Aliens by Group
One of the great values of an inventory such as DAISIE is the ability to identify major patterns in the alien species of Europe. A series of graphical summaries of the DAISIE database are presented here, and can be explored using the menu items to the left.
The graph below shows the number of species, for each environmental group, which have been classified as alien in (some part of) Europe.
Aliens by Country
The graphs below show the number of species classified as alien for each country. A separate graph is provided for each environmental group.
Aliens by Country (Aquatic Marine)
Aliens by Country (Aquatic Inland)
Aliens by Country (Terrestrial Invertebrates)
Aliens by Country (Terrestrial Vertebrates)
Aliens by Country (Terrestrial Plants)
Aliens by Country (Terrestrial Fungi)
Pathways
The graphs below show the number of alien species associated with particular pathways of introduction. A separate graph is provided for each environmental group. Note that some species are associated with more than one pathway; the sum of the number of species per pathway does not equal the total number of species in that environmental group.
Pathways of introduction are defined as follows:
| Unknown | Pathway not known. |
| Aquaculture | Introduced in aquaculture, mariculture |
| Canals | Introduced through canals |
| Fisheries | Fisheries & stock movement as fish food; dispersal via fishing gear |
| Vessels | Floating structures, ballast water and/or sediments in tanks, dispersal via shipping |
| Leisure | Leisure activities |
| Escapes | Animals, plants and their pests that escaped from captivity, laboratories, farms |
| Ornamental | Live food trade, animals and plants used for ornamental purposes in parks, gardening, bonsai, etc.. |
| Biocontrol | Introduced as biological control agent or pest of another species |
| Agriculture | Introduced through agriculture |
| Vessel hull fouling | Hull fouling of ships, vessels and barges |
| Vessel ballast | Ballast water and/or sediments in tanks |
| Forestry | Introduced for timber or re-(a)forestation on a forestry scale |
| Other transport | Dispersal via transport (terrestrial) |
| Other | Other. More details provided with individual records. |
Pathways (Aquatic Marine)
Pathways (Aquatic Inland)
Pathways (Terrestrial Invertebrates)
Pathways (Terrestrial Vertebrates)
Pathways (Terrestrial Plants)
Pathways (Terrestrial Fungi)
Vectors
The graphs below show the number of alien species associated with particular vectors of introduction. A separate graph is provided for each environmental group. Note that some species are associated with more than one vector; the sum of the number of species per vector does not equal the total number of species in that environmental group.
Vectors (Aquatic Marine)
Vectors (Aquatic Inland)
Vectors (Terrestrial Invertebrates)
Vectors (Terrestrial Vertebrates)
Vectors (Terrestrial Plants)
Vectors (Terrestrial Fungi)
