Listing of invasive alien species associated with 10 forms of uncertainty!

Populating the pressure indicator for invasive alien species in other words ‘number of invasive alien species per country’ (see McGeoch et al. 2010) is dependent on the availability of high quality lists of invasive alien species for a range of taxonomic group, countries and regions. The listing of invasive alien species is prone to a wide range of both avoidable and unavoidable errors. McGeoch et al. (2012) review and assess the implications of these errors. They provide a set of recommendations for improving the comparability, standardization and transparency of invasive alien species listing for the purpose of, inter alia, improving the robustness of indicator outcomes.

Source: McGeoch, M.A., Spear, D., Kleynhans, E.J. & Marais, E. (2012). Uncertainty in invasive alien species listing. Ecological Applications. Preprint available at: doi:

[ Indicator in action list ]