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For invasive pest control in New Zealand, using multiple single-capture traps may be more cost-effective than fewer multiple-capture traps, especially for brushtail possums, stoats, and rats at low densities.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Pest Management

Background:

  • Invasive vertebrate species, including brushtail possums, stoats, and ship rats in New Zealand, pose significant threats to biodiversity and agriculture.
  • Cost-effective, non-toxic pest control methods are in high demand.
  • Multiple-capture traps are promoted as more cost-effective than single-capture traps due to reduced checking frequency.

Purpose of the Study:

  • To evaluate the cost-effectiveness of single-capture versus multiple-capture traps for controlling invasive species in New Zealand.
  • To determine optimal trap deployment strategies based on pest densities and trap capacity.

Main Methods:

  • An individual-based, spatially explicit modeling approach was employed.
  • Simulations assessed trap performance under varying densities of possums, stoats, and rats.
  • Trap spacing followed best practice pest control guidelines.

Main Results:

  • For low-density possum populations (0.5/ha), single-capacity traps achieved 98% capture.
  • At moderate possum densities (3/ha), three-capacity traps captured 97%.
  • For rats, even six-capacity traps only achieved an 80% kill rate, indicating potential limitations.

Conclusions:

  • The most cost-effective pest control strategy in New Zealand may involve deploying multiple single-capture traps rather than fewer multiple-capture traps.
  • Trap strategy effectiveness depends on target species, population density, and immigration rates.