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   Rattus exulans (mammal)
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    Details of this species in Tiritiri Matangi Is.
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Eradicated
    Source: Veitch, 2002b
    Arrival Date:
    Species Notes for this Location:
    Pacific rats (Rattus exulans) were present on Tiritiri Matangi Island at the time of the first European records.
    Management Notes for this Location:
    Pacific rats were eradicated from Tiritiri Matangi Island in September 1993, using an aerial application of Talon 20P pellets containing brodifacoum. During the bait drop, endangered non-target species such as the North Island takahe (see Porphyrio mantelli in IUCN Red List of Threatened Species) and brown teal or the Auckland Island teal (see Anas aucklandica in IUCN Red List of Threatened Species) were kept in an enclosure. There were some non-target effects on other species such as pukeko (Porphyrio melanotus), but since the eradication these populations have recovered to pre-eradication levels. No rodent sign has been detected since the eradication. 51 Rentokil bait stations containing bromadiolone bait are maintained on the island at potential landing places (Veitch, 2002).
    Since the eradication, there has been a general increase in native bird numbers and an increase in the abundance of ripe fruits and seeds which were previously eaten by rats (Graham and Veitch., 2002). Monitoring carried out post-eradication showed an increase in invertebrate species, especially larger species such as ground weta (Orthoptera: Anostostomatidae) and several species of prowling spider (Araneae: Miturgidae) (Green, 2002).
    Location Notes:
    Tiritiri Matangi Island (220 ha) lies 4 km off the Whangaparaoa Peninsula north of Auckland, New Zealand. It is a Scientific Reserve which is open to the public. It was grazed by domestic animals from 1841 until 1971. Rabbits were plentiful at one time, but had disappeared by 1908. In 1979, a native planting programme was initiated (Graham and Veitch., 2002).
    Last Modified: 18/08/2006 12:47:23 p.m.

ISSG Landcare Research NBII IUCN University of Auckland