Measuring uncertainty of marine alien species: the case of marine alien amphipods worldwide

The present work aims to address the uncertainty regarding marine alien species, by investigating the available knowledge on the taxon of amphipods (Crustacea Peracarida). The main objectives of this study are: i) to develop an inventory of marine alien amphipods worldwide; ii) to discriminate amphipod species with convincing valid alien status from species affected by uncertainty; and iii) to identify and assess the different types of uncertainty that are affecting marine alien amphipods