Before / After human-mediated dispersal (IMAGE) University of Lausanne Caption The dispersal of 309 non-native ant species has had a major impact on the biogeographical patterns of all 13,774 ant species with known distributions, with the emergence of a single bioregion in the tropics consisting of similar species assemblages. © Lucie Aulus-Giacosa, DEE-UNIL Credit © Lucie Aulus-Giacosa, DEE-UNIL Usage Restrictions © Lucie Aulus-Giacosa, DEE-UNIL License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.