Definitions provided to our expert surveyors, 
to be used in classifying species on the survey

Major pest (The species has substantial effects on native ecosystems or on native populations OR the species has substantial economic effects in managed ecosystems); 

Minor pest (The species may have some effects on native ecosystems or populations, but the effects where they occur are relatively minor OR the economic impacts of this species are present but minor); 

Not a pest (The species does not seem to have measureable negative impacts on native ecosystems or populations where it occurs OR the economic impacts of this species are negligible).

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