Table 2.

Proposed factors for insular susceptibility to invasions and their applications in the Azorean archipelago [109,114].

Islands in General	Azores Islands
Reduced competitive ability	Lack of predators/enemies in Azorean native biota
Relative lack of species diversity	Poor diversity in Azorean native flora and fauna.
Lack of coevolved species	Lack of closely related species in Azorean flora
Relative lack of natural disturbance, such as forest fires	Temperate, humid climate, allowing invasion from species with very different tolerances.
Intensive human disturbance	Exotic species as ornaments in parks and gardens; intense pasture and maize production, hosting several insect pests.