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Risk Management Assessment Improves the Cost-Effectiveness of Invasive Species Prioritisation.

Peter A Robertson¹, Aileen C Mill¹, Tim Adriaens²

¹Modelling, Evidence and Policy Group, Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.

|December 24, 2021

Summary

Prioritizing invasive alien species for management is crucial. Including management feasibility alongside risk assessment significantly improves cost-effectiveness, preventing inefficient resource allocation.

Keywords:

Aichi Target 9 Europe invasive alien species of Union Concern management cost management feasibility prioritisation risk assessment risk management

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Area of Science:

Ecology
Conservation Biology
Environmental Management

Background:

International agreements mandate control of invasive alien species, but resource limitations necessitate effective prioritization.
Species prioritization typically involves risk assessment (impact likelihood/scale) and risk management (feasibility, cost, effectiveness).
Risk assessment is common, but risk management is less utilized despite its importance in resource allocation.

Purpose of the Study:

To evaluate the cost-effectiveness of different invasive alien species prioritization strategies.
To compare prioritization based solely on risk assessment versus incorporating risk management factors.

Main Methods:

Analyzed 26 high-risk invasive species targeted for eradication in Great Britain.
Extracted risk assessment scores, eradication costs, and management feasibility data.
Calculated cost-effectiveness by comparing risk reduction per unit cost under different prioritization criteria.

Main Results:

Prioritization using only risk assessment scores was no more effective than random ranking.
Incorporating management feasibility into prioritization yielded nearly a two-order-of-magnitude improvement in cost-effectiveness.
Risk management assessment significantly enhanced the cost-effectiveness of species prioritization for action.

Conclusions:

Basing invasive species management priorities solely on risk assessment, without considering management feasibility, leads to inefficient use of limited resources.
Integrating risk management assessment into prioritization strategies is essential for maximizing the cost-effectiveness of invasive alien species control efforts.