Scientists identify 66 alien species that pose greatest threat to European biodiversity Naftali Hirschl, PhD. Allgemein, Investment & Nachhaltigkeit 13.12.2018 2 Minutes From an initial working list of 329 alien species considered to pose threats to biodiversity recently published by the EU, scientists have derived and agreed a list of eight species considered to be very high risk, 40 considered to be high ... Please register here, or login below. Username or E-mail Password Remember Me Forgot Password Published by Naftali Hirschl, PhD. View all posts by Naftali Hirschl, PhD. Published 13.12.2018