    Source: The Pacific Invasives Initiative 2006c
    Arrival Date:
    Species Notes for this Location:
    Pacific rats (Rattus exulans) have been found on Nu’utele since 1991 and Nu’ulua since 2003.
    Management Notes for this Location:
    Both Nu’utele and Nu’ulua have steep terrain which makes manual baiting for rats difficult and dangerous. There has been a proposal to carry out an aerial drop of grain-based baits containing the brodifacoum on both islands with provision to ground-lay extra baits in any gaps and in high rat/crab density areas if required. A project plan is currently being developed by Dave Butler (David Butler Associates Ltd) in consultation with PII (Pacific Invasives Initiative) staff. Opportunities to combine rat and ant management are being considered.
    Location Notes:
    The islands of Nu’utele (covering 108 hectares) and Nu’ulua (covering 25 hectares) are part of the Aleipata Island group situated 1.3 kilometres from the eastern end of Upolu Island, Samoa, and have long been identified as key sites for conservation. They represent the only potentially secure offshore uninhabited islands in Samoa that could be used as a sanctuary for species whose survival is threatened by rats. The islands provide habitat for a number of other locally and regionally endemic birds including: tooth-billed pigeon (see Didunculus strigirostris in IUCN Red List of Threatened species), friendly ground dove (see Gallicolumba stairi in IUCN Red List of Threatened species) and the Samoan broadbill or Samoan flycatcher (see Myiagra albiventris in IUCN Red List of Threatened species). They also hold the largest seabird colonies in Samoa including: red footed and brown boobies (Sula sula and Sula leucogaster), black and white terns (Sterna sumatrana and Gygis alba) and frigate birds (Fregata minor). Other inhabitants includes the Coconut crab (see Birgus latro in IUCN Red List of Threatened species) and an endemic bat (Pteropus samoensis).
    Last Modified: 18/08/2006 2:30:46 p.m.

ISSG Landcare Research NBII IUCN University of Auckland