Antarctica’s ecosystems could be threatened by the arrival of non-native marine species and marine pollution from Southern Hemisphere landmasses, new oceanographic modelling shows. Previously, scientists thought non-native species only drifted from remote and unpopulated islands in the Southern Ocean. New research, published in Global Change Biology on Thursday, suggested they could reach the Antarctic coastline from all southern continents. Non-native species can reach Antarctica by catching a ride on floating objects like kelp, driftwood, pumice and plastic, scientists said. Co-author Crid F…