Towards Ethical and Effective Conservation of New Zealand’s Natural Heritage
Abstract
1. Introduction
2. Background
2.1. Natural History
2.2. Human Arrival
2.3. Aerial Control of Mammals
2.4. The Aerial Poisons
3. Oversight of Aerial Poisoning
3.1. The Department of Conservation
3.2. The Reassessment of 1080 by the Environmental Risk Management Authority
3.3. Report on 1080 by the Parliamentary Commissioner for the Environment, 2011
4. Poisoning of Native Species
4.1. 1080
4.2. Brodifacoum
5. Unwanted Ecological Outcomes
6. Animal Welfare Impact
7. The DOC’s Reasons for Aerial Poisoning
7.1. Masting
- The aerial poisoning method of control is likely to result in escalation in the population sizes of mice, rats and possibly stoats (see above), which is the scenario that the poisoning is intended to avert;
- Bird productivity has been observed to increase following masting and such increases may offset any increased predation [67];
- Fears that a mast-driven stoat plague would devastate birds in the Murchison Mountains turned out to be unfounded—when the food supply (mice) crashed, stoats shifted to eating ground weta (Hemiandrus spp.) rather than birds [148];
- In poisoning deaths, or if reproduction is harmed through sub-lethal exposure, genetic material (along with the potential to adapt, e.g., to predation pressure [128]), is lost from endemic populations;
- An analysis of ship rat, mouse and mustelid tracking between 2005 and 2022 indicated that historic aerial management operations had magnified ship rat irruptions in subsequent mast seeding events in pure and mixed beech forests [106] (p. 44);
- Annual reports on mast-based management in the Eglinton Valley in Fiordland since 2016 onwards show aerial poisoning has been supplementary to ground based poisoning and trapping. Recent outcomes have included the need for additional “inter-mast” aerial poisoning; high peaks in numbers of stoats; a substantial presence of rats, mice and weasels; poorly controlled cats; and the prized mohua (Mohoua ochrocephala) bird population just holding on following multiple, substantial population top-ups with birds translocated from elsewhere [61] (p. 12a, plus annual reports 2016 onwards).
7.2. Predation
- Stomach contents analysis of nearly 1900 possums from five studies showed a largely vegetarian diet topped up with invertebrates and no vertebrate remains. A subsequent study of 43 possums found remains of a greenfinch in one stomach [149];
- Kokako nests were videoed under infrared light, and actual predation by the possums attracted to the nests was barely observed [154];
- Short-tailed bats were considered relatively safe from predators, being fast and agile, fiercely mobbing intruders and choosing winter roosts that were inaccessible [155].
7.3. Ineffective Ground-Based Management
7.4. Eradication
- “Unintended consequences may include the eruption of unwanted herbivores and competing predators … and invertebrate biodiversity declines. Some effects will be unexpected and may be unrecoverable” (Linklater & Steer, 2018) [139] (p. 2);
- “Focusing management on just one driver of biodiversity loss not only ignores the effects of other pressures but also increases the likelihood of perverse outcomes such as favouring small subsets of indigenous taxa at the expense of or facilitating ecological release of other, potentially more damaging, invasive mammals” (Leathwick & Byrom, 2023) [55] p. 6);
- “It is difficult to assess the ecological risk of meso-predator release of ship rats (following possum, mustelid, or cat control) or mice (following ship rat, mustelid, or cat control) because it depends on food availability. There is a lack of understanding of net outcomes of these interactions for indigenous species, making it difficult to assign ecological risk from the removal of a given pest species or a sub-set of species present in an area” (Norbury et al., 2024) [165] (p. v).
8. Discussion on Careful Management
8.1. Need for Change
8.2. Habitat Preservation
8.3. Ecological Knowledge
8.4. Monitoring
8.5. Ground-Based Control
8.6. Animal Welfare
8.7. Governance
9. Conclusions
Supplementary Materials
Funding
Acknowledgments
Conflicts of Interest
References
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Common Name | latin Name | Date Established in NZ * |
---|---|---|
Pacific rat (kiore) 1 | Rattus exulans | 1280 |
Feral cat 2 | Felis catus | 1769 |
Norway rat | Rattus norvegicus | Late 1700s |
House mouse 3 | Mus musculus | By 1824 |
Hedgehog 2 | Erinaceus europaeus occidentalis | Late 1800s |
Brushtail possum | Trichosurus vulpecula | 1858 |
Ship rat | Rattus rattus | By late 1800s |
Ferret | Mustela furo | 1870s |
Weasel | Mustela nivalis vulgaris | 1883 |
Stoat | Mustela erminea | 1883 |
Effect | Page No. [25] | Wording |
---|---|---|
Adsorption/desorption in a range of soils | 349 | “Data gap” |
Reproductive toxicity to birds | 349 | “Data gap” |
Toxicity to frogs | 723 | “The Agency has made no assessment of risks to frogs” |
Toxicity to algae | 349 | “Data gap” |
Toxicity to aquatic invertebrates | 349 | “Data gap” |
Chronic aquatic toxicity | 349 | “Data gap” |
Biodegradation in aquatic systems and soils at varying pH, soil type and temperature | 349 | “Data gap” |
Toxicity to terrestrial invertebrates | 350 | “Data gap” |
Toxicity of the breakdown product fluorocitrate in water or soil | 360 | “The applicants did not provide, and the Agency was not able to locate, any data …” |
Toxicity to native NZ reptiles | 416 | “No data are available …” |
Adsorption/desorption or leaching of 1080 | 349 | “No standard guideline studies … were submitted … or located by the Agency” |
Reversibility of effects on the male reproductive system | 294 | “data on 1080 that would be desirable” |
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Pollard, J.C. Towards Ethical and Effective Conservation of New Zealand’s Natural Heritage. Conservation 2025, 5, 47. https://doi.org/10.3390/conservation5030047
Pollard JC. Towards Ethical and Effective Conservation of New Zealand’s Natural Heritage. Conservation. 2025; 5(3):47. https://doi.org/10.3390/conservation5030047
Chicago/Turabian StylePollard, Joanna C. 2025. "Towards Ethical and Effective Conservation of New Zealand’s Natural Heritage" Conservation 5, no. 3: 47. https://doi.org/10.3390/conservation5030047
APA StylePollard, J. C. (2025). Towards Ethical and Effective Conservation of New Zealand’s Natural Heritage. Conservation, 5(3), 47. https://doi.org/10.3390/conservation5030047