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Reducing Wildlife Damage with Cost-Effective Management Programmes.

Cheryl R Krull¹, Margaret C Stanley², Bruce R Burns²

¹Institute for Applied Ecology New Zealand, AUT University, Auckland, New Zealand.

|January 16, 2016

Summary

Effective wildlife damage control, like managing wild pigs, requires understanding how reducing animal density impacts damage. This study shows control significantly reduces ground disturbance, but higher investment yields diminishing returns.

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Area of Science:

Ecology
Conservation Biology
Wildlife Management

Background:

Wildlife damage management often lacks clear links between control efforts, animal abundance, and damage levels.
Ground disturbance by wild pigs is a significant ecological concern globally, affecting vegetation, soil, and habitats.

Purpose of the Study:

To evaluate the effects of a wild pig control program on pig abundance, ground disturbance, and recovery rates.
To assess the cost-effectiveness of different control strategies in a temperate rainforest ecosystem.
To develop a model linking control inputs to wildlife damage reduction and conservation outcomes.

Main Methods:

A 3-year ground hunting program was implemented to control wild pig populations.
Pig abundance, rates of new ground disturbance, and ground disturbance recovery were monitored.
Stochastic simulation models were used to analyze control effectiveness and cost-benefit.

Main Results:

Wild pig control reduced densities by over one-third and halved average ground disturbance.
New ground disturbance increased with higher pig densities; recovery rates were density-independent.
Simulations indicated substantial disturbance reduction, but diminishing returns with intensified control efforts.

Conclusions:

Wildlife control can effectively reduce ecological damage, but cost-effectiveness decreases with higher investment.
Managers must weigh the marginal costs of increased control against the marginal conservation benefits.
The study provides a framework for linking conservation actions to wildlife damage reduction.