Changes in the six main pathway categories (as well as the number of introductions via unknown pathways) a the documented number of introduction events (n = 18746) of alien species per decade since 1800 for 101 countries b–c cumulative number of documented introduction events by pathway since 1970 (note different scaling on y-axes).

  Part of: McGrannachan CM, Pagad S, McGeoch MA (2021) A multiregional assessment of transnational pathways of introduction. NeoBiota 64: 43-67.