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Review
. 2024 Jan;19(1):8-26.
doi: 10.1111/1749-4877.12719. Epub 2023 Apr 12.

Rodent management in Aotearoa New Zealand: approaches and challenges to landscape-scale control

John G Innes  1 , Grant Norbury  2 , Araceli Samaniego  3 , Susan Walker  4 , Deborah J Wilson  4
Affiliations
Review

Rodent management in Aotearoa New Zealand: approaches and challenges to landscape-scale control

John G Innes et al. Integr Zool. 2024 Jan.

Abstract

Aotearoa-New Zealand has only four rodent species, all introduced. In order of arrival, they are Pacific rat Rattus exulans, brown rat R. norvegicus, house mouse Mus musculus, and black rat R. rattus. Rodent management in New Zealand aims mainly to conserve indigenous biodiversity rather than to protect crops or manage diseases, as is usual elsewhere. We describe four major "regimes" and one major vision for rodent control in New Zealand to meet ecological restoration objectives. Current challenges for island eradications are for large islands that are remote or populated by people. Aerial 1080 is the only large-scale (tens of thousands of hectares) option for black rat control, but its application requires adjustment to counter subsequent rapid black rat repopulation. Unfenced "ecosanctuaries" (mean 720 ha) use ground-based traps and poisons to target mainly black rats and face constant reinvasion. Ecosanctuaries with mammal-resistant fences (up to 3500 ha) limit reinvasion and target more pest species and have enabled the return of previously extirpated taxa to the main islands. Predator Free 2050 aims to eradicate the rat species (but not mice) plus some other introduced mammals from New Zealand by 2050. This vision is not attainable with current tools, but research and experimental management is exploring techniques and technologies. The large scale (to 100 000 ha) at which black rats are now targeted for control to extremely low abundance seems to be unique to New Zealand.

Keywords: black rat; brown rat; eradication; house mouse; rodent control.

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References

REFERENCES

    1. Armstrong DP, Raeburn EH, Lewis RM, Ravine D (2006). Estimating the viability of a reintroduced New Zealand robin population as a function of predator control. The Journal of Wildlife Management 70, 1020-7.
    1. Atkinson IAE (1978). Evidence for effects of rodents on the vertebrate wildlife of New Zealand islands. In: Dingwall PR, Atkinson IAE, Hay C, eds. The Ecology and Control of Rodents in New Zealand Nature Reserves. Information Series 4. Department of Lands and Survey, Wellington, New Zealand, pp. 7-30.
    1. Baber M, Brejaart R, Babbitt K, Lovegrove T, Ussher G (2009). Response of non-target native birds to mammalian pest control for kokako (Callaeas cinerea) in the Hunua Ranges. Notornis 56, 176-82.
    1. Baker SE, Ayers M, Beasoleil NJ et al. (2022). An assessment of animal welfare impacts in wild Norway rat (Rattus norvegicus) management. Animal Welfare 31, 51-68.
    1. Bell EA, Bell BD, Merton DV (2016). The legacy of Big South Cape: Rat irruption to rat eradication. New Zealand Journal of Ecology 40, 212-8.

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