Action: Control predators not on islands for parrots
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A replicated, controlled trial in New Zealand found increased kaka Nestor meridionalis nesting success and lower predation at sites with mammal predator removal than at unmanaged sites.
Supporting evidence from individual studies
A replicated, controlled trial in New Zealand (Moorhouse et al. 2003) found that the nesting success of kakas Nestor meridionalis was significantly higher at three sites with control (80–87% of 70 nests successful) than at three unmanaged sites (10–38% of 43 nests). Predation rate of nesting females was also significantly lower at sites with predator control (5% of 38 tracked females vs. 65% of 17). Stoats Mustela erminea, common brushtail possums Trichosurus vulpecula and rats Rattus spp. were controlled with trapping and poisoning with 1080 sodium monofluoroacetate and anticoagulents. Data comes from 1996-2000 for five sites and 1984-1996 for one (unmanaged) site.
- Moorhouse R., Greene T., Dilks P., Powlesland R., Moran L., Taylor G., Jones A., Knegtmans J., Wills D., Pryde M., Fraser I., August A. & August C. (2003) Control of introduced mammalian predators improves kaka Nestor meridionalis breeding success: reversing the decline of a threatened New Zealand parrot. Biological Conservation, 110, 33-44